{"site":"https://terrabrain.vercel.app","updated":"2026-10-14","stats":{"articles":245,"answers":2291,"sources":390},"answers":[{"question":"Are cracks in a garage or house slab a foundation problem?","answer":"Most are concrete shrinkage and not structural; a crack matters when one side is higher, it keeps widening, or it lines up with signs like sloping floors.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks","section":"signs"},{"question":"Visible slab cracks: What does this sign look like?","answer":"Cracks show in the exposed concrete of a garage, porch or patio, or telegraph through floor coverings as cracked tile or a ridge under carpet. They may be hairline, open, or offset with one edge higher than the other.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#what-does-this-sign-look-like","section":"signs","topic":"Visible slab cracks"},{"question":"Why do concrete slabs crack?","answer":"Concrete shrinks as it cures and dries, by about 0.0002 to 0.0008 inch per inch. Over a 20-foot slab, that works out to roughly 0.05 to 0.19 inch of shortening, which is why slabs crack even when nothing is wrong with the soil.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#why-do-concrete-slabs-crack","section":"signs","topic":"Visible slab cracks"},{"question":"How is a slab crack read?","answer":"Engineering guidance notes that most concrete cracks do not compromise structural integrity, so their physical characteristics are evaluated rather than their presence alone.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#how-is-a-slab-crack-read","section":"signs","topic":"Visible slab cracks"},{"question":"Visible slab cracks: How is it documented?","answer":"Width and offset at several points along the crack; Change over time with a crack monitor; cyclical movement may take six months or more to measure; Floor elevation survey, the engineering step beyond a visual first impression. See elevation surveys.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#how-is-it-documented","section":"signs","topic":"Visible slab cracks"},{"question":"Are cracks in a concrete slab normal?","answer":"Many are. Concrete shrinks as it dries, and engineering guidance notes that most slab cracks do not compromise structural integrity. Their physical characteristics, such as offset, pattern and whether they are growing, are what get evaluated.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#faq-1","section":"signs","topic":"Visible slab cracks"},{"question":"What does it mean if one side of a slab crack is higher than the other?","answer":"An offset means the concrete on one side has moved up or down relative to the other. That points to soil movement, settlement or heave under the slab rather than simple drying shrinkage.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#faq-2","section":"signs","topic":"Visible slab cracks"},{"question":"Can slab cracks be repaired by injection?","answer":"Engineering repair guidance describes epoxy injection for cracks of about 1/32 inch and wider. Injection restores the crack but does not address soil movement that caused it.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#faq-3","section":"signs","topic":"Visible slab cracks"},{"question":"Are post-tensioned slabs different?","answer":"Yes. Post-tensioned slabs contain steel tendons stretched tight after the concrete hardens to hold the slab in compression. Design guidance calls for a minimum residual average prestress of 100 psi and continuous post-tensioned beams.","url":"https://terrabrain.vercel.app/signs/visible-slab-cracks#faq-4","section":"signs","topic":"Visible slab cracks"},{"question":"Are drywall nail pops and tape joint cracks a foundation problem?","answer":"Usually not. They are most often caused by wood framing drying and shrinking, and point to the foundation only when other signs line up.","url":"https://terrabrain.vercel.app/signs/nail-pops-and-tape-joint-cracks","section":"signs"},{"question":"What do nail pops and tape cracks look like?","answer":"Nail pops: small circles or bumps over fasteners, often in rows along a stud or ceiling joist; Tape-joint cracks: straight, thin cracks that follow the seams between drywall sheets, often at ceiling lines or inside corners.","url":"https://terrabrain.vercel.app/signs/nail-pops-and-tape-joint-cracks#what-do-nail-pops-and-tape-cracks-look-like","section":"signs","topic":"Nail pops and tape cracks"},{"question":"Nail pops and tape cracks: Why do they happen?","answer":"Lumber loses moisture after a house is built and as heating and cooling dry the air. Brick industry data put wood shrinkage at about 0.0025 inch per inch for each 1 percent change in moisture content, which works out to roughly 1 percent shrinkage for every 4 percent drop.","url":"https://terrabrain.vercel.app/signs/nail-pops-and-tape-joint-cracks#why-do-they-happen","section":"signs","topic":"Nail pops and tape cracks"},{"question":"Nail pops and tape cracks: How are they documented?","answer":"Map where the pops and cracks are on a floor plan and compare that pattern with a floor elevation survey. Engineering guidance treats a relative elevation survey as the step beyond a visual first impression.","url":"https://terrabrain.vercel.app/signs/nail-pops-and-tape-joint-cracks#how-are-they-documented","section":"signs","topic":"Nail pops and tape cracks"},{"question":"Do nail pops mean my foundation is moving?","answer":"Usually not on their own. A federal housing guide lists nail pops and visible seams among reported wallboard problems, and wood framing shrinks as it dries, which can push fasteners and joints. They point toward foundation movement only when they come with other signs such as sloping floors or diagonal cracks at openings.","url":"https://terrabrain.vercel.app/signs/nail-pops-and-tape-joint-cracks#faq-1","section":"signs","topic":"Nail pops and tape cracks"},{"question":"Nail pops and tape cracks: How much does wood framing shrink?","answer":"Brick industry data put wood shrinkage at about 0.25 percent of dimension for each 1 percent drop in moisture content, or roughly 1 percent for every 4 percent drop.","url":"https://terrabrain.vercel.app/signs/nail-pops-and-tape-joint-cracks#faq-2","section":"signs","topic":"Nail pops and tape cracks"},{"question":"What drywall cracks are linked to foundation movement?","answer":"Engineering guidance lists cracking of gypsum board walls and ceilings, separation of walls from ceilings, and racked door and window frames as distress indicators, usually read together with a floor elevation survey.","url":"https://terrabrain.vercel.app/signs/nail-pops-and-tape-joint-cracks#faq-3","section":"signs","topic":"Nail pops and tape cracks"},{"question":"Are sticking windows or cracked glass a foundation sign?","answer":"They are possible signs of foundation movement but do not identify a cause alone. The whole-house pattern and an elevation survey separate it from other causes.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass","section":"signs"},{"question":"Sticking windows, cracked glass: What does this sign look like?","answer":"A sash that rubs, binds or needs force to open or close; A lock or latch that no longer lines up with its keeper; An uneven gap between the sash and the frame, wider at one corner than the other.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#what-does-this-sign-look-like","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Why does foundation movement show up at windows?","answer":"The InterNACHI Standards of Practice require home inspectors to report signs of possible foundation movement, and name cracked drywall, cracked brick, out-of-square door frames and floors that are not level as examples.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#why-does-foundation-movement-show-up-at-windows","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Sticking windows, cracked glass: What moves foundations in Oklahoma clay?","answer":"The trade word for soil that grows when wet and shrinks when dry is expansive clay (also called shrink-swell clay).","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#what-moves-foundations-in-oklahoma-clay","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Sticking windows, cracked glass: How is it documented?","answer":"Each affected window: wall, floor level, which side binds, and the date; Whether the same window changes between wet and dry months, since clay moisture follows the seasons; Nearby signs: diagonal drywall cracks at openings, brick separating from the window frame, floor slope.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#how-is-it-documented","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Can sticking windows mean I have a foundation problem?","answer":"They can. InterNACHI's inspection standards list out-of-square door frames among signs of possible foundation movement, and its foundation guidance lists sticking doors or windows among settlement signs, but one sticking window on its own does not prove the foundation moved.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#faq-1","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Why do my windows stick in late summer but work fine in spring?","answer":"Expansive clay shrinks as it dries and swells as it wets, so foundations on clay can move with the seasons. Openings that change with the seasons fit that pattern, which is why the season of each observation is recorded.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#faq-2","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Does cracked window glass mean the foundation moved?","answer":"Not by itself. Cracked glass is recorded together with drywall cracks, brick cracks and floor slope, and the overall pattern plus an elevation survey is used to decide whether foundation movement is involved.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#faq-3","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Sticking windows, cracked glass: Will a home inspector tell me if the foundation is failing?","answer":"A home inspector reports signs of possible foundation movement. Inspection standards say inspectors are not required to judge the adequacy of structural systems or provide engineering services.","url":"https://terrabrain.vercel.app/signs/windows-sticking-or-cracked-glass#faq-4","section":"signs","topic":"Sticking windows, cracked glass"},{"question":"Are there gypsum sinkholes in western Oklahoma?","answer":"Yes, in places. Gypsum near the surface can dissolve in groundwater, leaving voids that let the ground above sag or collapse.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes","section":"guides"},{"question":"What is karst?","answer":"Karst is a landscape formed where rock dissolves in water. The U.S. Geological Survey groups two families of soluble rock:","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#what-is-karst","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Where is gypsum found in western Oklahoma?","answer":"The Cottonwood soil series formed in material weathered from massive gypsum, mostly alabaster, of the Permian-age Blaine Formation. It occurs in southwestern Oklahoma and northwest Texas. In these soils:","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#where-is-gypsum-found-in-western-oklahoma","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Gypsum karst and sinkholes: What about limestone and dolomite?","answer":"The Oklahoma Geological Survey notes that marine carbonate rocks of Late Cambrian and Ordovician age underlie most of the state, and that carbonates reach more than 8,000 feet thick near the Southern Oklahoma Aulacogen, described as part of a failed triple junction, an ancient rift that stopped developing.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#what-about-limestone-and-dolomite","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"What are the field signs of karst?","answer":"These are the kinds of observations that prompt a closer look for voids:","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#what-are-the-field-signs-of-karst","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Gypsum karst and sinkholes: What are the limits of the maps?","answer":"The USGS karst map shows where soluble rock occurs, but it does not rate hazards such as sinkhole collapse. It is a first approximation intended to guide more detailed study of specific areas.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#what-are-the-limits-of-the-maps","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Gypsum karst and sinkholes: What should repairs consider on soluble rock?","answer":"Because water drives dissolution, controlling surface drainage near a suspected void is a common first concern; see surface drainage and grading. Repair approaches are described on void and compaction grouting and working with engineers.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#what-should-repairs-consider-on-soluble-rock","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"What is karst?","answer":"Karst is ground shaped by rock that dissolves in water, such as gypsum, salt, limestone and dolomite. Dissolution can leave caves and voids, and the ground above can sag or collapse into sinkholes.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#faq-1","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Does Oklahoma have gypsum near the surface?","answer":"Yes. In parts of western and southwestern Oklahoma, soils such as Cottonwood sit only a few inches above massive gypsum of the Permian Blaine Formation.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#faq-2","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Gypsum karst and sinkholes: Where can I report a sinkhole in Oklahoma?","answer":"The Oklahoma Geological Survey provides an online sinkhole report form through its FAQ page.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#faq-3","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Gypsum karst and sinkholes: Do sinkhole hazard maps show which houses are at risk?","answer":"No. The national USGS karst map shows where soluble rocks occur, but it does not rate sinkhole collapse hazard for specific sites; it is meant to guide more detailed local study.","url":"https://terrabrain.vercel.app/guides/gypsum-karst-and-sinkholes#faq-4","section":"guides","topic":"Gypsum karst and sinkholes"},{"question":"Can a foundation crack because it was built wrong?","answer":"Yes. Thin beams, missing or misplaced steel, weak concrete or a poor pad can leave a foundation unable to bridge ordinary soil movement.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency","section":"causes"},{"question":"What counts as a construction deficiency?","answer":"Texas engineering guidelines list inadequate design or construction as one of the causes of residential foundation distress, alongside soil shrink and swell, unanticipated loads, material deterioration, compressible soils, landscaping, leaking plumbing and slope instability.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#what-counts-as-a-construction-deficiency","section":"causes","topic":"Original construction defects"},{"question":"What are the signs of a construction deficiency?","answer":"visible slab cracks; diagonal drywall cracks at openings; sloping floors.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#what-are-the-signs-of-a-construction-deficiency","section":"causes","topic":"Original construction defects"},{"question":"How is a construction deficiency evaluated?","answer":"Because new slabs are not perfectly level, the Foundation Performance Association notes that movement cannot be determined accurately without a baseline elevation survey. See tolerances and standards and elevation surveys.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#how-is-a-construction-deficiency-evaluated","section":"causes","topic":"Original construction defects"},{"question":"Original construction defects: How is a deficient foundation typically addressed?","answer":"Texas guidelines list underpinning, grouting, mudjacking, crack injection, tendon stressing, and partial demolition and reconstruction among slab repair methods.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#how-is-a-deficient-foundation-typically-addressed","section":"causes","topic":"Original construction defects"},{"question":"Original construction defects: Can a foundation crack because it was built wrong?","answer":"Yes. Texas engineering guidelines list inadequate design or construction among the causes of residential foundation distress, alongside soil movement, unanticipated loads and material deterioration.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#faq-1","section":"causes","topic":"Original construction defects"},{"question":"What construction mistakes cause concrete to crack?","answer":"Concrete industry guidance lists missing or poorly placed joints, poor subgrade preparation, high-slump concrete or added water, improper finishing and inadequate curing as common construction causes of cracking.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#faq-2","section":"causes","topic":"Original construction defects"},{"question":"Original construction defects: How level is a new slab supposed to be?","answer":"The Foundation Performance Association notes that ACI 117 allows an overall levelness tolerance of 1.5 inches and that most residential slabs are built to within about 1 inch of level, which is why a baseline survey matters when judging movement.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#faq-3","section":"causes","topic":"Original construction defects"},{"question":"Original construction defects: How is a deficient foundation repaired?","answer":"Texas guidelines list underpinning, grouting, mudjacking, crack injection, tendon stressing and partial demolition and reconstruction among slab repair methods. Which applies depends on what the deficiency is and how the foundation is performing.","url":"https://terrabrain.vercel.app/causes/original-construction-deficiency#faq-4","section":"causes","topic":"Original construction defects"},{"question":"Can a high water bill mean a leak affecting my foundation?","answer":"A rising bill with no change in use usually means a leak. A leak under a slab can wet expansive clay and push part of the floor up.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill","section":"signs"},{"question":"Unexplained high water bill: What does this sign look like?","answer":"Monthly use rises and stays high, or spikes, without new people, a pool, or a change in watering. EPA suggests comparing month-to-month use on the bill to spot spikes. This is relevant to slab-on-grade, post-tensioned and crawl space houses.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#what-does-this-sign-look-like","section":"signs","topic":"Unexplained high water bill"},{"question":"Unexplained high water bill: How common are household leaks?","answer":"EPA estimates that household leaks waste nearly 1 trillion gallons of water a year nationwide, and that an average household's leaks can waste more than 9,300 gallons a year. About 9 percent of homes have leaks that waste 50 gallons or more per day.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#how-common-are-household-leaks","section":"signs","topic":"Unexplained high water bill"},{"question":"Unexplained high water bill: How do you check for a leak?","answer":"If the meter moves and no fixture or irrigation leak is found, the leak may be in a buried line or under the slab. See plumbing leak detection and repair.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#how-do-you-check-for-a-leak","section":"signs","topic":"Unexplained high water bill"},{"question":"Unexplained high water bill: Why does an under-slab leak matter for the foundation?","answer":"Expansive clay swells when it gains water. Broken water or sewer pipes add moisture that can worsen swelling damage to nearby structures. Foundation design guidance names leaking utility lines as a source of water that can wet the soil and cause foundation heave.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#why-does-an-under-slab-leak-matter-for-the-foundation","section":"signs","topic":"Unexplained high water bill"},{"question":"How can I tell if I have a hidden water leak?","answer":"EPA's meter test is to pick a two-hour period when no water is used and read the meter before and after. If the reading changes, there is probably a leak.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#faq-1","section":"signs","topic":"Unexplained high water bill"},{"question":"How much water use is too much in winter?","answer":"EPA guidance says a family of four using more than 12,000 gallons per month in a cold month such as January or February probably has a serious leak.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#faq-2","section":"signs","topic":"Unexplained high water bill"},{"question":"Unexplained high water bill: Can a leak under my slab damage the foundation?","answer":"Yes. Water from leaking supply or sewer lines wets the soil under the slab, and on expansive clay that can cause swelling and heave. Engineering guidance names leaking utility lines as a cause of foundation heave.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#faq-3","section":"signs","topic":"Unexplained high water bill"},{"question":"Unexplained high water bill: What leaks are most common in homes?","answer":"EPA points to worn toilet flappers, dripping faucets, leaking showerheads and irrigation system damage as common household leaks, along with hidden leaks at water heaters and appliance supply lines.","url":"https://terrabrain.vercel.app/signs/unexplained-high-water-bill#faq-4","section":"signs","topic":"Unexplained high water bill"},{"question":"Can a plumbing leak under a slab cause a floor hump?","answer":"Yes. A supply or drain leak under a slab on expansive clay wets the soil, which swells and pushes up a local floor hump with cracks radiating from it.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave","section":"causes"},{"question":"How does a leak lift a floor?","answer":"Expansive clay swells when it gains moisture and shrinks when it loses it, and it is changes in moisture, not the clay itself, that cause movement. Leaking water or sewage pipes add water to the soil around them and can worsen swelling damage.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#how-does-a-leak-lift-a-floor","section":"causes","topic":"Floor hump from slab leak"},{"question":"What Oklahoma conditions make leak heave likely?","answer":"An Oklahoma State University study using USDA soil survey data found that nearly all of Oklahoma has medium or high swelling potential, so a leak under a slab in most of the state is sitting on soil that can swell.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#what-oklahoma-conditions-make-leak-heave-likely","section":"causes","topic":"Floor hump from slab leak"},{"question":"What are the signs of leak heave?","answer":"an interior floor hump over the leak area; floor tile cracks in a line or flooring that tents up; an unexplained high water bill.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#what-are-the-signs-of-leak-heave","section":"causes","topic":"Floor hump from slab leak"},{"question":"Floor hump from slab leak: Is it heave or collapse?","answer":"The same water can do the opposite on a different soil. On expansive clay, a leak causes swelling and a hump. On loose, collapsible silt, water weakens the bonds between grains and the soil compacts, so the floor drops instead.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#is-it-heave-or-collapse","section":"causes","topic":"Floor hump from slab leak"},{"question":"How is the leak found?","answer":"Meter test. Read the water meter, use no water for two hours, and read it again; a change suggests a leak; Water bills. A family of four using more than 12,000 gallons a month in winter probably has a leak; How common leaks are.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#how-is-the-leak-found","section":"causes","topic":"Floor hump from slab leak"},{"question":"How is leak heave typically addressed?","answer":"Repair the leak. Leaks found in testing are repaired. See plumbing leak detection and repair; Monitor.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#how-is-leak-heave-typically-addressed","section":"causes","topic":"Floor hump from slab leak"},{"question":"Can a leak under my slab make the floor rise?","answer":"Yes. On expansive clay, water from a leaking supply or drain line makes the soil around the leak swell, and the slab above it rises into a local hump. Leaking water and sewage pipes are a recognized source of swelling damage.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#faq-1","section":"causes","topic":"Floor hump from slab leak"},{"question":"How do I check for a water leak under the slab?","answer":"The EPA describes a whole-house meter test: read the water meter, use no water for two hours, and read it again. If the reading changed, there is likely a leak. Drain lines need a separate test because they are not under constant pressure.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#faq-2","section":"causes","topic":"Floor hump from slab leak"},{"question":"How common are household leaks?","answer":"The EPA estimates that leaks in an average home can waste more than 10,000 gallons a year and that about 10 percent of homes have leaks wasting 90 gallons or more per day.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#faq-3","section":"causes","topic":"Floor hump from slab leak"},{"question":"Will the hump go down after the leak is fixed?","answer":"Clay that has swelled can lose moisture again after the water source is removed, which is why engineers often recommend fixing the leak and then monitoring elevations before deciding on other repairs.","url":"https://terrabrain.vercel.app/causes/leak-induced-localized-heave#faq-4","section":"causes","topic":"Floor hump from slab leak"},{"question":"Can an under-slab plumbing leak move an Oklahoma foundation?","answer":"Yes. A leak under a slab can make expansive clay swell and lift the floor or soften and wash out looser soil, so the leak must be fixed for a lasting repair.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab","section":"guides"},{"question":"Under-slab plumbing leaks: How does a leak move a foundation?","answer":"Expansive clay swells when water enters and shrinks when it dries. Most moisture-driven movement starts at the outer walls, but water that reaches the soil under the middle of a house, including from plumbing leaks, can cause movement in the interior too.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#how-does-a-leak-move-a-foundation","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"What are the warning signs of a slab leak?","answer":"A rising area in the floor, with cracks spreading from it (interior floor hump); Unexplained high water use. The EPA notes that a family of four using more than 12,000 gallons a month in winter probably has serious leaks.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#what-are-the-warning-signs-of-a-slab-leak","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: What simple leak checks does EPA guidance suggest?","answer":"Household leaks are common: the EPA estimates that about 9% of homes have leaks wasting 50 gallons or more a day, and that the average household's leaks waste more than 9,300 gallons a year.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#what-simple-leak-checks-does-epa-guidance-suggest","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: Why does the order of work matter?","answer":"Engineering guidance on expansive soils puts dealing with the causes of uneven moisture first, including repairing plumbing leaks and revising site drainage.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#why-does-the-order-of-work-matter","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"Can a plumbing leak cause foundation problems?","answer":"Yes. Leaking pipes add water to the soil under a house. On expansive clay that water can make the soil swell and lift part of the slab, and engineering sources list plumbing leaks among the causes of uneven moisture under foundations.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#faq-1","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: How can I check for a hidden water leak?","answer":"The EPA suggests reading the water meter, using no water for two hours, and reading it again. If the reading changed, there is likely a leak.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#faq-2","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"Is a high water bill a sign of a slab leak?","answer":"It can be. The EPA notes that a family of four using more than 12,000 gallons a month in winter probably has a serious leak somewhere in the system.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#faq-3","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: Should a leak be fixed before foundation repair?","answer":"Engineering guidance on expansive soils lists repairing plumbing leaks among the first steps, because leveling a foundation without removing the source of extra moisture can produce only temporary results.","url":"https://terrabrain.vercel.app/guides/plumbing-leaks-under-slab#faq-4","section":"guides","topic":"Under-slab plumbing leaks"},{"question":"Can earthquakes damage Oklahoma homes and foundations?","answer":"Yes. Strong shaking can crack chimneys, brick and masonry walls. Most Oklahoma quakes are too small to cause damage, but the larger 2016 events did.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage","section":"causes"},{"question":"How does shaking damage a house?","answer":"During an earthquake the house is shaken along with the ground, and FEMA guidance identifies brittle masonry elements as the most vulnerable parts of a home.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#how-does-shaking-damage-a-house","section":"causes","topic":"Earthquake shaking damage"},{"question":"What earthquakes has Oklahoma had?","answer":"Oklahoma's earthquake rate rose sharply in the last decade, and the USGS links the increase to injection of large volumes of saltwater produced with oil and gas.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#what-earthquakes-has-oklahoma-had","section":"causes","topic":"Earthquake shaking damage"},{"question":"Earthquake shaking damage: What is the difference between magnitude and intensity?","answer":"Intensity is different from magnitude: it describes the effects of shaking at a particular place, which the USGS says makes it a more meaningful measure of severity for nonscientists.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#what-is-the-difference-between-magnitude-and-intensity","section":"causes","topic":"Earthquake shaking damage"},{"question":"What are the signs of earthquake damage?","answer":"Signs that appear with shaking damage include: - fresh, clean-edged cracks appearing suddenly - a chimney separating or leaning - diagonal drywall cracks at openings - vertical brick or veneer cracks","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#what-are-the-signs-of-earthquake-damage","section":"causes","topic":"Earthquake shaking damage"},{"question":"How is earthquake damage typically addressed?","answer":"FEMA advises inspecting the firebox and checking the support and anchorage of masonry veneer before chimney repair begins, and recommends lightweight metal flues in place of rebuilding a damaged chimney in its original form.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#how-is-earthquake-damage-typically-addressed","section":"causes","topic":"Earthquake shaking damage"},{"question":"Can Oklahoma earthquakes damage a house?","answer":"Most Oklahoma earthquakes are magnitude 3 to 4, which are usually felt but rarely damaging. Larger events, such as the magnitude 5.8 Pawnee and magnitude 5.0 Cushing earthquakes in 2016, did cause damage.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#faq-1","section":"causes","topic":"Earthquake shaking damage"},{"question":"What part of a house is most likely to be damaged by an earthquake?","answer":"Masonry chimneys are highly susceptible to earthquake shaking, especially older unreinforced chimneys with degraded mortar. Unreinforced brick, block and stone walls are also vulnerable.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#faq-2","section":"causes","topic":"Earthquake shaking damage"},{"question":"How can I find out how strong the shaking was at my house?","answer":"The USGS publishes intensity maps for earthquakes, including Did You Feel It? maps built from public reports grouped by ZIP code. The Oklahoma Geological Survey also maintains a recent earthquakes map for the state.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#faq-3","section":"causes","topic":"Earthquake shaking damage"},{"question":"Are Oklahoma earthquakes still increasing?","answer":"No. The rate of magnitude 3 and larger earthquakes peaked in 2015 and then declined. The Oklahoma Corporation Commission credits reduced wastewater injection with a drop of more than 90 percent in magnitude 3.0 earthquakes since 2015.","url":"https://terrabrain.vercel.app/causes/earthquake-shaking-damage#faq-4","section":"causes","topic":"Earthquake shaking damage"},{"question":"Can removing a tree make my foundation heave?","answer":"Yes. A large tree can dry the clay under a house for years; once it is removed, water returns and the clay slowly swells and pushes up what sits on it.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave","section":"causes"},{"question":"How does heave after tree removal happen?","answer":"Clay-rich soil shrinks as it dries and swells as it takes on water. This is called shrink-swell behavior. Heave is the upward movement of the ground, mainly in low-permeability soils like clay, as they absorb water and swell.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#how-does-heave-after-tree-removal-happen","section":"causes","topic":"Heave after tree removal"},{"question":"What controls the amount of heave?","answer":"Linear extensibility is a soil survey measure of how much a soil changes in length between moist and oven-dry; low is under 3%, moderate 3-6%, high 6-9% and very high above 9%.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#what-controls-the-amount-of-heave","section":"causes","topic":"Heave after tree removal"},{"question":"What does heave after tree removal look like?","answer":"Heave lifts the part of the house nearest the old tree. Field notes associate it with stair-step brick cracks wider at the bottom, sticking doors and, where the dried zone extended under the slab, an interior floor hump.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#what-does-heave-after-tree-removal-look-like","section":"causes","topic":"Heave after tree removal"},{"question":"How is heave after tree removal handled?","answer":"Because the movement is ongoing, options matched to this mechanism focus on time and moisture rather than lifting:","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#how-is-heave-after-tree-removal-handled","section":"causes","topic":"Heave after tree removal"},{"question":"Can removing a tree make my foundation rise?","answer":"On shrinkable clay, yes. A large tree draws water out of the soil; once it is gone, water slowly returns, the clay swells and the ground under nearby foundations can rise. This is called heave.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#faq-1","section":"causes","topic":"Heave after tree removal"},{"question":"How long does heave continue after a tree is cut down?","answer":"It continues until the soil moisture reaches a new balance, and published guidance says that timeframe is often hard to predict. It depends on the tree's water demand, how permeable the soil is and how much water is available.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#faq-2","section":"causes","topic":"Heave after tree removal"},{"question":"Does every tree removal cause heave?","answer":"No. Horticultural guidance describes heave after felling as uncommon, occurring where the clay has a persistent moisture deficit created by the tree. Sandy or low-shrink soils are much less affected.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#faq-3","section":"causes","topic":"Heave after tree removal"},{"question":"Is cutting the tree back an alternative to removing it?","answer":"Crown reduction can lessen ground movement, but published guidance says it must remove at least 70% of crown volume and be repeated about every three years. Crown thinning has been found ineffective at reducing water use.","url":"https://terrabrain.vercel.app/causes/post-tree-removal-heave#faq-4","section":"causes","topic":"Heave after tree removal"},{"question":"Can slow drains or sewer backups signal foundation movement?","answer":"On expansive clay, soil movement can break buried drain pipes and a leaking drain can make the slab heave, so the two are often checked together.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups","section":"signs"},{"question":"Slow drains and sewer backups: What does this sign look like?","answer":"Several fixtures drain slowly, toilets gurgle, or sewage backs up into a low tub or floor drain. On its own this does not point to the foundation. It becomes a foundation question when it shows up with floor cracks, a hump in the floor, or an unexplained rise in the water bill.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups#what-does-this-sign-look-like","section":"signs","topic":"Slow drains and sewer backups"},{"question":"Slow drains and sewer backups: How do soil movement and drain lines interact?","answer":"Expansive clay swells when it gets wetter and shrinks as it dries. The depth where this seasonal moisture change happens is often called the active zone. Shallow plastic pipes that sit in this zone of seasonal moisture change are exposed to large stresses from shrinking soil.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups#how-do-soil-movement-and-drain-lines-interact","section":"signs","topic":"Slow drains and sewer backups"},{"question":"Slow drains and sewer backups: How is it documented?","answer":"Engineering repair guidance calls for testing water supply and sanitary drain lines for leaks when jacking or lifting is part of the work, and for repairing leaks that are found; gas lines may also need adjustment.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups#how-is-it-documented","section":"signs","topic":"Slow drains and sewer backups"},{"question":"Slow drains and sewer backups: What order should the work follow?","answer":"Repair guidance for expansive-soil foundations puts correcting moisture sources, including plumbing leaks and drainage, first, with leveling after. Insurance treatment of leaks and resulting damage in Oklahoma is covered in plumbing leaks and insurance.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups#what-order-should-the-work-follow","section":"signs","topic":"Slow drains and sewer backups"},{"question":"Can foundation movement break my sewer line?","answer":"Shallow plastic pipes that run through the zone of seasonal soil moisture change are exposed to large stresses from shrinking and swelling clay. Movement of the soil and slab around them is one way drain lines can be damaged.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups#faq-1","section":"signs","topic":"Slow drains and sewer backups"},{"question":"Can a broken sewer line cause foundation problems?","answer":"Yes. Water from broken water or sewer pipes adds moisture to the soil, which can make expansive clay swell and worsen damage to nearby structures. Engineering guidance lists leaking utility lines as a cause of foundation heave.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups#faq-2","section":"signs","topic":"Slow drains and sewer backups"},{"question":"Should drains be tested before a foundation is lifted?","answer":"Engineering repair guidance calls for testing water supply and sanitary drain lines for leaks when jacking or lifting is part of the work, and for repairing any leaks found.","url":"https://terrabrain.vercel.app/signs/slow-drains-or-sewer-backups#faq-3","section":"signs","topic":"Slow drains and sewer backups"},{"question":"Can tree roots cause foundation settlement on Oklahoma clay?","answer":"Yes. Roots under a foundation can dry and shrink expansive clay, so the side or corner nearest the tree settles, worst in summer and drought.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement","section":"causes"},{"question":"How do tree roots cause settlement?","answer":"Clay soil shrinks as it loses water. Trees on shrinkable clay can draw moisture from soil under foundations during long dry spells; the soil contracts and the building can sink, often cracking around windows and doors.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#how-do-tree-roots-cause-settlement","section":"causes","topic":"Tree roots drying clay"},{"question":"Tree roots drying clay: How do season and drought affect it?","answer":"Texas monitoring of slabs on expansive clay found that settlement grew as the growing season progressed, droughts made it worse, and above-normal rain slowed it. Deciduous trees are less active in winter, and winter dormancy, rain and lower evaporation let slabs partly recover.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#how-do-season-and-drought-affect-it","section":"causes","topic":"Tree roots drying clay"},{"question":"How do tree distance and species matter?","answer":"Larger trees, and trees closer to the building, carry more risk. See trees and roots.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#how-do-tree-distance-and-species-matter","section":"causes","topic":"Tree roots drying clay"},{"question":"What does tree-related settlement look like?","answer":"Damage concentrates toward the tree rather than around the whole perimeter. Field notes link it to stair-step brick cracks wider at the top, soil pulled away from the foundation, sticking doors, diagonal drywall cracks at openings and cracks that open and close seasonally.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#what-does-tree-related-settlement-look-like","section":"causes","topic":"Tree roots drying clay"},{"question":"Tree roots drying clay: What repair and moisture-control approaches are used?","answer":"Root barriers and moisture control: a Texas case history combined a root and moisture barrier with drainage improvements.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#what-repair-and-moisture-control-approaches-are-used","section":"causes","topic":"Tree roots drying clay"},{"question":"Can a tree make my foundation sink?","answer":"On shrinkable clay, yes. Tree roots draw water out of the soil, the clay shrinks, and the part of the foundation nearest the tree can settle, often with cracks around windows and doors.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#faq-1","section":"causes","topic":"Tree roots drying clay"},{"question":"How far from the house does a tree have to be?","answer":"Horticultural guidance says soil drying from high-water-demand trees can reach about the tree's height away, and for lower-demand species it is unlikely to reach beyond half the tree's height.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#faq-2","section":"causes","topic":"Tree roots drying clay"},{"question":"Tree roots drying clay: Why is the damage worse in summer?","answer":"Trees use the most water in the growing season, and drought adds to the drying. Texas monitoring found slabs settled as the summer progressed and partly recovered in winter when deciduous trees were dormant.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#faq-3","section":"causes","topic":"Tree roots drying clay"},{"question":"How deep can tree roots dry the soil?","answer":"Deeper than normal seasonal drying. In one Houston case study, tree water demand extended the active zone to about 28 feet, compared with the 4 to 8 feet usually assumed there.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#faq-4","section":"causes","topic":"Tree roots drying clay"},{"question":"Which trees use the most water?","answer":"Published UK guidance lists oak, poplar, willow and eucalyptus among high-water-demand broadleaf trees, and notes that oak accounts for the most subsidence cases in the UK.","url":"https://terrabrain.vercel.app/causes/tree-root-desiccation-settlement#faq-5","section":"causes","topic":"Tree roots drying clay"},{"question":"Can trees damage a foundation in Oklahoma clay soil?","answer":"Large trees rarely push a foundation. They mainly cause damage by drawing water from clay, which shrinks and lets the nearby part of the house settle.","url":"https://terrabrain.vercel.app/guides/trees-and-roots","section":"guides"},{"question":"How do trees affect a foundation?","answer":"Oklahoma's expansive clays swell when wet and shrink when dry (see shrink-swell and the active zone). A tree adds a strong, local drying force to that cycle.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#how-do-trees-affect-a-foundation","section":"guides","topic":"Trees and roots"},{"question":"Where are the roots?","answer":"OSU Extension describes tree roots as mostly shallow and wide:","url":"https://terrabrain.vercel.app/guides/trees-and-roots#where-are-the-roots","section":"guides","topic":"Trees and roots"},{"question":"Trees and roots: Which Oklahoma tree species matter?","answer":"OSU Extension's tree selection guide describes root and growth traits for common Oklahoma trees:","url":"https://terrabrain.vercel.app/guides/trees-and-roots#which-oklahoma-tree-species-matter","section":"guides","topic":"Trees and roots"},{"question":"How far from a house should trees be planted?","answer":"The City of Oklahoma City's planting guide says medium and large trees should be planted no closer than 30 feet to buildings or structures; The same guide allows trees listed as suitable near water lines at 5 feet from lines 4 inches in diameter, or 10 feet from larger lines; OSU Extension advises planting at least half the mature canopy width away from the home, and keeping fast-growing or weak-wooded trees well away from buildings.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#how-far-from-a-house-should-trees-be-planted","section":"guides","topic":"Trees and roots"},{"question":"Trees and roots: What signs suggest a tree is involved?","answer":"Field clues that point toward a tree include settlement on the side of the house nearest the tree, cracks that open toward it (for example stair-step cracks wider at the top), and soil pulled away from the foundation near the root zone.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#what-signs-suggest-a-tree-is-involved","section":"guides","topic":"Trees and roots"},{"question":"Trees and roots: What options do people consider?","answer":"Root barriers and moisture control. A vertical barrier between tree and house, or steady soil moisture, aims to limit drying under the footing. See root barriers and moisture control; Tree management or removal. See tree management; Piers.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#what-options-do-people-consider","section":"guides","topic":"Trees and roots"},{"question":"Do tree roots push foundations and crack them?","answer":"Usually the bigger effect is drying. Roots draw water out of clay soil, the clay shrinks, and the footing on that side can settle. Many roots reach a foundation and then grow along it rather than under it.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#faq-1","section":"guides","topic":"Trees and roots"},{"question":"Trees and roots: How far from my house should a tree be planted in Oklahoma?","answer":"Oklahoma City's planting guide says medium and large trees should be no closer than 30 feet to buildings. OSU Extension says to plant at least half the tree's mature canopy width away from the home.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#faq-2","section":"guides","topic":"Trees and roots"},{"question":"Trees and roots: Can cutting down a big tree near my house cause problems?","answer":"It can. Once the tree stops drawing water, moisture slowly returns to the clay, which can swell and push the ground up (heave). Building guidance warns this swelling can damage nearby foundations, especially on clay.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#faq-3","section":"guides","topic":"Trees and roots"},{"question":"How far do tree roots spread?","answer":"OSU Extension says roots often spread up to three times the canopy width, and up to five times in shallow soils over clay. Most absorbing roots sit in the top 24 inches of soil.","url":"https://terrabrain.vercel.app/guides/trees-and-roots#faq-4","section":"guides","topic":"Trees and roots"},{"question":"Can vibration from construction or blasting crack a house?","answer":"Blasting, pile driving or heavy equipment can stress finishes and lengthen existing cracks, but most Oklahoma home cracking traces to soil movement.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare","section":"causes"},{"question":"What does vibration do to a house?","answer":"Ground vibration moves a house back and forth for a short time. The parts most likely to show it are brittle finishes: plaster, drywall tape joints, ceramic tile, mortar joints and brick veneer. Where a crack already exists, shaking can extend it.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#what-does-vibration-do-to-a-house","section":"causes","topic":"Vibration-related cracking"},{"question":"What are common sources of vibration?","answer":"Quarry and construction blasting; Pile driving, vibratory compaction and demolition; Heavy truck or rail traffic close to the house.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#what-are-common-sources-of-vibration","section":"causes","topic":"Vibration-related cracking"},{"question":"How strong does vibration have to be to damage a house?","answer":"Ground vibration is measured as peak particle velocity, the top speed at which the ground moves as the wave passes, in inches per second. A U.S. Bureau of Mines study of homes near a large surface coal mine cited historical damage thresholds of 0.5 to 2.0 inches per second.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#how-strong-does-vibration-have-to-be-to-damage-a-house","section":"causes","topic":"Vibration-related cracking"},{"question":"Vibration-related cracking: What rules limit blasting near homes?","answer":"Federal coal-mining rules cap peak particle velocity at the nearest dwelling by distance from the blast:","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#what-rules-limit-blasting-near-homes","section":"causes","topic":"Vibration-related cracking"},{"question":"Vibration-related cracking: Why is soil movement the usual suspect?","answer":"Expansive clay moves a house in a slow, repeating cycle. The zone of seasonal moisture change can extend from 3 to 40 feet deep, and the soil swells when wet and shrinks when dry.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#why-is-soil-movement-the-usual-suspect","section":"causes","topic":"Vibration-related cracking"},{"question":"How can vibration and soil cracking be told apart?","answer":"See fresh, clean-edged cracks appearing suddenly, cracks that open and close seasonally and seismic damage vs soil movement.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#how-can-vibration-and-soil-cracking-be-told-apart","section":"causes","topic":"Vibration-related cracking"},{"question":"How is a possible vibration claim documented?","answer":"Date-stamped photos of cracks with a scale in the frame; Seismograph readings or quarry blast logs, where they exist for the project.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#how-is-a-possible-vibration-claim-documented","section":"causes","topic":"Vibration-related cracking"},{"question":"How is vibration cracking usually handled?","answer":"When vibration only extended finish cracks, the matched options are cosmetic repair only and a monitoring program to confirm the cracks are not growing.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#how-is-vibration-cracking-usually-handled","section":"causes","topic":"Vibration-related cracking"},{"question":"Vibration-related cracking: Can nearby construction crack my house?","answer":"Vibration can load brittle finishes such as plaster, drywall tape and brick, and it may extend cracks that already exist. Cracks from ongoing soil movement are far more common in Oklahoma, so the timing and pattern of the cracks matter.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#faq-1","section":"causes","topic":"Vibration-related cracking"},{"question":"How do I tell vibration cracks from foundation movement?","answer":"Cracks tied to a specific event tend to appear at once and have fresh, clean edges. Cracks from expansive clay usually grow over time and open and close with the seasons.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#faq-2","section":"causes","topic":"Vibration-related cracking"},{"question":"What records help show vibration was the cause?","answer":"Seismograph readings kept for blasting or construction, quarry blast logs, earthquake catalogs and dated photos of the home before and after the event help establish timing.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#faq-3","section":"causes","topic":"Vibration-related cracking"},{"question":"Vibration-related cracking: How long do Oklahoma mines and quarries keep blasting records?","answer":"Oklahoma's non-coal mining rules require a record of each blast, including seismograph readings where required, to be kept for at least three years and made available to the Department of Mines on request.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#faq-4","section":"causes","topic":"Vibration-related cracking"},{"question":"Do Oklahoma earthquakes count as vibration damage?","answer":"Earthquakes are a separate, natural or induced source of shaking. Oklahoma had about two magnitude 3.0 or larger earthquakes per year before 2009 and 903 in 2015.","url":"https://terrabrain.vercel.app/causes/vibration-related-cracking-rare#faq-5","section":"causes","topic":"Vibration-related cracking"},{"question":"Do root barriers and moisture barriers protect foundations?","answer":"Buried root and moisture barriers keep roots and seasonal drying away from soil under a foundation. They support other repairs but cannot lift a foundation.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control","section":"repairs"},{"question":"Why does moisture control matter on clay?","answer":"Oklahoma's expansive clays shrink as they dry and swell as they wet. Uneven moisture around a house — dry under one corner, wet under another — produces uneven movement.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#why-does-moisture-control-matter-on-clay","section":"repairs","topic":"Root and moisture barriers"},{"question":"How do root barriers work?","answer":"A root barrier is a vertical sheet, such as heavy plastic, set in a trench between a tree and the foundation. Its purpose is to stop roots from growing under the slab and drawing water from the clay there.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#how-do-root-barriers-work","section":"repairs","topic":"Root and moisture barriers"},{"question":"How do vertical moisture barriers work?","answer":"A vertical moisture barrier is a deeper buried sheet around the perimeter meant to slow water moving sideways into or out of the soil under the slab edge. This reduces the seasonal wetting and drying that drives perimeter drying settlement and perimeter wetting heave.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#how-do-vertical-moisture-barriers-work","section":"repairs","topic":"Root and moisture barriers"},{"question":"Root and moisture barriers: Should you water around the foundation?","answer":"Watering the soil around a foundation in drought is debated because it can help or hurt. Published maintenance guidance for expansive soils says:","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#should-you-water-around-the-foundation","section":"repairs","topic":"Root and moisture barriers"},{"question":"What landscaping supports moisture control?","answer":"The same maintenance guide recommends:","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#what-landscaping-supports-moisture-control","section":"repairs","topic":"Root and moisture barriers"},{"question":"What are the limits of barriers and moisture control?","answer":"Barriers and watering do not lift a foundation or repair existing damage; guidance treats maintenance systems as performance aids, not repairs; Barriers can be bypassed by roots and must be deep enough for the root zone; Watering must be kept even, and overwatering can itself cause movement.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#what-are-the-limits-of-barriers-and-moisture-control","section":"repairs","topic":"Root and moisture barriers"},{"question":"What does a root barrier do for a foundation?","answer":"A root barrier is a vertical sheet set in a trench between a tree and the house. It is meant to keep roots from growing under the foundation and drying the clay there.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#faq-1","section":"repairs","topic":"Root and moisture barriers"},{"question":"Do root barriers always work?","answer":"No. Research found roots deflected by vertical barriers can grow under them and return toward the surface, and engineering guidance lists removing roots that grow past barriers as a maintenance task.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#faq-2","section":"repairs","topic":"Root and moisture barriers"},{"question":"Root and moisture barriers: Should I water my foundation during an Oklahoma drought?","answer":"Engineering maintenance guidance says to irrigate soil around the foundation in dry weather where expansive soils occur, keeping moisture uniform, watering at least one to two feet away, and not watering directly into a shrinkage gap.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#faq-3","section":"repairs","topic":"Root and moisture barriers"},{"question":"Root and moisture barriers: Can watering a foundation cause problems?","answer":"Yes. Uneven or excessive watering can cause swelling and movement, and automatic systems can fail and run continuously, so they need to be maintained.","url":"https://terrabrain.vercel.app/repairs/root-barriers-and-moisture-control#faq-4","section":"repairs","topic":"Root and moisture barriers"},{"question":"Do sticking doors or tapered door gaps mean foundation movement?","answer":"They can. Out-of-square door frames are a listed sign of possible foundation movement, but the pattern across the house and a floor survey decide the cause.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps","section":"signs"},{"question":"Doors binding, tapered gaps: What does this sign look like?","answer":"A door that rubs the frame at the top or on the latch side, or needs force to close; A latch or deadbolt that no longer lines up with the strike plate; A gap above the door (at the head, the top piece of the frame) that is wider at one end than the other.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#what-does-this-sign-look-like","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Why does foundation movement show up at doors?","answer":"A door frame is a rectangle set into the wall framing. When one part of a foundation moves more than another, the framing above it is pulled out of square.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#why-does-foundation-movement-show-up-at-doors","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Doors binding, tapered gaps: How does Oklahoma clay move a house?","answer":"Expansive clay (also called shrink-swell clay) swells when it gets wetter and shrinks when it dries.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#how-does-oklahoma-clay-move-a-house","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Doors binding, tapered gaps: How do you read the pattern?","answer":"Other mechanisms in this library, such as fill consolidation settlement, pier movement after repair and interior support failure in crawl spaces, are covered on their own pages.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#how-do-you-read-the-pattern","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Doors binding, tapered gaps: How is it documented?","answer":"Each affected door: wall, floor level, where it rubs, and which end of the head gap is wider; The date of each observation, since the ASCE homeowner guide advises monitoring existing cracks for progressive or seasonal movement; Nearby signs: diagonal drywall cracks at openings, sticking windows, sloping floors.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#how-is-it-documented","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Doors binding, tapered gaps: Can a sticking door mean my foundation is moving?","answer":"It can. Home inspection standards list out-of-square door frames among indications of possible foundation movement, and civil engineering guidance lists poor door alignment as an indication of movement. One sticking door on its own does not prove the foundation moved.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#faq-1","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Doors binding, tapered gaps: Why is the gap at the top of my door wider on one side?","answer":"When a foundation moves unevenly, the wall framing around the door is pushed out of square, a condition engineers call racking. The door then sits at an angle in its frame, so the gap above it tapers from one side to the other.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#faq-2","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Why do my doors stick in some seasons but not others?","answer":"Expansive clay swells when wet and shrinks when dry, and that moisture cycle repeats year after year. Openings that change with the seasons fit that pattern, which is why the season is recorded with each observation.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#faq-3","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Doors binding, tapered gaps: Does a home inspector decide whether the foundation has failed?","answer":"No. Inspection standards require inspectors to report possible foundation movement but say they are not required to report on the adequacy of any structural system or to provide engineering services.","url":"https://terrabrain.vercel.app/signs/doors-binding-or-tapered-gaps#faq-4","section":"signs","topic":"Doors binding, tapered gaps"},{"question":"Do you need a permit for foundation repair in Oklahoma?","answer":"It depends on the city. Oklahoma uses the 2024 IRC statewide, cities run their own permit offices, and the state does not license foundation repair.","url":"https://terrabrain.vercel.app/rules/codes-and-permits","section":"rules"},{"question":"Codes and permits: What is the statewide code?","answer":"The Oklahoma Uniform Building Code Commission adopts the IRC for one- and two-family homes. The 2024 edition with Oklahoma amendments took effect September 14, 2026, replacing the 2018 edition that had been effective since September 14, 2022.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#what-is-the-statewide-code","section":"rules","topic":"Codes and permits"},{"question":"Codes and permits: What are Oklahoma's foundation amendments?","answer":"The 2024 Oklahoma rule changes several Chapter 4 provisions: - R402.2: interior slabs and enclosed garage slabs do not need air-entrained concrete. - R403.1: two #4 reinforcing bars in all footings; #4 bars tie footings to stem walls at each corner and at most 6 feet apart, with 12 inches of embedment. - R403.1.6: ½-inch anchor bolts at most 6 feet apart and at least 7 inches into concrete; hand-driven cut or concrete nails are not approved. - R403.1.7.3 (foundation elevation): deleted. - R404.1.3.3.7.1.b: glass-fiber reinforcing bar allowed in foundation walls and footings up to 48 inches high.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#what-are-oklahoma-s-foundation-amendments","section":"rules","topic":"Codes and permits"},{"question":"Codes and permits: Is a permit needed for foundation repair?","answer":"Permit requirements are set and enforced locally, and published guidance differs by city: - Tulsa: the owner, contractor, architect or owner's agent may apply.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#is-a-permit-needed-for-foundation-repair","section":"rules","topic":"Codes and permits"},{"question":"Codes and permits: Does Oklahoma license foundation repair?","answer":"The Oklahoma Construction Industries Board licenses plumbers, electricians, mechanical contractors, home inspectors and building inspectors, and registers roofing contractors.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#does-oklahoma-license-foundation-repair","section":"rules","topic":"Codes and permits"},{"question":"Codes and permits: What building code applies to houses in Oklahoma?","answer":"The 2024 International Residential Code with Oklahoma amendments, adopted by the Oklahoma Uniform Building Code Commission, became the statewide minimum residential code on September 14, 2026.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#faq-1","section":"rules","topic":"Codes and permits"},{"question":"Codes and permits: Do I need a permit for foundation repair in Oklahoma?","answer":"It depends on the city. Tulsa, for example, takes repair permits in person and requires construction plans when damage is extensive or structural, so the local permit office is the authority for a specific job.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#faq-2","section":"rules","topic":"Codes and permits"},{"question":"Codes and permits: Does Oklahoma license foundation repair contractors?","answer":"The state Construction Industries Board licenses plumbing, electrical and mechanical trades, home and building inspectors, and registers roofing contractors; foundation repair is not one of the listed trades. Cities such as Oklahoma City require building contractor registration for permitted work.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#faq-3","section":"rules","topic":"Codes and permits"},{"question":"Codes and permits: How steep should the ground slope away from my house?","answer":"The residential code requires the ground to fall at least 6 inches within the first 10 feet from the foundation, or drains and swales where that is not possible.","url":"https://terrabrain.vercel.app/rules/codes-and-permits#faq-4","section":"rules","topic":"Codes and permits"},{"question":"Does chemical soil stabilization work on Oklahoma clay?","answer":"Oklahoma highway research found lime cuts swelling in ordinary clay but can cause severe heave in high-sulfate soil; two acid additives did not cut swelling.","url":"https://terrabrain.vercel.app/data/stabilization-research","section":"data"},{"question":"Why does this research matter to homeowners?","answer":"Chemical soil stabilization means mixing or injecting a material into clay to reduce its tendency to swell and shrink.","url":"https://terrabrain.vercel.app/data/stabilization-research#why-does-this-research-matter-to-homeowners","section":"data","topic":"Chemical stabilization research"},{"question":"Chemical stabilization research: What did lime, fly ash and kiln dust tests show?","answer":"A University of Oklahoma study (FHWA-OK-08-10) measured three-dimensional swell after curing for three Oklahoma soils.","url":"https://terrabrain.vercel.app/data/stabilization-research#what-did-lime-fly-ash-and-kiln-dust-tests-show","section":"data","topic":"Chemical stabilization research"},{"question":"Chemical stabilization research: Do acid-based additives work?","answer":"A 2013 University of Oklahoma study for ODOT (FHWA-OK-13-06) tested two commercial acid-based liquid additives, described as sulfonated oil products mixed with acid, on three Oklahoma clays: Lela clay (Kay County), Renfrow clay (Logan County) and Vernon soil.","url":"https://terrabrain.vercel.app/data/stabilization-research#do-acid-based-additives-work","section":"data","topic":"Chemical stabilization research"},{"question":"What are the limits of the research?","answer":"These studies tested road subgrade mixing and lab samples, not injection beneath existing houses; Results vary by soil; a treatment that works on low-sulfate Kingfisher soil behaved very differently on Vernon soil; Measured soil properties for many Oklahoma soils are listed in soil lab values.","url":"https://terrabrain.vercel.app/data/stabilization-research#what-are-the-limits-of-the-research","section":"data","topic":"Chemical stabilization research"},{"question":"Chemical stabilization research: Does lime reduce swelling in Oklahoma clay?","answer":"On low-sulfate soil it can. In Oklahoma research on Kingfisher soil, 3% lime cut swelling by about 95%, and 9% lime produced slight shrinkage instead of swell.","url":"https://terrabrain.vercel.app/data/stabilization-research#faq-1","section":"data","topic":"Chemical stabilization research"},{"question":"Chemical stabilization research: Can lime make clay swell more?","answer":"Yes, in sulfate-rich soil. Vernon soil from western Oklahoma, with 15,400 ppm sulfate, swelled 1,237% more after 3% lime was added, because the lime and sulfate formed the expansive mineral ettringite.","url":"https://terrabrain.vercel.app/data/stabilization-research#faq-2","section":"data","topic":"Chemical stabilization research"},{"question":"Chemical stabilization research: Do acid-based soil stabilizer products work on Oklahoma clay?","answer":"A 2013 University of Oklahoma study for the state DOT tested two acid-based additives on three Oklahoma clays and found no substantial strength gain, little change in plasticity and no reduction in swelling potential.","url":"https://terrabrain.vercel.app/data/stabilization-research#faq-3","section":"data","topic":"Chemical stabilization research"},{"question":"Chemical stabilization research: Has sulfate heave happened on an Oklahoma project?","answer":"Yes. In 2004, several miles of State Highway 412 near Woodward failed when lime-treated soil from a gypsum-rich borrow source heaved as ettringite formed.","url":"https://terrabrain.vercel.app/data/stabilization-research#faq-4","section":"data","topic":"Chemical stabilization research"},{"question":"Does chemical soil stabilization work on Oklahoma clay?","answer":"Lime can nearly eliminate swell in some Oklahoma soils but make sulfate-rich soils dramatically worse, so soil testing, especially for sulfates, comes first.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization","section":"repairs"},{"question":"What is chemical soil stabilization?","answer":"Expansive clay swells when wet and shrinks when dry. Most foundation repair works around it, by placing piers below the moving layer or by controlling water. Chemical stabilization tries to change the clay itself.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#what-is-chemical-soil-stabilization","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Chemical soil stabilization: What did Oklahoma research find?","answer":"The University of Oklahoma, working for the Oklahoma Department of Transportation, tested lime, fly ash and cement kiln dust on Oklahoma soils after curing:","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#what-did-oklahoma-research-find","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Chemical soil stabilization: What is the sulfate problem?","answer":"Ettringite is a calcium-aluminum-sulfate mineral that forms when lime, soluble sulfate (often from gypsum), aluminum from clay and water combine; it can swell up to 250% of its original volume.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#what-is-the-sulfate-problem","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Which Oklahoma soils are candidates?","answer":"Oklahoma State University testing found montmorillonite-dominated clay in western Oklahoma benchmark soils, with Kirkland showing volume change up to 73% and Bethany up to 66%.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#which-oklahoma-soils-are-candidates","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Chemical soil stabilization: What testing is needed before treatment?","answer":"Plasticity index and swell tests on samples from the depth to be treated; see soil testing and lab values; Soluble sulfate content, because of the ettringite reaction; Swell tests on treated and untreated samples, the comparison the Oklahoma studies used.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#what-testing-is-needed-before-treatment","section":"repairs","topic":"Chemical soil stabilization"},{"question":"What does chemical soil stabilization do?","answer":"It mixes or injects a chemical such as lime into expansive clay to reduce how much the clay swells and shrinks with moisture, treating the soil itself rather than bypassing it with piers.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#faq-1","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Chemical soil stabilization: Does lime work on Oklahoma clay?","answer":"In Oklahoma Department of Transportation research, lime cut swell sharply in Kingfisher soil, from 6.1 percent untreated to a net shrink of 2.8 percent at 9 percent lime. In a high-sulfate Vernon soil, 3 percent lime increased swell by 1,237 percent.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#faq-2","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Chemical soil stabilization: Why do sulfates matter for lime treatment?","answer":"Lime reacts with soluble sulfate, often from gypsum, and with aluminum from clay to form ettringite, a mineral that can swell to as much as 250 percent of its original volume. That reaction caused the 2004 failure of several miles of SH-412 near Woodward.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#faq-3","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Chemical soil stabilization: Do the Oklahoma lab results apply to injection under a house?","answer":"Not directly. The Oklahoma studies tested soils mixed with additives and compacted in the lab for highway subgrades, which is a different process from pressure injection into undisturbed soil under an existing foundation.","url":"https://terrabrain.vercel.app/repairs/chemical-soil-stabilization#faq-4","section":"repairs","topic":"Chemical soil stabilization"},{"question":"Does homeowners insurance cover foundation damage in Oklahoma?","answer":"Standard policies usually exclude settling or soil movement. Earthquake damage needs a separate endorsement, and flood policies exclude earth movement.","url":"https://terrabrain.vercel.app/rules/insurance-claims","section":"rules"},{"question":"Insurance and foundation claims: What do standard policies usually exclude?","answer":"The standard homeowners form's earth movement exclusion applies no matter what caused the movement, and an insurance coverage analysis applied it to a foundation cracked by drought. Policies also commonly carry a settling, cracking and bulging exclusion.","url":"https://terrabrain.vercel.app/rules/insurance-claims#what-do-standard-policies-usually-exclude","section":"rules","topic":"Insurance and foundation claims"},{"question":"Insurance and foundation claims: What if a plumbing leak is involved?","answer":"Courts are split on whether settlement caused by a plumbing leak falls under the settling exclusion: - Some courts applied the exclusion to leak-caused foundation movement, such as a 1996 federal case in Texas and a 1989 Oregon appeals case. - Others found the exclusion aimed at gradual, natural settlement and found coverage, such as a 1999 Colorado appeals case and a 1974 Florida appeals case.","url":"https://terrabrain.vercel.app/rules/insurance-claims#what-if-a-plumbing-leak-is-involved","section":"rules","topic":"Insurance and foundation claims"},{"question":"Insurance and foundation claims: How does earthquake coverage work in Oklahoma?","answer":"According to the Oklahoma Insurance Department: - Typical homeowner and renter policies do not cover earthquakes. - Coverage is sold as an endorsement or a stand-alone policy, though not every insurer offers it. - Deductibles are usually 5 to 10 percent of the insured value, with separate deductibles for the home, other structures and contents. - Most companies will not sell new earthquake coverage for 30 to 60 days after a quake. - Coverage may include costs to stabilize land under structures, but damage to the lot itself, such as sinkholes, is typically excluded, and some insurers exclude brick or stone veneer.","url":"https://terrabrain.vercel.app/rules/insurance-claims#how-does-earthquake-coverage-work-in-oklahoma","section":"rules","topic":"Insurance and foundation claims"},{"question":"Does flood insurance cover foundation damage?","answer":"The National Flood Insurance Program pays for direct physical loss by or from flood, but not for loss caused by earth movement, even when a flood causes that movement.","url":"https://terrabrain.vercel.app/rules/insurance-claims#does-flood-insurance-cover-foundation-damage","section":"rules","topic":"Insurance and foundation claims"},{"question":"Insurance and foundation claims: What documentation helps show the cause?","answer":"An elevation survey showing the pattern of movement; Dated photos and a crack log; Plumbing test results when a leak is suspected.","url":"https://terrabrain.vercel.app/rules/insurance-claims#what-documentation-helps-show-the-cause","section":"rules","topic":"Insurance and foundation claims"},{"question":"Insurance and foundation claims: What if a claim is disputed?","answer":"The Oklahoma Insurance Department's complaint process asks consumers to contact the insurer first, then file a signed Request for Assistance with copies of the policy and letters; the insurer has 30 days to respond to the department.","url":"https://terrabrain.vercel.app/rules/insurance-claims#what-if-a-claim-is-disputed","section":"rules","topic":"Insurance and foundation claims"},{"question":"Does homeowners insurance cover foundation cracks from soil movement?","answer":"Usually not. The standard homeowners form excludes earth movement, including soil expansion and contraction, regardless of cause, and policies commonly exclude settling and cracking of foundations.","url":"https://terrabrain.vercel.app/rules/insurance-claims#faq-1","section":"rules","topic":"Insurance and foundation claims"},{"question":"Insurance and foundation claims: Is earthquake damage covered in Oklahoma?","answer":"Not under a typical homeowners policy. Earthquake coverage is sold as an endorsement or a separate policy, usually with a deductible of 5 to 10 percent of the insured value.","url":"https://terrabrain.vercel.app/rules/insurance-claims#faq-2","section":"rules","topic":"Insurance and foundation claims"},{"question":"Does flood insurance pay for foundation settlement after a flood?","answer":"The National Flood Insurance Program excludes loss caused by earth movement even when a flood triggers it, and FEMA has upheld a denial where an engineer tied foundation cracks to long-term soil movement.","url":"https://terrabrain.vercel.app/rules/insurance-claims#faq-3","section":"rules","topic":"Insurance and foundation claims"},{"question":"What can I do if my foundation claim is denied?","answer":"You can ask the insurer to explain the decision, file a complaint with the Oklahoma Insurance Department, and in some cases use the department's free EAGLE mediation program if both sides agree.","url":"https://terrabrain.vercel.app/rules/insurance-claims#faq-4","section":"rules","topic":"Insurance and foundation claims"},{"question":"Does insurance cover slab leak foundation damage in Oklahoma?","answer":"A slab leak can raise or lower part of a house, but insurance treatment of leak-related settlement is unsettled, with courts split on the settling exclusion.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma","section":"rules"},{"question":"How do leaks move foundations?","answer":"On expansive clay, added water swells the soil, and slab-on-grade foundations on these soils are vulnerable to that volume change. A leak can swell the soil under one area and push up an interior part of the slab, called heave.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#how-do-leaks-move-foundations","section":"rules","topic":"Slab leaks and insurance"},{"question":"Slab leaks and insurance: What pipe materials were used in homes of each age?","answer":"House age helps estimate which materials are under the slab; see construction era by decade.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#what-pipe-materials-were-used-in-homes-of-each-age","section":"rules","topic":"Slab leaks and insurance"},{"question":"Slab leaks and insurance: How is a leak found?","answer":"Water meter check. Read the meter, use no water for two hours, then read it again; any change probably means a leak. This finds pressurized supply leaks, not drain leaks; Licensed plumber testing.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#how-is-a-leak-found","section":"rules","topic":"Slab leaks and insurance"},{"question":"How does insurance treat leak-related damage?","answer":"Earth movement and settling. The standard homeowners form excludes earth movement no matter the cause, and policies commonly exclude settling and cracking of foundations; Leak-caused settlement. Courts are split.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#how-does-insurance-treat-leak-related-damage","section":"rules","topic":"Slab leaks and insurance"},{"question":"Slab leaks and insurance: What are Oklahoma's claim-handling deadlines?","answer":"Under Oklahoma's Unfair Claims Settlement Practices Act, as summarized by a coverage law firm: - Insurers must respond within 30 days to communications that call for a response. - Insurers must acknowledge a claim within 30 days. - Insurers must accept or deny within 60 days after a properly executed proof of loss, or say within that time that more investigation is needed. - Investigations generally may not exceed 120 days absent specific fraud or arson indicators.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#what-are-oklahoma-s-claim-handling-deadlines","section":"rules","topic":"Slab leaks and insurance"},{"question":"Slab leaks and insurance: Can a plumbing leak cause foundation problems?","answer":"Yes. On expansive clay, water from a leak can swell the soil and raise part of a slab, and on sandy soils moving water can wash out support; one documented claim showed settlement concentrated at the footings nearest a leak.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#faq-1","section":"rules","topic":"Slab leaks and insurance"},{"question":"Slab leaks and insurance: How can I check for a water leak myself?","answer":"Read the water meter, use no water for two hours, then read it again; if the reading changed at all, there is probably a leak.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#faq-2","section":"rules","topic":"Slab leaks and insurance"},{"question":"Does homeowners insurance cover foundation damage from a slab leak?","answer":"It depends on the policy and the courts. Policies commonly exclude settling and cracking, and courts in different states have split on whether settlement caused by a plumbing leak is excluded.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#faq-3","section":"rules","topic":"Slab leaks and insurance"},{"question":"Slab leaks and insurance: Should plumbing be tested before or after foundation repair?","answer":"Both are common. Forensic engineering guidance recommends plumbing tests after any lifting or lowering of a foundation, and testing before repair helps show whether a leak is driving the movement.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#faq-4","section":"rules","topic":"Slab leaks and insurance"},{"question":"Slab leaks and insurance: How long does an Oklahoma insurer have to decide a claim?","answer":"Under Oklahoma's Unfair Claims Settlement Practices Act, an insurer must accept or deny within 60 days after a properly executed proof of loss, or tell the claimant within that time that more investigation is needed.","url":"https://terrabrain.vercel.app/rules/plumbing-leaks-and-insurance-oklahoma#faq-5","section":"rules","topic":"Slab leaks and insurance"},{"question":"Does insurance pay for Oklahoma earthquake foundation damage?","answer":"Oklahoma quake claims have been paid at a low rate: in 2014 about 100 were filed and eight paid, and masonry veneer and chimneys are often excluded.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law","section":"data"},{"question":"How active are earthquakes in Oklahoma?","answer":"In a 2008 summary, an Oklahoma Geological Survey geologist described four main seismic areas in the state: El Reno-Mustang, central Oklahoma, Love and Carter counties, and the Arkoma Basin. Typical magnitudes were 1.8 to 2.5, with focal depths generally under 3 miles.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#how-active-are-earthquakes-in-oklahoma","section":"data","topic":"Earthquake insurance claims"},{"question":"What did Oklahoma's larger earthquakes actually damage?","answer":"The magnitude 5.6 earthquake of November 2011, centered in Lincoln County about 45 miles east of Oklahoma City, buckled several roads including Highway 62, and chimneys collapsed through the roofs of some homes.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#what-did-oklahoma-s-larger-earthquakes-actually-damage","section":"data","topic":"Earthquake insurance claims"},{"question":"What did the 2015 Insurance Department bulletin say?","answer":"In March 2015 the Oklahoma Insurance Commissioner issued Earthquake Insurance Bulletin No. PC 2015-02. Its main points:","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#what-did-the-2015-insurance-department-bulletin-say","section":"data","topic":"Earthquake insurance claims"},{"question":"How often have Oklahoma earthquake claims been paid?","answer":"Separate earthquake coverage also became more common: about 10 to 15 percent of Oklahomans had it in 2016, up from about 2 percent in 2011, according to the Insurance Department.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#how-often-have-oklahoma-earthquake-claims-been-paid","section":"data","topic":"Earthquake insurance claims"},{"question":"Earthquake insurance claims: How have Oklahoma courts treated \"earth movement\" exclusions?","answer":"An earth movement exclusion is policy wording that removes coverage for damage caused by the ground shifting, settling or heaving. Oklahoma cases show the outcome can turn on exact policy wording and the cause of the movement:","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#how-have-oklahoma-courts-treated-earth-movement-exclusions","section":"data","topic":"Earthquake insurance claims"},{"question":"What does this mean for foundation-related claims?","answer":"Because insurers are expected to know a home's condition before coverage starts, records of that condition carry weight in a claim. Useful records include dated photos of brick, drywall and slab cracks, and an elevation survey showing how level the floors were.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#what-does-this-mean-for-foundation-related-claims","section":"data","topic":"Earthquake insurance claims"},{"question":"How many Oklahoma earthquake claims were paid in 2014?","answer":"The Oklahoma Insurance Commissioner reported about 100 earthquake claims filed in 2014, with only eight paid.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#faq-1","section":"data","topic":"Earthquake insurance claims"},{"question":"Can an insurer deny an earthquake claim as pre-existing damage?","answer":"A 2015 Oklahoma Insurance Department bulletin said that if an insurer denies a claim for pre-existing damage, the Commissioner expects it to have inspected the property before coverage began and kept current records of its condition.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#faq-2","section":"data","topic":"Earthquake insurance claims"},{"question":"Do Oklahoma earthquake policies cover brick veneer and chimneys?","answer":"Not always. The Insurance Department bulletin refers to the common exclusion of coverage for masonry veneer walls and chimneys, so policy wording should be checked.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#faq-3","section":"data","topic":"Earthquake insurance claims"},{"question":"Can an insurer deny a claim by saying the earthquake was man-made?","answer":"The 2015 bulletin told insurers not to deny claims based on an unsupported belief that quakes were caused by fracking or injection wells.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#faq-4","section":"data","topic":"Earthquake insurance claims"},{"question":"How many earthquake claims were paid after the 2016 Pawnee earthquake?","answer":"By early November 2016, 274 damage claims had been filed and four had been paid, totaling $24,232, according to figures reported from the Oklahoma Insurance Department.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#faq-5","section":"data","topic":"Earthquake insurance claims"},{"question":"Earthquake insurance claims: Does an earth movement exclusion apply when a broken pipe causes clay to swell?","answer":"Oklahoma rulings have gone both ways depending on policy wording. A 2009 federal appeals ruling on an Edmond home enforced the exclusion, while the Oklahoma Supreme Court in 2019 found a policy's exclusion ambiguous for a pipe rupture because it listed only natural events.","url":"https://terrabrain.vercel.app/data/earthquakes-claims-and-law#faq-6","section":"data","topic":"Earthquake insurance claims"},{"question":"How are bowing or cracked basement walls repaired?","answer":"Repairs strengthen, brace, anchor or replace the wall, paired with drainage, since soil pressure, swelling clay and trapped water cause the damage.","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair","section":"repairs"},{"question":"Basement wall repair: What does the damage look like?","answer":"Horizontal cracking along a mortar joint or at mid-height of a block wall, with the wall bowing inward (horizontal crack or inward bow); Cracks that let water in, the pattern described for Oklahoma clay; Seepage at cracks or at the joint between wall and floor, or white salt deposits left where water has moved through the masonry and evaporated (water at cove joint or efflorescence).","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair#what-does-the-damage-look-like","section":"repairs","topic":"Basement wall repair"},{"question":"What repair methods are used?","answer":"Plain-English definitions of the methods named in repair proposals:","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair#what-repair-methods-are-used","section":"repairs","topic":"Basement wall repair"},{"question":"What water control goes with wall repair?","answer":"Footing drains: required around concrete or masonry walls that retain earth and enclose usable below-grade space, set at or below the top of the footing and discharged by gravity or pump; Drain construction: gravel at least 1 ft beyond the footing and 6 in above it, or perforated pipe on 2 in of washed gravel with 6 in of cover and a filter membrane; Waterproofing: where severe soil-water conditions exist, a waterproofing membrane rather than dampproofing.","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair#what-water-control-goes-with-wall-repair","section":"repairs","topic":"Basement wall repair"},{"question":"What causes a basement wall to bow inward?","answer":"Sideways pressure from the soil behind it. The residential code assigns inorganic clays the highest design soil pressure of the common soil groups, and swelling clay and trapped water add to that load.","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair#faq-1","section":"repairs","topic":"Basement wall repair"},{"question":"What are the main ways to repair a bowing basement wall?","answer":"Repair methods fall into four groups: strengthening the wall face with bonded carbon fiber straps, bracing it from inside with steel beams, anchoring it to the soil outside with wall anchors or helical tiebacks, and excavating to rebuild it. Each is normally paired with water control.","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair#faq-2","section":"repairs","topic":"Basement wall repair"},{"question":"Why does basement wall repair include drainage?","answer":"Water in the backfill adds hydrostatic pressure to the soil load and leaks through cracks. The code requires footing drains around below-grade walls that enclose usable space and waterproofing where a high water table is known.","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair#faq-3","section":"repairs","topic":"Basement wall repair"},{"question":"Can a home inspector tell me how to fix a bowed wall?","answer":"No. Inspection standards require inspectors to report signs of foundation movement and water penetration, but not to provide engineering services or judge the adequacy of structural components.","url":"https://terrabrain.vercel.app/repairs/basement-wall-repair#faq-4","section":"repairs","topic":"Basement wall repair"},{"question":"How are foundation problems handled in an Oklahoma home sale?","answer":"They surface through the seller's disclosure form, the buyer's inspection, the contract's repair window and lender rules; the 2026 form asks about past repairs.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma","section":"rules"},{"question":"Buying or selling with foundation issues: What does Oklahoma's seller disclosure law require?","answer":"The Residential Property Condition Disclosure Act (60 O.S. §831 et seq.) covers residential property with one or two dwelling units.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#what-does-oklahoma-s-seller-disclosure-law-require","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Buying or selling with foundation issues: What does the 2026 disclosure form ask?","answer":"Questions on the official form that touch foundations and drainage include:","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#what-does-the-2026-disclosure-form-ask","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Buying or selling with foundation issues: What do home inspections cover?","answer":"Oklahoma home inspectors are licensed by the Construction Industries Board, need 90 hours of training and at least $50,000 in general liability insurance.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#what-do-home-inspections-cover","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Buying or selling with foundation issues: What is the sale contract timeline?","answer":"On the 2026 state Residential Sale Contract: - The buyer's inspection period is 10 days after the Time Reference Date if left blank. - Buyers may use licensed home inspectors, architects and registered professional engineers; a structural inspection is a listed option. - Within 24 hours after the period ends, the buyer either cancels or delivers a repair list (Treatments, Repairs and Replacements). - The parties then have 7 days, if left blank, to negotiate.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#what-is-the-sale-contract-timeline","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Buying or selling with foundation issues: What do lenders require?","answer":"Conventional (Fannie Mae). Deficiencies affecting safety, soundness or structural integrity make the appraisal \"subject to\" repair. A property rated C6 is ineligible until repaired.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#what-do-lenders-require","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Do Oklahoma sellers have to disclose foundation repairs?","answer":"Sellers who complete the state disclosure form must report known conditions, and the 2026 form asks directly whether the seller is aware of any previous foundation repairs. A seller who never occupied the home and knows of no defects may use a disclaimer form instead.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#faq-1","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Buying or selling with foundation issues: How long does a buyer have to sue over an undisclosed defect in Oklahoma?","answer":"Under the Residential Property Condition Disclosure Act, a suit must be filed within two years after the transfer, and the remedy is actual damages, including the cost of repair.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#faq-2","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Will a home inspector tell me what is wrong with the foundation?","answer":"Oklahoma inspectors must describe indicators of foundation or structural movement, but they are not required to determine the cause or the repair method, and they do not perform engineering.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#faq-3","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Buying or selling with foundation issues: How long is the inspection period in an Oklahoma home purchase?","answer":"On the 2026 state contract form, it is 10 days after the Time Reference Date if the blank is left empty, followed by 7 days to negotiate repairs if the buyer submits a repair list.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#faq-4","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"Can I get a mortgage on a house with foundation settlement?","answer":"Lenders treat structural problems as a loan condition. Fannie Mae requires proof that abnormal settlement was corrected or a professional report that it poses no structural threat, and FHA appraisal guidance flags foundation damage for further inspection or repair.","url":"https://terrabrain.vercel.app/rules/real-estate-disclosure-and-inspections-foundation-issues-in-oklahoma#faq-5","section":"rules","topic":"Buying or selling with foundation issues"},{"question":"How are interior slab piers installed by tunneling or coring?","answer":"Crews reach soil under the slab interior by tunneling from outside or coring through the floor. Interior piers address settlement only, not a heaved center.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core","section":"repairs"},{"question":"Interior piers, tunnel or core: How do crews reach the soil?","answer":"Coring means cutting a cylinder out of concrete with a diamond-tipped drill. A tunnel here is a crawl-height excavation under the slab.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#how-do-crews-reach-the-soil","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"Where do interior piers go?","answer":"Slab foundations can have interior footings under bearing walls, cast with the slab; in Seismic Design Categories D0 to D2 the code requires those footings to extend at least 12 in below the top of the slab.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#where-do-interior-piers-go","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"Interior piers, tunnel or core: What do Oklahoma install records show?","answer":"Steel push piers rely on the weight above them to drive the pier down. Records from Oklahoma steel push pier installations show a clear difference between piers at the slab and at the perimeter footing:","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#what-do-oklahoma-install-records-show","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"What can interior piers not do?","answer":"Interior piers lift or hold up; they cannot pull a slab down.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#what-can-interior-piers-not-do","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"How do floating slabs and interior walls affect them?","answer":"Engineering guidance for swelling soils notes that floating slabs are kept isolated from bearing walls, columns, stairs and utilities and that some cracking should be expected.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#how-do-floating-slabs-and-interior-walls-affect-them","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"Can interior piers be used in post-tensioned slabs?","answer":"Oklahoma's 2024 code adoption requires post-tensioned slabs on grade to carry a label on the electrical panel door. Post-tensioned slabs contain tendons, steel cables stressed after the pour, so the slab type is identified before coring; see post-tensioned slabs.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#can-interior-piers-be-used-in-post-tensioned-slabs","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"What are interior piers?","answer":"They are piers placed under the inside of a slab foundation, beneath interior beams or settled floor areas, rather than along the outside edge. Crews reach the soil either by tunneling under the slab from outside or by cutting a hole through the floor.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#faq-1","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"Can interior piers fix a hump in the middle of my floor?","answer":"No. Piers push up; they cannot pull a raised center down. A hump caused by swelling clay or a leak under the middle of the slab is the opposite problem from settlement.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#faq-2","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"Do interior piers go as deep as exterior piers?","answer":"In Oklahoma installation records, piers pushed at the slab stopped shallower and at lower pressure than piers at the perimeter footing: about 8 to 11 feet at 4,000 to 5,000 psi, compared with 13 to 17 feet at 7,000 to 8,000 psi.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#faq-3","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"Interior piers, tunnel or core: Is there anything special about coring a post-tensioned slab?","answer":"Post-tensioned slabs contain stressed steel tendons. Oklahoma's 2024 code adoption requires post-tensioned slabs on grade to be labeled at the electrical panel door, which identifies the slab type before any cutting.","url":"https://terrabrain.vercel.app/repairs/interior-piers-tunnel-or-core#faq-4","section":"repairs","topic":"Interior piers, tunnel or core"},{"question":"How are manufactured homes set on piers in Oklahoma?","answer":"They rest on a steel chassis carried by concrete-block piers on small pads, held by anchors. Shallow pads ride up and down as Oklahoma clay swells and shrinks.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers","section":"foundations"},{"question":"Manufactured home piers: How does the support system work?","answer":"Chassis: two or more steel I-beams running the length of each section; Piers: stacks of 8 x 8 x 16 inch concrete blocks under the I-beams, with hollow cells set vertically; Pads (footings): precast or poured concrete, or solid blocks, under each pier.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#how-does-the-support-system-work","section":"foundations","topic":"Manufactured home piers"},{"question":"Manufactured home piers: Who sets the installation rules in Oklahoma?","answer":"Installation of new homes, including site preparation, must follow HUD's Model Manufactured Home Installation Standards (24 CFR Part 3285) or manufacturer instructions approved by a design approval agency.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#who-sets-the-installation-rules-in-oklahoma","section":"foundations","topic":"Manufactured home piers"},{"question":"Manufactured home piers: What are the key numbers in the rules?","answer":"Under both standards, organic material such as grass and loose topsoil comes out from under each support, and HUD requires a registered professional for peat, organic clays or uncompacted fill.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#what-are-the-key-numbers-in-the-rules","section":"foundations","topic":"Manufactured home piers"},{"question":"Why do piers move on Oklahoma clay?","answer":"Under the generic standard, pads rest on firm undisturbed soil (or fill compacted to at least 90 percent) once grass and loose topsoil are removed, so they bear on the soil layer that changes moisture most with the seasons.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#why-do-piers-move-on-oklahoma-clay","section":"foundations","topic":"Manufactured home piers"},{"question":"How are manufactured home piers repaired?","answer":"Re-leveling with shims resets the home on the same shallow pads. Supports that reach below the moving layer, such as helical piers, steel adjustable piers on new footings, and site drainage are covered under crawl space repair, drainage solutions and crawl space encapsulation.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#how-are-manufactured-home-piers-repaired","section":"foundations","topic":"Manufactured home piers"},{"question":"What rules govern setting a manufactured home in Oklahoma?","answer":"New homes must be installed to HUD's Model Manufactured Home Installation Standards (24 CFR Part 3285) or DAPIA-approved manufacturer instructions. Used homes may follow the manufacturer's manual, the state's generic standard, or an engineer's or architect's plan, and the installer must be licensed by the state commission.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#faq-1","section":"foundations","topic":"Manufactured home piers"},{"question":"How far apart can piers be under a used manufactured home?","answer":"Under Oklahoma's generic standard for previously occupied homes, piers go under each main frame member no more than 6 feet on center, with end piers within 2 feet of the frame ends.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#faq-2","section":"foundations","topic":"Manufactured home piers"},{"question":"What soil bearing value is assumed for manufactured home footings?","answer":"Oklahoma's generic standard assumes at least 1,500 pounds per square foot unless testing shows otherwise. HUD's table rates high-plasticity clays at 1,000 pounds per square foot.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#faq-3","section":"foundations","topic":"Manufactured home piers"},{"question":"How much can shims be used to level a manufactured home?","answer":"Both HUD and Oklahoma rules call for nominal 4 by 6 by 1 inch shims used in pairs and driven tight, taking up no more than 1 inch of height.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#faq-4","section":"foundations","topic":"Manufactured home piers"},{"question":"Why does a manufactured home go out of level on clay?","answer":"The pier footings sit near the surface, inside the zone where clay shrinks and swells with the seasons, so individual piers can rise or drop at different times.","url":"https://terrabrain.vercel.app/foundations/manufactured-homes-on-piers#faq-5","section":"foundations","topic":"Manufactured home piers"},{"question":"How are sagging crawl space floors repaired?","answer":"Crawl space repair adds supports on proper footings, shims, added beams, reinforced joists and new sill plates, designed to be adjusted as Oklahoma clay moves.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair","section":"repairs"},{"question":"What gets repaired in a crawl space?","answer":"Adjustable supports are steel posts with a threaded section that lets the height be changed after installation, set on a concrete footing or on a pier.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#what-gets-repaired-in-a-crawl-space","section":"repairs","topic":"Crawl space repair"},{"question":"Crawl space repair: Why do interior supports move in Oklahoma?","answer":"Seasonal moisture change in clay can extend from 3 to 40 ft deep, and lightly loaded supports in that zone can be lifted when clay swells in the wet season, then lose grip and drop when it shrinks in the dry season.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#why-do-interior-supports-move-in-oklahoma","section":"repairs","topic":"Crawl space repair"},{"question":"Crawl space repair: How are shims, caps and anchor bolts used?","answer":"Shim limits: Oklahoma installation records cap shim stacks at no more than four per support; Manufactured homes: HUD's standard calls for 4 x 6 x 1 in shims used in pairs and driven tight, occupying no more than 1 in of height, with pier caps of solid concrete or masonry at least 4 in thick, lumber at least 2 in nominal, or corrosion-protected steel at least 1/2 in; Sill anchoring: sill plates are held by anchor bolts at least 1/2 in in diameter, no more than 6 ft apart and embedded at least 7 in, with a bolt within 12 in of each end.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#how-are-shims-caps-and-anchor-bolts-used","section":"repairs","topic":"Crawl space repair"},{"question":"What moisture work goes with structural repair?","answer":"Structural repair in a damp crawl space is paired with moisture work such as: - Removing vegetation and organic debris from the crawl floor, which the code requires. - Covering the ground with a vapor retarder; with a Class I retarder, required vent area drops from 1 sq ft per 150 sq ft to 1 per 1,500. - Correcting grade or adding drainage where groundwater rises within 6 in of the finished floor or surface water drains poorly. - Closing the crawl space as an unvented space under the code's conditions; see crawl space encapsulation.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#what-moisture-work-goes-with-structural-repair","section":"repairs","topic":"Crawl space repair"},{"question":"Crawl space repair: What access and safety issues apply?","answer":"The code requires crawl space access openings of at least 18 x 24 in through a floor or 16 x 24 in through a wall.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#what-access-and-safety-issues-apply","section":"repairs","topic":"Crawl space repair"},{"question":"Why are re-checks needed after repair?","answer":"Because clay keeps cycling with the seasons, adjustable supports are re-checked and re-shimmed as needed. Over-correction after a drought lift is covered under over-lift heave after drought lift, and ongoing readings under the monitoring program.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#why-are-re-checks-needed-after-repair","section":"repairs","topic":"Crawl space repair"},{"question":"How are sagging floors over a crawl space fixed?","answer":"The floor is jacked back toward level and re-supported, usually with new or added supports on proper footings, new shims, added beams under weak spans, or joists reinforced by fastening new lumber alongside them.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#faq-1","section":"repairs","topic":"Crawl space repair"},{"question":"Why do wood shims fail in a crawl space?","answer":"Wood in contact with or near soil or masonry absorbs moisture and is exposed to decay and termites, which is why inspectors report wood-to-soil contact as a defect. Crushed or rotted shims let the beam drop onto the pier.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#faq-2","section":"repairs","topic":"Crawl space repair"},{"question":"Will interior piers keep moving after repair in Oklahoma clay?","answer":"They can. Shallow pads under interior supports sit in clay that shrinks and swells with the seasons, so adjustable supports and periodic re-checks are part of many crawl space repairs.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#faq-3","section":"repairs","topic":"Crawl space repair"},{"question":"Crawl space repair: How many shims can be stacked on one support?","answer":"Oklahoma installation records cap shim stacks at four per support. For manufactured homes, HUD's installation standard calls for 4 by 6 by 1 inch shims used in pairs, taking up no more than 1 inch.","url":"https://terrabrain.vercel.app/repairs/crawl-space-repair#faq-4","section":"repairs","topic":"Crawl space repair"},{"question":"How are under-slab plumbing leaks found and repaired?","answer":"Supply leaks are found with a water-meter check and drain leaks with a hydrostatic test and camera; in Oklahoma the repair is licensed plumbing work.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair","section":"repairs"},{"question":"Why do plumbing leaks matter for foundations?","answer":"Most Oklahoma homes built on a slab have water supply pipes and sewer drains running in the soil under the concrete. When one leaks, it wets the clay in one area.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#why-do-plumbing-leaks-matter-for-foundations","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"How are supply leaks detected?","answer":"Pressurized water lines leak constantly, so the water meter is the first check.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#how-are-supply-leaks-detected","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"How are drain and sewer leaks tested?","answer":"Drain lines are not under pressure, so they do not move the meter. A hydrostatic test is used instead:","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#how-are-drain-and-sewer-leaks-tested","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: What are the repair options?","answer":"Once a leak is located, the plumber's options range from repairing a single section through the slab, to rerouting a line around the slab, to lining or replacing longer runs of pipe. The choice depends on the pipe material, its age and how many leaks the testing finds.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#what-are-the-repair-options","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"Who may repair leaks in Oklahoma?","answer":"Oklahoma's plumbing rules state that no person or firm may perform plumbing work without first obtaining the appropriate license or registration.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#who-may-repair-leaks-in-oklahoma","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: What ongoing checks help?","answer":"A foundation maintenance guide suggests checking for dripping faucets, air-conditioner condensate drips (especially from the overflow line) and stoppages, and fixing local moisture sources as soon as possible.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#what-ongoing-checks-help","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: How can I tell if I have a water supply leak?","answer":"Read the water meter, use no water for two hours, then read it again. EPA says any change in the reading during that time probably means a leak.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#faq-1","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"Under-slab plumbing leaks: What is a hydrostatic test on a sewer line?","answer":"The main drain is plugged at a cleanout, the under-slab drain system is filled with water to slab level, and the level is watched for about 15 minutes. A drop in the water level suggests a leak, which is then located with a camera and isolation testing.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#faq-2","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"Can a plumbing leak cause foundation movement?","answer":"Yes. Water leaking under a slab on expansive clay changes the soil moisture, which can make the soil swell and cause uneven movement and stress in the foundation, according to engineering research.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#faq-3","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"Do I need a licensed plumber in Oklahoma to repair a leak under my slab?","answer":"Oklahoma's plumbing rules say no person or firm may perform plumbing work without the appropriate license or registration from the Construction Industries Board.","url":"https://terrabrain.vercel.app/repairs/plumbing-leak-detection-and-repair#faq-4","section":"repairs","topic":"Under-slab plumbing leaks"},{"question":"How can Oklahoma Mesonet soil moisture data explain foundations?","answer":"The Oklahoma Mesonet is a free statewide network reporting soil moisture. Its shallow readings show whether ground is drier or wetter than usual, as trends.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros","section":"guides"},{"question":"What is the Oklahoma Mesonet?","answer":"The Mesonet was officially commissioned on January 1, 1994, and is a joint project of the University of Oklahoma and Oklahoma State University, operated by the Oklahoma Climatological Survey. The current network has 120 stations.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros#what-is-the-oklahoma-mesonet","section":"guides","topic":"Using Mesonet data"},{"question":"What soil moisture data does it report?","answer":"A few practical notes from the sources: - Soil moisture can't be measured when the ground is frozen, so winter maps can have gaps. - The rate at which soil moisture falls reflects how hot and dry the air is; it drops faster in hot, dry spells. - Comparing depths after a rain shows how deep the water soaked in.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros#what-soil-moisture-data-does-it-report","section":"guides","topic":"Using Mesonet data"},{"question":"How does Mesonet data connect to foundations?","answer":"Expansive clay swells when it gets wet and shrinks when it dries, and uneven moisture under a slab causes differential movement, meaning one part of the house moves more than another.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros#how-does-mesonet-data-connect-to-foundations","section":"guides","topic":"Using Mesonet data"},{"question":"What is the Oklahoma Mesonet?","answer":"It is a statewide network of 120 automated weather stations run jointly by the University of Oklahoma and Oklahoma State University. Stations are in all 77 counties, about 18 miles apart on average.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros#faq-1","section":"guides","topic":"Using Mesonet data"},{"question":"How deep does the Mesonet measure soil moisture?","answer":"Most sites have sensors at 2, 4, 10 and 24 inches (5, 10, 25 and 60 cm) below the surface.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros#faq-2","section":"guides","topic":"Using Mesonet data"},{"question":"Using Mesonet data: What does the fractional water index mean?","answer":"It is a 0-to-1 scale of soil wetness. A value near 0 means the soil is about as dry as the sensor can read, and a value near 1 means it is about as wet as the sensor can read.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros#faq-3","section":"guides","topic":"Using Mesonet data"},{"question":"Does Mesonet soil moisture tell me how deep my foundation soil is drying?","answer":"Only partly. The deepest standard sensor is about 2 feet down, while seasonal moisture change under houses on clay can extend many feet deeper, so the readings show the trend rather than conditions at pier depth.","url":"https://terrabrain.vercel.app/guides/mesonet-for-foundation-pros#faq-4","section":"guides","topic":"Using Mesonet data"},{"question":"How deep did steel piers go across a large Tulsa apartment complex?","answer":"Across 396 logged piers at a 34-building Tulsa complex, refusal depth ranged 2 to 40 ft, median 12 ft, at a median 9,000 psi driving pressure.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths","section":"case-studies"},{"question":"Tulsa apartment pier depths: What did the buildings show?","answer":"The engineer's drawings marked pier locations and foam-injection areas building by building, but did not include a written narrative, soil borings or a stated cause.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#what-did-the-buildings-show","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"Tulsa apartment pier depths: What did the engineer find was causing it?","answer":"No cause was written up. Standard notes on every sheet called for gutters on all eaves and stated that better drainage around each building would improve structural stability.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"Tulsa apartment pier depths: What repair was specified?","answer":"469 galvanized steel push piers at exterior footings, hydraulically driven to refusal at bedrock; plan spacing typically 3 to 5 ft, with some 6 to 7 ft spans.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#what-repair-was-specified","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"Tulsa apartment pier depths: What happened on the job?","answer":"Work ran in five phases from September 2025 into 2026. Of 469 planned piers, 396 have both a logged depth and pressure. Buildings that first needed siding or wall demolition for access are the ones with missing logs.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#what-happened-on-the-job","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"Tulsa apartment pier depths: What does this case show about Oklahoma foundations?","answer":"Depth to a pier-stopping layer is not uniform even within one property.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"Did piers on the same site reach refusal at the same depth?","answer":"No. Logged depths ran from 2 ft to 40 ft. Phase medians ranged from 10 to 20 ft, and one building's piers ranged from 7 to 40 ft.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#faq-1","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"Did deeper piers take more pressure?","answer":"Hardly. Across 396 piers the correlation between depth and logged pressure was about r = -0.06; pressure tracked work phase more than depth.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#faq-2","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"Tulsa apartment pier depths: What did the engineer point to as the cause?","answer":"No written cause was given, but every drawing called for gutters and better drainage, and one building near a retaining wall was described as subsiding from bad site drainage and uncontrolled roof water.","url":"https://terrabrain.vercel.app/case-studies/tulsa-apartment-complex-steel-pier-depths#faq-3","section":"case-studies","topic":"Tulsa apartment pier depths"},{"question":"How deep do foundation piers need to go in Oklahoma shale?","answer":"Shale weathers top-down into clay; piers aim for firmer material below the shrink-swell layers, and Oklahoma push pier records run about 8 to 16 feet.","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata","section":"guides"},{"question":"What does the shale weathering profile look like?","answer":"From the surface down, a typical shale profile looks like this:","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata#what-does-the-shale-weathering-profile-look-like","section":"guides","topic":"Shale weathering and bearing"},{"question":"Shale weathering and bearing: Where does the active zone sit?","answer":"The active zone, the depth of soil whose moisture changes seasonally, mostly lies in the clay and weathered layers. At four studied Houston clay sites it was about 8–10 feet before the 2011 drought and 10–12 feet during it.","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata#where-does-the-active-zone-sit","section":"guides","topic":"Shale weathering and bearing"},{"question":"Why does bearing depth matter for each pier type?","answer":"Steel push piers are driven until they reach a layer that resists the load; the depth where that happens is the bearing depth; Pressed concrete piles rely on a mix of end bearing and side friction, so stiff, dry clay can produce resistance at shallower depth during drought; Helical piers are screwed in, and installation torque is used to estimate capacity.","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata#why-does-bearing-depth-matter-for-each-pier-type","section":"guides","topic":"Shale weathering and bearing"},{"question":"What is a bearing stratum?","answer":"It is the soil or rock layer strong enough to carry a foundation's load without settling. For repair piers, it is the layer the pier is driven or drilled down to.","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata#faq-1","section":"guides","topic":"Shale weathering and bearing"},{"question":"Shale weathering and bearing: How deep do foundation piers go in Tulsa?","answer":"Oklahoma steel push pier installation records show typical depths of about 8 to 16 feet, with a median of about 12 feet in Tulsa. Depth at any one house depends on its soil and rock.","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata#faq-2","section":"guides","topic":"Shale weathering and bearing"},{"question":"Shale weathering and bearing: Why does it matter if a pier stops in dry clay?","answer":"Clay within the active zone changes volume with moisture. A pier that reaches resistance in stiff, dry clay during a drought may still be in soil that swells or softens when it rewets.","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata#faq-3","section":"guides","topic":"Shale weathering and bearing"},{"question":"Shale weathering and bearing: What is the difference between soft and hard rock in soil surveys?","answer":"USDA soil descriptions call the top of soft, weathered rock that can still be dug a paralithic contact, and the top of hard rock a lithic contact.","url":"https://terrabrain.vercel.app/guides/shale-weathering-and-bearing-strata#faq-4","section":"guides","topic":"Shale weathering and bearing"},{"question":"How deep does Oklahoma soil dry out during drought?","answer":"Oklahoma Mesonet research puts the active zone of seasonal moisture change at about 0.5 to 4 meters (1.6 to 13 feet), depending on soil and climate.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth","section":"data"},{"question":"What is the active zone?","answer":"Clay soil swells as it takes on water and shrinks as it dries. Near the surface, rain, heat and plants change soil moisture all year. Deeper down, moisture stays nearly constant.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#what-is-the-active-zone","section":"data","topic":"Active zone depth"},{"question":"How deep is the active zone in Oklahoma?","answer":"An Oklahoma State University study combined field measurements from the Oklahoma Mesonet and the U.S. Department of Energy's Atmospheric Radiation Measurement network with modeling. Its findings:","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#how-deep-is-the-active-zone-in-oklahoma","section":"data","topic":"Active zone depth"},{"question":"Active zone depth: How do cracks carry drying deeper?","answer":"When clay shrinks it cracks, and open cracks let air and heat reach soil far below the surface. NRCS Official Series Descriptions record this for Oklahoma-area clays:","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#how-do-cracks-carry-drying-deeper","section":"data","topic":"Active zone depth"},{"question":"Active zone depth: What do Mesonet drought records show?","answer":"D-levels come from the U.S. Drought Monitor: D2 is severe, D3 extreme and D4 exceptional drought. For year-by-year history, see drought and wet years, and for how to read live soil moisture, see Mesonet for foundation pros.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#what-do-mesonet-drought-records-show","section":"data","topic":"Active zone depth"},{"question":"How do pier depths compare to the active zone?","answer":"Oklahoma steel push pier installation records show piers in Tulsa typically reaching 8 to 16 feet, with a median of about 12 feet. That is deeper than most of the 1.6 to 13 foot active zone range estimated for the state.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#how-do-pier-depths-compare-to-the-active-zone","section":"data","topic":"Active zone depth"},{"question":"What is the active zone in Oklahoma soil?","answer":"The active zone is the upper layer of soil whose moisture, and therefore volume, changes with the seasons. An Oklahoma State University study estimated it at roughly 0.5 to 4 meters (about 1.6 to 13 feet) depending on soil and climate.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#faq-1","section":"data","topic":"Active zone depth"},{"question":"Active zone depth: How deep did soil dry out in the 2022 Oklahoma drought?","answer":"The Oklahoma Mesonet measured critically dry soils down to at least 32 inches in September 2022, when about 64% of the state was in extreme or exceptional drought.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#faq-2","section":"data","topic":"Active zone depth"},{"question":"Why do cracks matter for drying depth?","answer":"Open shrinkage cracks let air and heat reach deeper soil. NRCS descriptions of some Oklahoma clay soils record cracks more than 30 inches deep during dry periods.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#faq-3","section":"data","topic":"Active zone depth"},{"question":"Do piers in Tulsa go below the active zone?","answer":"Oklahoma installation records show steel push piers in Tulsa typically reaching 8 to 16 feet, with a median of about 12 feet, which is deeper than most of the estimated active zone range.","url":"https://terrabrain.vercel.app/data/active-zone-and-drought-depth#faq-4","section":"data","topic":"Active zone depth"},{"question":"How deep is bedrock in Tulsa and Oklahoma City?","answer":"Public borings show rock about 9 to 15 feet under upland shale in Tulsa; in Oklahoma City, Hennessey shale ran 2 to 41 feet and Garber sandstone 20 to 95.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc","section":"data"},{"question":"Depth to rock, Tulsa and OKC: What do these boring numbers mean?","answer":"A boring is a test hole drilled by a geotechnical engineer to log soil and rock. These reports separate two depths:","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#what-do-these-boring-numbers-mean","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"What do Tulsa metro borings show?","answer":"Nine borings for a sewer project found weathered rock at 1 to 8 feet and competent shale or limestone at 4 to 14.5 feet.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#what-do-tulsa-metro-borings-show","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"Depth to rock, Tulsa and OKC: What do Oklahoma City metro borings show?","answer":"The Hennessey unit is red clay shale and mudstone. Depth to bedrock varied widely across three structures:","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#what-do-oklahoma-city-metro-borings-show","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"Depth to rock, Tulsa and OKC: What do the summary statistics show?","answer":"Calculated from the borings above (drilled borings that reached rock, each counted once):","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#what-do-the-summary-statistics-show","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"How do rock depths compare with pier depths?","answer":"Oklahoma steel push pier installation records show typical pier depths of 8 to 16 feet, with a median of about 12 feet in Tulsa. That sits close to the Tulsa boring medians above.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#how-do-rock-depths-compare-with-pier-depths","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"Depth to rock, Tulsa and OKC: What are the limits of this data?","answer":"Highway and sewer borings are often on low ground, cuts or fill, so a hilltop lot may be shallower; Reports sometimes conflict between their summary tables and boring logs; the original PDF is the authority; Rock depth can change sharply over short distances, as the Bridge C borings show.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#what-are-the-limits-of-this-data","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"How deep is rock under Tulsa?","answer":"In public drilled borings on upland shale in Tulsa reviewed here, competent rock was found at a median of about 14 feet, with most between about 9.5 and 14.5 feet. Two borings for one retaining wall went 30 and 35 feet without reaching rock.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#faq-1","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"How deep is rock in Oklahoma City?","answer":"It varies with the bedrock unit. Borings in Hennessey shale at the I-35/I-240 interchange hit bedrock between 2 and 41 feet, while borings in Garber sandstone at I-35 and Waterloo Road reached competent rock at 20.5 to 95 feet.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#faq-2","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"How deep do steel push piers go in Tulsa?","answer":"Oklahoma installation records show typical pier depths of about 8 to 16 feet, with a median near 12 feet in Tulsa, which is close to the depth of weathered and competent shale in nearby borings.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#faq-3","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"Why do borings close together show different rock depths?","answer":"Bedrock surfaces are uneven, and alluvium (creek-deposited soil) fills old channels. One Oklahoma City bridge site had bedrock at 17.5 feet in one boring and 41 feet in another.","url":"https://terrabrain.vercel.app/data/borings-depth-to-rock-in-tulsa-and-okc#faq-4","section":"data","topic":"Depth to rock, Tulsa and OKC"},{"question":"How deep is rock under Tulsa and Oklahoma City?","answer":"In upland Tulsa, rock is often 2 to 15 feet down; near creeks and the river, 20 to 35 feet or more. South of OKC, borings hit shale at 15.5 to 25 feet.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings","section":"data"},{"question":"Why does depth to rock matter?","answer":"Rock depth controls how deep foundation piers may go and whether they end on rock or on friction in dense soil. Bedrock here means shale, sandstone or limestone below the soil. \"Weathered\" rock has partly broken down; \"competent\" rock is hard enough that drilling stalls.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#why-does-depth-to-rock-matter","section":"data","topic":"Depth to rock from borings"},{"question":"Depth to rock from borings: What do Tulsa city reports show?","answer":"Strength is reported as unconfined compressive strength (UCS), the pressure a rock core takes before it crushes.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#what-do-tulsa-city-reports-show","section":"data","topic":"Depth to rock from borings"},{"question":"What do borings show in central Oklahoma?","answer":"A state maintenance and residency facility study reported competent shale (standard penetration test refusal) at 15.5 to 25 feet. Above the rock were lean to fat clays, with plasticity index up to 41, that the report classified as expansive, over very weathered shale.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#what-do-borings-show-in-central-oklahoma","section":"data","topic":"Depth to rock from borings"},{"question":"What do borings show about groundwater?","answer":"Three east Tulsa borings had water at 7 to 9.5 feet at the end of drilling, and groundwater was not observed in four of the nine borings; The 91st St creek-side borings had water at 13.5 to 15 feet; the upland borings were dry; Water perched on top of rock is common; see groundwater and perched water.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#what-do-borings-show-about-groundwater","section":"data","topic":"Depth to rock from borings"},{"question":"Is bedrock shallow in Tulsa?","answer":"On many upland sites it is. City of Tulsa reports show shale as shallow as 15 to 23 inches below pavement in one east Tulsa neighborhood and competent rock within 4 to 14.5 feet at borings for two east Tulsa utility projects.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#faq-1","section":"data","topic":"Depth to rock from borings"},{"question":"Why is rock deeper near the Arkansas River?","answer":"River and creek deposits fill in over the shale. Along the Arkansas River in Tulsa County, shale is generally about 5 to 10 feet below the river bottom but 20 to 30 feet below the banks.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#faq-2","section":"data","topic":"Depth to rock from borings"},{"question":"Depth to rock from borings: How strong is Tulsa-area shale?","answer":"It varies a lot. Rock cores from an east Tulsa sewer project tested at 4,880 to 9,560 psi, while shale along the Arkansas River averaged only 565 to 737 psi.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#faq-3","section":"data","topic":"Depth to rock from borings"},{"question":"How deep is rock south of Oklahoma City in McClain County?","answer":"At a state facility near I-35 and SH-59, borings reached competent shale at 15.5 to 25 feet under expansive clay and very weathered shale.","url":"https://terrabrain.vercel.app/data/depth-to-rock-from-borings#faq-4","section":"data","topic":"Depth to rock from borings"},{"question":"How did downspouts help crack the foundation of a 2007 Bristow house?","answer":"Downspouts discharging at the foundation eroded two corners. The engineer called it a defect and specified piers, slab leveling and downspout extensions.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers","section":"case-studies"},{"question":"Bristow downspout erosion: What did the house show?","answer":"The engineer inspected the house in February 2026. It is a one-story timber-frame house with vinyl siding, built about 2007, on a slab-on-grade with continuous perimeter footings and stem walls.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#what-did-the-house-show","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"Bristow downspout erosion: What did the engineer find was causing it?","answer":"The engineer named two factors:","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"Bristow downspout erosion: What repair was specified?","answer":"Piers under the continuous footings at the locations on the engineer's drawing; Polyurethane slab leveling at marked areas, to \"stabilize and partially lift\"; A leak test of the sub-slab supply and drain lines.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#what-repair-was-specified","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"Bristow downspout erosion: What happened on the job?","answer":"The record shows that an updated estimate based on the engineer's recommendations was prepared in March 2026. It does not record whether the work was done.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#what-happened-on-the-job","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"Bristow downspout erosion: What does this case show about Oklahoma foundations?","answer":"Downspouts are a concentrated water source. ASCE's homeowner guide for shrink-swell soils recommends downspouts that discharge at least 3 feet from the foundation into well-drained areas.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"Is a downspout that drains at the foundation a defect?","answer":"In this report the engineer called downspouts discharging at the foundation a defect and called for extensions at every downspout so water flows away from the house.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#faq-1","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"Bristow downspout erosion: Can a house less than 20 years old need piers?","answer":"Yes. This house was built about 2007 and in 2026 had significant stem-wall cracks on the eastern part of the house; the engineer specified piers under the continuous footings.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#faq-2","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"Bristow downspout erosion: What does 'stabilize and partially lift' mean for a slab?","answer":"It was the engineer's stated goal for the polyurethane slab leveling: stop the movement and recover some, not necessarily all, of the slab's lost elevation.","url":"https://terrabrain.vercel.app/case-studies/bristow-2007-slab-downspout-erosion-piers#faq-3","section":"case-studies","topic":"Bristow downspout erosion"},{"question":"How did Oklahoma's foundation code change for homes in 2022?","answer":"Oklahoma's 2018 IRC rule, effective September 14, 2022, added rebar to all footings, set anchor bolt spacing and barred trenching into footing support soil.","url":"https://terrabrain.vercel.app/data/construction-history","section":"data"},{"question":"Oklahoma foundation code history: Why does a home's construction date matter?","answer":"The rules in force when a house was built shape what is under it: how its footings were reinforced, how the frame was bolted down, and whether later trenching near the foundation was restricted. Older homes predate these amendments.","url":"https://terrabrain.vercel.app/data/construction-history#why-does-a-home-s-construction-date-matter","section":"data","topic":"Oklahoma foundation code history"},{"question":"What are Oklahoma's 2018 IRC foundation amendments?","answer":"The Oklahoma Uniform Building Code Commission adopted the 2018 IRC by permanent rule effective September 14, 2022. Its Chapter 4 (Foundations) amendments include:","url":"https://terrabrain.vercel.app/data/construction-history#what-are-oklahoma-s-2018-irc-foundation-amendments","section":"data","topic":"Oklahoma foundation code history"},{"question":"When did Oklahoma homes move from crawl spaces to slabs?","answer":"Slab-on-grade houses were still uncommon in Tulsa in the mid-1950s.","url":"https://terrabrain.vercel.app/data/construction-history#when-did-oklahoma-homes-move-from-crawl-spaces-to-slabs","section":"data","topic":"Oklahoma foundation code history"},{"question":"Have any Oklahoma cities set stricter local rules?","answer":"After the May 20, 2013 tornado, Moore became the first U.S. city to adopt building rules aimed specifically at limiting tornado damage. New homes there must be built to resist winds up to 135 mph, compared with the 90 mph nationally accepted standard cited at the time.","url":"https://terrabrain.vercel.app/data/construction-history#have-any-oklahoma-cities-set-stricter-local-rules","section":"data","topic":"Oklahoma foundation code history"},{"question":"Oklahoma foundation code history: What rules apply to manufactured homes?","answer":"Manufactured homes follow a separate set of rules. New homes in Oklahoma must be installed to HUD's federal installation standards (24 CFR Part 3285) or the manufacturer's approved instructions by a state-licensed installer.","url":"https://terrabrain.vercel.app/data/construction-history#what-rules-apply-to-manufactured-homes","section":"data","topic":"Oklahoma foundation code history"},{"question":"What soils does the code have to deal with?","answer":"Code footings sit on Oklahoma soils that can be highly expansive. A 1978 Oklahoma Agricultural Experiment Station study described Kirkland soil, sampled in Canadian County, as very plastic and highly expansive, which restricts its use for most engineering purposes.","url":"https://terrabrain.vercel.app/data/construction-history#what-soils-does-the-code-have-to-deal-with","section":"data","topic":"Oklahoma foundation code history"},{"question":"When did Oklahoma adopt the 2018 IRC foundation amendments?","answer":"Oklahoma's permanent rule adopting the 2018 International Residential Code with state amendments took effect September 14, 2022.","url":"https://terrabrain.vercel.app/data/construction-history#faq-1","section":"data","topic":"Oklahoma foundation code history"},{"question":"Does Oklahoma require rebar in house footings?","answer":"Yes. The state amendment to IRC section R403.1 adds two No. 4 reinforcing bars to all footings and requires No. 4 ties at cold joints between footings and foundation walls.","url":"https://terrabrain.vercel.app/data/construction-history#faq-2","section":"data","topic":"Oklahoma foundation code history"},{"question":"Oklahoma foundation code history: Can a plumber or pool installer dig next to my footing?","answer":"Oklahoma's added section R403.1.9 says trenching parallel to footings may not extend into the footing's bearing plane, defined by a 45-degree line down from the outside bottom edge of the footing. It names plumbing, electrical, storm shelters and pools.","url":"https://terrabrain.vercel.app/data/construction-history#faq-3","section":"data","topic":"Oklahoma foundation code history"},{"question":"What frost depth does Oklahoma use for footings?","answer":"The state rule leaves the frost depth entry blank for each local building authority to fill in, so the required depth depends on the city or county.","url":"https://terrabrain.vercel.app/data/construction-history#faq-4","section":"data","topic":"Oklahoma foundation code history"},{"question":"What share of new Oklahoma homes are built on slabs?","answer":"In 2024, 97.9% of new single-family homes in the census division that includes Oklahoma, Texas, Arkansas and Louisiana were built on slabs, compared with 73% nationally, according to NAHB analysis of Census data.","url":"https://terrabrain.vercel.app/data/construction-history#faq-5","section":"data","topic":"Oklahoma foundation code history"},{"question":"How do cherty limestone soils affect NE Oklahoma foundations?","answer":"Weathered cherty limestone leaves very gravelly soils, dense fragipans and some karst, so foundation concerns center on water, voids and rocky digging.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone","section":"geology"},{"question":"Cherty limestone, Ozark Plateau: What is the rock?","answer":"Chert is a dense, glassy rock made of silica that occurs as nodules and beds inside limestone. USDA soil descriptions for the Ozark region describe soils formed in residuum, or weathered-in-place material, from cherty limestone or cherty dolomite.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#what-is-the-rock","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"What soils form on cherty limestone?","answer":"Clarksville soils formed in hillslope sediments over clayey residuum from cherty dolomite or cherty limestone, on steep side slopes and narrow ridgetops. Key features:","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#what-soils-form-on-cherty-limestone","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"Is there karst in cherty limestone?","answer":"Karst is ground shaped by dissolving rock, with features such as sinkholes, caves, springs and disappearing streams. In other parts of the Ozarks, soils formed in residuum from cherty limestone are described with karst topography in many areas.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#is-there-karst-in-cherty-limestone","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"Cherty limestone, Ozark Plateau: What does this mean for foundations?","answer":"Water held up by a fragipan. A very slowly permeable layer starting 14 to 27 inches down can slow drainage near footings and in crawl spaces after rain. See crawl space moisture and groundwater and perched water; Voids and sudden drops.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#what-does-this-mean-for-foundations","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"Cherty limestone, Ozark Plateau: What is chert?","answer":"Chert is a hard, glassy rock made of silica that forms nodules and layers in limestone. In northeast Oklahoma soils formed from cherty limestone, chert gravel can make up a large share of the subsoil.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#faq-1","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"Do soils on cherty limestone swell?","answer":"The main soils here, such as Clarksville and Nixa, are gravelly and loamy near the surface, with more clayey layers deeper down, such as below about 36 to 54 inches in Clarksville soils. Water, voids and hard digging are the more common issues.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#faq-2","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"Cherty limestone, Ozark Plateau: What is a fragipan?","answer":"A fragipan is a dense, brittle subsoil layer that roots and water pass through slowly. In Nixa soils it starts about 14 to 27 inches down, and permeability is very slow.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#faq-3","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"Cherty limestone, Ozark Plateau: Are there sinkholes in northeast Oklahoma?","answer":"The Oklahoma Geological Survey names the Ozark area of northeast Oklahoma as one of the state's two main limestone and dolomite karst regions, where sinkholes, caverns and subsidence are potential hazards.","url":"https://terrabrain.vercel.app/geology/mississippian-cherty-limestone#faq-4","section":"geology","topic":"Cherty limestone, Ozark Plateau"},{"question":"How do drilled bell-bottom piers work on expansive clay?","answer":"A drilled bell-bottom pier is a reinforced concrete column with a widened base set below the active clay and anchored to minimize uplift from swelling clay.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers","section":"repairs"},{"question":"Drilled bell-bottom piers: How does the system work?","answer":"Trade words used on this page: - Auger: a large drill that bores a round shaft into the ground. - Under-reaming (belling): widening the bottom of the shaft with a special tool to form the bell. - Rebar cage: a bundle of steel reinforcing bars lowered into the shaft before concrete is placed. - Pier cap: the top of the pier, on which a beam or footing rests. - Active zone: the depth of soil whose moisture, and therefore volume, changes with the seasons.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#how-does-the-system-work","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"Why do depth and the bell matter?","answer":"Engineering guidance for swelling soils calls for piers to extend well below the zone of seasonal moisture change and to be anchored in non-swelling soil against uplift, using belled bottoms, grooved pier holes or greater depth.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#why-do-depth-and-the-bell-matter","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"Where are drilled piers used?","answer":"New construction on swelling soil: drilled piers with a grade beam are generally recommended for moderately to highly swelling soils, with a 3 to 6 in gap between the soil and the beam.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#where-are-drilled-piers-used","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"What can go wrong with drilled piers?","answer":"When piers move after construction or repair, the mechanism is described in pier uplift or movement after repair.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#what-can-go-wrong-with-drilled-piers","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"Drilled bell-bottom piers: What practical considerations apply?","answer":"Design input: depth and bell size come from a site soil investigation, and swelling-soil guidance calls for the foundation to be designed by an engineer who specializes in soil and foundation engineering; depth to rock from borings summarizes Oklahoma boring data; Engineering: drilled piers are an engineered system; how homeowners work with an engineer is covered in working with engineers.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#what-practical-considerations-apply","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"What is a drilled bell-bottom pier?","answer":"It is a reinforced concrete pier cast in an augered hole, with the bottom of the hole widened into a bell shape. The pier carries load down below the clay that swells and shrinks, and the bell anchors it against being pulled up.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#faq-1","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"Why does a pier need a bell in expansive clay?","answer":"Swelling clay grips the upper part of a pier and can lift it. Engineering guidance calls for piers on swelling soil to be anchored in non-swelling soil by belled bottoms, grooved holes or greater depth.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#faq-2","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"How deep do drilled piers need to go?","answer":"Well below the zone of seasonal moisture change, which researchers report can extend from 3 to 40 feet deep. The design depth comes from a geotechnical investigation for the site.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#faq-3","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"Have drilled piers been studied in Oklahoma?","answer":"Yes. An Oklahoma Department of Transportation study published in 2024 built and load-tested eight drilled shafts socketed in weak rock at two Oklahoma sites to improve design methods.","url":"https://terrabrain.vercel.app/repairs/drilled-bell-bottom-piers#faq-4","section":"repairs","topic":"Drilled bell-bottom piers"},{"question":"How do erosion, creeks and slopes threaten Oklahoma foundations?","answer":"Runoff can undermine slab edges, creeks can cut into banks, clay on slopes can creep, and underground flow can carry soil away and leave voids.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes","section":"guides"},{"question":"Erosion, creeks and slopes: How does water take soil away?","answer":"Flood-plain soils show how active these settings are. Port soils, on narrow flood plains in central Oklahoma, flood occasionally or frequently for very brief periods during March to October.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes#how-does-water-take-soil-away","section":"guides","topic":"Erosion, creeks and slopes"},{"question":"Erosion, creeks and slopes: What are other warning signs?","answer":"Besides exposed slab edges and leaning walls or trees, sign pages on this site cover a sudden depression or sinkhole, which can mark underground soil loss, and water ponding near the foundation, which shows where runoff collects.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes#what-are-other-warning-signs","section":"guides","topic":"Erosion, creeks and slopes"},{"question":"Erosion, creeks and slopes: How are these problems repaired?","answer":"Because steep slopes, bare ground and heavy rain drive erosion, repair options focus on the water and the slope as well as the house. They are described on slope and erosion stabilization and drainage solutions.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes#how-are-these-problems-repaired","section":"guides","topic":"Erosion, creeks and slopes"},{"question":"Can erosion undermine a house foundation?","answer":"Yes. Concentrated runoff or floodwater can wash soil out from under slab edges and footings, leaving them unsupported. Steeper slopes and bare ground increase the chance of erosion.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes#faq-1","section":"guides","topic":"Erosion, creeks and slopes"},{"question":"Are houses near creeks at more risk?","answer":"Houses near streams can lose support if the bank erodes, and flood-plain soils can flood. Removing long-term plant cover along streams can lead to significant erosion from stream flow.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes#faq-2","section":"guides","topic":"Erosion, creeks and slopes"},{"question":"Erosion, creeks and slopes: What is slope creep?","answer":"Slope creep is the slow, gradual downhill movement of soil. On clay soils, dry spells open deep cracks, and water entering those cracks in intense rain makes the soil swell; on slopes, these cycles can add to the movement.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes#faq-3","section":"guides","topic":"Erosion, creeks and slopes"},{"question":"Erosion, creeks and slopes: Is heavy rain getting more common in Oklahoma?","answer":"NOAA reports that 2-inch extreme rainfall events in Oklahoma have increased since 1985 and projects more extreme precipitation, which raises flood risk and soil erosion.","url":"https://terrabrain.vercel.app/guides/erosion-creeks-and-slopes#faq-4","section":"guides","topic":"Erosion, creeks and slopes"},{"question":"How do freezes and frost affect Oklahoma foundations?","answer":"Frost is a secondary issue in most of Oklahoma; freezes mainly affect porches, steps, driveways and plumbing, more so in the northwest and Panhandle.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth","section":"guides"},{"question":"How does frost move soil?","answer":"Frost heave happens when water in the soil freezes and expands, pushing shallow concrete or footings upward; it settles back, often unevenly, when the ground thaws.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth#how-does-frost-move-soil","section":"guides","topic":"Freeze-thaw and frost depth"},{"question":"Freeze-thaw and frost depth: What is Oklahoma's winter climate like?","answer":"Winters are shorter and less severe than in the northern Plains states; The Oklahoma Climatological Survey describes frozen soil as rare and brief; Temperatures at or below 32°F occur on average about 60 days a year in the southeast.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth#what-is-oklahoma-s-winter-climate-like","section":"guides","topic":"Freeze-thaw and frost depth"},{"question":"How does frost compare with clay movement?","answer":"Frost heave is seasonal and limited to the depth that actually freezes. Clay shrink-swell responds to moisture and follows wet and dry cycles rather than cold spells, and the depth of seasonal moisture variation is typically 15 feet or more.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth#how-does-frost-compare-with-clay-movement","section":"guides","topic":"Freeze-thaw and frost depth"},{"question":"Is frost heave a big problem for Oklahoma foundations?","answer":"Usually less than in northern states. Oklahoma's winters are shorter and milder than the northern Plains, and frozen soil is described by the state climatologist as rare and brief. Shrink-swell clay is the more common cause of movement.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth#faq-1","section":"guides","topic":"Freeze-thaw and frost depth"},{"question":"Freeze-thaw and frost depth: Where does Oklahoma get the most freezing weather?","answer":"Snowfall rises from under 2 inches a year in the far southeast to nearly 30 inches in the western Panhandle, so cold-season effects are strongest in the northwest and Panhandle.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth#faq-2","section":"guides","topic":"Freeze-thaw and frost depth"},{"question":"How can a hard freeze cause foundation problems?","answer":"Mostly through water. Frozen or burst pipes can release water under a slab or into a crawl space, and wet clay can then swell or soft soil can lose support.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth#faq-3","section":"guides","topic":"Freeze-thaw and frost depth"},{"question":"Can Mesonet soil moisture data be used during a hard freeze?","answer":"Not reliably. The Mesonet notes that soil moisture can't be measured when the ground is frozen, so winter soil moisture maps may have large gaps.","url":"https://terrabrain.vercel.app/guides/freeze-thaw-and-frost-depth#faq-4","section":"guides","topic":"Freeze-thaw and frost depth"},{"question":"How do helical piers support a foundation?","answer":"A steel shaft with screw plates is turned into the ground and bracketed to the foundation. It installs without building weight, suiting light loads and uplift.","url":"https://terrabrain.vercel.app/repairs/helical-piers","section":"repairs"},{"question":"How does a helical pier work?","answer":"Trade words used on this page: - Shaft: a square steel bar or round steel pipe, added in sections as it goes deeper. - Helix (helical plate): a round steel plate formed into one turn of a screw, welded near the lead end; a pier may have one or several. - Torque: the turning force the motor applies, read from a calibrated gauge during installation. - Bracket: the steel seat that connects the pier to the footing, slab edge or beam. - Tension capacity: the ability to resist being pulled upward.","url":"https://terrabrain.vercel.app/repairs/helical-piers#how-does-a-helical-pier-work","section":"repairs","topic":"Helical piers"},{"question":"Helical piers: Why is torque recorded?","answer":"Turning resistance is used as a measure of soil strength in federal rules: HUD's manufactured home installation standard uses a torque probe, a small screw-tipped rod turned into the soil, to classify soil strength: readings over 550 inch-pounds indicate class 2 soils such as gravel and dense sand, while readings under 175 indicate class 5 soils: uncompacted fill, peat and organic clays.","url":"https://terrabrain.vercel.app/repairs/helical-piers#why-is-torque-recorded","section":"repairs","topic":"Helical piers"},{"question":"How deep must helical piers go in clay?","answer":"Expansive soils swell with added moisture and can lift a structure, and shrink with moisture loss and let it settle; Seasonal moisture change in clay can reach from 3 to 40 ft deep, and the upper part of a pier can lose contact with shrinking soil; Engineering guidance for swelling soils calls for piers to extend well below the zone of seasonal moisture change and to be anchored in non-swelling soil against uplift.","url":"https://terrabrain.vercel.app/repairs/helical-piers#how-deep-must-helical-piers-go-in-clay","section":"repairs","topic":"Helical piers"},{"question":"What are the limits of helical piers?","answer":"Plates that end inside the active zone do not provide reliable anchorage, which depends on soil below the zone of seasonal moisture change; Corner piers on swelling soil can be lifted in wet seasons, then lose skin friction as the soil shrinks in dry seasons and drop; The design depth depends on site soil data; soil survey reports are the minimum resource for locating expansive soils.","url":"https://terrabrain.vercel.app/repairs/helical-piers#what-are-the-limits-of-helical-piers","section":"repairs","topic":"Helical piers"},{"question":"How do helical piers compare to other piers?","answer":"Helical piers, steel push piers, pressed concrete piles and drilled piers are compared side by side in the method selection matrix.","url":"https://terrabrain.vercel.app/repairs/helical-piers#how-do-helical-piers-compare-to-other-piers","section":"repairs","topic":"Helical piers"},{"question":"What is a helical pier?","answer":"A helical pier is a steel shaft with one or more screw-shaped plates welded near the tip. A hydraulic motor turns it into the ground like a screw, and a bracket connects the top to the foundation.","url":"https://terrabrain.vercel.app/repairs/helical-piers#faq-1","section":"repairs","topic":"Helical piers"},{"question":"Why is installation torque recorded on helical piers?","answer":"The resistance to turning rises in firmer soil, so the torque reading at the end of installation is used as an indicator of the soil the plates are bearing in. Federal manufactured housing rules use torque-probe readings in the same way to classify soil strength.","url":"https://terrabrain.vercel.app/repairs/helical-piers#faq-2","section":"repairs","topic":"Helical piers"},{"question":"When are helical piers used instead of push piers?","answer":"Helical piers do not rely on the weight of the building to drive them, so they are used for light structures such as porches, additions and manufactured homes, and where resistance to upward pull is needed.","url":"https://terrabrain.vercel.app/repairs/helical-piers#faq-3","section":"repairs","topic":"Helical piers"},{"question":"Can helical piers resist heave from swelling clay?","answer":"Engineering guidance for swelling soils calls for piers to be anchored in non-swelling soil below the zone of seasonal moisture change to resist uplift. A helical plate set below that zone provides that anchorage, while plates within it move with the clay.","url":"https://terrabrain.vercel.app/repairs/helical-piers#faq-4","section":"repairs","topic":"Helical piers"},{"question":"How do mudjacking and polyurethane foam lift a sunken slab?","answer":"Both pump material under a slab, cement slurry or expanding foam, to fill gaps and lift it, but they rest on the same soil and do not stop clay movement.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane","section":"repairs"},{"question":"Mudjacking and foam lifting: What are the two methods?","answer":"Mudjacking pressure-injects a slurry of sand, fly ash or topsoil mixed with cement between the slab and the soil. The slurry fills empty spaces and, as more is pumped in, raises the slab.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#what-are-the-two-methods","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"Mudjacking and foam lifting: Where are these methods used?","answer":"Driveways, sidewalks, patios, garage slabs and pool decks — see heaved or settled flatwork and flatwork and exterior slabs; Filling voids under slabs after erosion or leak washout — see erosion, undermining and washout voids; Interior slab areas that have settled over loose fill, rather than heaved.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#where-are-these-methods-used","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"Mudjacking and foam lifting: Why don't they fix clay movement?","answer":"Expansive clay swells when wet and shrinks when dry, and its shrinkage cracks do not close up perfectly on rewetting. A slab lifted with grout or foam still sits on that soil.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#why-don-t-they-fix-clay-movement","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"What are the risks during lifting?","answer":"The same review lists installation problems for both methods:","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#what-are-the-risks-during-lifting","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"What should be checked before lifting?","answer":"Plumbing. Grout and foam can enter cracked or broken pipes and plug them, so under-slab drains are often checked before lifting. A hydrostatic test plugs the main drain, fills the under-slab system to slab level and watches for a drop in water level for up to 15 minutes.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#what-should-be-checked-before-lifting","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"Mudjacking and foam lifting: Can they be combined with other repairs?","answer":"Foam or grout is sometimes used together with piers: piers carry the foundation beam, and foam fills voids or supports the slab between beams. Cost depends mainly on slab area, how much material is needed and access.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#can-they-be-combined-with-other-repairs","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"What is the difference between mudjacking and polyurethane foam lifting?","answer":"Mudjacking pumps a slurry of cement mixed with sand, fly ash or soil under the slab. Polyurethane lifting injects a two-part foam that expands under the slab; the slab then rests on the cured foam.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#faq-1","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"Will mudjacking or foam stop my foundation from moving again?","answer":"No. Both are shallow repairs that sit on the same soil, and engineering reviews list changing soil moisture, plumbing leaks, trees and poor drainage as causes of movement after these repairs.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#faq-2","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"Why test the plumbing before slab lifting?","answer":"Grout or foam can flow into cracked or broken drain lines and plug them, and leaks change soil moisture under the slab. A hydrostatic drain test is one way to check under-slab drain lines.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#faq-3","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"Can slab lifting crack the concrete?","answer":"Yes. Injecting too much material or using too much pressure can make the slab bulge, crack or blow out, so lifting is done gradually.","url":"https://terrabrain.vercel.app/repairs/slabjacking-and-polyurethane#faq-4","section":"repairs","topic":"Mudjacking and foam lifting"},{"question":"How do Oklahoma drought and wet cycles move foundations?","answer":"Oklahoma clay shrinks in drought and swells when wet, so foundations drop at the edges during drought and can be pushed back up when heavy rain returns.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles","section":"guides"},{"question":"Drought and wet cycles: Why does the weather cycle matter to a foundation?","answer":"Many Oklahoma homes sit on expansive clay, a soil made of very fine clay minerals that swell when water enters and shrink when the soil dries out.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#why-does-the-weather-cycle-matter-to-a-foundation","section":"guides","topic":"Drought and wet cycles"},{"question":"What are Oklahoma's recent droughts and wet spells?","answer":"The National Weather Service in Tulsa links the 2011 drought to La Niña, a cooling of the equatorial Pacific that shifts the jet stream north and raises the odds of warm, dry weather in the Southern Plains.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#what-are-oklahoma-s-recent-droughts-and-wet-spells","section":"guides","topic":"Drought and wet cycles"},{"question":"Drought and wet cycles: How can you track where the cycle is?","answer":"U.S.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#how-can-you-track-where-the-cycle-is","section":"guides","topic":"Drought and wet cycles"},{"question":"Why do foundation cracks show up during an Oklahoma drought?","answer":"Expansive clay soils shrink as they dry. When the soil around the edge of a house dries faster than the soil under the middle, the perimeter can drop and cracks open in brick, drywall and slabs.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#faq-1","section":"guides","topic":"Drought and wet cycles"},{"question":"Can heavy rain after a drought cause foundation problems too?","answer":"Yes. Dry clay swells when it takes on water again, so a sudden wet period after a drought can push parts of a foundation upward. Studies of the 2011 drought found it increased the potential heave of clay soils.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#faq-2","section":"guides","topic":"Drought and wet cycles"},{"question":"How bad was the 2011 drought in Oklahoma?","answer":"Summer 2011 was Oklahoma's hottest on record at an average of 86.9°F, and the state's 2011 rainfall was about 11 inches below normal. By early January 2012 nearly 79% of the state was still in moderate drought or worse.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#faq-3","section":"guides","topic":"Drought and wet cycles"},{"question":"Drought and wet cycles: What was Oklahoma's wettest year on record?","answer":"2015. The statewide average was 53.88 inches, beating the 1957 record, and May 2015 was the wettest month in state history at 14.40 inches.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#faq-4","section":"guides","topic":"Drought and wet cycles"},{"question":"Where can I check current drought conditions in Oklahoma?","answer":"The U.S. Drought Monitor publishes an updated map every Thursday, and the Oklahoma Mesonet posts daily soil moisture readings from stations statewide.","url":"https://terrabrain.vercel.app/guides/drought-and-wet-cycles#faq-5","section":"guides","topic":"Drought and wet cycles"},{"question":"How do Oklahoma river floodplain and terrace soils affect homes?","answer":"Floodplain and terrace deposits range from soft wet clay to sandy dunes and expansive claypans, so the soil series, not the river, predicts behavior.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces","section":"geology"},{"question":"How do floodplains and terraces differ?","answer":"Alluvium is sediment deposited by flowing water. The present floodplain is the low, flat land a river still floods. A terrace (or paleoterrace) is an older floodplain surface left higher than today's river as it cut downward.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#how-do-floodplains-and-terraces-differ","section":"geology","topic":"Floodplain and terrace soils"},{"question":"What soils form on floodplains?","answer":"Osage is a Vertisol, a clay soil defined by shrink-swell, with intersecting slickensides from about 13 to 60 inches deep.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#what-soils-form-on-floodplains","section":"geology","topic":"Floodplain and terrace soils"},{"question":"What soils form on terraces?","answer":"An Oklahoma State University study of five western Oklahoma soils found Kirkland had the greatest total shrink-swell across its profile, with a coefficient of linear extensibility up to about 0.090, and found Norge, on uplands of old alluvial origin, reached about 0.066.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#what-soils-form-on-terraces","section":"geology","topic":"Floodplain and terrace soils"},{"question":"Floodplain and terrace soils: What does this mean for foundations?","answer":"A thick clay floodplain soil with a water table within 6 to 18 inches for half the year can compress under load and stay wet beneath crawl spaces. See soft soil consolidation and crawl space moisture.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#what-does-this-mean-for-foundations","section":"geology","topic":"Floodplain and terrace soils"},{"question":"What is the difference between alluvium and a terrace?","answer":"Alluvium is sediment laid down by a river, usually on the present floodplain. A terrace is an older, higher floodplain left behind as the river cut down, so terrace soils are older, better developed and usually above normal flood levels.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#faq-1","section":"geology","topic":"Floodplain and terrace soils"},{"question":"Are floodplain soils bad for foundations?","answer":"It depends on the soil. Some, like Osage, are thick, poorly drained smectite clay with a water table within 6 to 18 inches in winter and spring. Others, like Port and Verdigris, are well-drained silty or loamy soils that still flood at times.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#faq-2","section":"geology","topic":"Floodplain and terrace soils"},{"question":"Can terrace soils be expansive?","answer":"Yes. Kirkland and Tabler formed on old terraces and have clay subsoils with slickensides, a sign of repeated shrink and swell. Others, like Dougherty, are sandy.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#faq-3","section":"geology","topic":"Floodplain and terrace soils"},{"question":"Floodplain and terrace soils: How thick is alluvium along Oklahoma rivers?","answer":"It varies. In Oklahoma County, the North Canadian River alluvium generally averages about 50 feet thick and may be up to 150 feet thick in the river channel itself.","url":"https://terrabrain.vercel.app/geology/quaternary-alluvium-and-terraces#faq-4","section":"geology","topic":"Floodplain and terrace soils"},{"question":"How do Oklahoma storms, floods and ice affect foundations?","answer":"Water is the main way severe weather reaches a foundation: floods and heavy rain saturate clay and wash out soil, while wind and tornadoes act on the structure.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects","section":"guides"},{"question":"How severe is Oklahoma's weather by the numbers?","answer":"From 1985 to 2019 Oklahoma averaged 60 tornadoes a year, with peaks in April and May; About three-fourths of the state's tornadoes have occurred in April, May and June; autumn is a secondary severe weather season; Flooding is most frequent in the spring and autumn months that bring the most rain.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects#how-severe-is-oklahoma-s-weather-by-the-numbers","section":"guides","topic":"Severe weather effects"},{"question":"How does each weather event affect foundations?","answer":"After flooding or leaks, the EPA advises drying water-damaged areas and items within 24–48 hours to prevent mold.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects#how-does-each-weather-event-affect-foundations","section":"guides","topic":"Severe weather effects"},{"question":"How does weather relate to insurance questions?","answer":"Storm-related claims often raise the question of whether damage came from the storm or from long-term soil movement.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects#how-does-weather-relate-to-insurance-questions","section":"guides","topic":"Severe weather effects"},{"question":"Severe weather effects: Can flooding damage a house foundation?","answer":"Yes. Floodwater saturates soil, which can make clay swell, soften soil under footings, push on basement walls and wash soil out from under slab edges.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects#faq-1","section":"guides","topic":"Severe weather effects"},{"question":"Severe weather effects: Are heavy rains in Oklahoma getting more common?","answer":"NOAA reports that the number of 2-inch extreme rainfall events in Oklahoma has increased since 1985, and projects further increases in extreme precipitation, with higher flood risk and more soil erosion.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects#faq-2","section":"guides","topic":"Severe weather effects"},{"question":"When is Oklahoma's severe weather season?","answer":"Spring is the main season, with about three-fourths of Oklahoma's tornadoes occurring in April, May and June. Autumn is a secondary severe weather season.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects#faq-3","section":"guides","topic":"Severe weather effects"},{"question":"Severe weather effects: Why do foundation problems show up after a big rain following drought?","answer":"Clay that dried and shrank during drought swells quickly when it gets wet again, so parts of a foundation can rise or cracks can shift soon after the drought breaks.","url":"https://terrabrain.vercel.app/guides/severe-weather-effects#faq-4","section":"guides","topic":"Severe weather effects"},{"question":"How do Oklahoma's geologic regions affect foundations?","answer":"Pennsylvanian shales and sandstones in the east and Permian red beds in central and western Oklahoma shape soil, clay content and depth to firm material.","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces","section":"guides"},{"question":"What are Oklahoma's geologic provinces?","answer":"The Oklahoma Geological Survey's 2024 structural and tectonic map names the state's major provinces:","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces#what-are-oklahoma-s-geologic-provinces","section":"guides","topic":"Oklahoma geologic provinces"},{"question":"Oklahoma geologic provinces: What did eastern and western soils form from?","answer":"USDA soil descriptions record the rock each soil weathered from, which shows the east-west split clearly:","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces#what-did-eastern-and-western-soils-form-from","section":"guides","topic":"Oklahoma geologic provinces"},{"question":"Why do geologic regions matter for foundations?","answer":"USGS karst mapping outlines rock units containing significant carbonate or evaporite minerals (gypsum is an evaporite) as soluble rocks that have developed or could develop karst features, such as sinkholes. See gypsum karst and sinkholes.","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces#why-do-geologic-regions-matter-for-foundations","section":"guides","topic":"Oklahoma geologic provinces"},{"question":"What rock is under Tulsa versus Oklahoma City?","answer":"Soils around Tulsa commonly formed from Pennsylvanian-age shale and sandstone, while soils around Oklahoma City commonly formed from Permian-age red shale, claystone and sandstone.","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces#faq-1","section":"guides","topic":"Oklahoma geologic provinces"},{"question":"What are Oklahoma's main geologic provinces?","answer":"The Oklahoma Geological Survey's structural map names the Ozark Uplift, Cherokee Platform, Arkoma Basin, Ouachita Uplift, Arbuckle Uplift, Wichita Uplift, Anadarko Basin, Ardmore and Marietta basins, Hollis-Hardeman Basin and Nemaha Uplift, among others.","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces#faq-2","section":"guides","topic":"Oklahoma geologic provinces"},{"question":"Where in Oklahoma is gypsum near the surface?","answer":"Gypsum of the Permian Blaine Formation forms shallow bedrock in parts of western and southwestern Oklahoma. Some soils there sit only inches above massive gypsum.","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces#faq-3","section":"guides","topic":"Oklahoma geologic provinces"},{"question":"Does rainfall differ across Oklahoma's regions?","answer":"Yes. Average annual precipitation ranges from about 17 inches in the far western Panhandle to about 56 inches in the far southeast.","url":"https://terrabrain.vercel.app/guides/oklahoma-geologic-provinces#faq-4","section":"guides","topic":"Oklahoma geologic provinces"},{"question":"How do Ouachita Mountain rocks affect southeast Oklahoma homes?","answer":"Tightly folded sandstone, shale and chert form steep slopes with thin, rocky soils, so slope movement, erosion and fill matter more than clay swell.","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks","section":"geology"},{"question":"How did the Ouachita Mountains form?","answer":"The Ouachita rocks were deeply buried, and the heat and pressure of mountain building squeezed and tightly folded them about 315 million years ago. The wooded mountains now rise roughly 500 to 1,500 feet above nearby valleys.","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#how-did-the-ouachita-mountains-form","section":"geology","topic":"Ouachita Mountains geology"},{"question":"Ouachita Mountains geology: What are the main rock types?","answer":"The same survey described three kinds of layers that still frame how the region is understood:","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#what-are-the-main-rock-types","section":"geology","topic":"Ouachita Mountains geology"},{"question":"Ouachita Mountains geology: What soils form on the folded rocks?","answer":"Ridges and mountainsides commonly carry thin soils over sandstone. The Hector series is an example:","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#what-soils-form-on-the-folded-rocks","section":"geology","topic":"Ouachita Mountains geology"},{"question":"Ouachita Mountains geology: What does this mean for foundations?","answer":"Hector soils occur on slopes up to 60 percent. On slopes like these, soil and fill on the downhill side of a house can creep slowly downslope over years; signs include leaning retaining walls, fences and trees.","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#what-does-this-mean-for-foundations","section":"geology","topic":"Ouachita Mountains geology"},{"question":"What kind of rock makes up the Ouachita Mountains?","answer":"Mostly sandstone, shale and chert that were deeply buried and then squeezed into tight folds and faults about 315 million years ago. Hard sandstone forms the ridges and softer shale forms the valleys.","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#faq-1","section":"geology","topic":"Ouachita Mountains geology"},{"question":"Are soils deep in the Ouachitas?","answer":"On ridges and mountainsides they are often thin. Hector soils, for example, reach hard sandstone at about 14 to 20 inches and occur on slopes up to 60 percent.","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#faq-2","section":"geology","topic":"Ouachita Mountains geology"},{"question":"Ouachita Mountains geology: What foundation problems are common on steep, rocky lots?","answer":"Common concerns are downhill soil creep, erosion of thin soil around footings, and fill placed to level a lot.","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#faq-3","section":"geology","topic":"Ouachita Mountains geology"},{"question":"Ouachita Mountains geology: Why does rock type change so quickly across a lot?","answer":"Because the layers are steeply tilted and faulted, hard sandstone and soft shale can both reach the surface within short distances.","url":"https://terrabrain.vercel.app/geology/ouachita-folded-rocks#faq-4","section":"geology","topic":"Ouachita Mountains geology"},{"question":"How do Panhandle Ogallala and loess soils affect foundations?","answer":"Panhandle soils formed in Ogallala deposits capped by loess and sand. They are dry most of the year, so movement follows sudden moisture changes.","url":"https://terrabrain.vercel.app/geology/ogallala-formation-and-loess","section":"geology"},{"question":"What layers lie under the Panhandle?","answer":"USDA soil descriptions identify the Ogallala Formation as calcareous, loamy alluvium (river-laid sediment) of Miocene-Pliocene age.","url":"https://terrabrain.vercel.app/geology/ogallala-formation-and-loess#what-layers-lie-under-the-panhandle","section":"geology","topic":"Panhandle Ogallala and loess"},{"question":"Panhandle Ogallala and loess: What do these soils mean for foundations?","answer":"Every series above has a mean annual precipitation of roughly 13 to 24 inches. Ulysses notes that most rain falls in high-intensity thunderstorms from late spring through early autumn.","url":"https://terrabrain.vercel.app/geology/ogallala-formation-and-loess#what-do-these-soils-mean-for-foundations","section":"geology","topic":"Panhandle Ogallala and loess"},{"question":"What is loess?","answer":"Loess is silt that was carried and dropped by wind. In the Oklahoma Panhandle, soils such as Richfield formed in loess on high tablelands.","url":"https://terrabrain.vercel.app/geology/ogallala-formation-and-loess#faq-1","section":"geology","topic":"Panhandle Ogallala and loess"},{"question":"What is the Ogallala Formation?","answer":"It is a Miocene-Pliocene deposit laid down by rivers. USDA describes soils such as Potter as formed in calcareous, loamy alluvium from the Ogallala Formation in the Southern High Plains, including northwestern Oklahoma.","url":"https://terrabrain.vercel.app/geology/ogallala-formation-and-loess#faq-2","section":"geology","topic":"Panhandle Ogallala and loess"},{"question":"Do Panhandle soils swell like central Oklahoma clay?","answer":"Some do. Richfield has a smectitic clay subsoil, while Dalhart is loamy. Low rainfall means the soils are often dry, so a sudden wetting from a leak or poor drainage can be a bigger change than in wetter parts of the state.","url":"https://terrabrain.vercel.app/geology/ogallala-formation-and-loess#faq-3","section":"geology","topic":"Panhandle Ogallala and loess"},{"question":"Panhandle Ogallala and loess: What is caliche?","answer":"Caliche is a layer of soil cemented or enriched with calcium carbonate. Panhandle soils commonly have carbonate accumulations that start within a few inches to a couple of feet of the surface.","url":"https://terrabrain.vercel.app/geology/ogallala-formation-and-loess#faq-4","section":"geology","topic":"Panhandle Ogallala and loess"},{"question":"How do Pennsylvanian shale clays affect Oklahoma foundations?","answer":"Pennsylvanian shale under Tulsa and eastern Oklahoma weathers into poorly drained clays that hold perched water and often swell and shrink strongly.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales","section":"geology"},{"question":"What is Pennsylvanian shale?","answer":"Shale is rock made of compacted clay and silt that splits into thin layers. In northeastern Oklahoma, the Nowata is an example: a series of bluish or greenish shales with a few sandstones and at least one coal bed, varying from about 50 to 600 feet thick at Tulsa.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales#what-is-pennsylvanian-shale","section":"geology","topic":"Pennsylvanian shale clays"},{"question":"What clay soils form on shale?","answer":"Soil scientists rate shrink-swell using the coefficient of linear extensibility (COLE), the fraction a soil's length changes from moist to dry. A COLE of 0.06 to 0.09 is high and 0.09 or more is very high.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales#what-clay-soils-form-on-shale","section":"geology","topic":"Pennsylvanian shale clays"},{"question":"Pennsylvanian shale clays: What does this mean for foundations?","answer":"Wet-season edge lift. Perched water from late fall to spring wets the clay at slab edges and under crawl spaces. See perimeter wetting heave and groundwater and perched water; Summer edge drop. As perched water disappears and clay dries, deep cracks open in soils like Summit.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales#what-does-this-mean-for-foundations","section":"geology","topic":"Pennsylvanian shale clays"},{"question":"What is shale and why does it matter for foundations?","answer":"Shale is a layered rock made of compacted clay and silt. When it weathers near the surface it turns back into clay soil, and in eastern Oklahoma many of those clay soils swell when wet and shrink when dry.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales#faq-1","section":"geology","topic":"Pennsylvanian shale clays"},{"question":"Why is the ground so wet in winter and spring on shale soils?","answer":"Unweathered shale lets very little water through, so rain collects above it as a perched water table. Dennis, Okemah, Parsons and Summit soils all hold perched water in roughly November through May.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales#faq-2","section":"geology","topic":"Pennsylvanian shale clays"},{"question":"Which shale soils swell the most?","answer":"Summit is a smectitic clay, the swelling clay family. It forms deep, wide summer cracks and has a coefficient of linear extensibility of 0.09 or more, which is in the very high class.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales#faq-3","section":"geology","topic":"Pennsylvanian shale clays"},{"question":"How thick are these shale formations?","answer":"Very thick. The Nowata shale varies from about 50 to 600 feet thick at Tulsa, and the Boggy Formation near McAlester is 610 to 1,220 meters.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-shales#faq-4","section":"geology","topic":"Pennsylvanian shale clays"},{"question":"How do pressed concrete piles work and what are their limits?","answer":"Short precast concrete cylinders are jacked into the ground until they stop. Refusal does not prove stable soil, and they generally do not resist uplift.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles","section":"repairs"},{"question":"Pressed concrete piles: How does the system work?","answer":"A pile (or pier) is a column that carries a building's load down to firmer soil. Underpinning means adding piles under an existing foundation. With pressed concrete piles:","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#how-does-the-system-work","section":"repairs","topic":"Pressed concrete piles"},{"question":"Pressed concrete piles: What are the installation steps?","answer":"Dig an access hole at the foundation beam; Press the first segment and keep adding segments under the jack; Continue to refusal and record the depth and driving force or pressure.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#what-are-the-installation-steps","section":"repairs","topic":"Pressed concrete piles"},{"question":"Pressed concrete piles: What spacing does published guidance show?","answer":"For lightly loaded homes, one engineering guideline gives prescriptive maximum spacing:","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#what-spacing-does-published-guidance-show","section":"repairs","topic":"Pressed concrete piles"},{"question":"Pressed concrete piles: What are the limitations?","answer":"Refusal only shows the jack could not push further at that moment. Guidelines note that piles that do not reach stable soil below the active zone — the depth where soil moisture changes with the seasons — may not resist shrink or swell movement.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#what-are-the-limitations","section":"repairs","topic":"Pressed concrete piles"},{"question":"Pressed concrete piles: How do they compare with steel push piers?","answer":"Steel push piers are installed the same way but use steel pipe, which can often be driven deeper. Oklahoma installation records for steel push piers at one large Tulsa site logged a median depth of about 12 feet, with the middle half between 9 and 14 feet.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#how-do-they-compare-with-steel-push-piers","section":"repairs","topic":"Pressed concrete piles"},{"question":"What is a pressed concrete pile?","answer":"It is a column of short precast concrete cylinders pushed into the ground one at a time with a hydraulic jack that uses the weight of the house as its reaction. Pressing stops at refusal, when the driving force exceeds the load the pile must carry.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#faq-1","section":"repairs","topic":"Pressed concrete piles"},{"question":"Does refusal prove a pressed pile has enough capacity?","answer":"Not by itself. Engineering guidance notes that piles that stop before reaching stable soil below the active zone may not resist shrink and swell movement, and shallow piles can lose skin friction during drought.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#faq-2","section":"repairs","topic":"Pressed concrete piles"},{"question":"Do pressed concrete piles stop a slab from heaving?","answer":"No. Guidelines state these piles generally do not resist uplift, so they will not stop swelling clay from lifting a foundation that rests on it.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#faq-3","section":"repairs","topic":"Pressed concrete piles"},{"question":"Should pressed piles have a cable or rebar through the center?","answer":"Reinforcement through the center hole is optional in published guidelines. A committee review lists unreinforced segments shifting sideways as one possible cause of problems after repair.","url":"https://terrabrain.vercel.app/repairs/pressed-concrete-piles#faq-4","section":"repairs","topic":"Pressed concrete piles"},{"question":"How do slab-on-grade foundations move on Oklahoma clay?","answer":"The slab moves as clay under its edges or center gains or loses moisture, and the shape of that movement decides which repair, if any, fits.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade","section":"foundations"},{"question":"How is a slab-on-grade foundation built?","answer":"Slab: the code minimum thickness for a concrete floor on the ground is 3.5 in; Base and vapor retarder: a 4-in base of gravel or crushed stone and a 6-mil polyethylene vapor retarder under the concrete; Perimeter beam: the edge turns down into a thickened footing, also called a grade beam or turn-down.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#how-is-a-slab-on-grade-foundation-built","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"Why do slabs move on clay?","answer":"Foundations on expansive soil fall under the building code's expansive-soil design section, and a soil counts as expansive if, for example, its plasticity index is 15 or more. Swelling soils lift and crack lightly loaded footings and often distress floor slabs.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#why-do-slabs-move-on-clay","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"Slab-on-grade foundations: What are the common movement patterns?","answer":"Engineering guidance for swelling soils notes that some cracking of floating slabs should be expected. Whether a crack matters structurally is decided by floor elevations over time, which is covered in elevation surveys and heave vs settlement.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#what-are-the-common-movement-patterns","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"Slab-on-grade foundations: Which repairs fit each pattern?","answer":"Edge drop or perimeter settlement: perimeter underpinning such as steel push piers, pressed concrete piles, helical piers or drilled piers; Interior settlement: interior piers by tunneling or coring, or slab lifting by injection; Moisture-driven movement: drainage, root barriers and moisture control, and plumbing leak detection.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#which-repairs-fit-each-pattern","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"How thick is a typical house slab?","answer":"The residential code minimum for a concrete floor slab on the ground is 3.5 inches, placed over a base course with a 6-mil polyethylene vapor retarder. The outside edge is thickened into a footing that turns down into the soil.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#faq-1","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"Are hairline cracks in my slab a foundation problem?","answer":"Not by themselves. Concrete shrinks as it dries, and extra water in the mix increases that shrinkage. Floor elevations, not the crack alone, show whether the slab has moved.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#faq-2","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"Why is the middle of my slab higher than the edges?","answer":"Clay under the center of a slab can gain moisture over time, from a long-term build-up or a plumbing leak, while the edges dry. Research models of slabs on expansive soil show this center-lift pattern as well as edge lift and edge drop.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#faq-3","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"What changed for slabs in Oklahoma's 2024 code adoption?","answer":"Oklahoma's adoption requires fill under slabs to be compacted in 8 to 12 inch lifts, raises the allowed depth of clean sand or gravel fill from 24 to 48 inches while keeping earth fill at 8 inches, and requires two No. 4 bars in all footings.","url":"https://terrabrain.vercel.app/foundations/slab-on-grade#faq-4","section":"foundations","topic":"Slab-on-grade foundations"},{"question":"How do steel push piers fix a settling foundation in Oklahoma?","answer":"Steel pipe is driven down with a hydraulic ram, using the house's weight, until it reaches soil or rock that resists the load. Pressure is recorded per pier.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers","section":"repairs"},{"question":"Steel push piers: How does the system work?","answer":"A pier is a column that carries a building's load down to firmer ground. A push pier (also called a resistance pier) is driven rather than drilled:","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#how-does-the-system-work","section":"repairs","topic":"Steel push piers"},{"question":"How deep do push piers go in Oklahoma?","answer":"Oklahoma installation records for 396 steel push piers at a large Tulsa site (2025) show:","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#how-deep-do-push-piers-go-in-oklahoma","section":"repairs","topic":"Steel push piers"},{"question":"What do push piers address?","answer":"Push piers are used where the foundation has settled — moved down — and firmer soil lies below the zone causing the movement. Typical cases include perimeter drying settlement, tree-root desiccation settlement, fill consolidation settlement and soft alluvial soils.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#what-do-push-piers-address","section":"repairs","topic":"Steel push piers"},{"question":"Steel push piers: What are the limitations?","answer":"The recorded pressure shows how hard the pier resisted at the time it was driven. Engineering reviews of post-repair performance list two related problems with steel pipe piles: piles not driven deep enough, and loss of skin friction (side grip) at shallow depths during drought.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#what-are-the-limitations","section":"repairs","topic":"Steel push piers"},{"question":"Steel push piers: What records and follow-up are kept?","answer":"Each pier's depth and final pressure are recorded, and gauge pressure is converted to load using the ram area and calibrated gauges.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#what-records-and-follow-up-are-kept","section":"repairs","topic":"Steel push piers"},{"question":"How deep do steel push piers go in Tulsa?","answer":"Oklahoma installation records from one large Tulsa site logged a median depth of about 12 feet, with the middle half of piers stopping between 9 and 14 feet and a full range of 2 to 40 feet.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#faq-1","section":"repairs","topic":"Steel push piers"},{"question":"Steel push piers: Does the installation pressure prove each pier's capacity?","answer":"The recorded drive force shows the resistance at the time of installation, which is a field check on every pier. It is not a static load test, and engineering reviews note that skin friction at shallow depths can be lost in drought.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#faq-2","section":"repairs","topic":"Steel push piers"},{"question":"Can steel push piers stop a foundation from heaving?","answer":"No. Push piers resist downward load, and piers will not prevent uplift from swelling soil unless they are designed to do so. Heave is addressed by controlling the water source first.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#faq-3","section":"repairs","topic":"Steel push piers"},{"question":"Can push piers be used on a light structure?","answer":"Push piers need enough building weight to push against while they are driven. Light structures may not provide enough reaction, which is one reason helical piers are used in some cases.","url":"https://terrabrain.vercel.app/repairs/steel-push-piers#faq-4","section":"repairs","topic":"Steel push piers"},{"question":"How do Tulsa-area sandstone ridges affect Oklahoma foundations?","answer":"The sandstone forms shallow, loamy, well-drained soils, so slopes, fill, erosion and uneven rock matter more than clay swell on these lots.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones","section":"geology"},{"question":"What is Pennsylvanian sandstone?","answer":"In northeastern Oklahoma, sandstone beds alternate with shale. In Tulsa County, for example, the Coffeyville Formation was described as five zones, two of sandstone and three of shale, as much as 440 feet thick in all.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#what-is-pennsylvanian-sandstone","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"What soils form on sandstone?","answer":"A lithic contact is hard bedrock; a paralithic contact is soft, weathered rock.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#what-soils-form-on-sandstone","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"Tulsa-area sandstone soils: How does rock in the soil survey compare to pier depth?","answer":"A soil series description covers the soil and the top of the rock, not what lies deeper. Coweta's description shows why that can mislead: soft sandstone at about 15 inches can be followed by hard sandstone farther down, and both are interbedded with shale.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#how-does-rock-in-the-soil-survey-compare-to-pier-depth","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"Tulsa-area sandstone soils: What does this mean for foundations?","answer":"Slopes up to 30 to 60 percent on Collinsville, Coweta and Hector soils mean many lots are cut and filled to make a level pad. Fill that was not compacted can settle over time. See fill consolidation settlement and fill soils and lot history.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#what-does-this-mean-for-foundations","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"Which soils form on Pennsylvanian sandstone?","answer":"Common ones in eastern Oklahoma include Collinsville, Coweta and Bates. They are loamy, well drained and often shallow to sandstone.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#faq-1","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"Tulsa-area sandstone soils: How shallow is the rock?","answer":"Collinsville reaches hard rock at 4 to 20 inches, Coweta reaches soft sandstone at 10 to 20 inches, and Bates reaches soft sandstone or shale at 20 to 40 inches.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#faq-2","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"Tulsa-area sandstone soils: If rock is that shallow, why do piers sometimes go much deeper?","answer":"Sandstone often occurs as ledges with shale between them. Field records from Tulsa show steel piers stopping at a median of about 12 feet even where soil surveys show rock within a few feet, because a soil description covers only the soil and the top of the rock; soft sandstone can be followed by harder sandstone deeper down, interbedded with shale.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#faq-3","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"Do sandstone soils swell?","answer":"They are loamy rather than clayey, so seasonal swell is generally lower than on shale clays. Erosion, slope movement and fill are more common concerns.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-sandstones#faq-4","section":"geology","topic":"Tulsa-area sandstone soils"},{"question":"How do western Oklahoma red beds affect foundation soils?","answer":"Soft red sandstone and siltstone form shallow silty soils, while claystone and old river clays form expansive clay soils.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds","section":"geology"},{"question":"What are red beds?","answer":"Red beds are sedimentary rocks colored red by iron oxide. Oklahoma's Permian red beds, about 265 million years old, include red shale and sandstone along with salt and gypsum. The state rock, the rose rock, comes from these Permian red beds.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds#what-are-red-beds","section":"geology","topic":"Western Oklahoma red beds"},{"question":"What soils form from the red beds?","answer":"Both are well drained and of large extent in western Oklahoma, a few southern Kansas counties and northwestern Texas.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds#what-soils-form-from-the-red-beds","section":"geology","topic":"Western Oklahoma red beds"},{"question":"Western Oklahoma red beds: What does this mean for foundations?","answer":"On Hollister, Tillman and Vernon soils, the clay can shrink deeply in dry weather and swell when rain returns. Cracks reaching 30 to 48 inches or more show how deep seasonal drying can go. See perimeter drying settlement, center heave and the active zone.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds#what-does-this-mean-for-foundations","section":"geology","topic":"Western Oklahoma red beds"},{"question":"What are red beds?","answer":"Red beds are sedimentary rocks such as sandstone, siltstone, shale and claystone colored red by iron oxide. In western Oklahoma they date to the Permian Period, about 265 million years ago, and are interlayered with salt and gypsum.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds#faq-1","section":"geology","topic":"Western Oklahoma red beds"},{"question":"Why are some western Oklahoma soils so expansive?","answer":"Clays weathered from red-bed claystone, or washed off it into old terraces, can be highly expansive. Hollister, a smectitic clay, for example, has cracks more than 30 inches deep that stay open 150 or more days in most years.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds#faq-2","section":"geology","topic":"Western Oklahoma red beds"},{"question":"Western Oklahoma red beds: Are all red-bed soils clayey?","answer":"No. Woodward and Quinlan formed from soft red sandstone or siltstone and are loamy or silty, with soft rock at 10 to 40 inches. They are less clayey and occur on slopes of up to 40 to 50 percent.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds#faq-3","section":"geology","topic":"Western Oklahoma red beds"},{"question":"Western Oklahoma red beds: Does gypsum show up in red-bed soils?","answer":"It can. The Vernon soil may contain up to 2 percent gypsum, and shale in the red beds near Union City contains gypsum nodules and veins.","url":"https://terrabrain.vercel.app/geology/western-permian-red-beds#faq-4","section":"geology","topic":"Western Oklahoma red beds"},{"question":"How do Wichita granite and outwash affect Lawton-area foundations?","answer":"Around the Wichita Mountains, soils formed in granite outwash over red clay, such as Foard, are sodium-rich, very slowly permeable and prone to shrink-swell.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash","section":"geology"},{"question":"What is the Wichita granite?","answer":"The Wichita Mountains are built of granite and similar igneous rocks that formed about 525 million years ago. They were uplifted into mountains about 315 million years ago, during the same mountain-building episode that raised the Arbuckle and Ouachita ranges.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#what-is-the-wichita-granite","section":"geology","topic":"Wichita granite and outwash"},{"question":"What is granite wash?","answer":"As the mountains eroded, streams carried granitic sand and gravel outward onto the surrounding lowlands. This is called granitic outwash or granite wash.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#what-is-granite-wash","section":"geology","topic":"Wichita granite and outwash"},{"question":"Wichita granite and outwash: What soils are found in the Lawton area?","answer":"A natric horizon is a subsoil layer high in exchangeable sodium. In Foard, exchangeable sodium reaches roughly 15 to 25 percent in the lower subsoil. Smectitic means the clay is dominated by smectite, the most swelling clay family.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#what-soils-are-found-in-the-lawton-area","section":"geology","topic":"Wichita granite and outwash"},{"question":"Wichita granite and outwash: What does this mean for foundations?","answer":"Smectitic clay with wide cracks and slickensides in Foard and Hollister, and deeply cracking clay in Tillman, shrinks during dry periods and swells when wet. In this setting, slab edges can drop in drought and rise in wet spells.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#what-does-this-mean-for-foundations","section":"geology","topic":"Wichita granite and outwash"},{"question":"How old is the Wichita Mountains granite?","answer":"The granite formed about 525 million years ago and was uplifted into mountains about 315 million years ago, according to the Oklahoma Geological Survey.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#faq-1","section":"geology","topic":"Wichita granite and outwash"},{"question":"What is granite wash?","answer":"Granite wash is coarse sediment worn off the granite mountains and carried outward by streams. Around the Wichitas, old granitic outwash lies over Permian red-bed clays, and soils like Foard formed in that mix.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#faq-2","section":"geology","topic":"Wichita granite and outwash"},{"question":"Wichita granite and outwash: Why are Foard soils a concern for foundations?","answer":"Foard is a smectitic clay with wide cracks and slickensides and a high-sodium subsoil. Water moves through it very slowly, and it can shrink and swell strongly with seasonal moisture.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#faq-3","section":"geology","topic":"Wichita granite and outwash"},{"question":"Is the granite itself a foundation problem?","answer":"Most homes near the Wichitas are built on the plains around the mountains, where the ground is outwash and red-bed clay rather than exposed granite. Those clay soils, such as Foard, Hollister and Tillman, are the main source of seasonal movement.","url":"https://terrabrain.vercel.app/geology/wichita-granite-and-granite-wash#faq-4","section":"geology","topic":"Wichita granite and outwash"},{"question":"How do you choose a foundation repair contractor in Oklahoma?","answer":"Oklahoma has no state foundation repair license. Check city registration and insurance, permits, an engineer's plan, written scope and warranty, and complaints.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma","section":"rules"},{"question":"Is there an Oklahoma license for foundation repair?","answer":"The Oklahoma Construction Industries Board licenses plumbers, electricians, mechanical tradespeople, home inspectors and building inspectors, and registers roofing contractors; foundation repair is not on that list.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#is-there-an-oklahoma-license-for-foundation-repair","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: Who pulls the permit?","answer":"The FTC lists a contractor asking the homeowner to get the building permits as a warning sign; Consumer guidance from the Better Business Bureau says to confirm the contractor can obtain the required permits; In Oklahoma City, contractor registration is tied to work that needs a building permit.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#who-pulls-the-permit","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: Is an engineer's evaluation part of the process?","answer":"Oklahoma's engineering board published compliance guidelines for foundation repair companies: - A homeowner can start with a repair company that brings in a professional engineer (PE), a company that employs a full-time PE, or an independent engineer who works directly for the owner. - The PE visits the site or directs a technician, then issues a signed, sealed and dated repair plan, or a sealed statement that no repair or a non-pier repair is needed. - The repair company carries out the PE's plan. - A PE may issue an engineering completion letter only after being on site or receiving enough information from a qualified technician.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#is-an-engineer-s-evaluation-part-of-the-process","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: What goes in the written proposal and contract?","answer":"The contractor's name, address, phone number and license number, plus estimated start and completion dates; Written estimates that describe the work, materials and completion date, with any verbal promises written in and no blank spaces left; Changes to the work agreed in writing before work continues.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#what-goes-in-the-written-proposal-and-contract","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: How do Oklahoma lien rules apply?","answer":"A mechanic's lien is a claim against the property by someone who supplied labor or materials and was not paid.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#how-do-oklahoma-lien-rules-apply","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: Can a contract signed at home be cancelled?","answer":"Under the FTC Cooling-Off Rule: - Covered sales made at the buyer's home can be cancelled for a full refund until midnight of the third business day; Saturdays count as business days. - The seller must explain the right and provide two cancellation forms and a dated contract or receipt. - Sales needed to meet an emergency, and repairs the buyer asked the seller to come to the home to do, are not covered, although extra items bought beyond that request are. - After cancellation, the seller has 10 days to refund payments.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#can-a-contract-signed-at-home-be-cancelled","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: Where can complaints be checked?","answer":"The Oklahoma Attorney General's Consumer Protection Unit mediates consumer complaints and can take legal action over deceptive or unfair practices; complaints are filed by phone or by emailing a complaint form; Better Business Bureau profiles show ratings, reviews, complaint history and licensing information; The FTC suggests checking with consumer protection officials and searching the company name with words like \"complaint\".","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#where-can-complaints-be-checked","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: What can you ask about piers, testing and logs?","answer":"What pier or pile type is proposed, and how is final depth decided? See steel push piers; Will each pier's depth and final pressure be recorded on an installation log given to the owner?; Is the plan sealed by an engineer, and who issues the completion letter ?.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#what-can-you-ask-about-piers-testing-and-logs","section":"rules","topic":"Choosing a repair contractor"},{"question":"Does Oklahoma license foundation repair contractors?","answer":"Foundation repair is not among the trades the Construction Industries Board licenses or registers. Cities can set their own rules; Oklahoma City requires building contractor registration, with liability insurance and workers' compensation coverage or an exemption, for work that needs a building permit.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#faq-1","section":"rules","topic":"Choosing a repair contractor"},{"question":"Can I cancel a foundation repair contract I signed at home?","answer":"The FTC Cooling-Off Rule generally allows cancellation of covered home sales until midnight of the third business day, but it does not cover repairs the buyer asked the seller to come to the home to do, except for extra items bought beyond that request.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#faq-2","section":"rules","topic":"Choosing a repair contractor"},{"question":"Where can I check complaints about a contractor in Oklahoma?","answer":"The Oklahoma Attorney General's Consumer Protection Unit takes and mediates consumer complaints, and Better Business Bureau profiles show complaint history and reviews. The FTC also suggests checking with consumer protection officials.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#faq-3","section":"rules","topic":"Choosing a repair contractor"},{"question":"Choosing a repair contractor: What is a pre-lien notice in Oklahoma?","answer":"It is a notice an unpaid contractor or supplier sends to the original contractor and the owner no later than 75 days after last supplying work or materials. On owner-occupied homes it is required regardless of the amount, and a lien is invalid without it.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#faq-4","section":"rules","topic":"Choosing a repair contractor"},{"question":"Should a foundation repair plan come from an engineer?","answer":"Oklahoma's engineering board guidelines describe a professional engineer reviewing site information and issuing a signed, sealed and dated repair plan, which the repair company then carries out. A homeowner can also hire an engineer directly.","url":"https://terrabrain.vercel.app/rules/how-to-choose-a-foundation-repair-contractor-in-oklahoma#faq-5","section":"rules","topic":"Choosing a repair contractor"},{"question":"How do you tell foundation heave from settlement?","answer":"Heave is ground rising, usually as clay takes on water; settlement is ground dropping. Floor surveys over time, the season and water sources tell them apart.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement","section":"guides"},{"question":"What are heave and settlement?","answer":"Post-Tensioning Institute (PTI) evaluation guidelines define heave as upward movement of an underlying supporting soil layer and settlement as downward movement of that layer. On expansive clay, heave happens when moisture is added and shrinkage happens when moisture is removed.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#what-are-heave-and-settlement","section":"guides","topic":"Heave vs settlement"},{"question":"What drives heave and settlement?","answer":"Some notes on the table:","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#what-drives-heave-and-settlement","section":"guides","topic":"Heave vs settlement"},{"question":"Heave vs settlement: Why is a single survey not enough?","answer":"An elevation survey maps high and low areas, but PTI notes that unless a benchmark is used, contours alone do not show whether heave or subsidence occurred. A center that reads high could be a center that rose, or edges that fell.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#why-is-a-single-survey-not-enough","section":"guides","topic":"Heave vs settlement"},{"question":"Heave vs settlement: Which tests help decide?","answer":"Plumbing tests. ASCE Texas guidelines list plumbing testing as part of a more detailed investigation and say water supply and drain lines should be tested for leaks if lifting is part of the repair.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#which-tests-help-decide","section":"guides","topic":"Heave vs settlement"},{"question":"Heave vs settlement: Why does the call matter?","answer":"Lifting is aimed at raising low areas. If a high area is high because it heaved, raising the surrounding foundation does not address the added water that caused it.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#why-does-the-call-matter","section":"guides","topic":"Heave vs settlement"},{"question":"What is the difference between heave and settlement?","answer":"Heave is upward movement of the soil supporting a foundation, usually from clay taking on water. Settlement is downward movement, often from clay drying and shrinking or from soft or poorly compacted soil compressing.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#faq-1","section":"guides","topic":"Heave vs settlement"},{"question":"Heave vs settlement: Why does it matter which one is happening?","answer":"The fixes are different. Settlement is often addressed by supporting or lifting the low areas, while heave is driven by added water, so finding and stopping the water source is central. Lifting a foundation also calls for testing plumbing lines for leaks.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#faq-2","section":"guides","topic":"Heave vs settlement"},{"question":"Can a floor survey tell heave from settlement?","answer":"A single survey shows high and low areas but, without a fixed benchmark, not which areas moved up or down. Comparing surveys taken at different times shows the actual direction of movement.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#faq-3","section":"guides","topic":"Heave vs settlement"},{"question":"Can removing a tree cause heave?","answer":"Yes. Engineering guidelines note that removing a large tree can let soil rewet and swell, and may recommend waiting before repair to allow for that heave.","url":"https://terrabrain.vercel.app/guides/heave-vs-settlement#faq-4","section":"guides","topic":"Heave vs settlement"},{"question":"How does a pier and beam crawl space foundation work?","answer":"The house sits on a raised wood floor over a crawl space, with a perimeter footing and wall and interior piers carrying beams and joists.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space","section":"foundations"},{"question":"What are the parts of a pier and beam system?","answer":"The sill plate is held by anchor bolts at least 1/2 in in diameter, no more than 6 ft apart, embedded at least 7 in, with a bolt within 12 in of each plate end.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#what-are-the-parts-of-a-pier-and-beam-system","section":"foundations","topic":"Pier and beam foundations"},{"question":"Pier and beam foundations: What are the code rules for the crawl space?","answer":"Vented crawl spaces: at least 1 sq ft of net vent area per 150 sq ft of crawl, with one opening within 3 ft of each outside corner; 1 per 1,500 sq ft when a Class I vapor retarder covers the ground; Unvented crawl spaces: a continuous Class I vapor retarder over all exposed earth, seams lapped 6 in, plus mechanical exhaust, conditioned air or dehumidification; Access: floor hatches at least 18 x 24 in; wall openings at least 16 x 24 in.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#what-are-the-code-rules-for-the-crawl-space","section":"foundations","topic":"Pier and beam foundations"},{"question":"How do pier and beam foundations fail?","answer":"Seasonal moisture change in clay can reach from 3 to 40 ft deep, so shallow interior pads sit well inside the moving layer.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#how-do-pier-and-beam-foundations-fail","section":"foundations","topic":"Pier and beam foundations"},{"question":"Why does pier and beam suit clay country?","answer":"Engineering guidance for swelling soils notes that structural above-grade flooring is available for consideration under certain conditions.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#why-does-pier-and-beam-suit-clay-country","section":"foundations","topic":"Pier and beam foundations"},{"question":"What is a pier and beam foundation?","answer":"It is a raised wood floor carried by beams on interior piers, with a perimeter footing and wall around the outside, leaving a crawl space under the house.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#faq-1","section":"foundations","topic":"Pier and beam foundations"},{"question":"Pier and beam foundations: How much ventilation does a vented crawl space need?","answer":"The residential code calls for at least 1 square foot of net vent area for each 150 square feet of crawl space, reduced to 1 per 1,500 where a Class I vapor retarder covers the ground, with an opening within 3 feet of each corner.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#faq-2","section":"foundations","topic":"Pier and beam foundations"},{"question":"Why do floors sag in the middle of a pier and beam house?","answer":"Interior piers rest on shallow pads in clay that shrinks and swells with the seasons, and wood shims and framing can crush or decay. Either can let the beams and joists drop between supports.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#faq-3","section":"foundations","topic":"Pier and beam foundations"},{"question":"Can a pier and beam house be re-leveled?","answer":"Yes. Because the floor sits on piers and shims that can be reached from the crawl space, supports can be adjusted after the soil moves, which is not possible under a concrete slab.","url":"https://terrabrain.vercel.app/foundations/pier-and-beam-crawl-space#faq-4","section":"foundations","topic":"Pier and beam foundations"},{"question":"How does Arbuckle limestone affect Oklahoma foundations?","answer":"Hard Arbuckle limestone and dolomite surface in south-central Oklahoma. Shallow rock and karst, not clay swell, are the main foundation questions there.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates","section":"geology"},{"question":"What is the Arbuckle rock?","answer":"Carbonate rock means limestone (calcium carbonate) and dolomite (calcium-magnesium carbonate). The Arbuckle rocks were deposited in shallow seas.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#what-is-the-arbuckle-rock","section":"geology","topic":"Arbuckle limestone"},{"question":"Arbuckle limestone: What is karst?","answer":"Karst is ground shaped by rock that dissolves in water, producing features such as cavities, sinkholes, caves, disappearing streams and springs.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#what-is-karst","section":"geology","topic":"Arbuckle limestone"},{"question":"What does Arbuckle rock mean for foundations?","answer":"On this ground, the key questions are what lies directly under the footing (sound rock, soil, or a soil-filled opening) and whether roof or yard water is being concentrated into fractures in the rock; Sudden, localized drops are a sign worth separating from slow seasonal movement.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#what-does-arbuckle-rock-mean-for-foundations","section":"geology","topic":"Arbuckle limestone"},{"question":"How is deep Arbuckle rock tied to earthquakes?","answer":"The same rock group extends deep underground in other parts of Oklahoma. That deep setting is discussed separately in induced seismicity in Oklahoma and seismic damage vs. soil movement.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#how-is-deep-arbuckle-rock-tied-to-earthquakes","section":"geology","topic":"Arbuckle limestone"},{"question":"Arbuckle limestone: Where can I read more?","answer":"The South-Central (Arbuckles and Texoma) region page covers the soils and other rock units around the Arbuckle uplift, and gypsum karst and sinkholes explains the different, faster-dissolving karst of western Oklahoma.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#where-can-i-read-more","section":"geology","topic":"Arbuckle limestone"},{"question":"What are the Arbuckle carbonates?","answer":"They are thick beds of limestone and dolomite laid down in shallow seas during the Cambrian and Ordovician periods. They are exposed at the surface in the Arbuckle Mountains of south-central Oklahoma.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#faq-1","section":"geology","topic":"Arbuckle limestone"},{"question":"Are there sinkholes in the Arbuckle Mountains area?","answer":"The Arbuckle Mountains are one of the two main limestone and dolomite karst areas in Oklahoma. Small karst features are found across much of the outcrop, but large open caves are known in only a few places.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#faq-2","section":"geology","topic":"Arbuckle limestone"},{"question":"Arbuckle limestone: Is the rock close to the surface?","answer":"In the outcrop belt the rock is uniformly hard and crops out at the surface, where tilted limestone layers form rows of outcrops sometimes called tombstone topography.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#faq-3","section":"geology","topic":"Arbuckle limestone"},{"question":"How does Arbuckle rock relate to Oklahoma earthquakes?","answer":"The deep Arbuckle Group is a separate topic from the surface outcrop. See the induced seismicity guide for how deep rock layers relate to Oklahoma earthquakes.","url":"https://terrabrain.vercel.app/geology/arbuckle-carbonates#faq-4","section":"geology","topic":"Arbuckle limestone"},{"question":"How does crawl space moisture cause wood rot and sagging floors?","answer":"Water and humid air in a crawl space raise wood moisture until decay fungi grow, weakening sills, joists and beams so floors feel soft, bouncy or sag.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay","section":"causes"},{"question":"What happens when a crawl space stays damp?","answer":"A crawl space is the shallow open area between the ground and the wood floor of a pier-and-beam house. InterNACHI's guide to the International Residential Code (IRC) section R408 states that the main objective of the crawl space rules is moisture control.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#what-happens-when-a-crawl-space-stays-damp","section":"causes","topic":"Crawl space moisture and rot"},{"question":"Crawl space moisture and rot: When does wood start to decay?","answer":"Wood decay is caused by fungi, and they need four things: food (the wood itself), oxygen, a suitable temperature and enough moisture. The details:","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#when-does-wood-start-to-decay","section":"causes","topic":"Crawl space moisture and rot"},{"question":"Crawl space moisture and rot: How does wood rot affect the floor?","answer":"As decay fungi break down wood, the wood loses strength. The framing at risk in a crawl space includes the sill plate (the board resting on the foundation wall), the floor joists and the beams or girders that carry them.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#how-does-wood-rot-affect-the-floor","section":"causes","topic":"Crawl space moisture and rot"},{"question":"What Oklahoma conditions add to crawl space moisture?","answer":"Oklahoma's climate ranges from humid subtropical in the east to semi-arid in the west. Because humid outdoor air entering vents is itself a moisture source, local humidity matters. See the Tulsa metro region page and groundwater and perched water for local conditions.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#what-oklahoma-conditions-add-to-crawl-space-moisture","section":"causes","topic":"Crawl space moisture and rot"},{"question":"Crawl space moisture and rot: What does the building code require?","answer":"The code also calls for removing vegetation, organic material and wood forms from the crawl space, and for drainage or a raised grade where groundwater can rise within 6 inches of the floor or the space does not drain.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#what-does-the-building-code-require","section":"causes","topic":"Crawl space moisture and rot"},{"question":"How is crawl space moisture typically addressed?","answer":"Remove the water. Bulk water entering the crawl space is one of the main moisture sources, which is why grading and drainage are addressed first; see drainage solutions; Control humidity.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#how-is-crawl-space-moisture-typically-addressed","section":"causes","topic":"Crawl space moisture and rot"},{"question":"At what moisture level does wood start to rot?","answer":"Wood decay is generally understood to occur above about 30% moisture content and not below about 20%. Air-dried wood usually stays at or below about 20%, which is why dry framing does not rot.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#faq-1","section":"causes","topic":"Crawl space moisture and rot"},{"question":"Why is my crawl space wet in summer when it has not rained?","answer":"Humid outdoor air entering through crawl space vents in summer can condense on cooler surfaces such as ducts, pipes and framing. That condensation adds moisture to the crawl space even without rain.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#faq-2","section":"causes","topic":"Crawl space moisture and rot"},{"question":"What does the building code say about crawl space ventilation?","answer":"The International Residential Code section R408 requires at least 1 square foot of vent area per 150 square feet of crawl space, reduced to 1 per 1,500 with a Class I vapor retarder on the ground, or allows unvented crawl spaces with a sealed vapor retarder and air conditioning, exhaust or dehumidification.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#faq-3","section":"causes","topic":"Crawl space moisture and rot"},{"question":"Crawl space moisture and rot: Can rotted floor framing be repaired?","answer":"Yes. Texas engineering guidelines for pier-and-beam homes list shimming, framing repairs, added supports and crawl space moisture control among the repair approaches.","url":"https://terrabrain.vercel.app/causes/crawl-space-moisture-and-wood-decay#faq-4","section":"causes","topic":"Crawl space moisture and rot"},{"question":"How does erosion leave voids under a foundation or slab?","answer":"Runoff, flooding or a leaking pipe can carry soil from beside or under a foundation, leaving a void where the concrete above can crack or settle.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids","section":"causes"},{"question":"Erosion and washout voids: How does water remove soil from under a foundation?","answer":"Water that is concentrated, such as at a downspout outlet, along a low spot against the house, or at a broken pipe, can pick up soil particles and move them.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#how-does-water-remove-soil-from-under-a-foundation","section":"causes","topic":"Erosion and washout voids"},{"question":"Erosion and washout voids: Which soils erode easily?","answer":"Some soils are far more erodible than others.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#which-soils-erode-easily","section":"causes","topic":"Erosion and washout voids"},{"question":"What are the signs of erosion voids?","answer":"an exposed slab edge or void under a footing; visible slab cracks over an unsupported area; heaved or settled flatwork such as sidewalks and patios.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#what-are-the-signs-of-erosion-voids","section":"causes","topic":"Erosion and washout voids"},{"question":"How do erosion voids differ from karst sinkholes?","answer":"Karst sinkholes form when soluble bedrock such as limestone, gypsum or salt dissolves and the ground above collapses into the cavity. Erosion voids form in the soil itself, close to the surface, where water carries particles away.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#how-do-erosion-voids-differ-from-karst-sinkholes","section":"causes","topic":"Erosion and washout voids"},{"question":"How are erosion voids typically addressed?","answer":"Stop the water first. Leaks are found with testing; the EPA's meter test (read the meter, use no water for two hours, read again) checks supply lines, and Texas engineering guidelines call for testing supply and drain lines whenever a foundation will be lifted.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#how-are-erosion-voids-typically-addressed","section":"causes","topic":"Erosion and washout voids"},{"question":"Erosion and washout voids: Can water wash soil out from under a slab?","answer":"Yes. Water moving through or along the soil can carry particles away and leave voids. After the heavy April 2025 rains, the Oklahoma Geological Survey expected most new sinkholes to be small and to appear where water had flowed beneath roads and driveways.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#faq-1","section":"causes","topic":"Erosion and washout voids"},{"question":"Erosion and washout voids: What is a dispersive soil?","answer":"A dispersive soil is a clay whose particles break apart and wash away easily in water, usually because sodium dominates its pore water. Small leaks through dispersive soil can enlarge into pipes or tunnels, and at least two Oklahoma flood-control dams have failed this way.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#faq-2","section":"causes","topic":"Erosion and washout voids"},{"question":"How is an erosion void different from a karst sinkhole?","answer":"An erosion void forms in the soil near the surface where runoff or leaking water carries particles away. A karst sinkhole forms when soluble bedrock such as gypsum or limestone dissolves and the material above it collapses into the cavity.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#faq-3","section":"causes","topic":"Erosion and washout voids"},{"question":"Erosion and washout voids: How do I know if a leak is washing out soil under my house?","answer":"A whole-house meter test can reveal a supply leak: read the meter, use no water for two hours and read it again. Drain lines need separate testing, which Texas engineering guidelines call for before any foundation lifting.","url":"https://terrabrain.vercel.app/causes/erosion-undermining-and-washout-voids#faq-4","section":"causes","topic":"Erosion and washout voids"},{"question":"How does Garber Sandstone affect Oklahoma foundations near OKC?","answer":"It weathers into loamy, well-drained soils often shallow to soft rock that swell less than red clays, so drainage, erosion and shallow rock matter most.","url":"https://terrabrain.vercel.app/geology/garber-sandstone","section":"geology"},{"question":"What is the Garber Sandstone?","answer":"The Garber Sandstone is an early Permian rock unit, deposited in a delta setting, made of lens-shaped beds of sandstone, shale and siltstone.","url":"https://terrabrain.vercel.app/geology/garber-sandstone#what-is-the-garber-sandstone","section":"geology","topic":"Garber Sandstone"},{"question":"What soils form on Garber sandstone?","answer":"Darnell formed in Permian sandstone on ridge crests and upper hill slopes; Stephenville formed in material weathered from Permian sandstone on hill backslopes; Zaneis formed in residuum from interbedded Permian sandstone and shale on low hills, and its subsoil is fine-loamy.","url":"https://terrabrain.vercel.app/geology/garber-sandstone#what-soils-form-on-garber-sandstone","section":"geology","topic":"Garber Sandstone"},{"question":"What does Garber sandstone mean for foundations?","answer":"The Garber soils above are classed as loamy or fine-loamy, not clayey. However, the Garber itself contains shale and siltstone lenses, and Zaneis and Lucien formed partly from shale or clay layers.","url":"https://terrabrain.vercel.app/geology/garber-sandstone#what-does-garber-sandstone-mean-for-foundations","section":"geology","topic":"Garber Sandstone"},{"question":"Where is the Garber Sandstone at the surface?","answer":"It crops out on the east side of Oklahoma County. The rock layers dip west, so on the west side of the county the Garber lies under hundreds of feet of Hennessey shale.","url":"https://terrabrain.vercel.app/geology/garber-sandstone#faq-1","section":"geology","topic":"Garber Sandstone"},{"question":"Do Garber Sandstone soils swell like red clay?","answer":"Soils formed on Garber sandstone, such as Darnell, Lucien, Stephenville and Zaneis, are loamy and well drained. They generally move less than the clay soils on Hennessey shale, but clay and shale layers within the sandstone can still produce clayey spots.","url":"https://terrabrain.vercel.app/geology/garber-sandstone#faq-2","section":"geology","topic":"Garber Sandstone"},{"question":"Is the Garber the same as the Garber-Wellington aquifer?","answer":"The Garber Sandstone and the Wellington Formation together make up the main water-bearing part of the Central Oklahoma aquifer, often called the Garber-Wellington aquifer.","url":"https://terrabrain.vercel.app/geology/garber-sandstone#faq-3","section":"geology","topic":"Garber Sandstone"},{"question":"How deep is rock on Garber soils?","answer":"It varies by series. Darnell and Lucien reach soft sandstone at about 10 to 20 inches, Stephenville at 20 to 40 inches, and Zaneis at about 40 to 60 inches.","url":"https://terrabrain.vercel.app/geology/garber-sandstone#faq-4","section":"geology","topic":"Garber Sandstone"},{"question":"How does grouting fill voids under a foundation?","answer":"Cement-based grout is pumped under pressure to fill voids or densify loose soil; larger voids, fill or sinkholes are normally grouted to an engineer's design.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting","section":"repairs"},{"question":"What kinds of grouting are there?","answer":"These descriptions are general terms used in ground improvement. Which type fits a site depends on what the investigation finds.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#what-kinds-of-grouting-are-there","section":"repairs","topic":"Void and compaction grouting"},{"question":"Where do voids come from?","answer":"Erosion and leaks. Running water from leaking pipes, downspouts or poor drainage can carry soil away from under a slab edge; see erosion, undermining and washout voids and exposed slab edge or void under footing; Loose or decaying fill.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#where-do-voids-come-from","section":"repairs","topic":"Void and compaction grouting"},{"question":"Void and compaction grouting: Where do sinkholes and karst occur in Oklahoma?","answer":"A sinkhole is a ground depression with no surface drainage outlet, where water drains underground. USGS describes two common types:","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#where-do-sinkholes-and-karst-occur-in-oklahoma","section":"repairs","topic":"Void and compaction grouting"},{"question":"How are voids found before grouting?","answer":"Engineering guidance describes several ways to locate voids under a slab:","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#how-are-voids-found-before-grouting","section":"repairs","topic":"Void and compaction grouting"},{"question":"Void and compaction grouting: What are the risks and limits?","answer":"Pressure grouting under a slab carries the same installation risks reported for mudjacking: too much material can bulge or crack the slab, excessive pressure can cause blowouts, and grout can enter and plug cracked utility lines.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#what-are-the-risks-and-limits","section":"repairs","topic":"Void and compaction grouting"},{"question":"What is the difference between void filling and compaction grouting?","answer":"Void filling pumps grout into empty spaces under a slab or footing. Compaction grouting injects a stiff grout under pressure that pushes surrounding loose soil aside and densifies it, and is normally an engineered ground-improvement method.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#faq-1","section":"repairs","topic":"Void and compaction grouting"},{"question":"How are voids under a slab found?","answer":"Engineering test methods include ground penetrating radar, hammer sounding of the slab, impact-echo testing, electrical resistivity surveys, test openings and soil borings. Each has limits, so results are usually checked against borings or openings.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#faq-2","section":"repairs","topic":"Void and compaction grouting"},{"question":"Void and compaction grouting: Does Oklahoma have sinkholes?","answer":"Yes. The Oklahoma Geological Survey reports karst in limestone and dolomite mainly in the Ozarks, the Arbuckle Mountains and the Limestone Hills north of the Wichita Mountains, and gypsum and shallow salt in many areas of western Oklahoma.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#faq-3","section":"repairs","topic":"Void and compaction grouting"},{"question":"Can grouting damage a foundation?","answer":"Yes. Uncontrolled grout pressure or volume can lift or crack a slab, cause blowouts, or flow into and plug damaged utility lines.","url":"https://terrabrain.vercel.app/repairs/void-and-compaction-grouting#faq-4","section":"repairs","topic":"Void and compaction grouting"},{"question":"How does limestone north of Tulsa affect Oklahoma foundations?","answer":"Pennsylvanian limestone beds can weather into Apperson soil, a very expansive clay over hard limestone about 3.5 to 5 feet down.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones","section":"geology"},{"question":"Pennsylvanian limestones: What are the rock layers?","answer":"In northeastern Oklahoma, Pennsylvanian limestone and shale units alternate: the Oologah limestone is 80 to 145 feet thick, while the Nowata shale above it ranges from 50 to 600 feet.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#what-are-the-rock-layers","section":"geology","topic":"Pennsylvanian limestones"},{"question":"Pennsylvanian limestones: What is Apperson clay on limestone?","answer":"The Apperson series is the main soil formed from this limestone:","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#what-is-apperson-clay-on-limestone","section":"geology","topic":"Pennsylvanian limestones"},{"question":"Pennsylvanian limestones: What does this mean for foundations?","answer":"Seasonal shrink-swell. Smectite clay above the rock has cracks that open and close periodically, and clayey soils swell as they take on water. Soil under a slab edge can drop in drought and rise when rain returns.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#what-does-this-mean-for-foundations","section":"geology","topic":"Pennsylvanian limestones"},{"question":"Pennsylvanian limestones: Is karst a concern?","answer":"Limestone can dissolve and form karst features. The Oklahoma Geological Survey identifies the Ozark area in the northeast and the Arbuckle Mountains in the south as the state's main limestone and dolomite karst areas. See karst subsidence and sinkholes.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#is-karst-a-concern","section":"geology","topic":"Pennsylvanian limestones"},{"question":"Where are Pennsylvanian limestones near Tulsa?","answer":"Limestone units such as the Oologah occur in the prairie country of northeastern Oklahoma, in a belt running south from the Kansas line. They alternate with shale formations such as the Nowata, reported at 50 to 600 feet thick.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#faq-1","section":"geology","topic":"Pennsylvanian limestones"},{"question":"Pennsylvanian limestones: Can limestone produce expansive clay?","answer":"Yes. The Apperson soil formed in calcareous residuum from Pennsylvanian limestone, and its subsoil is smectitic silty clay with cracks that open and close and slickensides. It is classed as a Vertisol, the soil order defined by shrink-swell.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#faq-2","section":"geology","topic":"Pennsylvanian limestones"},{"question":"Pennsylvanian limestones: How deep is the rock under Apperson soils?","answer":"Hard limestone is 40 to 60 inches below the surface, about 44 inches in the typical profile. That is shallow enough to matter for footings but still leaves several feet of very expansive clay above it.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#faq-3","section":"geology","topic":"Pennsylvanian limestones"},{"question":"Do these limestones form sinkholes?","answer":"The Oklahoma Geological Survey names the Ozark area in the northeast and the Arbuckle Mountains in the south as the state's main limestone and dolomite karst areas. Any sudden local depression should still be checked on its own merits.","url":"https://terrabrain.vercel.app/geology/pennsylvanian-limestones#faq-4","section":"geology","topic":"Pennsylvanian limestones"},{"question":"How does the moisture index change across Oklahoma?","answer":"The Thornthwaite Moisture Index weighs rainfall against evaporation. Oklahoma gets drier east to west, and drier climates generally drive soil drying deeper.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city","section":"data"},{"question":"What is the Thornthwaite Moisture Index?","answer":"The TMI compares a location's yearly precipitation with its potential evapotranspiration, the amount of water that would evaporate from soil and pass through plants if water were always available.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#what-is-the-thornthwaite-moisture-index","section":"data","topic":"Moisture index by city"},{"question":"Moisture index by city: How does Oklahoma's climate change from east to west?","answer":"No verified city-by-city TMI table was found for this page. The ODOT-sponsored study instead mapped TMI statewide with three calculation methods and found that the zero TMI line runs across central Oklahoma, so the climate there ranges from moist sub-humid to dry sub-humid.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#how-does-oklahoma-s-climate-change-from-east-to-west","section":"data","topic":"Moisture index by city"},{"question":"Moisture index by city: What does this mean for each region?","answer":"Tulsa and northeast Oklahoma sit at the wetter, lower-evaporation end of the state. See Tulsa metro; Oklahoma City lies in central Oklahoma, near the zero TMI line between moist and dry sub-humid climates.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#what-does-this-mean-for-each-region","section":"data","topic":"Moisture index by city"},{"question":"What is the Thornthwaite Moisture Index?","answer":"It is a climate number that compares how much rain an area gets with how much water the climate could evaporate and plants could use. Positive values mean a wetter climate and negative values a drier one.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#faq-1","section":"data","topic":"Moisture index by city"},{"question":"Moisture index by city: Is western Oklahoma drier than eastern Oklahoma for foundations?","answer":"Yes. OSU Extension reports May to October evaporation of about 28 to 30 inches in eastern Oklahoma versus about 40 to 44 inches in the southwest, west-central and Panhandle divisions.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#faq-2","section":"data","topic":"Moisture index by city"},{"question":"Why do engineers care about the moisture index?","answer":"Slab design methods for expansive clay use a climate moisture index to estimate how deep and how far in from the slab edge soil moisture will change. Drier climates generally mean deeper seasonal drying.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#faq-3","section":"data","topic":"Moisture index by city"},{"question":"Is there an official Oklahoma table of moisture index by city?","answer":"This site did not find a published city-by-city table it could verify. A 2014 ODOT-sponsored study published statewide TMI contour maps instead, and values used in design are usually read from such maps or calculated for the site.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#faq-4","section":"data","topic":"Moisture index by city"},{"question":"What is the moisture index in central Oklahoma?","answer":"A 2014 ODOT-sponsored study found the zero TMI line runs across central Oklahoma, so the climate there ranges from moist sub-humid to dry sub-humid.","url":"https://terrabrain.vercel.app/data/moisture-index-by-city#faq-5","section":"data","topic":"Moisture index by city"},{"question":"How does the Wellington Formation affect Oklahoma foundations?","answer":"Wellington layers shift quickly from sand to clay, so soils range from shallow and loamy to deep and highly expansive and must be judged lot by lot.","url":"https://terrabrain.vercel.app/geology/wellington-formation","section":"geology"},{"question":"What is the Wellington Formation rock?","answer":"The Wellington Formation is made of sands, shales and mudstones. A USGS review describes the Wellington and Garber as interbedded, lens-shaped sandstone, shale and siltstone deposited in similar delta environments during the early Permian.","url":"https://terrabrain.vercel.app/geology/wellington-formation#what-is-the-wellington-formation-rock","section":"geology","topic":"Wellington Formation"},{"question":"What soils form on the Wellington Formation?","answer":"Vertic features, such as wide cracks and slickensides (polished shear faces in clay), are the soil survey's signs of strong shrink-swell. Renfrow's description requires cracks at least 5 millimeters wide within about 4 feet of the surface for part of most years.","url":"https://terrabrain.vercel.app/geology/wellington-formation#what-soils-form-on-the-wellington-formation","section":"geology","topic":"Wellington Formation"},{"question":"What does the Wellington Formation mean for foundations?","answer":"On Renfrow and Kirkland, slow-draining clay with slickensides shrinks in drought and swells when wet. Renfrow has low saturated hydraulic conductivity and high runoff, so water tends to run off rather than soak in evenly.","url":"https://terrabrain.vercel.app/geology/wellington-formation#what-does-the-wellington-formation-mean-for-foundations","section":"geology","topic":"Wellington Formation"},{"question":"What is the Wellington Formation?","answer":"It is an early Permian rock unit of sands, shales and mudstones in central Oklahoma. Together with the Garber Sandstone it forms the main water-bearing part of the Central Oklahoma aquifer.","url":"https://terrabrain.vercel.app/geology/wellington-formation#faq-1","section":"geology","topic":"Wellington Formation"},{"question":"Are Wellington soils sandy or clayey?","answer":"Both. Because the rock mixes sandstone and shale in lens-shaped beds, soils on it range from shallow, loamy soils like Lucien to deep, expansive clays like Renfrow.","url":"https://terrabrain.vercel.app/geology/wellington-formation#faq-2","section":"geology","topic":"Wellington Formation"},{"question":"Wellington Formation: How can I tell what is under my lot?","answer":"Check the USDA Web Soil Survey for the mapped soil series. A clay series such as Renfrow and a shallow loamy series such as Lucien behave very differently even a short distance apart.","url":"https://terrabrain.vercel.app/geology/wellington-formation#faq-3","section":"geology","topic":"Wellington Formation"},{"question":"How does yard drainage and grading affect an Oklahoma foundation?","answer":"On expansive clay, slopes toward the house, downspouts at the wall and sprinklers wet soil unevenly and drive movement; fixing drainage is a first step.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading","section":"guides"},{"question":"Why does surface water matter?","answer":"Expansive clay swells when water enters it and shrinks when it dries, and uneven moisture under a slab causes differential movement, where one part of the house moves more than another.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading#why-does-surface-water-matter","section":"guides","topic":"Surface drainage and grading"},{"question":"What drainage problems are common on Oklahoma lots?","answer":"Signs that water is collecting include water ponding near the foundation and, after dry spells, soil pulled away from the foundation.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading#what-drainage-problems-are-common-on-oklahoma-lots","section":"guides","topic":"Surface drainage and grading"},{"question":"How does drainage connect to foundation movement?","answer":"Edge lift: when the perimeter gets wetter than the center, the edges can rise; see perimeter wetting heave; Edge drop: when the perimeter dries faster, the edges can fall; see perimeter drying settlement; Washouts: concentrated runoff can carry soil from under slab edges; see erosion, creeks and slopes.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading#how-does-drainage-connect-to-foundation-movement","section":"guides","topic":"Surface drainage and grading"},{"question":"Surface drainage and grading: Which way should the ground slope around my house?","answer":"Away from the foundation. The EPA advises making sure the ground slopes away from the building so water does not collect around the foundation.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading#faq-1","section":"guides","topic":"Surface drainage and grading"},{"question":"Surface drainage and grading: Where should downspouts drain?","answer":"EPA guidance describes redirecting downspouts to a rain barrel or to a lawn or garden where water can soak in, while considering where the water will go so it doesn't cause property damage.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading#faq-2","section":"guides","topic":"Surface drainage and grading"},{"question":"Surface drainage and grading: Can lawn sprinklers affect my foundation?","answer":"They can. Engineering sources list irrigation among the causes of uneven soil moisture under foundations on expansive clay, along with poor drainage, leaks and trees.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading#faq-3","section":"guides","topic":"Surface drainage and grading"},{"question":"Why does drainage matter so much on Oklahoma clay?","answer":"Expansive clay swells when wet and shrinks when dry. Water that collects along one side of a house wets that side more than the rest, which causes uneven movement.","url":"https://terrabrain.vercel.app/guides/surface-drainage-and-grading#faq-4","section":"guides","topic":"Surface drainage and grading"},{"question":"How far apart are foundation piers in Oklahoma?","answer":"Spacing depends on wall load, pier capacity and how far the beam can span. Oklahoma steel push piers are commonly set about 7 feet apart.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity","section":"guides"},{"question":"Pier spacing and capacity: Where does the load come from?","answer":"A house's weight reaches the soil through its perimeter beam or footing. Engineers express this as a line load: pounds per linear foot of wall. It adds up from the roof, the walls, the floors and the concrete itself. Brick veneer adds a large share.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#where-does-the-load-come-from","section":"guides","topic":"Pier spacing and capacity"},{"question":"How is pier spacing worked out?","answer":"In plain terms, spacing is limited by whichever of these runs out first: - Pier capacity. The load one pier can carry, divided by the line load, gives the longest spacing the pier allows. - Beam span. The concrete beam between two piers has to carry the wall like a bridge.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#how-is-pier-spacing-worked-out","section":"guides","topic":"Pier spacing and capacity"},{"question":"How is pressure read on a pier log?","answer":"A steel push pier is driven by a hydraulic ram that pushes against the weight of the house. The gauge pressure when the pier stops, multiplied by the ram piston's area, equals the force applied to the pier.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#how-is-pressure-read-on-a-pier-log","section":"guides","topic":"Pier spacing and capacity"},{"question":"Pier spacing and capacity: How does frost depth affect shallow systems?","answer":"Oklahoma's engineering board described common \"pier and grade beam\" systems: grade beams about 8 to 10 inches wide and 14 to 18 inches deep, on piers 8 to 10 inches in diameter, no more than about 36 inches deep and 6 to 8 feet apart.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#how-does-frost-depth-affect-shallow-systems","section":"guides","topic":"Pier spacing and capacity"},{"question":"Pier spacing and capacity: How does expansive clay cause uplift?","answer":"The active zone is the depth of soil whose moisture changes with the seasons. In that zone, swelling clay can grip a pier shaft and pull up on it.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#how-does-expansive-clay-cause-uplift","section":"guides","topic":"Pier spacing and capacity"},{"question":"What drives the number of piers?","answer":"Length of wall that has settled; Weight of the structure (one or two stories, brick or siding); Condition and reinforcing of the existing beam.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#what-drives-the-number-of-piers","section":"guides","topic":"Pier spacing and capacity"},{"question":"How far apart are foundation piers usually placed?","answer":"Oklahoma steel push pier records show exterior piers placed about every 7 feet along affected walls. The right spacing for a given house depends on the wall load, the pier capacity and how far the concrete beam can span between supports.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#faq-1","section":"guides","topic":"Pier spacing and capacity"},{"question":"What does the psi number on a pier log mean?","answer":"It is the hydraulic pressure in the driving ram when the pier stopped. Multiplying that pressure by the ram's piston area gives the force pushing on the pier, which is why the ram size must be recorded to turn psi into a load.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#faq-2","section":"guides","topic":"Pier spacing and capacity"},{"question":"Why does expansive clay matter for pier design?","answer":"Clay in the active zone swells and shrinks with moisture, and building codes require foundations placed in that zone to be designed to resist the resulting volume changes.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#faq-3","section":"guides","topic":"Pier spacing and capacity"},{"question":"Are shallow pier-and-grade-beam systems always adequate?","answer":"Not always. Oklahoma's engineering board described common shallow systems that sit above frost depth and showed by calculation that one typical layout could carry only about 5 to 6 feet of brick wall height before other loads were counted.","url":"https://terrabrain.vercel.app/guides/loads-pier-spacing-and-capacity#faq-4","section":"guides","topic":"Pier spacing and capacity"},{"question":"How far out of level can an Oklahoma foundation be?","answer":"There is no single allowed number. Engineers judge overall tilt, deflection and resulting distress against published guidelines.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards","section":"guides"},{"question":"Foundation tolerances: Why is \"level\" the wrong yardstick?","answer":"Forensic engineers point out that foundations are not built perfectly level, so a floor-level survey always mixes original construction variation with any movement since. Porches, patios and garages are often built with deliberate slopes for drainage.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#why-is-level-the-wrong-yardstick","section":"guides","topic":"Foundation tolerances"},{"question":"Foundation tolerances: What are tilt, deflection and distress?","answer":"Engineering guidelines separate two kinds of out-of-level: - Tilt: a plane sloping evenly across the whole foundation. - Deflection: how far the surface bows away from a straight line drawn between two points.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#what-are-tilt-deflection-and-distress","section":"guides","topic":"Foundation tolerances"},{"question":"Foundation tolerances: What does Oklahoma's residential code cover?","answer":"The Oklahoma Uniform Building Code Commission adopts the IRC statewide. The 2024 IRC with Oklahoma amendments took effect September 14, 2026. The prior 2018 edition with Oklahoma amendments had been effective since September 14, 2022.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#what-does-oklahoma-s-residential-code-cover","section":"guides","topic":"Foundation tolerances"},{"question":"Foundation tolerances: What does the code say about expansive soil?","answer":"Where data suggest expansive, compressible or shifting soils, the building official decides whether a soil test is required. Soil counts as expansive when all four of these are met, though the first three need not be tested if the fourth is run:","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#what-does-the-code-say-about-expansive-soil","section":"guides","topic":"Foundation tolerances"},{"question":"Foundation tolerances: Does a repair plan need an engineer's seal?","answer":"In Oklahoma, a foundation repair plan prepared by an engineer must be signed, sealed and dated, and the engineer keeps a design file with criteria, calculations and the cause of the damage. See working with engineers.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#does-a-repair-plan-need-an-engineer-s-seal","section":"guides","topic":"Foundation tolerances"},{"question":"Foundation tolerances: Is any house floor perfectly level?","answer":"No. Forensic engineering literature states that foundations are not constructed perfectly level, so an elevation survey shows original construction variation as well as later movement.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#faq-1","section":"guides","topic":"Foundation tolerances"},{"question":"What guidelines do engineers use to evaluate a residential foundation?","answer":"Commonly cited documents include the Texas Section of ASCE's Guidelines for the Evaluation and Repair of Residential Foundations and the Post-Tensioning Institute's guide for performance evaluation of slab-on-ground foundations, both of which look at deflection and distress.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#faq-2","section":"guides","topic":"Foundation tolerances"},{"question":"Foundation tolerances: Which building code applies to houses in Oklahoma?","answer":"The 2024 International Residential Code with Oklahoma amendments became the statewide minimum residential code on September 14, 2026, replacing the 2018 edition adopted in 2022.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#faq-3","section":"guides","topic":"Foundation tolerances"},{"question":"Foundation tolerances: How does the building code define expansive soil?","answer":"The residential code treats soil as expansive when it has a plasticity index of 15 or more, more than 10% passing a No. 200 sieve, more than 10% of particles finer than 5 micrometers, and an expansion index above 20; if the expansion index test is run, the other three are not required.","url":"https://terrabrain.vercel.app/guides/tolerances-and-standards#faq-4","section":"guides","topic":"Foundation tolerances"},{"question":"How far should trees be planted from a house in Oklahoma City?","answer":"Oklahoma City's planting guide keeps medium and large trees at least 30 feet from buildings; most roots are shallow but spread well beyond the canopy.","url":"https://terrabrain.vercel.app/data/trees","section":"data"},{"question":"OKC trees and planting distance: How much tree canopy does the OKC metro have?","answer":"The Association of Central Oklahoma Governments (ACOG) commissioned a canopy assessment of the Oklahoma City metropolitan area in 2019.","url":"https://terrabrain.vercel.app/data/trees#how-much-tree-canopy-does-the-okc-metro-have","section":"data","topic":"OKC trees and planting distance"},{"question":"What are the official planting distances?","answer":"The City of Oklahoma City's planting guide sets these distances:","url":"https://terrabrain.vercel.app/data/trees#what-are-the-official-planting-distances","section":"data","topic":"OKC trees and planting distance"},{"question":"OKC trees and planting distance: Where do tree roots grow?","answer":"The dripline is the outer edge of a tree's canopy. Because roots reach far past it, a tree that looks well clear of the house can still draw water from soil along the foundation, a process described in tree-root desiccation settlement.","url":"https://terrabrain.vercel.app/data/trees#where-do-tree-roots-grow","section":"data","topic":"OKC trees and planting distance"},{"question":"OKC trees and planting distance: What species traits does OSU Extension list?","answer":"OSU Extension's selection guide lists these traits for trees common in Oklahoma yards:","url":"https://terrabrain.vercel.app/data/trees#what-species-traits-does-osu-extension-list","section":"data","topic":"OKC trees and planting distance"},{"question":"Why do trees matter on Oklahoma clay?","answer":"Clay soils across central and eastern Oklahoma swell and shrink with moisture (see shrink-swell and active zone). A tree concentrated near one side of a house adds uneven drying on that side, and removing a large tree can lead to post-tree-removal heave as the soil rewets.","url":"https://terrabrain.vercel.app/data/trees#why-do-trees-matter-on-oklahoma-clay","section":"data","topic":"OKC trees and planting distance"},{"question":"What are the most common trees in the Oklahoma City metro?","answer":"A 2019 regional canopy assessment found eastern redcedar (13.2%), slippery elm (9.7%) and western soapberry (9.6%) were the most common species.","url":"https://terrabrain.vercel.app/data/trees#faq-1","section":"data","topic":"OKC trees and planting distance"},{"question":"OKC trees and planting distance: How much of the OKC metro is covered by tree canopy?","answer":"The 2019 assessment of a 536-square-mile study area measured 22.4% tree canopy, with an estimated 65 million trees of 74 species.","url":"https://terrabrain.vercel.app/data/trees#faq-2","section":"data","topic":"OKC trees and planting distance"},{"question":"OKC trees and planting distance: How close to a house can I plant a large tree in Oklahoma City?","answer":"The city's planting guide says medium and large trees should be planted no closer than 30 feet to buildings or structures.","url":"https://terrabrain.vercel.app/data/trees#faq-3","section":"data","topic":"OKC trees and planting distance"},{"question":"OKC trees and planting distance: How deep are most tree roots?","answer":"OSU Extension says most trees grow a fibrous root system in the upper 24 inches of soil, and roots can spread up to three to five times the canopy width.","url":"https://terrabrain.vercel.app/data/trees#faq-4","section":"data","topic":"OKC trees and planting distance"},{"question":"How is a foundation elevation survey done?","answer":"Floor heights are measured from one reference point and mapped as contours, then tilt and deflection are checked against limits such as L/360 and 1 percent.","url":"https://terrabrain.vercel.app/guides/elevation-surveys","section":"guides"},{"question":"What does an elevation survey show?","answer":"A floor elevation survey records the shape of a foundation at one instant.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#what-does-an-elevation-survey-show","section":"guides","topic":"Foundation elevation surveys"},{"question":"Foundation elevation surveys: How are readings taken?","answer":"The Foundation Performance Association (FPA) guideline calls for a level-measuring device accurate to plus or minus 1/8 inch or better, and says a spirit level should not be used to measure slab slope.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#how-are-readings-taken","section":"guides","topic":"Foundation elevation surveys"},{"question":"Foundation elevation surveys: How are the results read?","answer":"Tilt is the whole foundation sloping one way, like a tabletop with short legs at one end; Deflection is bending, where the middle is higher or lower than a straight line between two points, giving a dome or dish shape.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#how-are-the-results-read","section":"guides","topic":"Foundation elevation surveys"},{"question":"Foundation elevation surveys: Why repeat a survey?","answer":"Time-change elevations are calculated by subtracting the older reading from the newer one at each point, using equivalent plans and the same locations. PTI notes time-change contours are typically drawn at 0.5-inch increments.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#why-repeat-a-survey","section":"guides","topic":"Foundation elevation surveys"},{"question":"What is a foundation elevation survey?","answer":"It is a set of relative floor height readings taken across a house from one reference point, then drawn as a contour map. It shows the shape of the foundation, such as which areas are high or low.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#faq-1","section":"guides","topic":"Foundation elevation surveys"},{"question":"Foundation elevation surveys: Is a new slab built perfectly level?","answer":"No. Guidelines citing the concrete tolerance standard ACI 117 treat about 1.5 inches of total out-of-levelness (plus or minus 3/4 inch) as acceptable construction, and one Texas committee found most residential slabs within about 1 inch.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#faq-2","section":"guides","topic":"Foundation elevation surveys"},{"question":"Foundation elevation surveys: What deflection and tilt numbers do engineers use?","answer":"Common guidelines use a deflection ratio of L/360 as a screening limit and a tilt of 1 percent or less across the whole length, width or diagonal. These are compared with visible distress, not used alone.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#faq-3","section":"guides","topic":"Foundation elevation surveys"},{"question":"Foundation elevation surveys: Can one survey tell if my house heaved or settled?","answer":"Usually not by itself. Without a fixed benchmark, contours show shape but not whether an area rose or fell; comparing two surveys over time is the direct way to measure movement.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#faq-4","section":"guides","topic":"Foundation elevation surveys"},{"question":"Foundation elevation surveys: Can I use a carpenter's level or marbles?","answer":"Foundation evaluation guidelines say a spirit level should not be used to measure slab slope and call for an instrument accurate to about 1/8 inch or better.","url":"https://terrabrain.vercel.app/guides/elevation-surveys#faq-5","section":"guides","topic":"Foundation elevation surveys"},{"question":"How is a foundation protected from slope creep and creek erosion?","answer":"By combining grading and drainage, erosion protection, engineered retaining walls and, in some cases, supports designed for sideways load.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization","section":"repairs"},{"question":"Slope and erosion stabilization: What problems does this address?","answer":"Slope creep is slow, downslope movement of soil. Expansive clay swells when wet and shrinks and cracks when dry, and these cycles are not fully reversible, which helps loosen and move soil on a slope over time.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#what-problems-does-this-address","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"Slope and erosion stabilization: Why does investigation come first?","answer":"A recommended practice for geotechnical work states that on sloped lots where the foundation is closer than four times the slope height to the toe of an embankment, borings should extend at least twice the slope height, and that reports should recommend earthwork stabilization and slope stability requirements.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#why-does-investigation-come-first","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"What stabilization methods are used?","answer":"Controlling water is the base of most slope work. Drainage guidelines note that:","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#what-stabilization-methods-are-used","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"Slope and erosion stabilization: What are the limitations?","answer":"Usually requires an engineer's design and may require permits; Cost is driven by wall height and length, access for equipment, the extent of bank protection and engineering and permitting needs.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#what-are-the-limitations","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"What is slope creep?","answer":"Creep is slow downhill movement of soil on a slope. In clay it is pushed along by repeated wetting and drying, and it can tilt fences, retaining walls and trees and pull at the downhill side of a foundation.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#faq-1","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"Slope and erosion stabilization: Do I need a permit for a retaining wall?","answer":"Model building codes require a permit for retaining walls over 4 feet tall, measured from the bottom of the footing to the top of the wall, and for any wall that supports a surcharge such as a building. Local rules can differ.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#faq-2","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"Slope and erosion stabilization: Can foundation piers stop a house from sliding downhill?","answer":"Standard push piers provide vertical support only. Sideways soil movement calls for a design that addresses lateral load, such as engineered walls, tiebacks or other lateral supports.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#faq-3","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"Slope and erosion stabilization: Where in Oklahoma are landslides most common?","answer":"The Oklahoma Geological Survey reports that most landslides occur in the eastern third of the state, where the climate is wetter and the terrain is steeper.","url":"https://terrabrain.vercel.app/repairs/slope-and-erosion-stabilization#faq-4","section":"repairs","topic":"Slope and erosion stabilization"},{"question":"How is a settled foundation lifted, and what happens after?","answer":"Piers raise settled areas toward original height, aiming for the best practical lift, not flat, followed by plumbing checks, a new survey and pier records.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration","section":"guides"},{"question":"What does \"lifting\" mean?","answer":"Once piers are installed under a settled section, hydraulic jacks set on the pier brackets push the foundation up. A pier is a steel or concrete column driven or drilled down to firmer soil or rock so the house no longer rests only on the shallow clay.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#what-does-lifting-mean","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Foundation lifting and restoration: Why is \"level\" not the goal?","answer":"Forensic engineers note that foundations are not constructed perfectly level, so a survey reflects as-built variation plus movement since construction.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#why-is-level-not-the-goal","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Foundation lifting and restoration: What checks follow the lift?","answer":"Expansive-soil guidance from forensic engineers recommends three steps after any lifting or lowering: 1. Plumbing tests to find leaks that the movement may have caused, especially in drain lines under the slab. 2.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#what-checks-follow-the-lift","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Foundation lifting and restoration: Which records matter later?","answer":"Each pier's depth, final pressure and final elevation are recorded on Oklahoma installation logs. These records serve several later uses:","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#which-records-matter-later","section":"guides","topic":"Foundation lifting and restoration"},{"question":"What restoration work follows?","answer":"After the structure stops moving, cosmetic work can follow: brick mortar repair (tuckpointing), drywall patching, and door and trim adjustment. Doing this work before the house has settled into its new position risks re-cracking.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#what-restoration-work-follows","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Will lifting make my house perfectly level?","answer":"No. Foundations are not built perfectly level to begin with, so an elevation survey after a lift shows original construction variation as well as any movement. The practical goal is to recover as much settlement as the structure allows without causing new damage.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#faq-1","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Should the plumbing be tested after a foundation is lifted?","answer":"Forensic engineering guidance recommends plumbing tests after any lifting or lowering to check for leaks, with any leaks repaired, followed by a new baseline elevation survey.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#faq-2","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Foundation lifting and restoration: How hard is each steel pier pushed during installation?","answer":"Oklahoma installation records show steel push piers driven to at least 6,000 psi of hydraulic pressure, with a median near 9,000 psi on a large Tulsa job, and each pier's depth and pressure logged.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#faq-3","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Do I have to disclose a foundation repair when I sell?","answer":"Yes, if you know about it. The Oklahoma disclosure form asks sellers directly whether they are aware of any previous foundation repairs and whether any warranties, including foundation warranties, cover the property.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#faq-4","section":"guides","topic":"Foundation lifting and restoration"},{"question":"Foundation lifting and restoration: Who can sign an engineering completion letter in Oklahoma?","answer":"Only a licensed professional engineer. Oklahoma's engineering board says a repair company may send its own completion letter but may not call it an engineering completion letter.","url":"https://terrabrain.vercel.app/guides/lifting-procedure-and-restoration#faq-5","section":"guides","topic":"Foundation lifting and restoration"},{"question":"How is foundation movement monitored in Oklahoma?","answer":"Repeat elevation surveys, crack gauges and soil-moisture records taken over at least a year show whether a foundation is still moving or has stabilized.","url":"https://terrabrain.vercel.app/repairs/monitoring-program","section":"repairs"},{"question":"What is a monitoring program?","answer":"Monitoring is observation, not a repair. It combines three kinds of records taken on a schedule:","url":"https://terrabrain.vercel.app/repairs/monitoring-program#what-is-a-monitoring-program","section":"repairs","topic":"Foundation monitoring"},{"question":"Why does monitoring matter on Oklahoma clay?","answer":"Expansive clay swells when wet and shrinks when dry. The depth where this seasonal moisture change happens is called the active zone.","url":"https://terrabrain.vercel.app/repairs/monitoring-program#why-does-monitoring-matter-on-oklahoma-clay","section":"repairs","topic":"Foundation monitoring"},{"question":"Foundation monitoring: How are the measurements taken?","answer":"Readings are taken about every 30 to 100 square feet, including room corners and near heavy loads such as masonry fireplaces; The instrument should read to about 1/8 inch or better; a spirit or carpenter's level is not considered accurate enough; Each survey uses the same points and the same reference point so that a \"time-change\" plan (later reading minus earlier reading) can be drawn.","url":"https://terrabrain.vercel.app/repairs/monitoring-program#how-are-the-measurements-taken","section":"repairs","topic":"Foundation monitoring"},{"question":"Foundation monitoring: How often are readings taken and when is movement stable?","answer":"Guidelines from a Texas engineering group working on similar expansive clays set out these points:","url":"https://terrabrain.vercel.app/repairs/monitoring-program#how-often-are-readings-taken-and-when-is-movement-stable","section":"repairs","topic":"Foundation monitoring"},{"question":"What are the limitations of monitoring?","answer":"Monitoring takes at least a year and only shows whether movement has stopped; it does not stop movement itself; Results depend on repeating the same points, the same reference and comparable instruments; Newly built foundations commonly go through a 12- to 24-month adjustment period, which can look like movement.","url":"https://terrabrain.vercel.app/repairs/monitoring-program#what-are-the-limitations-of-monitoring","section":"repairs","topic":"Foundation monitoring"},{"question":"How long should a foundation be monitored before deciding on repair?","answer":"Engineering guidelines call for at least one year of monitoring, with at least three elevation surveys and the first and last taken in the same season, so seasonal swings can be separated from ongoing movement.","url":"https://terrabrain.vercel.app/repairs/monitoring-program#faq-1","section":"repairs","topic":"Foundation monitoring"},{"question":"Foundation monitoring: Can I use a carpenter's level to check my floors over time?","answer":"No. Published guidelines say a spirit or carpenter's level is not accurate enough for an elevation survey; a manometer-style or other floor-level instrument reading to about 1/8 inch is used instead.","url":"https://terrabrain.vercel.app/repairs/monitoring-program#faq-2","section":"repairs","topic":"Foundation monitoring"},{"question":"Foundation monitoring: What does it mean if a crack closes in spring and opens again in summer?","answer":"A crack that opens and closes with the seasons is moving with soil moisture. It indicates cyclical movement, which is typical of expansive clay, not that the problem fixed itself.","url":"https://terrabrain.vercel.app/repairs/monitoring-program#faq-3","section":"repairs","topic":"Foundation monitoring"},{"question":"Foundation monitoring: How can I check soil moisture conditions where I live in Oklahoma?","answer":"The Oklahoma Mesonet publishes daily soil moisture readings at depths from 2 to 24 inches at most of its stations, including the Fractional Water Index on a 0-to-1 scale.","url":"https://terrabrain.vercel.app/repairs/monitoring-program#faq-4","section":"repairs","topic":"Foundation monitoring"},{"question":"Is a concrete crack from shrinkage or foundation movement?","answer":"Many cracks come from materials shrinking or moving with temperature, not the foundation; a floor elevation survey and crack pattern tell them apart.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic","section":"causes"},{"question":"Shrinkage vs. foundation cracks: Why do materials crack on their own?","answer":"Concrete changes volume as its moisture and temperature change. As freshly placed concrete dries, it shrinks; as the seasons change, it expands and contracts. When that movement is restrained, for example by a footing, a wall or the ground, the concrete cracks.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#why-do-materials-crack-on-their-own","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"Shrinkage vs. foundation cracks: How is concrete detailed to control cracking?","answer":"Concrete slabs are given contraction joints, grooves that create a planned weak line so the slab cracks there instead of randomly.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#how-is-concrete-detailed-to-control-cracking","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"Shrinkage vs. foundation cracks: When is a crack more than cosmetic?","answer":"The concrete industry states that cracking is not necessarily a sign of poor materials, poor workmanship or a structural problem.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#when-is-a-crack-more-than-cosmetic","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"What are the signs of shrinkage or thermal cracking?","answer":"visible slab cracks, especially fine random cracks in a newer slab; nail pops and tape-joint cracks in drywall; vertical brick or veneer cracks without offset.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#what-are-the-signs-of-shrinkage-or-thermal-cracking","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"How are shrinkage cracks typically addressed?","answer":"Where the foundation is sound, the cracks are treated as finish repairs. Texas guidelines note that an owner may choose periodic cosmetic repairs and door adjustments rather than structural work. See cosmetic repair only.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#how-are-shrinkage-cracks-typically-addressed","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"Are hairline cracks in a new slab a foundation problem?","answer":"Not necessarily. Concrete changes volume as it dries and as temperature changes, and random early-age cracks rarely affect structural integrity or service life. Industry guidance states that cracking is not necessarily a sign of poor materials, workmanship or a structural problem.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#faq-1","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"Shrinkage vs. foundation cracks: What is crazing on concrete?","answer":"Crazing is a pattern of fine, shallow surface cracks, usually no deeper than about 1/8 inch, that form roughly hexagonal shapes. It typically appears within the first days after placement and does not affect structural integrity.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#faq-2","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"Shrinkage vs. foundation cracks: When does a basement wall crack need repair?","answer":"Typical warranties call for repair when a crack leaks, shows measurable vertical displacement or is wider than 1/8 inch. Cracks that keep widening over time call for professional evaluation.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#faq-3","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"How can I tell a shrinkage crack from a movement crack?","answer":"Shrinkage cracks tend to be fine, appear early in a building's life and do not come with changes in floor level. A floor elevation survey, especially compared with a baseline, shows whether the foundation has actually moved.","url":"https://terrabrain.vercel.app/causes/material-shrinkage-and-thermal-cracking-mimic#faq-4","section":"causes","topic":"Shrinkage vs. foundation cracks"},{"question":"Is a vertical crack in brick veneer a foundation problem?","answer":"A vertical crack near a corner, offset or long wall is often brick expansion. Tapered cracks, or ones at an addition, more likely involve the foundation.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack","section":"signs"},{"question":"What does a vertical brick crack look like?","answer":"The crack runs straight up and down, through brick units or along the vertical (head) joints, with roughly the same width from top to bottom. It is common near outside corners, at offsets in the wall, and partway along long uninterrupted walls.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#what-does-a-vertical-brick-crack-look-like","section":"signs","topic":"Vertical brick crack"},{"question":"Why does brick crack vertically?","answer":"Fired clay brick absorbs moisture from the air and expands permanently; most of that growth happens in the first weeks after firing, with a slower rate for years. Brick is the only common building material listed with this kind of irreversible moisture expansion.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#why-does-brick-crack-vertically","section":"signs","topic":"Vertical brick crack"},{"question":"When does a vertical crack point to the foundation?","answer":"Settlement and deflection cracks have a tapering shape. Nearly vertical settlement cracks are described at the joints of bay windows, porches and additions; see differential movement at additions. For tapered patterns, see stair-step crack wider at top.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#when-does-a-vertical-crack-point-to-the-foundation","section":"signs","topic":"Vertical brick crack"},{"question":"How is a vertical crack documented?","answer":"Width along the length. Measure at the top, middle and bottom. Even width supports expansion; taper supports movement; Activity. A clean crack suggests recent movement, while a dirty or previously filled crack may be inactive; Location.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#how-is-a-vertical-crack-documented","section":"signs","topic":"Vertical brick crack"},{"question":"Is a vertical crack in my brick a foundation problem?","answer":"Often it is not. Clay brick expands permanently with moisture and moves with temperature, and long walls without enough expansion joints can crack. Vertical cracking at corners can also come from thermal movement, while settlement cracks usually taper.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#faq-1","section":"signs","topic":"Vertical brick crack"},{"question":"How much does a brick wall grow?","answer":"Brick industry guidance estimates total unrestrained movement for brick veneer at about 0.0009 times the wall length, combining permanent moisture expansion and temperature movement. That is roughly a quarter inch over 25 feet.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#faq-2","section":"signs","topic":"Vertical brick crack"},{"question":"Where should brick expansion joints be?","answer":"Brick industry guidance places vertical expansion joints near corners, preferably within about 2 feet, and at offsets, with spacing of no more than 25 feet on walls without openings and about 20 feet on walls with several openings.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#faq-3","section":"signs","topic":"Vertical brick crack"},{"question":"What makes a vertical crack look like settlement instead?","answer":"Settlement and deflection cracks taper, wide at one end and hairline at the other. A vertical crack that is clearly wider at the top or bottom, or that sits where an addition or porch meets the house, points more toward foundation movement.","url":"https://terrabrain.vercel.app/signs/vertical-brick-or-veneer-crack#faq-4","section":"signs","topic":"Vertical brick crack"},{"question":"Is it earthquake damage or soil movement in my Oklahoma home?","answer":"Earthquake damage appears at a set moment tied to a recorded event; expansive clay damage builds over months or years and changes with the seasons.","url":"https://terrabrain.vercel.app/guides/seismic-damage-vs-soil-movement","section":"guides"},{"question":"Earthquake vs soil damage: Why does this question come up in Oklahoma?","answer":"Oklahoma has had far more earthquakes since 2009 than before, and much of the state has expansive clay soil that moves with moisture. Both can crack drywall, brick and slabs, so homeowners and insurers often need to know which one did it.","url":"https://terrabrain.vercel.app/guides/seismic-damage-vs-soil-movement#why-does-this-question-come-up-in-oklahoma","section":"guides","topic":"Earthquake vs soil damage"},{"question":"Earthquake vs soil damage: What are the typical documentation steps?","answer":"Pull the earthquake record. The OGS catalog lists date, location and magnitude for Oklahoma events; Did You Feel It? maps reported shaking; Establish when damage was first seen.","url":"https://terrabrain.vercel.app/guides/seismic-damage-vs-soil-movement#what-are-the-typical-documentation-steps","section":"guides","topic":"Earthquake vs soil damage"},{"question":"Can a small earthquake crack my foundation?","answer":"Damage generally starts around intensity VI on the Modified Mercalli scale, described as minor damage such as some falling plaster and a few cracks.","url":"https://terrabrain.vercel.app/guides/seismic-damage-vs-soil-movement#faq-1","section":"guides","topic":"Earthquake vs soil damage"},{"question":"Earthquake vs soil damage: How do I know how hard the ground shook at my house?","answer":"The USGS Did You Feel It? system maps shaking reported by people for each earthquake, and the Oklahoma Geological Survey publishes catalogs with the date, location and magnitude of Oklahoma events.","url":"https://terrabrain.vercel.app/guides/seismic-damage-vs-soil-movement#faq-2","section":"guides","topic":"Earthquake vs soil damage"},{"question":"What does foundation damage from clay soil look like?","answer":"Soil-related damage usually builds over time: cracks in walls and foundations, then sticking doors and sloping floors. It follows the shape the slab has been bent into, such as edges dropping or the center rising.","url":"https://terrabrain.vercel.app/guides/seismic-damage-vs-soil-movement#faq-3","section":"guides","topic":"Earthquake vs soil damage"},{"question":"Do earthquake hazard estimates account for damage from many small quakes?","answer":"Not fully. The Oklahoma Geological Survey noted that the 2016 USGS hazard model for Oklahoma did not address cumulative damage from multiple small-to-moderate earthquakes over time.","url":"https://terrabrain.vercel.app/guides/seismic-damage-vs-soil-movement#faq-4","section":"guides","topic":"Earthquake vs soil damage"},{"question":"Should I remove a tree near my foundation in Oklahoma?","answer":"Trees dry clay under foundations and can cause settling, but removing a large tree on expansive clay can let soil rewet and swell for years afterward.","url":"https://terrabrain.vercel.app/repairs/tree-management","section":"repairs"},{"question":"How do trees affect clay under a house?","answer":"Trees draw water from the soil to replace water lost through their leaves. In clay, that drying makes the soil shrink, and if the shrinkage reaches beneath a foundation, the foundation can subside.","url":"https://terrabrain.vercel.app/repairs/tree-management#how-do-trees-affect-clay-under-a-house","section":"repairs","topic":"Trees near the foundation"},{"question":"Trees near the foundation: How close is too close?","answer":"Published rules of thumb differ:","url":"https://terrabrain.vercel.app/repairs/tree-management#how-close-is-too-close","section":"repairs","topic":"Trees near the foundation"},{"question":"Trees near the foundation: Which tree species use the most water?","answer":"UK building guidance lists oak, poplar and eucalyptus among high-water-demand trees and notes that hardwoods have broad, spreading roots while conifers have a more local effect.","url":"https://terrabrain.vercel.app/repairs/tree-management#which-tree-species-use-the-most-water","section":"repairs","topic":"Trees near the foundation"},{"question":"Trees near the foundation: What are the tree management options?","answer":"Reducing a tree's crown cuts its leaf area and so its water use. A foundation maintenance guide recommends a pruning program where a tree is too close, with a reasonable interval of every two to three years.","url":"https://terrabrain.vercel.app/repairs/tree-management#what-are-the-tree-management-options","section":"repairs","topic":"Trees near the foundation"},{"question":"Trees near the foundation: What are the limits of tree management?","answer":"Removal on clay can cause years of heave; Pruning must be repeated as the tree regrows; These steps do not raise a foundation that has already settled.","url":"https://terrabrain.vercel.app/repairs/tree-management#what-are-the-limits-of-tree-management","section":"repairs","topic":"Trees near the foundation"},{"question":"How close is too close for a tree near my house?","answer":"One engineering maintenance guide says broadleaf trees should not be closer to the foundation than their height. OSU Extension advises planting at least half the tree's mature width from a building, noting roots can extend two to three times beyond the canopy width.","url":"https://terrabrain.vercel.app/repairs/tree-management#faq-1","section":"repairs","topic":"Trees near the foundation"},{"question":"Will cutting down a tree near my foundation fix settlement?","answer":"Not necessarily. When a large tree is removed from clay soil, the ground slowly rewets and can swell, lifting the foundation; guidance notes this heave tends to occur during the first few years and its duration is hard to predict.","url":"https://terrabrain.vercel.app/repairs/tree-management#faq-2","section":"repairs","topic":"Trees near the foundation"},{"question":"How often should a tree near the house be pruned to reduce its water use?","answer":"A foundation maintenance guide suggests a pruning program for trees that are too close, with a reasonable interval of every two to three years.","url":"https://terrabrain.vercel.app/repairs/tree-management#faq-3","section":"repairs","topic":"Trees near the foundation"},{"question":"Do some trees cause more foundation problems than others?","answer":"Building guidance commonly lists oak and poplar as high water demand, and larger trees with more leaf area generally take up more water. Researchers have also argued rooting habit matters as much as species water use.","url":"https://terrabrain.vercel.app/repairs/tree-management#faq-4","section":"repairs","topic":"Trees near the foundation"},{"question":"What affects the cost of foundation repair in Oklahoma?","answer":"Scope drives cost: the cause of movement, foundation type, number and depth of supports, access, drainage and plumbing work, engineering, permits and follow-up.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost","section":"guides"},{"question":"What sets the scope of a foundation repair?","answer":"Repair options for foundations on expansive clay fall into two groups: - Non-structural: watering programs, vegetation changes, root barriers, gutters and downspouts, grading, subsurface drains and moisture barriers. - Structural: underpinning (adding supports under the foundation), grouting, mudjacking, crack injection and, for post-tensioned slabs, re-stressing tendons.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#what-sets-the-scope-of-a-foundation-repair","section":"guides","topic":"Foundation repair cost factors"},{"question":"Foundation repair cost factors: Why does the cause of movement matter?","answer":"Settlement or heave. Settlement is the foundation sinking; heave is clay swelling and pushing it up. Piers stop settlement where they are placed, but those areas can still heave, and a slab supported only in part can both heave and settle.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#why-does-the-cause-of-movement-matter","section":"guides","topic":"Foundation repair cost factors"},{"question":"How do foundation type and support points change the work?","answer":"Slab on grade: structural options include underpinning, grouting, mudjacking and crack injection; Pier and beam: repair can involve shimming the floor, framing repairs, added supports and crawl space moisture control; Interior support points: in Oklahoma installation records, piers pushed at the interior slab stopped at about 8 to 11 feet and 4,000 to 5,000 psi, while piers at the perimeter footing reached about 13 to 17 feet and 7,000 to 8,000 psi.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#how-do-foundation-type-and-support-points-change-the-work","section":"guides","topic":"Foundation repair cost factors"},{"question":"Foundation repair cost factors: Why does depth to bearing soil or rock matter?","answer":"A bearing stratum is a layer of soil or rock firm enough to carry the load.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#why-does-depth-to-bearing-soil-or-rock-matter","section":"guides","topic":"Foundation repair cost factors"},{"question":"Foundation repair cost factors: What other work can be part of the job?","answer":"Engineering. Under Oklahoma's engineering board guidelines, a professional engineer visits the site or directs a technician, then issues a signed, sealed and dated repair plan or a sealed statement that no pier repair is needed; the repair company carries out that plan.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#what-other-work-can-be-part-of-the-job","section":"guides","topic":"Foundation repair cost factors"},{"question":"Foundation repair cost factors: How do warranty terms and insurance fit in?","answer":"Warranty. Foundation performance after repair is judged against the standard written into the contract or warranty.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#how-do-warranty-terms-and-insurance-fit-in","section":"guides","topic":"Foundation repair cost factors"},{"question":"Why do repair proposals for the same house differ so much?","answer":"Proposals can assume different causes of movement, different numbers and depths of support points, and different extras such as drainage work, plumbing tests, engineering, permits, restoration and monitoring. Listing what each proposal includes shows where they differ.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#faq-1","section":"guides","topic":"Foundation repair cost factors"},{"question":"Foundation repair cost factors: Why is pier depth not known before the work starts?","answer":"Steel push piers are pressed until they meet resistance and helical piers are turned to a set torque, so the final depth is found during installation. In one set of Tulsa installation records, 396 piers stopped at a median of 12 feet, with a range of 2 to 40 feet on the same site.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#faq-2","section":"guides","topic":"Foundation repair cost factors"},{"question":"Does homeowners insurance pay for foundation repair?","answer":"Usually not when soil movement is the cause. The standard homeowners form excludes earth movement regardless of its cause, and an insurance coverage analysis applied that exclusion to a foundation cracked during drought. The policy's own wording controls.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#faq-3","section":"guides","topic":"Foundation repair cost factors"},{"question":"Foundation repair cost factors: Does an engineer have to be involved?","answer":"Oklahoma's engineering board guidelines say that when a professional engineer is involved, the repair plan must be signed, sealed and dated and the repair company carries out that plan. Cities such as Tulsa can also require construction plans for structural repair permits.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#faq-4","section":"guides","topic":"Foundation repair cost factors"},{"question":"Why might repairs wait while the house is monitored?","answer":"Monitoring guidelines call for at least three elevation surveys over at least one year to tell seasonal movement from ongoing movement. Repairs to cracks and finishes made after movement has stopped are less likely to reappear.","url":"https://terrabrain.vercel.app/guides/what-affects-foundation-repair-cost#faq-5","section":"guides","topic":"Foundation repair cost factors"},{"question":"What are loess and collapsible soils in western Oklahoma?","answer":"Loess is wind-deposited silt, found mainly on Oklahoma Panhandle tablelands. Loose, dry wind-laid soils can collapse when wetted, the reverse of swelling clay.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils","section":"guides"},{"question":"What are loess and eolian soils?","answer":"Loess is silt that wind picked up and dropped in sheets across the landscape. Eolian simply means wind-deposited, and covers sandy deposits as well as silt.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#what-are-loess-and-eolian-soils","section":"guides","topic":"Loess and collapsible soils"},{"question":"Loess and collapsible soils: How does collapse differ from swell?","answer":"A collapsible soil is a loose, low-density soil that holds its shape while dry but loses volume when water soaks in under the weight of a building. The result is settlement, often sudden and concentrated where water entered. The mechanism is described on the hydrocollapse page.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#how-does-collapse-differ-from-swell","section":"guides","topic":"Loess and collapsible soils"},{"question":"Loess and collapsible soils: Which water sources matter?","answer":"Because wetting triggers collapse, the source of water matters: plumbing leaks, roof runoff, irrigation and poor grading. A simple supply-leak check is to read the water meter, use no water for two hours, and read it again; any change probably means a leak.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#which-water-sources-matter","section":"guides","topic":"Loess and collapsible soils"},{"question":"How are collapsible soils repaired?","answer":"Repair options on collapsible ground are compared on the method selection matrix. They include piers taken through the loose layer to firmer support, such as steel push piers or helical piers, void and compaction grouting in some cases, and drainage control.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#how-are-collapsible-soils-repaired","section":"guides","topic":"Loess and collapsible soils"},{"question":"What is loess?","answer":"Loess is silt that was carried and deposited by wind. In Oklahoma, the Richfield soil of the Panhandle tablelands formed in calcareous loess 3 to more than 10 feet thick.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#faq-1","section":"guides","topic":"Loess and collapsible soils"},{"question":"Where are loess soils found in Oklahoma?","answer":"Mainly in the Oklahoma Panhandle. The Richfield series, formed in loess, is mapped there, and wind-deposited sandy soils such as the Dalhart series have their type location in Cimarron County.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#faq-2","section":"guides","topic":"Loess and collapsible soils"},{"question":"What is a collapsible soil?","answer":"It is a loose, dry soil that holds its shape while dry but can lose volume when it is wetted under a load, causing sudden settlement. It is the opposite reaction to water from expansive clay, which swells.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#faq-3","section":"guides","topic":"Loess and collapsible soils"},{"question":"Loess and collapsible soils: Is the Ulysses soil mapped in Oklahoma?","answer":"No longer. The official USDA description for the Ulysses series, a loess soil, notes that Oklahoma was removed from its range in 2016.","url":"https://terrabrain.vercel.app/guides/collapsible-and-loess-soils#faq-4","section":"guides","topic":"Loess and collapsible soils"},{"question":"What are Oklahoma's pier and anchor rules for manufactured homes?","answer":"New homes follow the federal standard or maker's instructions. Used homes need block footings, piers no more than 6 feet apart, limited shims and anchor ties.","url":"https://terrabrain.vercel.app/data/manufactured-homes","section":"data"},{"question":"Who sets the installation rules?","answer":"Manufactured home installation in Oklahoma falls under Title 765, Chapter 37 of the Oklahoma Administrative Code, administered by the Oklahoma Used Motor Vehicle, Dismantler, and Manufactured Housing Commission.","url":"https://terrabrain.vercel.app/data/manufactured-homes#who-sets-the-installation-rules","section":"data","topic":"Manufactured home pier rules"},{"question":"What are the support rules for used homes (OAC 765:37-7-3)?","answer":"A footing is the pad that spreads a pier's load onto the soil.","url":"https://terrabrain.vercel.app/data/manufactured-homes#what-are-the-support-rules-for-used-homes-oac-765-37-7-3","section":"data","topic":"Manufactured home pier rules"},{"question":"What are the anchoring rules for used homes (OAC 765:37-7-4)?","answer":"Anchors and ties hold the home down and resist sideways movement in wind.","url":"https://terrabrain.vercel.app/data/manufactured-homes#what-are-the-anchoring-rules-for-used-homes-oac-765-37-7-4","section":"data","topic":"Manufactured home pier rules"},{"question":"Why do surface piers move on Oklahoma clay?","answer":"The rules above place block footings on firm undisturbed soil or compacted fill after organic material is removed. Where that soil is expansive clay, it swells when wet and shrinks when dry.","url":"https://terrabrain.vercel.app/data/manufactured-homes#why-do-surface-piers-move-on-oklahoma-clay","section":"data","topic":"Manufactured home pier rules"},{"question":"Who regulates manufactured home installation in Oklahoma?","answer":"The Oklahoma Used Motor Vehicle, Dismantler, and Manufactured Housing Commission licenses installers. Installing a home with an unlicensed installer is listed as an unacceptable procedure under Oklahoma Administrative Code 765:37.","url":"https://terrabrain.vercel.app/data/manufactured-homes#faq-1","section":"data","topic":"Manufactured home pier rules"},{"question":"How far apart can piers be under a used manufactured home in Oklahoma?","answer":"Piers under each main frame beam can be no more than 6 feet on center, and the end piers must be within 2 feet of the frame ends.","url":"https://terrabrain.vercel.app/data/manufactured-homes#faq-2","section":"data","topic":"Manufactured home pier rules"},{"question":"What soil strength does Oklahoma assume for manufactured home footings?","answer":"The rule assumes at least 1,500 pounds per square foot unless site conditions call for a lower value, in which case an engineer, architect or geologist should be consulted. Soil testing can change the assumed value.","url":"https://terrabrain.vercel.app/data/manufactured-homes#faq-3","section":"data","topic":"Manufactured home pier rules"},{"question":"How much shimming is allowed under a manufactured home?","answer":"Shims must be nominal 4x6x1 pieces used in pairs and driven tight, taking up no more than one inch of height.","url":"https://terrabrain.vercel.app/data/manufactured-homes#faq-4","section":"data","topic":"Manufactured home pier rules"},{"question":"How many anchor ties does a used manufactured home need?","answer":"Diagonal ties may be no more than 11 feet apart along each side, with the end ties within 2 feet of each end. Each anchor must resist 4,725 pounds total with a working capacity of 3,150 pounds.","url":"https://terrabrain.vercel.app/data/manufactured-homes#faq-5","section":"data","topic":"Manufactured home pier rules"},{"question":"What are stem wall and grade beam foundations?","answer":"A stem wall is a short wall on a continuous footing. A grade beam spans drilled piers set below swelling clay, with a gap under it so clay cannot lift it.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam","section":"foundations"},{"question":"What is a stem wall on a footing?","answer":"A footing is the wide concrete base that spreads the house's weight onto the soil. A stem wall is the vertical wall of concrete or masonry that rises from it.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#what-is-a-stem-wall-on-a-footing","section":"foundations","topic":"Stem wall and grade beam"},{"question":"What is a grade beam on drilled piers?","answer":"A drilled pier is a concrete column cast in an augered hole. A grade beam is a reinforced concrete beam that spans from pier to pier at the ground surface and carries the walls.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#what-is-a-grade-beam-on-drilled-piers","section":"foundations","topic":"Stem wall and grade beam"},{"question":"Stem wall and grade beam: How do these foundations fail?","answer":"When piers move after construction or repair, the mechanism is covered in pier uplift or movement after repair. Underpinning brackets bear on the stem wall or grade beam itself; spacing and load questions are covered in loads, pier spacing and capacity.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#how-do-these-foundations-fail","section":"foundations","topic":"Stem wall and grade beam"},{"question":"Stem wall and grade beam: How are these foundations repaired?","answer":"Deeper or belled supports: drilled bell-bottom piers; Steel underpinning on the stem wall: steel push piers or helical piers; Moisture control around the perimeter: drainage and root barriers.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#how-are-these-foundations-repaired","section":"foundations","topic":"Stem wall and grade beam"},{"question":"What is a stem wall foundation?","answer":"A stem wall is a short concrete or masonry wall built on a continuous footing. It raises the house above grade and either carries a wood floor over a crawl space or surrounds a slab poured inside it.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#faq-1","section":"foundations","topic":"Stem wall and grade beam"},{"question":"What is a grade beam on drilled piers?","answer":"It is a reinforced concrete beam that spans between drilled concrete piers. The piers carry the load down below the zone of seasonal soil moisture change, and on swelling soils a gap is left under the beam so the clay cannot push it up.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#faq-2","section":"foundations","topic":"Stem wall and grade beam"},{"question":"Why would a grade beam foundation heave?","answer":"Common causes named in engineering guidance include a missing or inadequate void space under the beam, piers that are too short or the wrong diameter, and mushroom-topped piers.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#faq-3","section":"foundations","topic":"Stem wall and grade beam"},{"question":"Stem wall and grade beam: What reinforcement does Oklahoma require in footings?","answer":"Oklahoma's adoption of the 2024 International Residential Code adds two No. 4 bars to all footings and requires cold joints between footings and stem walls to be tied with No. 4 bars at each corner and no more than 6 feet apart.","url":"https://terrabrain.vercel.app/foundations/stem-wall-and-grade-beam#faq-4","section":"foundations","topic":"Stem wall and grade beam"},{"question":"What bedrock is under Oklahoma City homes?","answer":"Mainly Permian red-bed Hennessey shale and Garber sandstone; the clay soils formed from these rocks, not the rock itself, cause most shrink-swell movement.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro","section":"guides"},{"question":"Bedrock under OKC: What are the main rock units?","answer":"The Hennessey is about 90 meters (roughly 300 feet) thick in the USGS study area, and its near-surface layers in western Oklahoma County dip gently west-southwest toward the Anadarko Basin.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#what-are-the-main-rock-units","section":"guides","topic":"Bedrock under OKC"},{"question":"Bedrock under OKC: How deep is rock?","answer":"On Hennessey shale (I-35/I-240): soil of lean clay, silt and sand extended about 2 to 16 feet, and bedrock was reached at 16, 5.5, 2, 2 and 2 feet in five borings. The report notes that shale weathering is erratic and can change over short distances.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#how-deep-is-rock","section":"guides","topic":"Bedrock under OKC"},{"question":"Bedrock under OKC: Where do groundwater and perched water occur?","answer":"At the Hennessey site, most borings were dry, but lab tests showed high saturation in some soil as shallow as 3 feet, and the report warns of perched water in the soil or at the soil-rock contact that changes with the seasons.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#where-do-groundwater-and-perched-water-occur","section":"guides","topic":"Bedrock under OKC"},{"question":"Bedrock under OKC: How does the rock differ from the soil on top?","answer":"The Hennessey shale in a USGS core taken below the soil was mostly illite and kaolinite, clay minerals with low shrink-swell potential. The soils that form on Permian shales tell a different story.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#how-does-the-rock-differ-from-the-soil-on-top","section":"guides","topic":"Bedrock under OKC"},{"question":"Bedrock under OKC: What does it mean for foundations?","answer":"Shallow Hennessey rock usually means shorter piers, but rock depth can change sharply between neighboring borings; On thick soil over Garber sandstone, competent rock at the boring site (20.5 to 95 feet) lay well below the 8 to 16 foot depths typical of Oklahoma push pier installation records, so piers there may stop in dense soil rather than on rock; At the I-35/I-240 site, alluvium lies over the Hennessey shale.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#what-does-it-mean-for-foundations","section":"guides","topic":"Bedrock under OKC"},{"question":"What rock is under Oklahoma City?","answer":"Mostly Permian red beds. The Hennessey Group, a red-brown shale with siltstone and some sandstone, underlies large parts of the metro, and the Garber Sandstone, a red cross-bedded sandstone with red shales, underlies other areas including north Edmond borings.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#faq-1","section":"guides","topic":"Bedrock under OKC"},{"question":"How deep is bedrock in Oklahoma City?","answer":"It varies widely. Highway borings on Hennessey shale near I-35 and I-240 found rock between about 2 and 16 feet, while borings on Garber sandstone near I-35 and Waterloo Road found overburden 20 to more than 90 feet thick.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#faq-2","section":"guides","topic":"Bedrock under OKC"},{"question":"Bedrock under OKC: Is the Hennessey shale itself expansive?","answer":"A USGS study found the Hennessey shale cored below the soil at a northwest Oklahoma City site was mostly illite and kaolinite with low shrink-swell potential; the swelling problems are mainly in the clay soils that form from these rocks.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#faq-3","section":"guides","topic":"Bedrock under OKC"},{"question":"Bedrock under OKC: Why does depth to rock matter for my house?","answer":"Driven and drilled piers get much of their support from firm soil or rock, so shallow rock usually means shorter piers, while thick soil over deep rock means piers may stop on friction in dense soil instead.","url":"https://terrabrain.vercel.app/guides/bedrock-okc-metro#faq-4","section":"guides","topic":"Bedrock under OKC"},{"question":"What bedrock is under Tulsa, Oklahoma homes and how deep is it?","answer":"Mostly Pennsylvanian shale with sandstone and limestone; upland borings usually hit rock within 4 to 20 feet, river banks have 18 to 35 feet of sediment.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro","section":"guides"},{"question":"What rock layers are under Tulsa?","answer":"Engineering reports across the metro describe the same basic pattern: clay soil over shale, with sandstone and limestone layers mixed in.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#what-rock-layers-are-under-tulsa","section":"guides","topic":"Tulsa bedrock depth"},{"question":"Tulsa bedrock depth: How deep is rock in public borings?","answer":"At I-44/US-75, one boring hit a well-cemented sandstone layer near the surface with a significant thickness of sandy lean clay beneath it, and the report said it should not be considered competent rock. A hard layer near the surface is not always the bottom.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#how-deep-is-rock-in-public-borings","section":"guides","topic":"Tulsa bedrock depth"},{"question":"What is under Tulsa's river corridors?","answer":"Alluvium is sediment laid down by rivers. Along the Arkansas River it is mostly poorly graded sand to silty sand with infrequent clay seams and low gravel content, very loose to loose, with clay layers that are very soft to soft.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#what-is-under-tulsa-s-river-corridors","section":"guides","topic":"Tulsa bedrock depth"},{"question":"Tulsa bedrock depth: What clay sits on top of the rock?","answer":"The soil over Tulsa shale can be highly plastic. Lab tests on the 91st Street walls found fat clay with plasticity indices up to about 39, and east Tulsa samples ranged from 23 to 34.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#what-clay-sits-on-top-of-the-rock","section":"guides","topic":"Tulsa bedrock depth"},{"question":"Tulsa bedrock depth: How does water behave on the shale?","answer":"Five of nine east Tulsa borings recorded water at some point, at depths from 3.5 to 18.5 feet, with end-of-drilling readings of 7 to 9.5 feet; the others were dry. The 91st Street report found water at 13.5 to 15 feet along one wall and dry borings along the other.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#how-does-water-behave-on-the-shale","section":"guides","topic":"Tulsa bedrock depth"},{"question":"How deep do Tulsa piers go?","answer":"On one large Tulsa site, 396 logged steel push piers refused at a median of 12 feet, with the middle half between 9 and 14 feet and a range of 2 to 40 feet, at a median pressure of about 9,000 psi.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#how-deep-do-tulsa-piers-go","section":"guides","topic":"Tulsa bedrock depth"},{"question":"What kind of rock is under Tulsa?","answer":"Mostly gray shale of Pennsylvanian age, with sandstone and thin limestone layers. Engineering reports in the metro name units such as the Nowata, Holdenville, Nellie Bly, Wewoka and Senora.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#faq-1","section":"guides","topic":"Tulsa bedrock depth"},{"question":"How deep is rock in Tulsa?","answer":"Public borings on upland shale commonly reached weathered or competent rock between about 4 and 20 feet, while borings on Arkansas River banks found 18 to 35 feet of river sand and clay over the shale.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#faq-2","section":"guides","topic":"Tulsa bedrock depth"},{"question":"How deep do foundation piers go in Tulsa?","answer":"On one large Tulsa site with nearly 400 logged steel push piers, the median refusal depth was 12 feet, with half of piers between 9 and 14 feet and a full range of 2 to 40 feet.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#faq-3","section":"guides","topic":"Tulsa bedrock depth"},{"question":"Why do Tulsa crawl spaces and yards stay wet after rain?","answer":"Water often sits on top of tight shale or clay layers as perched water; Tulsa borings that found water commonly found it at shallow depths above or near the rock.","url":"https://terrabrain.vercel.app/guides/bedrock-tulsa-metro#faq-4","section":"guides","topic":"Tulsa bedrock depth"},{"question":"What causes a hump in the middle of a slab floor?","answer":"Usually heave: soil under the area swells and pushes the slab up, from slow moisture build-up, a plumbing leak or removal of a large tree on expansive clay.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump","section":"signs"},{"question":"What does a floor hump look like?","answer":"The floor rises toward a point or area away from the outside walls, so the perimeter sits lower than the middle. Interior doors may rub at the top, and tile or wood flooring over the high spot may crack. This sign applies to slab-on-grade and post-tensioned houses.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#what-does-a-floor-hump-look-like","section":"signs","topic":"Interior floor hump"},{"question":"Why do slab floors hump?","answer":"Expansive clay swells when it gains water and shrinks when it loses it, and most of Oklahoma has these soils. Soil only moves when its moisture changes unevenly across the site, and leaking pipes, poor drainage, irrigation and trees are listed contributors.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#why-do-slab-floors-hump","section":"signs","topic":"Interior floor hump"},{"question":"Interior floor hump: How is it documented?","answer":"Elevation survey. A relative floor elevation survey, drawn as a map, is the step engineering guidance uses beyond a visual first impression. A hump shows as a high zone with lower readings toward the perimeter. See elevation surveys; Short-distance caution.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#how-is-it-documented","section":"signs","topic":"Interior floor hump"},{"question":"Interior floor hump: Why does the cause matter for repair?","answer":"Repair guidance for expansive soils puts correcting the moisture source, such as plumbing leaks and drainage, ahead of leveling, and notes that leveling measures mainly mitigate distress.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#why-does-the-cause-matter-for-repair","section":"signs","topic":"Interior floor hump"},{"question":"Why is there a hump in the middle of my floor?","answer":"On expansive clay, a raised interior area usually means the soil under that part of the slab has gained moisture and swollen. Long-term moisture build-up under the slab, a plumbing leak, and the removal of a large tree are described causes.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#faq-1","section":"signs","topic":"Interior floor hump"},{"question":"Can a plumbing leak raise my floor?","answer":"Yes. Engineering guidance lists leaking utility lines as a source of water that can wet the soil and cause foundation heave, and broken water or sewer pipes are described as making swelling damage worse.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#faq-2","section":"signs","topic":"Interior floor hump"},{"question":"Can cutting down a tree near the house make the floor rise?","answer":"It can. Soil near trees removed shortly before construction may be drier and subject to localized heave, and removing a tree can cause heave as the soil re-wets, especially for trees that were there before the house was built.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#faq-3","section":"signs","topic":"Interior floor hump"},{"question":"How do I confirm a hump is real and not just uneven construction?","answer":"A relative floor elevation survey is the standard tool. Engineering guidance cautions that over short distances, under about 20 feet, built-in unevenness from construction can dominate the readings.","url":"https://terrabrain.vercel.app/signs/interior-floor-hump#faq-4","section":"signs","topic":"Interior floor hump"},{"question":"What causes a sudden sinkhole or depression near an Oklahoma house?","answer":"It can be a sinkhole over dissolving gypsum or limestone, found in parts of western, northeastern and southern Oklahoma, or a washout where water removed soil.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole","section":"signs"},{"question":"Sinkhole or sudden depression: What does this sign look like?","answer":"A circular or bowl-shaped low spot appears in the yard, under a driveway or next to the foundation, sometimes over days and sometimes overnight. Nearby slabs may crack or drop. Any foundation type can be affected, including slab-on-grade, crawl space and flatwork.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#what-does-this-sign-look-like","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"What is a sinkhole?","answer":"A sinkhole is an area of ground with no natural surface drainage, so rainwater collects in it and drains underground. Sinkholes range from a few feet to hundreds of acres across.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#what-is-a-sinkhole","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"Where do sinkholes occur in Oklahoma?","answer":"Gypsum and anhydrite lie within about 30 meters of the surface across roughly 4 percent of Oklahoma, including the Permian Blaine gypsum of western Oklahoma. Gypsum karst can develop fast enough, on a human time scale, to threaten highways and other structures.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#where-do-sinkholes-occur-in-oklahoma","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"Sinkhole or sudden depression: What are washouts and other human causes?","answer":"Not every depression is karst. Human activities linked to sinkholes include groundwater pumping, construction, and changes to natural drainage, as well as leaking pipes beneath roads and buildings.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#what-are-washouts-and-other-human-causes","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"Sinkhole or sudden depression: How is it investigated?","answer":"Probing and drilling locate soft zones and voids directly; Geophysics. Researchers in western Oklahoma combined electrical resistivity, electromagnetic and seismic methods to map solution cavities in gypsum; Reporting.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#how-is-it-investigated","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"Does Oklahoma have sinkholes?","answer":"Yes. Limestone and dolomite karst occurs mainly in the Ozark area of northeast Oklahoma and the Arbuckle Mountains, and gypsum and salt karst occurs in many parts of western Oklahoma. The Oklahoma Geological Survey maps sinkholes and asks residents to report them.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#faq-1","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"Can a sinkhole form quickly?","answer":"Yes. Sinkholes can develop slowly or within hours or days. Gypsum karst can form on a human time scale, fast enough to pose a collapse hazard to roads and buildings.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#faq-2","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"Can a leaking pipe cause a sinkhole?","answer":"Water moving underground, including from leaking pipes and mains, can carry soil away and leave voids. Leaking pipes beneath roads and buildings are listed as a human cause of sinkholes.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#faq-3","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"Sinkhole or sudden depression: How are voids under the ground found?","answer":"Probing and drilling locate voids directly. Geophysical methods such as electrical resistivity and seismic surveys have been used in western Oklahoma to map cavities in gypsum without drilling every spot.","url":"https://terrabrain.vercel.app/signs/sudden-depression-or-sinkhole#faq-4","section":"signs","topic":"Sinkhole or sudden depression"},{"question":"What causes center heave in an Oklahoma slab foundation?","answer":"Center heave happens when expansive clay under the middle of a slab gains moisture, often from a plumbing leak, swells and pushes the floor up.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab","section":"causes"},{"question":"What is center heave?","answer":"A slab-on-grade foundation is a concrete floor poured directly on the ground. These slabs are flexible enough that they tend to follow the shape of the soil beneath them as it moves.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#what-is-center-heave","section":"causes","topic":"Center heave under slab"},{"question":"How does center heave develop?","answer":"The slab covers the soil. Soil under a house is shielded from the weather, so its moisture can differ from soil that is exposed outside; Water reaches the soil under the center. Common sources include leaking pipes, landscape irrigation, poor drainage and groundwater.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#how-does-center-heave-develop","section":"causes","topic":"Center heave under slab"},{"question":"Why are Oklahoma soils prone to center heave?","answer":"A 2017 Oklahoma State University study using USDA soil survey data found that nearly all of Oklahoma has medium or high swelling potential, and that more than 75% of the state's bedrock units are possible sources of expansive soils.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#why-are-oklahoma-soils-prone-to-center-heave","section":"causes","topic":"Center heave under slab"},{"question":"What signs often go with center heave?","answer":"Signs that commonly appear include: - an interior floor hump near the middle of the house - ceiling-wall separation at interior walls - diagonal drywall cracks at door and window openings - floor tile cracks running in a line - an unexplained high water bill when a supply leak is feeding the soil","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#what-signs-often-go-with-center-heave","section":"causes","topic":"Center heave under slab"},{"question":"Is it center heave or edge settlement?","answer":"Center heave and perimeter drying settlement can both leave a floor that is high in the middle. The difference is which part actually moved.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#is-it-center-heave-or-edge-settlement","section":"causes","topic":"Center heave under slab"},{"question":"Center heave under slab: How is the water source found?","answer":"The U.S. EPA describes a simple whole-house leak check: read the water meter, use no water for two hours, and read it again; a change suggests a leak. The EPA also notes that a family of four using more than 12,000 gallons a month in winter probably has a leak.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#how-is-the-water-source-found","section":"causes","topic":"Center heave under slab"},{"question":"How is center heave typically addressed?","answer":"Remove the water source. Leaks found during testing are repaired; Monitor. The Texas ASCE guidelines note that non-structural measures followed by monitoring may be prudent before, or instead of, structural repairs; Cosmetic repairs.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#how-is-center-heave-typically-addressed","section":"causes","topic":"Center heave under slab"},{"question":"What is center heave in a slab foundation?","answer":"Center heave is upward movement of the middle of a slab-on-grade floor. It happens when clay soil under the covered center gains moisture over time and swells, and engineers associate it with long-term moisture gain, often in older foundations.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#faq-1","section":"causes","topic":"Center heave under slab"},{"question":"Center heave under slab: Can a plumbing leak cause the middle of my floor to rise?","answer":"Yes. Leaking water or sewer lines add water to the soil around them, and on expansive clay that extra water can make the soil swell. Texas engineering guidelines say supply and drain lines should be tested for leaks when lifting is part of a repair.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#faq-2","section":"causes","topic":"Center heave under slab"},{"question":"How can I tell center heave from the edges of the house sinking?","answer":"Both can produce a floor that is high in the middle. A single elevation survey only shows the shape at one moment; comparing repeated surveys, or a survey against reference points from original construction, shows whether the center went up or the edges went down.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#faq-3","section":"causes","topic":"Center heave under slab"},{"question":"Is center heave common in Oklahoma?","answer":"Oklahoma State University research found that nearly all of Oklahoma has medium or high soil swelling potential, so the expansive clay that center heave requires is widespread in the state.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#faq-4","section":"causes","topic":"Center heave under slab"},{"question":"Center heave under slab: How do I check for a hidden water leak?","answer":"The U.S. EPA describes a simple meter test: note the water meter reading, use no water for two hours, then read it again. A change suggests a leak somewhere in the system.","url":"https://terrabrain.vercel.app/causes/center-heave-moisture-build-up-under-slab#faq-5","section":"causes","topic":"Center heave under slab"},{"question":"What causes common foundation symptoms in Oklahoma homes?","answer":"Most foundation symptoms have more than one possible cause; in Oklahoma, clay soil that shrinks and swells with moisture is widespread.","url":"https://terrabrain.vercel.app/guides/symptom-matrix","section":"guides"},{"question":"How do you use this table?","answer":"Start with the symptom you see, then read the matching sign and cause pages; for example, a stair-step crack wider at the top usually leads to perimeter drying settlement, and an interior floor hump often leads to center heave or leak-induced heave.","url":"https://terrabrain.vercel.app/guides/symptom-matrix#how-do-you-use-this-table","section":"guides","topic":"Symptom lookup table"},{"question":"Why do symptom patterns matter?","answer":"The location of damage relative to a water source can separate causes. In one documented claim, settlement was concentrated along the footings nearest a plumbing leak, with little or none about 5 feet away.","url":"https://terrabrain.vercel.app/guides/symptom-matrix#why-do-symptom-patterns-matter","section":"guides","topic":"Symptom lookup table"},{"question":"Symptom lookup table: Does a crack in my wall mean my foundation is failing?","answer":"Not by itself. A single crack does not necessarily mean serious structural damage. Engineers evaluate distress together with tilt and deflection measured on an elevation survey.","url":"https://terrabrain.vercel.app/guides/symptom-matrix#faq-1","section":"guides","topic":"Symptom lookup table"},{"question":"Symptom lookup table: What are the common warning signs of foundation movement in Oklahoma?","answer":"Commonly reported signs include new or widening cracks in brick or drywall, stair-step cracks in brick, sloped floors, doors or windows that suddenly stick, trim pulling away, and a gap between the soil and the house.","url":"https://terrabrain.vercel.app/guides/symptom-matrix#faq-2","section":"guides","topic":"Symptom lookup table"},{"question":"Symptom lookup table: Can a home inspector tell me what is causing the movement?","answer":"No. Oklahoma's home inspector standards require inspectors to describe indicators of foundation or structural movement, but they are not required to determine the cause or the repair method.","url":"https://terrabrain.vercel.app/guides/symptom-matrix#faq-3","section":"guides","topic":"Symptom lookup table"},{"question":"Can one symptom have more than one cause?","answer":"Yes. A sloping floor, for example, can come from perimeter drying, fill settlement, soft soils or framing problems, which is why the pattern of several symptoms and a floor-level survey are used together.","url":"https://terrabrain.vercel.app/guides/symptom-matrix#faq-4","section":"guides","topic":"Symptom lookup table"},{"question":"What causes foundation problems in the Tulsa, Oklahoma metro?","answer":"Most Tulsa foundation movement comes from shale clays that swell and shrink with about 41 inches of yearly rain; sandstone hills and floodplains add others.","url":"https://terrabrain.vercel.app/regions/tulsa-metro","section":"regions"},{"question":"What is the Tulsa climate like?","answer":"Tulsa's 1991–2020 normal precipitation is about 40.96 inches a year. May is the wettest month at about 5.73 inches, and January and February are the driest at about 1.6 inches each. That pattern matters because clay soil changes volume as its moisture changes.","url":"https://terrabrain.vercel.app/regions/tulsa-metro#what-is-the-tulsa-climate-like","section":"regions","topic":"Tulsa metro soils"},{"question":"What are the three ground settings in the metro?","answer":"Much of the gently rolling ground in the metro has soils formed from Pennsylvanian shale, an old layered mudrock. Examples include:","url":"https://terrabrain.vercel.app/regions/tulsa-metro#what-are-the-three-ground-settings-in-the-metro","section":"regions","topic":"Tulsa metro soils"},{"question":"Which soil series are common in Tulsa?","answer":"The Tulsa soil series guide covers more series, including Okemah, Coweta, Bates and Apperson.","url":"https://terrabrain.vercel.app/regions/tulsa-metro#which-soil-series-are-common-in-tulsa","section":"regions","topic":"Tulsa metro soils"},{"question":"Tulsa metro soils: How does rock in the soil survey compare to pier depth?","answer":"Soil surveys only describe roughly the top 5 feet, so \"depth to rock\" in a survey is not where a deep foundation pier stops.","url":"https://terrabrain.vercel.app/regions/tulsa-metro#how-does-rock-in-the-soil-survey-compare-to-pier-depth","section":"regions","topic":"Tulsa metro soils"},{"question":"Which moisture practices matter in Tulsa?","answer":"Because so much Tulsa movement is moisture-driven, the ASCE homeowner guide lists practical steps for clay sites:","url":"https://terrabrain.vercel.app/regions/tulsa-metro#which-moisture-practices-matter-in-tulsa","section":"regions","topic":"Tulsa metro soils"},{"question":"Why do Tulsa houses move so much in spring and late summer?","answer":"Much of the metro sits on clay soils weathered from shale that swell when wet and shrink when dry. May is normally the wettest month, and summer drying follows, so the soil under a house edge can go through a large wet-dry swing each year.","url":"https://terrabrain.vercel.app/regions/tulsa-metro#faq-1","section":"regions","topic":"Tulsa metro soils"},{"question":"Is there rock close to the surface in Tulsa?","answer":"On sandstone hills and ridges, soil surveys record rock within about 4 to 20 inches in soils such as Collinsville. In the shale lowlands, soils like Dennis and Summit are more than 60 inches deep, so rock depth varies a great deal from one neighborhood to the next.","url":"https://terrabrain.vercel.app/regions/tulsa-metro#faq-2","section":"regions","topic":"Tulsa metro soils"},{"question":"How deep do steel piers usually go in Tulsa?","answer":"Field records from Tulsa installations show a median refusal depth of about 12 feet, with most exterior piers between roughly 8 and 16 feet. The soil survey 'depth to rock' is not the same as the depth where a pier stops.","url":"https://terrabrain.vercel.app/regions/tulsa-metro#faq-3","section":"regions","topic":"Tulsa metro soils"},{"question":"What is perched water and why does it matter in Tulsa?","answer":"Perched water is a temporary, shallow water table that sits on top of a dense clay or shale layer. Several Tulsa soils hold perched water from late fall through spring, which can wet crawl spaces and swell clay under slab edges.","url":"https://terrabrain.vercel.app/regions/tulsa-metro#faq-4","section":"regions","topic":"Tulsa metro soils"},{"question":"What causes sinkholes and karst subsidence in Oklahoma?","answer":"Groundwater dissolves gypsum, salt or limestone, forming cavities the soil above can sag or collapse into. Oklahoma has karst in the west, northeast and south.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes","section":"causes"},{"question":"How do karst sinkholes form?","answer":"Sinkholes form where groundwater moving through soluble rock dissolves it and creates underground cavities. The ground above may hold for a time, then fail when a cavity grows too large to support it.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#how-do-karst-sinkholes-form","section":"causes","topic":"Karst and sinkholes"},{"question":"Where is karst found in Oklahoma?","answer":"Gypsum is highly soluble and forms karst features much like limestone does; gypsum karst in the U.S. has been linked to highway subsidence, dam failure and foundation cracking.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#where-is-karst-found-in-oklahoma","section":"causes","topic":"Karst and sinkholes"},{"question":"What are the signs of karst subsidence?","answer":"a sudden depression or sinkhole in the yard or under a slab; sloping floors toward one area; stair-step cracks in brick that are wider at the top.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#what-are-the-signs-of-karst-subsidence","section":"causes","topic":"Karst and sinkholes"},{"question":"How does karst differ from shallow erosion voids?","answer":"Not every sinkhole is karst. The OGS notes that most of the sinkholes expected after Oklahoma's heavy April 2025 rains were small ones where water flowed beneath roads and driveways, eroding soil rather than dissolving bedrock.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#how-does-karst-differ-from-shallow-erosion-voids","section":"causes","topic":"Karst and sinkholes"},{"question":"How is karst evaluated?","answer":"In a 2010 study of gypsum karst risk in northwestern Oklahoma, geologists recommended gathering subsurface data from petroleum test records and core borings and surveying local landowners about past sinkholes or collapses.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#how-is-karst-evaluated","section":"causes","topic":"Karst and sinkholes"},{"question":"What causes sinkholes in Oklahoma?","answer":"Karst sinkholes form where groundwater dissolves soluble rock such as gypsum, salt, limestone or dolomite, creating cavities that the ground above eventually settles or collapses into. Smaller sinkholes can also form when flowing water erodes soil beneath roads and driveways.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#faq-1","section":"causes","topic":"Karst and sinkholes"},{"question":"Where is gypsum karst found in Oklahoma?","answer":"Gypsum and shallow salt deposits occur in many areas of western Oklahoma. The thickest gypsum is in the southwest, mainly across about 600 square miles in Beckham, Greer and Jackson Counties, where the Blaine Formation contains up to about 150 feet of massive gypsum.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#faq-2","section":"causes","topic":"Karst and sinkholes"},{"question":"Where is limestone karst found in Oklahoma?","answer":"Limestone and dolomite karst occurs mainly in the Ozark region of northeastern Oklahoma and the Arbuckle Mountains of southern Oklahoma, with karst also noted in the Limestone Hills.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#faq-3","section":"causes","topic":"Karst and sinkholes"},{"question":"Can gypsum karst crack a foundation?","answer":"Yes. Geologists have linked gypsum karst in the United States to highway subsidence, dam failure and foundation cracking, and the Oklahoma Geological Survey notes that evaporite karst can damage or collapse homes and buildings.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#faq-4","section":"causes","topic":"Karst and sinkholes"},{"question":"Karst and sinkholes: How do I report a sinkhole in Oklahoma?","answer":"The Oklahoma Geological Survey accepts sinkhole reports through an online survey as part of its work on a statewide subsidence map.","url":"https://terrabrain.vercel.app/causes/karst-subsidence-and-sinkholes#faq-5","section":"causes","topic":"Karst and sinkholes"},{"question":"What causes sloping floors in an Oklahoma house?","answer":"Causes range from a drying slab edge to settling interior piers; slopes over about 1 percent are usually noticeable, and an elevation survey finds the cause.","url":"https://terrabrain.vercel.app/signs/sloping-floors","section":"signs"},{"question":"Sloping floors: What does this sign look like?","answer":"Floors run downhill toward one wall or corner, doors swing open or shut on their own, and furniture or cabinets sit out of level.","url":"https://terrabrain.vercel.app/signs/sloping-floors#what-does-this-sign-look-like","section":"signs","topic":"Sloping floors"},{"question":"Sloping floors: How much slope is noticeable?","answer":"Engineering guidance gives these reference points:","url":"https://terrabrain.vercel.app/signs/sloping-floors#how-much-slope-is-noticeable","section":"signs","topic":"Sloping floors"},{"question":"What causes sloping floors?","answer":"Other listed mechanisms, such as fill consolidation and soft soil consolidation, are covered in the causes section of this library.","url":"https://terrabrain.vercel.app/signs/sloping-floors#what-causes-sloping-floors","section":"signs","topic":"Sloping floors"},{"question":"How are sloping floors measured?","answer":"Elevation survey. A relative floor elevation survey, with readings drawn on a floor plan, is the level of evaluation engineering guidance uses beyond a first impression. See elevation surveys; Short-distance caution.","url":"https://terrabrain.vercel.app/signs/sloping-floors#how-are-sloping-floors-measured","section":"signs","topic":"Sloping floors"},{"question":"Sloping floors: How much floor slope is too much?","answer":"Engineering guidance notes that a floor slope greater than 1 percent is usually noticeable, and the Americans with Disabilities Act treats a 2 percent slope as too large. Whether slope is structurally significant is judged with an elevation survey and visible distress together.","url":"https://terrabrain.vercel.app/signs/sloping-floors#faq-1","section":"signs","topic":"Sloping floors"},{"question":"What causes floors to slope in a house?","answer":"Common causes include the soil under the outside edge drying and shrinking, trees drawing moisture from the soil, settlement where additions or porches meet the house, soft or poorly compacted soil, sinkholes in soluble rock areas, and settling interior piers in crawl space homes.","url":"https://terrabrain.vercel.app/signs/sloping-floors#faq-2","section":"signs","topic":"Sloping floors"},{"question":"Is a sloping floor always a foundation problem?","answer":"No. Original construction leaves some built-in unevenness, and over short distances, under about 20 feet, that unevenness can dominate floor readings. A survey across the whole house shows whether there is a consistent pattern of movement.","url":"https://terrabrain.vercel.app/signs/sloping-floors#faq-3","section":"signs","topic":"Sloping floors"},{"question":"How are sloping floors measured?","answer":"With a relative floor elevation survey, which records the height of the floor at many points and draws them on a plan. Engineering guidance treats this survey as the step beyond a visual first impression.","url":"https://terrabrain.vercel.app/signs/sloping-floors#faq-4","section":"signs","topic":"Sloping floors"},{"question":"What Cretaceous rocks and soils lie under southern Oklahoma?","answer":"Layers of clay, shale, marl, limestone and sand; the clay and shale weather into very expansive soils, while sand layers give loose, well-drained soils.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones","section":"geology"},{"question":"What are these rocks and where are they?","answer":"The Cretaceous Period ran from about 145 to 66 million years ago, and in the Late Cretaceous most of Oklahoma was covered by a shallow sea. Rocks from that time are preserved in southern Oklahoma, including the Tishomingo and Atoka areas.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones#what-are-these-rocks-and-where-are-they","section":"geology","topic":"Cretaceous rocks, south OK"},{"question":"Cretaceous rocks, south OK: Why do they form two very different soils?","answer":"The Durant soil formed in clayey material weathered from Cretaceous shale and claystone, with its typical profile in Bryan County, Oklahoma. Its clay is smectitic, meaning it is dominated by smectite, the clay mineral family that swells most when it takes up water.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones#why-do-they-form-two-very-different-soils","section":"geology","topic":"Cretaceous rocks, south OK"},{"question":"Cretaceous rocks, south OK: What are the practical points for homeowners?","answer":"Look up the soil series for the lot. A clay series like Durant and a sandy series like Bernow call for different explanations of the same crack; On the clay soils, keeping moisture even around the foundation is the main lever.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones#what-are-the-practical-points-for-homeowners","section":"geology","topic":"Cretaceous rocks, south OK"},{"question":"Where are Cretaceous rocks in Oklahoma?","answer":"They occur across southern Oklahoma. Early USGS mapping around Tishomingo and Atoka described them as nearly flat layers dipping gently south.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones#faq-1","section":"geology","topic":"Cretaceous rocks, south OK"},{"question":"Why are some soils on Cretaceous rock so expansive?","answer":"Clayey Cretaceous shale weathers to smectite clay, the mineral family that swells most when wet. The Durant soil, formed from this material, develops cracks wider than 1 centimeter and about 30 inches deep in dry periods.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones#faq-2","section":"geology","topic":"Cretaceous rocks, south OK"},{"question":"Are all Cretaceous soils clayey?","answer":"No. Sandstone and sand layers weather to well-drained sandy and loamy soils such as Bernow, which have much lower swell potential but can erode.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones#faq-3","section":"geology","topic":"Cretaceous rocks, south OK"},{"question":"Cretaceous rocks, south OK: How can I tell which one is under my house?","answer":"The USDA Web Soil Survey maps soil series by address. A clay series like Durant and a sandy series like Bernow can occur within a short distance of each other because the rock layers alternate.","url":"https://terrabrain.vercel.app/geology/cretaceous-shales-clays-and-sandstones#faq-4","section":"geology","topic":"Cretaceous rocks, south OK"},{"question":"What did an engineer specify for a previously piered Sand Springs house?","answer":"21 perimeter steel piers at least 10 ft below the footing, 10 to 15 interior helical piers with foam, and a duct camera check, for active clay and additions.","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers","section":"case-studies"},{"question":"Sand Springs re-piering scope: What did the house show?","answer":"The engineer inspected the house in May 2025. It is a two-story wood-frame house with brick veneer. The garage is an addition, and a former garage was converted to living space. The foundation is a slab-on-grade with continuous perimeter footings and a floating floor slab.","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers#what-did-the-house-show","section":"case-studies","topic":"Sand Springs re-piering scope"},{"question":"Sand Springs re-piering scope: What did the engineer find was causing it?","answer":"The engineer named three factors:","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Sand Springs re-piering scope"},{"question":"Sand Springs re-piering scope: What repair was specified?","answer":"Perimeter (item 1). 21 perimeter piers, shown at 9 ft dimensions on the plan, with equal spacing where none is given. The engineer's pier specification requires:","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers#what-repair-was-specified","section":"case-studies","topic":"Sand Springs re-piering scope"},{"question":"Sand Springs re-piering scope: What does this case show about Oklahoma foundations?","answer":"Shale is both the problem and the target. A federal survey of expansive materials identifies clay-rich sediments and shales as the most troublesome expansive materials.","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Sand Springs re-piering scope"},{"question":"Sand Springs re-piering scope: What is a pier log?","answer":"A record the engineer required for every pier: depth, pier type, diameter, driving pressure and amount of lift.","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers#faq-1","section":"case-studies","topic":"Sand Springs re-piering scope"},{"question":"Sand Springs re-piering scope: Why are additions expected to move separately?","answer":"The engineer noted that the garage and converted room were additions, so independent movement at the joints with the original house is expected.","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers#faq-2","section":"case-studies","topic":"Sand Springs re-piering scope"},{"question":"Sand Springs re-piering scope: Why use helical piers inside and steel piers outside?","answer":"The engineer specified steel push piers under the perimeter footings and helical piers under interior load-bearing walls, with foam injection elsewhere under the slab.","url":"https://terrabrain.vercel.app/case-studies/sand-springs-two-story-additions-perimeter-and-interior-piers#faq-3","section":"case-studies","topic":"Sand Springs re-piering scope"},{"question":"What did an engineer specify for a south Tulsa slab with failing walls?","answer":"4 perimeter steel piers, 10 to 15 interior helical piers with foam, crack stitching, new retaining walls and channel drains, for active clay movement.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls","section":"case-studies"},{"question":"South Tulsa slab and walls: What did the house show?","answer":"The engineer inspected the house in January 2026. It is a two-story wood-frame house with brick veneer, an attached two-car garage and a partly converted attic. The lot has a pool and retaining walls.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls#what-did-the-house-show","section":"case-studies","topic":"South Tulsa slab and walls"},{"question":"South Tulsa slab and walls: What did the engineer find was causing it?","answer":"The engineer named shrink-swell of active clay under the perimeter and slab, and ineffective surface drainage at the back of the house.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"South Tulsa slab and walls"},{"question":"South Tulsa slab and walls: What repair was specified?","answer":"Perimeter piers. 4 perimeter steel piers at spacings of 2 to 7 ft shown on the plan. They must penetrate at least 10 ft below the bottom of the foundation into firm, stable strata, and be driven to refusal on bedrock (blue shale) per the detail.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls#what-repair-was-specified","section":"case-studies","topic":"South Tulsa slab and walls"},{"question":"South Tulsa slab and walls: What does this case show about Oklahoma foundations?","answer":"Ponding near a slab matters on clay. ASCE's homeowner guide for shrink-swell soils warns that ponding water near a foundation can cause localized heave. It recommends checking grading and drainage every year.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"South Tulsa slab and walls"},{"question":"South Tulsa slab and walls: When does an engineer accept foam instead of interior piers?","answer":"Here foam injection was acceptable under the slab only if warranted against all slab movement. The engineer noted that foam rests on the existing soil, not on bedrock.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls#faq-1","section":"case-studies","topic":"South Tulsa slab and walls"},{"question":"South Tulsa slab and walls: Are uneven upstairs floors always a foundation problem?","answer":"No. In this house the engineer attributed uneven upstairs floors over the garage to sagging floor framing and specified framing repair, not piers.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls#faq-2","section":"case-studies","topic":"South Tulsa slab and walls"},{"question":"South Tulsa slab and walls: Why replace pool channel drains as part of a foundation repair?","answer":"The existing channel drains were damaged and painted over, and water was pooling on the patio. The engineer called for 4 in. channel drains placed to stop the pooling.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-two-story-slab-piers-and-retaining-walls#faq-3","section":"case-studies","topic":"South Tulsa slab and walls"},{"question":"What did an engineer specify for an 80-year-old Tulsa basement house?","answer":"15 exterior steel piers, a rebuilt stairwell wall, new beams and posts, porch foam and a new sump pump, for age-related settlement and basement water.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall","section":"case-studies"},{"question":"What did the house show?","answer":"The engineer inspected the house in January 2014. It is a two-level timber house with brick veneer and a basement. The stem walls are clay vitreous tile, the basement walls are brick masonry on spread footings, and the floor is framed with 2x10 joists at 16 in. on center.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall#what-did-the-house-show","section":"case-studies","topic":"Older Tulsa basement house"},{"question":"Older Tulsa basement house: What did the engineer find was causing it?","answer":"The engineer described the movement as age-related settlement plus long-term deflection of the timber framing, typical of a house of this age. Poor maintenance and basement water added to it.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Older Tulsa basement house"},{"question":"Older Tulsa basement house: What repair was specified?","answer":"The report was a ten-item scope:","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall#what-repair-was-specified","section":"case-studies","topic":"Older Tulsa basement house"},{"question":"Older Tulsa basement house: What does this case show about Oklahoma foundations?","answer":"Old houses need the footing checked before piering. Clay tile stem walls are an older construction type. The engineer made verifying the footing part of the pier scope and noted that a supplemental footing may be required; Basement water is part of the structural picture.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Older Tulsa basement house"},{"question":"Older Tulsa basement house: Why might an engineer say a supplemental footing could be needed before piering?","answer":"This house had clay vitreous tile stem walls. The engineer asked that the foundation construction be verified before piering and noted that a supplemental footing may be required, because a pier can only lift what sits on a sound footing.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall#faq-1","section":"case-studies","topic":"Older Tulsa basement house"},{"question":"Older Tulsa basement house: Can new beams fully remove old floor sag?","answer":"Not always. Here the engineer specified LVL beams on new posts but expected only partial recovery of the long-term deflection in the floor framing.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall#faq-2","section":"case-studies","topic":"Older Tulsa basement house"},{"question":"What did the engineer do about water in the basement?","answer":"The sump pump was dead and there was seepage at the walls and floor. The engineer called for a new sump pump, hydraulic cement on the basement walls, and epoxy floor paint.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1930s-basement-house-settlement-and-failed-stairwell-wall#faq-3","section":"case-studies","topic":"Older Tulsa basement house"},{"question":"What did an engineer specify when old piers stopped holding in south Tulsa?","answer":"Cracks reopened along a previously piered garage wall; the engineer said to repressurize those piers or replace them, add 3 new piers, and level the slab.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers","section":"case-studies"},{"question":"South Tulsa old piers repressurized: What did the house show?","answer":"Stone veneer separations at the southeast corners of both the house and the garage; Hairline to 1/8 in. cracks on the south, east and west walls and on the chimney; Hairline to 1/4 in. interior cracks throughout, and floor cracks in the entry, kitchen, living room and hall bath.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#what-did-the-house-show","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"South Tulsa old piers repressurized: What did the engineer find was causing it?","answer":"Shrink-swell movement of active clay soil, together with loss of support from the existing piers along the garage's south wall, which were no longer holding.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"South Tulsa old piers repressurized: What repair was specified?","answer":"3 new piers at the southeast corner, shown at about 3 ft spacing near the corner, at least 10 ft below the bottom of the foundation; Repressurize the existing piers on the garage's south wall (about 9 ft spacing on the plan); if they would not repressurize, replace them with new piers; For the slab, steel slab piers about 6 ft on center, or foam injection on about a 6 ft grid with a warranty, or a combination, after consulting the engineer.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#what-repair-was-specified","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"South Tulsa old piers repressurized: What happened on the job?","answer":"The record shows the repair contractor's proposal was checked against the engineer's requirements, a plumbing leak test was provided, and an updated scope was sent in early 2026.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#what-happened-on-the-job","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"South Tulsa old piers repressurized: What does this case show about Oklahoma foundations?","answer":"This house had already been piered, yet it was moving again. The old piers were along one garage wall, and the new distress appeared at an unpiered corner, in reopened cracks along the old pier line, and in the interior slab.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"Do old piers always have to be replaced?","answer":"Not in this case. The engineer's first step was to repressurize the existing garage wall piers, and to replace them with new piers only if they would not repressurize.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#faq-1","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"South Tulsa old piers repressurized: What options did the engineer give for the slab?","answer":"Steel slab piers about 6 ft on center, foam injection on about a 6 ft grid with a warranty, or a combination, with the engineer consulted first.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#faq-2","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"South Tulsa old piers repressurized: When should the plumbing be tested?","answer":"The engineer called for a plumbing test both before and after the repair.","url":"https://terrabrain.vercel.app/case-studies/south-tulsa-repressurize-old-garage-piers#faq-3","section":"case-studies","topic":"South Tulsa old piers repressurized"},{"question":"What do diagonal drywall cracks at door corners mean?","answer":"Diagonal cracks from door and window corners are a common sign of uneven foundation movement, since corners concentrate stress.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings","section":"signs"},{"question":"Why do cracks start at openings?","answer":"A wall with a door or window is weakest at the corners of the opening, where the solid wall meets the gap. When one part of the foundation moves up or down relative to another, the wall is pulled out of square, and that distortion concentrates at those corners.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#why-do-cracks-start-at-openings","section":"signs","topic":"Diagonal drywall cracks"},{"question":"Diagonal drywall cracks: What does the crack direction tell you?","answer":"In foundation diagnosis, the working rule is that a diagonal crack tends to run toward the relatively low side of the wall. A crack that rises from a door corner toward an outside wall suggests the outer side dropped (edge settlement) or the interior rose (center heave).","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#what-does-the-crack-direction-tell-you","section":"signs","topic":"Diagonal drywall cracks"},{"question":"What causes can produce these cracks?","answer":"Less often, interior support failure in crawl spaces or an original construction deficiency is the cause.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#what-causes-can-produce-these-cracks","section":"signs","topic":"Diagonal drywall cracks"},{"question":"How do you document these cracks?","answer":"Note which corner the crack starts at and which way it runs; Measure the widest point and mark the crack ends with pencil and date; Photograph with a ruler or crack gauge in view.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#how-do-you-document-these-cracks","section":"signs","topic":"Diagonal drywall cracks"},{"question":"Diagonal drywall cracks: What are the next steps?","answer":"Use the distress pattern library to compare crack maps and the symptom matrix to weigh mechanisms.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#what-are-the-next-steps","section":"signs","topic":"Diagonal drywall cracks"},{"question":"What causes diagonal cracks above doors and windows?","answer":"The corners of openings are the weakest points in a wall, so when the wall is distorted by uneven foundation movement, cracks start there and run at an angle. Settlement from drying clay, heave from swelling clay, fill settlement, slope movement and earthquakes can all produce them.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#faq-1","section":"signs","topic":"Diagonal drywall cracks"},{"question":"Which way does a diagonal crack point?","answer":"As a working rule in foundation diagnosis, the crack tends to run toward the side that has moved down relative to the rest of the wall. Plotting crack directions on a floor elevation survey shows whether they agree with the measured low areas.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#faq-2","section":"signs","topic":"Diagonal drywall cracks"},{"question":"Are hairline drywall cracks a foundation problem?","answer":"Not always; drywall can crack for reasons unrelated to the foundation. Cracks that grow, cluster around openings, come with out-of-square door frames or uneven floors, or follow the seasons are more likely to reflect foundation movement.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#faq-3","section":"signs","topic":"Diagonal drywall cracks"},{"question":"How much movement causes visible cracks?","answer":"UK guidance on clay soils notes that cracks usually need about 5 to 10 millimeters of movement before they appear, often around windows and doors.","url":"https://terrabrain.vercel.app/signs/diagonal-drywall-cracks-at-openings#faq-4","section":"signs","topic":"Diagonal drywall cracks"},{"question":"What do foundation crack patterns in a house mean?","answer":"Stair-step brick cracks, cracks at door and window corners, sticking doors and sloping floors are movement clues, checked against floor elevation surveys.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library","section":"guides"},{"question":"How do engineers treat distress signs?","answer":"The Texas Section of the American Society of Civil Engineers (ASCE) lists 12 visible indications of foundation movement, including cracking or separating of exterior walls, rotating or buckling brick veneer, cracking of concrete foundation elements, cracking of drywall, walls separating from ceilings or floors, racking of door and window frames, and cracking or buckling of floor coverings.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#how-do-engineers-treat-distress-signs","section":"guides","topic":"Distress pattern library"},{"question":"What patterns show up in each part of a house?","answer":"Stair-step cracks that follow mortar joints in brick are one of the exterior signs listed in the ASCE homeowner guide.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#what-patterns-show-up-in-each-part-of-a-house","section":"guides","topic":"Distress pattern library"},{"question":"Distress pattern library: What is truss uplift, a common look-alike?","answer":"Canada Mortgage and Housing Corporation explains truss uplift: roof trusses bow upward when the warmer, drier bottom chord (buried in attic insulation) shrinks more than the top chord.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#what-is-truss-uplift-a-common-look-alike","section":"guides","topic":"Distress pattern library"},{"question":"Distress pattern library: How is crack width graded?","answer":"The Foundation Performance Association guideline allows crack widths to be recorded but does not set a severity scale. The UK Building Research Establishment (BRE) publishes damage categories for houses based on crack width:","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#how-is-crack-width-graded","section":"guides","topic":"Distress pattern library"},{"question":"Distress pattern library: Do cracks always mean my foundation is failing?","answer":"No. Engineering guidelines note that most cracks do not compromise structural integrity and that seeing some distress does not by itself mean a foundation is performing poorly. Patterns, crack widths, change over time and floor elevations are evaluated together.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#faq-1","section":"guides","topic":"Distress pattern library"},{"question":"Distress pattern library: How wide does a crack have to be to matter?","answer":"A widely used UK building research scale treats cracks up to about 5 mm (roughly 3/16 inch) as mainly cosmetic, 5 to 25 mm as affecting serviceability, and over 25 mm as possible structural damage. The number of cracks and whether they are growing also count.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#faq-2","section":"guides","topic":"Distress pattern library"},{"question":"Distress pattern library: Why is there a gap between my ceiling and an interior wall in winter?","answer":"A common cause is truss uplift, where roof trusses bow upward as the attic-side lumber changes moisture content. The gap typically opens in winter and closes in summer and is not caused by the foundation.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#faq-3","section":"guides","topic":"Distress pattern library"},{"question":"Distress pattern library: What signs do home inspectors look for?","answer":"Inspection standards list cracked drywall or brick, out-of-square door frames and unlevel floors as possible indications of foundation movement that should be reported.","url":"https://terrabrain.vercel.app/guides/distress-pattern-library#faq-4","section":"guides","topic":"Distress pattern library"},{"question":"What do lab tests show about Oklahoma clay soils?","answer":"Oklahoma subsoil clays mostly test with plasticity index in the high 20s to low 40s, and some western soils carry very high sulfate that affects lime treatment.","url":"https://terrabrain.vercel.app/data/soil-lab-values","section":"data"},{"question":"Oklahoma soil lab values: What do the key lab terms mean?","answer":"Liquid limit (LL): the water content at which clay starts to flow like a liquid. Higher LL usually means more clay activity; Plasticity index (PI): the range of water content over which the soil stays moldable.","url":"https://terrabrain.vercel.app/data/soil-lab-values#what-do-the-key-lab-terms-mean","section":"data","topic":"Oklahoma soil lab values"},{"question":"What do statewide soil tests show?","answer":"An Oklahoma Geological Survey geologist reported that over 75% of Oklahoma has bedrock units that can produce expansive soils, and that montmorillonite clay can swell to roughly 1.5 to 2 times its dry volume when wet.","url":"https://terrabrain.vercel.app/data/soil-lab-values#what-do-statewide-soil-tests-show","section":"data","topic":"Oklahoma soil lab values"},{"question":"What do soil tests show in central Oklahoma?","answer":"The swell is in the subsoil. Kirkland's surface layer tested at PI 4, while its subsoil tested at PI 30 to 32. The study described Kirkland as an \"inherently unstable soil\" because of its high, montmorillonite-dominated clay content; Shrink-swell is measurable.","url":"https://terrabrain.vercel.app/data/soil-lab-values#what-do-soil-tests-show-in-central-oklahoma","section":"data","topic":"Oklahoma soil lab values"},{"question":"What do soil tests show in the Tulsa area?","answer":"City of Tulsa boring reports provide measured values on weathered shale ground:","url":"https://terrabrain.vercel.app/data/soil-lab-values#what-do-soil-tests-show-in-the-tulsa-area","section":"data","topic":"Oklahoma soil lab values"},{"question":"What do soil tests show in southern and western Oklahoma?","answer":"Durant (south-central): the NRCS series description says upper subsoil horizons are 40 to 60% clay and that cracks more than 1 cm wide and 30 inches deep form during dry periods.","url":"https://terrabrain.vercel.app/data/soil-lab-values#what-do-soil-tests-show-in-southern-and-western-oklahoma","section":"data","topic":"Oklahoma soil lab values"},{"question":"What is a typical plasticity index for Oklahoma clay?","answer":"Measured subsoil values in central Oklahoma commonly fall around 27 to 41. For example, Kirkland subsoil in Canadian County tested at PI 30 to 32 and Renfrow clay in Logan County at about 33 before curing.","url":"https://terrabrain.vercel.app/data/soil-lab-values#faq-1","section":"data","topic":"Oklahoma soil lab values"},{"question":"Is Oklahoma shale itself expansive?","answer":"Not always. The U.S. Geological Survey found that the main clay minerals in Hennessey shale cored at Lake Hefner were illite and kaolinite, which have low shrink-swell potential. The soils formed on top of such rock can be far more expansive.","url":"https://terrabrain.vercel.app/data/soil-lab-values#faq-2","section":"data","topic":"Oklahoma soil lab values"},{"question":"How much of Oklahoma has expansive soil?","answer":"The Oklahoma Geological Survey reported that over 75% of Oklahoma has bedrock units that can produce expansive soils.","url":"https://terrabrain.vercel.app/data/soil-lab-values#faq-3","section":"data","topic":"Oklahoma soil lab values"},{"question":"Why does sulfate in soil matter?","answer":"When lime or similar calcium-based treatment is added to sulfate-rich soil, an expansive mineral called ettringite can form. In one Oklahoma test, 3% lime increased the swell of a high-sulfate soil by 1,237%.","url":"https://terrabrain.vercel.app/data/soil-lab-values#faq-4","section":"data","topic":"Oklahoma soil lab values"},{"question":"What do soil test numbers for expansive clay mean?","answer":"The plasticity index from Atterberg limits is a common quick indicator of shrink-swell, while swell tests measure movement and pressure directly.","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values","section":"guides"},{"question":"Soil test numbers: How do you read the plasticity index?","answer":"A commonly cited structural engineering rule of thumb:","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#how-do-you-read-the-plasticity-index","section":"guides","topic":"Soil test numbers"},{"question":"Soil test numbers: What do Oklahoma lab results show?","answer":"An Oklahoma State University study of benchmark soils measured liquid limits, plasticity and swell:","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#what-do-oklahoma-lab-results-show","section":"guides","topic":"Soil test numbers"},{"question":"Soil test numbers: Why does the moisture state matter?","answer":"The same clay can show different behavior depending on how dry it is when tested. A study of clay sites during the 2011 drought found the drought increased the soils' potential vertical rise, meaning more possible heave once they rewet.","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#why-does-the-moisture-state-matter","section":"guides","topic":"Soil test numbers"},{"question":"Soil test numbers: How many borings and samples are needed?","answer":"How a site is sampled shapes what the lab can report. As one example of a written requirement, a Virginia county policy for expansive soil areas calls for:","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#how-many-borings-and-samples-are-needed","section":"guides","topic":"Soil test numbers"},{"question":"What soil test shows whether clay is expansive?","answer":"The Atterberg limits test, which gives the liquid limit and plasticity index, is a common quick indicator. Swell tests measure the actual swelling and the pressure it can produce, but they are run less often.","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#faq-1","section":"guides","topic":"Soil test numbers"},{"question":"Soil test numbers: What plasticity index means highly expansive clay?","answer":"One engineering rule of thumb treats clays with a plasticity index under about 20 as only marginally expansive and clays above about 40 as highly expansive.","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#faq-2","section":"guides","topic":"Soil test numbers"},{"question":"How deep should soil borings go for a house?","answer":"Requirements vary by jurisdiction. As one example, a county expansive-soil policy calls for at least two borings in the building footprint, at least 5 feet deep or to refusal on non-expansive material.","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#faq-3","section":"guides","topic":"Soil test numbers"},{"question":"Are there lab results for Oklahoma soils?","answer":"Yes. A 1978 Oklahoma State University bulletin tested benchmark soils and found Kirkland subsoil had a liquid limit above 50% and was highly expansive, while Bethany and Norge were rated moderate and sandy soils slight for low buildings.","url":"https://terrabrain.vercel.app/guides/soil-testing-and-lab-values#faq-4","section":"guides","topic":"Soil test numbers"},{"question":"What does a full foundation inspection include?","answer":"It covers desk research, a homeowner interview, exterior and interior walks, a floor elevation survey, a crawl space or basement check and a report.","url":"https://terrabrain.vercel.app/guides/inspection-protocol","section":"guides"},{"question":"Foundation inspection steps: What are the levels of investigation?","answer":"The Texas Section of the American Society of Civil Engineers (ASCE) defines three levels of residential foundation investigation:","url":"https://terrabrain.vercel.app/guides/inspection-protocol#what-are-the-levels-of-investigation","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 1. What desk research happens before the visit?","answer":"Background on the lot can be gathered before anyone arrives:","url":"https://terrabrain.vercel.app/guides/inspection-protocol#1-what-desk-research-happens-before-the-visit","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 2. What is asked in the homeowner interview?","answer":"ASCE Texas guidelines call for interviewing the occupant, owner and client, where possible, about the property's history and the structure's performance, and reviewing any documents such as construction drawings or geotechnical reports.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#2-what-is-asked-in-the-homeowner-interview","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 3. What is checked on the exterior walk?","answer":"The exterior walk records cracks in brick, gaps at windows and doors, and separation of flatwork from the house. The ASCE homeowner guide recommends checking that the ground within 5 feet of the foundation drains water away.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#3-what-is-checked-on-the-exterior-walk","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 4. What is checked on the interior walk?","answer":"FPA's guideline calls for recording distress on every interior level and the exterior, noting whether it is on a wall, ceiling or floor, its position relative to doors and windows, and any sign of earlier repair; crack widths may also be recorded.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#4-what-is-checked-on-the-interior-walk","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 5. How is the elevation survey done?","answer":"The floor elevation survey is the Level B step. FPA calls for an instrument accurate to 1/8 inch or better, a repeatable reference point and readings about every 30 to 100 square feet, corrected for floor coverings. Details are on elevation surveys.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#5-how-is-the-elevation-survey-done","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 6. What is checked in the crawl space or basement?","answer":"Home inspection standards require describing the foundation type and the crawl space access, and reporting active water penetration, wood in contact with soil and signs of possible foundation movement.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#6-what-is-checked-in-the-crawl-space-or-basement","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 7. How are the findings analyzed?","answer":"Distress locations are compared with the elevation contour map, the likely mechanism is identified (see heave vs settlement), and moisture sources are listed. Level C adds tests the engineer considers appropriate, such as soil sampling and plumbing testing.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#7-how-are-the-findings-analyzed","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: 8. What goes in the written report?","answer":"ASCE Texas guidelines list possible report contents such as the authorization and scope, property description, information sources, collected data, assumptions, analysis, conclusions, recommendations and limiting conditions.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#8-what-goes-in-the-written-report","section":"guides","topic":"Foundation inspection steps"},{"question":"What happens during a foundation inspection?","answer":"A typical assessment includes background research on the site, questions about the home's history, a walk around the outside and inside to record distress, a floor elevation survey, a crawl space or basement check if present, and a written report.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#faq-1","section":"guides","topic":"Foundation inspection steps"},{"question":"Is a home inspection the same as a foundation evaluation?","answer":"No. Home inspection standards require inspectors to report signs of possible foundation movement but say they are not required to provide engineering services or judge the adequacy of structural systems.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#faq-2","section":"guides","topic":"Foundation inspection steps"},{"question":"Foundation inspection steps: What questions will I be asked about my house?","answer":"Engineering guidelines call for asking the owner or occupant about the property's history and performance, such as when problems appeared, past repairs, leaks, water bills, watering and tree changes.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#faq-3","section":"guides","topic":"Foundation inspection steps"},{"question":"Should plumbing be tested during a foundation assessment?","answer":"Engineering guidelines list plumbing testing as part of a more detailed investigation and call for testing water and drain lines when lifting is part of the repair.","url":"https://terrabrain.vercel.app/guides/inspection-protocol#faq-4","section":"guides","topic":"Foundation inspection steps"},{"question":"What does a gap at the frieze board above brick mean?","answer":"A gap between the top of the brick and the frieze board often means the foundation edge carrying the brick has dropped, commonly as perimeter clay dries.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation","section":"signs"},{"question":"Frieze board or trim gap: How does the gap form?","answer":"On a brick home, the brick veneer is a single layer of brick standing on the outer ledge of the foundation, while the roof, soffit and frieze board are attached to the wood framing. The frieze board covers the joint where the top of the brick meets the framing.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#how-does-the-gap-form","section":"signs","topic":"Frieze board or trim gap"},{"question":"Frieze board or trim gap: What is edge drop?","answer":"This site links the sign to perimeter drying settlement (edge drop). Expansive clay shrinks as it dries.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#what-is-edge-drop","section":"signs","topic":"Frieze board or trim gap"},{"question":"Frieze board or trim gap: What signs usually come with it?","answer":"Stair-step brick cracks wider at the top on the same wall; Brick separating from window or door frames; Soil pulled away from the foundation in dry weather.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#what-signs-usually-come-with-it","section":"signs","topic":"Frieze board or trim gap"},{"question":"Frieze board or trim gap: When might it not be the foundation?","answer":"A gap at trim does not always come from the foundation. Signs pointing away from the foundation include a gap that is even along a whole wall, no cracking in the brick below, and no matching interior signs.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#when-might-it-not-be-the-foundation","section":"signs","topic":"Frieze board or trim gap"},{"question":"Frieze board or trim gap: How do you document it?","answer":"Measure the gap at evenly spaced points along each wall, and at every corner; Photograph each point with a ruler in view; Note which corner has the widest gap and check the brick below it for cracks.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#how-do-you-document-it","section":"signs","topic":"Frieze board or trim gap"},{"question":"Frieze board or trim gap: What are the next steps?","answer":"Compare with the distress pattern library and the symptom matrix.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#what-are-the-next-steps","section":"signs","topic":"Frieze board or trim gap"},{"question":"What is a frieze board?","answer":"A frieze board is the trim board that runs along the top of an exterior wall, just under the eaves. On brick homes it often covers the joint where the top of the brick meets the wood framing and soffit.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#faq-1","section":"signs","topic":"Frieze board or trim gap"},{"question":"Why is there a gap between my brick and the frieze board?","answer":"The brick veneer rests on the foundation edge, while the frieze board is attached to the roof and wall framing. If the foundation edge drops, the brick drops with it and a gap opens at the top under the trim.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#faq-2","section":"signs","topic":"Frieze board or trim gap"},{"question":"Is a frieze board gap always a foundation problem?","answer":"No. A gap that is wider at one corner, comes with stair-step brick cracks below, or changes with the seasons is more likely to reflect foundation movement; an even gap with no brick cracks or interior signs points elsewhere.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#faq-3","section":"signs","topic":"Frieze board or trim gap"},{"question":"Frieze board or trim gap: How do I measure it?","answer":"Measure the gap at regular points along the wall, especially at corners, photograph each point with a ruler, and repeat through a summer and winter to see whether it changes.","url":"https://terrabrain.vercel.app/signs/frieze-board-or-trim-separation#faq-4","section":"signs","topic":"Frieze board or trim gap"},{"question":"What does a gap under the baseboard mean for my foundation?","answer":"It shows the floor and the bottom of a wall have moved apart, a listed sign of foundation movement on shrink-swell clay. A floor survey shows which part moved.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards","section":"signs"},{"question":"Gaps under baseboards: What does this sign look like?","answer":"A visible gap between the floor and the bottom edge of a baseboard, often wider at one end of the wall; Flooring that has dropped away from the trim, leaving the baseboard hanging above it; A baseboard that has been pushed up, with its top joint or caulk line cracked.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#what-does-this-sign-look-like","section":"signs","topic":"Gaps under baseboards"},{"question":"Gaps under baseboards: Why does the floor pull away from the wall?","answer":"Baseboards are nailed to the wall, and the wall and floor are separate parts of the house.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#why-does-the-floor-pull-away-from-the-wall","section":"signs","topic":"Gaps under baseboards"},{"question":"Gaps under baseboards: Which movements can open the gap?","answer":"Edge lift (perimeter wetting heave): soil under the perimeter becomes wetter than under the interior and swells; Center lift or edge drop (perimeter drying settlement, center heave): soil around the perimeter dries and shrinks; Corner lift: on a uniformly loaded rectangular slab, the corners press on the soil with about one-fourth the pressure of the center, so corners tend to lift relative to the middle when clay swells.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#which-movements-can-open-the-gap","section":"signs","topic":"Gaps under baseboards"},{"question":"Gaps under baseboards: How is it documented?","answer":"Gap width at each location, the wall it is on and the date; Repeat readings over time, since the ASCE homeowner guide advises monitoring existing cracks for progressive or seasonal movement; Nearby signs: sloping floors, doors binding or tapered gaps, diagonal drywall cracks at openings.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#how-is-it-documented","section":"signs","topic":"Gaps under baseboards"},{"question":"Gaps under baseboards: Is a gap between the floor and baseboard a foundation problem?","answer":"It can be. Civil engineering guidance lists walls separating from floors as a visible sign of inadequate foundation performance, but it also notes that seeing one listed condition does not by itself prove a structural problem.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#faq-1","section":"signs","topic":"Gaps under baseboards"},{"question":"Gaps under baseboards: Can the floor rise instead of sink?","answer":"Yes. Expansive clay that gets wetter swells and can lift a building, and soil that dries can shrink and let it settle. A gap under a baseboard shows the floor and wall moved relative to each other, not which one moved.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#faq-2","section":"signs","topic":"Gaps under baseboards"},{"question":"Gaps under baseboards: Can cutting down a tree cause the floor to rise?","answer":"Engineering guidance says removing a tree near a foundation may cause upheaval as soil moisture increases, especially if the tree was there before the house was built.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#faq-3","section":"signs","topic":"Gaps under baseboards"},{"question":"Gaps under baseboards: How is the gap measured?","answer":"The gap width is recorded at each location with the date. A homeowner guide from civil engineers advises monitoring cracks for progressive or seasonal movement, and a floor elevation survey shows where the floor is high or low.","url":"https://terrabrain.vercel.app/signs/gaps-under-baseboards#faq-4","section":"signs","topic":"Gaps under baseboards"},{"question":"What does a horizontal crack at the brick ledge or slab edge mean?","answer":"It can come from brick and concrete moving against each other, the slab edge lifting or dropping, or frost or soil pressure; a floor survey helps tell which.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge","section":"signs"},{"question":"What does this crack look like?","answer":"The brick ledge is the narrow shelf at the outside edge of a slab or grade beam (a thickened concrete beam around the perimeter) where the first row of brick sits.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge#what-does-this-crack-look-like","section":"signs","topic":"Horizontal crack at brick ledge"},{"question":"Horizontal crack at brick ledge: Why does it happen?","answer":"Fired clay brick takes on moisture and expands permanently, with most of that growth in the first weeks after firing and a slower rate for years. Concrete does the opposite and shrinks as it cures.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge#why-does-it-happen","section":"signs","topic":"Horizontal crack at brick ledge"},{"question":"Horizontal crack at brick ledge: How is it documented?","answer":"Width and offset. Record the crack width and whether one side sits higher or farther out than the other. A clean crack edge suggests recent movement, while a dirty or previously filled crack may be inactive; Change over time.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge#how-is-it-documented","section":"signs","topic":"Horizontal crack at brick ledge"},{"question":"What is the brick ledge on a slab foundation?","answer":"It is the stepped shelf along the outside edge of the slab or grade beam where the bottom course of brick veneer sits. Cracks often show up at this line because the brick and the concrete move differently.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge#faq-1","section":"signs","topic":"Horizontal crack at brick ledge"},{"question":"Is a horizontal crack at the bottom of my brick always foundation movement?","answer":"No. Clay brick expands permanently over time while concrete shrinks, and that difference alone can crack the concrete or pull brick away at the base. Soil movement such as edge lift can also cause it, so the crack is read together with an elevation survey.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge#faq-2","section":"signs","topic":"Horizontal crack at brick ledge"},{"question":"Can frost cause a crack at the slab edge in Oklahoma?","answer":"Frost heave is one possible cause of horizontal cracking in shallow elements. Inspection guidance suggests suspecting frost when the damage sits above the local frost depth or appeared after a cold snap.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge#faq-3","section":"signs","topic":"Horizontal crack at brick ledge"},{"question":"How do I tell if the crack is still moving?","answer":"A clean crack edge suggests recent movement, while a dirty or previously filled crack may be inactive. A crack monitor read over six months or more can show seasonal opening and closing.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-at-brick-ledge-or-slab-edge#faq-4","section":"signs","topic":"Horizontal crack at brick ledge"},{"question":"What does a horizontal crack or bow in a basement wall mean?","answer":"It usually means soil outside is pushing the wall harder than it was built to resist, from wet soil, swelling clay, frozen soil or poor backfill.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall","section":"signs"},{"question":"Basement wall crack or bow: What does this sign look like?","answer":"The crack runs roughly level along a poured concrete or concrete block wall, often near mid-height, and the wall above or below it may lean or bulge into the room. In block walls the crack can also follow the mortar joints in a stair-step line before turning horizontal.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#what-does-this-sign-look-like","section":"signs","topic":"Basement wall crack or bow"},{"question":"Why do basement walls get pushed in?","answer":"A basement wall works like a retaining wall: soil presses against the outside face, and the wall must resist it. The general name for this is lateral pressure, meaning sideways force. When that force grows, the wall cracks and moves inward.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#why-do-basement-walls-get-pushed-in","section":"signs","topic":"Basement wall crack or bow"},{"question":"Basement wall crack or bow: How is it documented?","answer":"Crack pattern and width. Note whether the crack is horizontal, stair-stepped or both, and whether water stains or white mineral deposits are present. A clean crack suggests recent movement, while a dirty or filled crack may be older; Amount of bow or lean.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#how-is-it-documented","section":"signs","topic":"Basement wall crack or bow"},{"question":"Basement wall crack or bow: What repair approaches exist?","answer":"Inspection guidance lists careful jacking, interior buttresses, epoxy grout injection, and lowering the outside grade to reduce pressure as repair approaches. Large bulges are described as needing to be tied back to the structure, while small ones may be pinned or rebuilt.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#what-repair-approaches-exist","section":"signs","topic":"Basement wall crack or bow"},{"question":"What causes a basement wall to crack horizontally?","answer":"The usual cause is pressure from the soil outside pushing the wall inward. Saturated soil, swelling clay, frozen soil, improper backfilling and heavy equipment vibration nearby are all described as sources of that pressure.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#faq-1","section":"signs","topic":"Basement wall crack or bow"},{"question":"Is a horizontal basement wall crack more serious than a vertical one?","answer":"Inspection guidance calls horizontal or sweeping cracks potentially serious because they mean the wall has been bent or broken by sideways force. Vertical shrinkage cracks in block walls are described as rarely serious.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#faq-2","section":"signs","topic":"Basement wall crack or bow"},{"question":"How is a leaning or bowing wall judged unsafe?","answer":"A common inspection rule says a wall is usually considered unsafe if a plumb line through its center of gravity falls outside the middle third of its base. In that case a structural engineer's evaluation is typically called for.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#faq-3","section":"signs","topic":"Basement wall crack or bow"},{"question":"Basement wall crack or bow: Does water make the pressure worse?","answer":"Yes. Clogged drains let water pressure build against the wall, and wet clay backfill swells. Most damp foundations are traced to poor surface drainage and poor backfill.","url":"https://terrabrain.vercel.app/signs/horizontal-crack-or-inward-bow-in-basement-wall#faq-4","section":"signs","topic":"Basement wall crack or bow"},{"question":"What does a stair-step brick crack wider at the bottom mean?","answer":"It suggests the wall was pushed apart from below, often as swelling clay lifted part of the foundation. An elevation survey confirms heave or settlement.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom","section":"signs"},{"question":"What does this crack look like?","answer":"The crack steps through the mortar joints in a staircase line, usually from a corner, window or door, and it opens widest near its lower end, closing to a hairline higher up. Stair-step cracking in brick veneer is a well-documented distress pattern on expansive soils.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#what-does-this-crack-look-like","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"Stair-step crack, wider at bottom: What does the taper tell you?","answer":"Movement cracks in brick taper, wide at one end and hairline at the other. The wide end marks where the wall has separated most.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#what-does-the-taper-tell-you","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"Stair-step crack, wider at bottom: What are the common causes?","answer":"Heave is upward movement of a foundation caused by soil swelling. Expansive clay absorbs water and swells, and upward movements of 6 to 8 inches or more have been reported in central Texas clays. Under a slab, the perimeter can rise when the soil swells and drop when it shrinks.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#what-are-the-common-causes","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"Stair-step crack, wider at bottom: How is heave or settlement confirmed?","answer":"Elevation survey. A relative floor elevation survey, drawn on a plan, is the engineering step beyond a visual first impression. See elevation surveys; Crack activity. A clean crack edge suggests recent movement; a dirty or previously filled crack may be inactive; Monitoring.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#how-is-heave-or-settlement-confirmed","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"What does it mean when a brick crack is wider at the bottom?","answer":"It suggests the wall has been pushed apart from below, which fits part of the foundation rising (heave) or a neighboring section dropping. Because both can produce a similar crack, an elevation survey is used to tell them apart.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#faq-1","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"Stair-step crack, wider at bottom: Can clay soil push a foundation up?","answer":"Yes. Expansive clay swells as it gains moisture, and the edges of a slab can rise when the soil under them swells. Upward movements of 6 to 8 inches or more have been reported in central Texas clays.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#faq-2","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"Can removing a tree cause this kind of crack?","answer":"It can. Soil where a tree was recently removed may be drier than the soil around it and can swell as it re-wets, causing localized heave, especially for trees that predate the house.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#faq-3","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"Stair-step crack, wider at bottom: Can piers installed during a repair be lifted?","answer":"Engineering literature notes that inadequately anchored piers can be lifted by swelling clay, and that even the full weight of the structure is usually not enough to resist expansive forces.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-bottom#faq-4","section":"signs","topic":"Stair-step crack, wider at bottom"},{"question":"What does a stair-step brick crack wider at the top mean?","answer":"It usually points to settlement: part of the foundation below dropped. On Oklahoma clay, soil drying under the slab edge, often near trees, is most common.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top","section":"signs"},{"question":"What does this crack look like?","answer":"The crack follows the mortar joints in a staircase line, usually starting near a corner, window or door, and it is visibly wider at its upper end and closes to a hairline lower down.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#what-does-this-crack-look-like","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"Stair-step crack, wider at top: What does the taper tell you?","answer":"Brick industry guidance states that foundation settlement, especially on unstable or expansive soils, can cause diagonal or stepped cracks in brick and mortar directly above the foundation, and that settlement and deflection cracks have a tapering shape.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#what-does-the-taper-tell-you","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"What commonly causes this crack?","answer":"Settlement from fill, soft alluvial soil and collapsible soil are other listed mechanisms, covered in the causes section.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#what-commonly-causes-this-crack","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"How is this crack documented?","answer":"Width at both ends. Measure the crack at the top and bottom with a crack-width card, and photograph it with a scale in the frame; Age and activity. A clean crack edge suggests recent movement; a dirty or previously filled crack may be inactive.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#how-is-this-crack-documented","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"What does a stair-step crack in brick mean?","answer":"A crack that steps up through the mortar joints is a common pattern of foundation movement in brick veneer. Brick industry guidance notes that foundation settlement, especially on unstable or expansive soils, can cause diagonal or stepped cracks in the brickwork directly above the foundation.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#faq-1","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"Why does it matter whether the crack is wider at the top?","answer":"Settlement and deflection cracks taper, wide at one end and hairline at the other. The wide end shows where the wall has pulled apart most, which helps identify which part of the foundation has moved, but an elevation survey is used to confirm it.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#faq-2","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"Is a wide crack in an old house as serious as in a new one?","answer":"Not necessarily. Inspection guidance relates crack width to building age: a half-inch crack in a new building may indicate rapid settlement, while in a 50-year-old building it may reflect slow movement of about 1/100 inch per year.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#faq-3","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"How do I know if the crack is still moving?","answer":"A clean, fresh crack edge suggests recent movement, while a dirty or previously filled crack may be inactive. A crack monitor read over six months or more can show seasonal movement.","url":"https://terrabrain.vercel.app/signs/stair-step-brick-crack-wider-at-top#faq-4","section":"signs","topic":"Stair-step crack, wider at top"},{"question":"What does it mean when clean-edged cracks appear suddenly?","answer":"Several new, sharp-edged cracks at once point to a sudden cause such as an earthquake, blasting or an impact, rather than slow seasonal clay movement.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly","section":"signs"},{"question":"Sudden clean-edged cracks: What does a \"fresh\" crack look like?","answer":"Crack faces are sharp and bright, with no rounding; No dust, cobwebs or debris inside the crack; No paint, caulk or patching compound bridging it.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#what-does-a-fresh-crack-look-like","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"How does it differ from soil-movement cracks?","answer":"Expansive clay moves on a seasonal cycle. Texas monitoring found slabs settling through the growing season and partly recovering in winter, so cracks from soil movement tend to grow, open and close over months.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#how-does-it-differ-from-soil-movement-cracks","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"Sudden clean-edged cracks: How should it be documented?","answer":"Write down the date and time the cracks were first noticed, and anything that happened just before (a felt earthquake, blasting, a storm); Take close-up photos of each crack with a ruler or coin for scale, showing the clean faces; Photograph wider views so each crack's location is clear.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#how-should-it-be-documented","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"Sudden clean-edged cracks: What are the next steps?","answer":"Compare with the distress pattern library and the symptom matrix. For insurance questions, see insurance claims.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#what-are-the-next-steps","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"What does a fresh, clean crack mean?","answer":"A crack with sharp faces and no dirt, paint or caulk inside it is recent. When several appear at the same time, that supports a sudden cause such as an earthquake or impact rather than slow soil movement.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#faq-1","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"Sudden clean-edged cracks: How do I tell an old crack from a new one?","answer":"Old cracks usually have rounded or dirty edges, dust or debris inside, paint or caulk bridging them, or a history in earlier photos. New cracks have bright, sharp faces and no coating inside.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#faq-2","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"Sudden clean-edged cracks: Could an Oklahoma earthquake have cracked my house?","answer":"Oklahoma has had many felt earthquakes since 2009, including magnitude 5.7, 5.8 and 5.0 events in 2011 and 2016. Matching the date the cracks appeared with the earthquake record is the first step.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#faq-3","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"Can soil movement cause sudden cracks?","answer":"Sometimes. Expansive clay usually moves gradually, but on clay a crack typically needs about 5 to 10 millimeters of movement before it shows, so it can seem to appear all at once; that is why the overall pattern of cracks and floor levels still needs checking.","url":"https://terrabrain.vercel.app/signs/fresh-clean-edged-cracks-appearing-suddenly#faq-4","section":"signs","topic":"Sudden clean-edged cracks"},{"question":"What drainage fixes protect a foundation on Oklahoma clay?","answer":"Grading, gutters, buried downspout lines and other drainage work move water away and keep clay at a steady moisture level rather than bone dry.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions","section":"repairs"},{"question":"Foundation drainage solutions: Why does water control matter on clay?","answer":"Expansive clay swells when it takes on water and shrinks when it dries. Lawn watering, leaking pipes and pools can create the moisture differences that damage foundations, and engineering guidance calls for positive surface drainage away from all sides of a foundation.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#why-does-water-control-matter-on-clay","section":"repairs","topic":"Foundation drainage solutions"},{"question":"Foundation drainage solutions: What are the code minimums?","answer":"Grade: the ground must fall at least 6 in within the first 10 ft from the foundation (IRC R401.3); When that is not possible: drains or swales carry water away instead.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#what-are-the-code-minimums","section":"repairs","topic":"Foundation drainage solutions"},{"question":"What drainage methods are used?","answer":"Perched water is a temporary saturated layer that sits on top of tighter clay or rock after heavy rain; it is explained in groundwater and perched water.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#what-drainage-methods-are-used","section":"repairs","topic":"Foundation drainage solutions"},{"question":"Foundation drainage solutions: Why should Oklahoma clay stay consistently moist, not dry?","answer":"Colorado State University Extension notes that both overwatering and underwatering near foundations can damage structures, and that drip irrigation near a foundation can be acceptable if well maintained.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#why-should-oklahoma-clay-stay-consistently-moist-not-dry","section":"repairs","topic":"Foundation drainage solutions"},{"question":"What signs point to drainage work?","answer":"Water standing near the foundation after rain; see water ponding near foundation; Flatwork that no longer slopes at least 2% away from the house; Erosion, washed-out soil under slab edges, or sediment fans below downspouts.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#what-signs-point-to-drainage-work","section":"repairs","topic":"Foundation drainage solutions"},{"question":"Foundation drainage solutions: How much should the ground slope away from my house?","answer":"The residential code requires the grade to fall at least 6 inches within the first 10 feet from the foundation. Where lot lines or slopes make that impossible, swales or drains are used, and paved surfaces within 10 feet must slope at least 2 percent away.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#faq-1","section":"repairs","topic":"Foundation drainage solutions"},{"question":"How far should downspouts discharge from the foundation?","answer":"Guidance for expansive soils ranges from at least 5 feet, in Colorado State University Extension advice, to at least 10 feet in Colorado Geological Survey guidance. Either way, the aim is to release roof water away from the foundation edge.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#faq-2","section":"repairs","topic":"Foundation drainage solutions"},{"question":"Can drainage work make clay foundation problems worse?","answer":"Guidance for expansive soils warns that both overwatering and underwatering near a foundation can cause damage. The goal is to remove concentrated water while keeping moisture under the edges of the foundation as even as possible.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#faq-3","section":"repairs","topic":"Foundation drainage solutions"},{"question":"Foundation drainage solutions: What is a French drain?","answer":"It is a gravel-filled trench with a perforated pipe, usually wrapped in filter fabric, that collects water below the surface and carries it to a lower outlet or sump.","url":"https://terrabrain.vercel.app/repairs/drainage-solutions#faq-4","section":"repairs","topic":"Foundation drainage solutions"},{"question":"What foundation does my Oklahoma house have, by year built?","answer":"Older Oklahoma homes more often have crawl spaces or basements, while postwar and later homes are mostly on slabs or pier-and-beam.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade","section":"guides"},{"question":"Foundation type by era: Why does the construction era matter?","answer":"It suggests the foundation type before anyone crawls under or measures the floor; It suggests the pipe materials under a slab, which matters when a leak is suspected; It tells which code rules were in force, such as footing reinforcement.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#why-does-the-construction-era-matter","section":"guides","topic":"Foundation type by era"},{"question":"Foundation type by era: What was built in each era?","answer":"Newer suburban homes have fewer age-related defects but builder-grade components, and some homes built within the past five years have already developed foundation issues.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#what-was-built-in-each-era","section":"guides","topic":"Foundation type by era"},{"question":"Foundation type by era: Why are basements rare in Oklahoma?","answer":"Oklahoma has few basements. The director of the Oklahoma Geological Survey has tied this to a high water table and red clay that expands and contracts with soil moisture, which cracks basement walls and lets water in. See basements.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#why-are-basements-rare-in-oklahoma","section":"guides","topic":"Foundation type by era"},{"question":"Foundation type by era: What pipes run under the slab?","answer":"Mixed ABS and PVC drain piping in older installations can indicate amateur work and leak-prone joints. See plumbing leaks under slab.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#what-pipes-run-under-the-slab","section":"guides","topic":"Foundation type by era"},{"question":"Foundation type by era: What are post-tensioned slabs?","answer":"A post-tensioned (PT) slab is reinforced with steel cables tightened after the concrete cures. No Oklahoma source located for this page dates when PT slabs came into local use.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#what-are-post-tensioned-slabs","section":"guides","topic":"Foundation type by era"},{"question":"Foundation type by era: Why are there so few basements in Oklahoma?","answer":"The director of the Oklahoma Geological Survey has pointed to a high water table and red clay that expands and contracts with moisture, which cracks basement walls and lets water in.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#faq-1","section":"guides","topic":"Foundation type by era"},{"question":"What foundations do older Tulsa homes have?","answer":"Older central-city Tulsa homes from the oil-boom decades often have aging basements or crawl spaces, while postwar and mid-century homes are on slab and pier-and-beam foundations that move visibly with the expansive clay.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#faq-2","section":"guides","topic":"Foundation type by era"},{"question":"Foundation type by era: When did Oklahoma start requiring more rebar in footings?","answer":"Oklahoma's amendments requiring two #4 reinforcing bars in all footings were in the state's 2018-edition residential code rule effective September 14, 2022, and carried into the 2024 edition effective September 14, 2026.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#faq-3","section":"guides","topic":"Foundation type by era"},{"question":"Foundation type by era: What drain pipe is under an older slab?","answer":"Cast iron has been used for building drains for more than 100 years, usually as the 4- to 6-inch main drain; some black ABS plastic drain pipe made in the mid-1980s was defective and cracked.","url":"https://terrabrain.vercel.app/guides/construction-era-by-decade#faq-4","section":"guides","topic":"Foundation type by era"},{"question":"What happens when a post-tension slab tendon is cut or fails?","answer":"That part of the slab loses the compression that helps it resist cracking from soil movement, and cutting a stressed tendon releases a dangerous force.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure","section":"causes"},{"question":"What is a post-tensioned slab?","answer":"A post-tensioned (PT) slab is a concrete foundation with steel cables cast inside it. Each tendon is wrapped in plastic and greased so it does not bond to the concrete.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#what-is-a-post-tensioned-slab","section":"causes","topic":"Post-tension tendon failure"},{"question":"Why is a cut tendon a hazard?","answer":"The stresses behind a stressed anchor are very high, and the engineering literature warns they can cause sudden, explosive concrete failure. Sudden loss of tension on a tendon can damage ceiling and floor finishes.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#why-is-a-cut-tendon-a-hazard","section":"causes","topic":"Post-tension tendon failure"},{"question":"What can tendon failure look like?","answer":"The typical sign is a visible slab crack, often near where work was done or along the line of a tendon. Damage at an anchor may show as cracking or spalling at the slab edge.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#what-can-tendon-failure-look-like","section":"causes","topic":"Post-tension tendon failure"},{"question":"How is tendon damage repaired?","answer":"Repairs are essentially the same whether the strand was cut or corroded: the damaged length is spliced so it can be stressed again.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#how-is-tendon-damage-repaired","section":"causes","topic":"Post-tension tendon failure"},{"question":"What is a tendon in a post-tensioned slab?","answer":"A tendon is a greased, plastic-sheathed steel cable cast into the slab and stretched with a hydraulic ram after the concrete cures. A typical residential tendon is tensioned to about 33,000 pounds, which squeezes the slab together.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#faq-1","section":"causes","topic":"Post-tension tendon failure"},{"question":"Can I cut or core into a post-tensioned slab during a remodel?","answer":"Tendons can be cut by other trades or during renovations, and the stresses behind a stressed anchor are high enough that sudden release can cause explosive concrete failure. Plumbing penetrations are normally planned to fit between tendons, which are typically 3 to 4 feet apart.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#faq-2","section":"causes","topic":"Post-tension tendon failure"},{"question":"Can a cut or corroded tendon be repaired?","answer":"Yes. Engineering literature describes the same basic repair for cut and corroded tendons: the damaged strand is spliced with a coupler or replaced and then re-stressed, after a structural engineer reviews the slab.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#faq-3","section":"causes","topic":"Post-tension tendon failure"},{"question":"What makes tendons corrode?","answer":"Tendons can corrode, especially in aggressive environments, and an anchor exposed to water or chlorides that is not properly protected is at risk. Water that gets inside the sheathing collects at low points, and wedges can corrode to the point that they can no longer grip the strand.","url":"https://terrabrain.vercel.app/causes/post-tension-tendon-failure#faq-4","section":"causes","topic":"Post-tension tendon failure"},{"question":"What is a post-tensioned slab and does it move on Oklahoma clay?","answer":"A PT slab is reinforced with steel tendons pulled tight after pouring; used on expansive clay, it still moves when clay swells or shrinks unevenly.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs","section":"foundations"},{"question":"What makes a slab post-tensioned?","answer":"Trade terms used on this page: - Tendon: a high-strength steel strand inside a plastic sheath, laid in the slab before the pour. - Stressing: pulling the tendons tight with a hydraulic jack after the concrete has gained strength, then locking them at the slab edge. - Anchor pocket: the recess at the slab edge where a tendon is locked off, later filled with grout or patching.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#what-makes-a-slab-post-tensioned","section":"foundations","topic":"Post-tensioned slabs"},{"question":"Why are PT slabs used on clay?","answer":"Clay-rich soils can swell 10% or more by volume when wetted, and volume increases of 3% or more are generally considered damaging enough that engineers call for specially designed foundations.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#why-are-pt-slabs-used-on-clay","section":"foundations","topic":"Post-tensioned slabs"},{"question":"Post-tensioned slabs: How do you identify a PT slab in Oklahoma?","answer":"Panel label: Oklahoma's adoption of the 2024 International Residential Code, effective September 14, 2026, requires post-tensioned slabs on grade to carry a label on the electrical panel door; Anchor pockets: patched circles or squares spaced along the slab edge or garage stem; Paperwork: builder plans, engineering letters or permit records.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#how-do-you-identify-a-pt-slab-in-oklahoma","section":"foundations","topic":"Post-tensioned slabs"},{"question":"How do PT slabs still move?","answer":"The tendons do not stop the soil from moving.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#how-do-pt-slabs-still-move","section":"foundations","topic":"Post-tensioned slabs"},{"question":"Post-tensioned slabs: What should be considered when repairing a PT slab?","answer":"PT slabs use the same repair families as other slabs: perimeter piers, drainage, moisture control and leak repair. Work that cuts or cores through the slab, such as interior piers, passes through the zone where tendons run.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#what-should-be-considered-when-repairing-a-pt-slab","section":"foundations","topic":"Post-tensioned slabs"},{"question":"What is a post-tensioned slab?","answer":"It is a concrete slab foundation reinforced with steel tendons that are tightened after the concrete is placed, rather than relying only on rebar or wire mesh.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#faq-1","section":"foundations","topic":"Post-tensioned slabs"},{"question":"How can I tell if my Oklahoma house has a post-tensioned slab?","answer":"Under Oklahoma's adoption of the 2024 International Residential Code, effective September 14, 2026, post-tensioned slabs on grade must be identified by a label on the electrical panel door. Older homes may show patched tendon anchor pockets along the slab edge or have builder plans that say so.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#faq-2","section":"foundations","topic":"Post-tensioned slabs"},{"question":"Can a post-tensioned slab still move on clay?","answer":"Yes. Expansive clay can still lift the edges or center of any slab when moisture changes, and research models show leaks under a slab changing how it bends.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#faq-3","section":"foundations","topic":"Post-tensioned slabs"},{"question":"Why are post-tensioned slabs used on expansive soil?","answer":"Building codes require foundations on expansive soil to be designed for it, and engineering guidance lists post-tensioned slabs among the options for swelling soils under certain conditions.","url":"https://terrabrain.vercel.app/foundations/post-tensioned-slabs#faq-4","section":"foundations","topic":"Post-tensioned slabs"},{"question":"What is Abilene soil and how does it affect Oklahoma foundations?","answer":"Abilene is a deep, well-drained terrace soil of southwest Oklahoma with a 35 to 50 percent clay subsoil that shrinks and swells with the seasons.","url":"https://terrabrain.vercel.app/soils/abilene","section":"soils"},{"question":"Abilene soil: What does the official description say?","answer":"The type location is in Haskell County, Texas, and the series was established in Taylor County, Texas, in 1915. It is described as extensive.","url":"https://terrabrain.vercel.app/soils/abilene#what-does-the-official-description-say","section":"soils","topic":"Abilene soil"},{"question":"Abilene soil: How much might it swell?","answer":"Soil scientists rate shrink-swell by linear extensibility, the percent a soil's length changes from moist to oven-dry. Under 3 percent is low, 3 to 6 moderate, 6 to 9 high and 9 or more very high.","url":"https://terrabrain.vercel.app/soils/abilene#how-much-might-it-swell","section":"soils","topic":"Abilene soil"},{"question":"Abilene soil: What does it mean for foundations?","answer":"Edge movement with moisture. Clayey soil shrinks as it dries and swells as it wets, and uneven moisture around a house causes more damage than uniform change. See perimeter drying settlement and perimeter wetting heave; Dry climate.","url":"https://terrabrain.vercel.app/soils/abilene#what-does-it-mean-for-foundations","section":"soils","topic":"Abilene soil"},{"question":"Where does Abilene soil form?","answer":"Abilene forms on Quaternary terrace deposits in southwestern Oklahoma's Red Plains. See Quaternary alluvium and terraces and the Southwest (Lawton and Red Plains) region page.","url":"https://terrabrain.vercel.app/soils/abilene#where-does-abilene-soil-form","section":"soils","topic":"Abilene soil"},{"question":"Where is Abilene soil found?","answer":"Abilene is an extensive soil of the Central Rolling Red Plains and Rolling Limestone Prairies of Texas and Oklahoma (MLRA 78). It occurs on stream terrace treads on dissected plains, mostly on slopes under 1 percent.","url":"https://terrabrain.vercel.app/soils/abilene#faq-1","section":"soils","topic":"Abilene soil"},{"question":"Is Abilene soil expansive?","answer":"Its subsoil is 35 to 50 percent clay with mixed clay mineralogy, so it has clear potential to shrink and swell. The USDA description does not list cracks or slickensides, so lot-specific shrink-swell values should be checked in the Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/abilene#faq-2","section":"soils","topic":"Abilene soil"},{"question":"Does Abilene soil contain caliche?","answer":"It has calcium carbonate accumulations. Secondary carbonates start about 10 to 28 inches down, and a calcic horizon begins between about 28 and 60 inches.","url":"https://terrabrain.vercel.app/soils/abilene#faq-3","section":"soils","topic":"Abilene soil"},{"question":"How well does Abilene soil drain?","answer":"It is well drained but has moderately slow permeability, and runoff is negligible to very low on its nearly flat slopes.","url":"https://terrabrain.vercel.app/soils/abilene#faq-4","section":"soils","topic":"Abilene soil"},{"question":"What is Apperson soil and how does it affect Oklahoma foundations?","answer":"Apperson is a smectite clay Vertisol over hard limestone 40 to 60 inches down that cracks and swells seasonally, so heave and settlement are both concerns.","url":"https://terrabrain.vercel.app/soils/apperson","section":"soils"},{"question":"Apperson soil: What does the official description say?","answer":"The typical profile is in Osage County, about 1 mile north of Foraker. Most Apperson land is native range, hay meadow or pasture, with some cropland.","url":"https://terrabrain.vercel.app/soils/apperson#what-does-the-official-description-say","section":"soils","topic":"Apperson soil"},{"question":"Apperson soil: What signs of shrink-swell are in the profile?","answer":"The USDA description reports cracks that open and close periodically, slickensides in the Btss and BCss horizons, and shiny pressure faces on the clay. Slickensides are polished, grooved surfaces formed when clay masses shear past each other as they swell.","url":"https://terrabrain.vercel.app/soils/apperson#what-signs-of-shrink-swell-are-in-the-profile","section":"soils","topic":"Apperson soil"},{"question":"Apperson soil: What is the limestone underneath like?","answer":"Apperson forms on Pennsylvanian limestone. In northeastern Oklahoma, limestone units such as the Oologah are described as blue cherty limestone with bands of black shale, about 80 to 145 feet thick. See Pennsylvanian limestones.","url":"https://terrabrain.vercel.app/soils/apperson#what-is-the-limestone-underneath-like","section":"soils","topic":"Apperson soil"},{"question":"What does Apperson soil mean for foundations?","answer":"Seasonal heave and settlement. Smectite clay over rock swells when wet and shrinks when dry, and uneven moisture causes more damage than uniform change. On this soil, slab edges can drop in late summer and rise in wet spells.","url":"https://terrabrain.vercel.app/soils/apperson#what-does-apperson-soil-mean-for-foundations","section":"soils","topic":"Apperson soil"},{"question":"Where is Apperson soil found?","answer":"Apperson occurs in north-central and northeastern Oklahoma and possibly south-central and southeastern Kansas, in the Cherokee Prairies and Bluestem Hills. Its typical profile is in Osage County near Foraker.","url":"https://terrabrain.vercel.app/soils/apperson#faq-1","section":"soils","topic":"Apperson soil"},{"question":"Is Apperson soil expansive?","answer":"Yes. It is a Vertisol with a smectitic silty clay subsoil, slickensides, and cracks that open and close periodically. Those are the soil survey's signs of strong shrink-swell.","url":"https://terrabrain.vercel.app/soils/apperson#faq-2","section":"soils","topic":"Apperson soil"},{"question":"How deep is the rock under Apperson soil?","answer":"Hard limestone lies 40 to 60 inches below the surface, about 44 inches in the typical profile.","url":"https://terrabrain.vercel.app/soils/apperson#faq-3","section":"soils","topic":"Apperson soil"},{"question":"Does Apperson soil stay wet?","answer":"It is somewhat poorly drained with slow permeability, and it has perched saturation from about December through April.","url":"https://terrabrain.vercel.app/soils/apperson#faq-4","section":"soils","topic":"Apperson soil"},{"question":"What is Bates soil and how does it affect Oklahoma foundations?","answer":"A well-drained, loamy eastern Oklahoma soil over soft sandstone at 20 to 40 inches. It swells less than nearby clays, so drainage, erosion and fill matter most.","url":"https://terrabrain.vercel.app/soils/bates","section":"soils"},{"question":"Bates soil: What does the official description say?","answer":"The type location is in Crawford County, Kansas, and the series is mapped across eastern Oklahoma. About half of Bates land is grassland and half is cropland.","url":"https://terrabrain.vercel.app/soils/bates#what-does-the-official-description-say","section":"soils","topic":"Bates soil"},{"question":"What soils are nearby?","answer":"Bates is associated with several Tulsa-area soils that behave differently:","url":"https://terrabrain.vercel.app/soils/bates#what-soils-are-nearby","section":"soils","topic":"Bates soil"},{"question":"Bates soil: How much might it swell?","answer":"Shrink-swell is rated by linear extensibility, the percent change in a soil's length from moist to dry, with under 3 percent rated low and 3 to 6 percent moderate. The Bates description gives no number.","url":"https://terrabrain.vercel.app/soils/bates#how-much-might-it-swell","section":"soils","topic":"Bates soil"},{"question":"Bates soil: What does it mean for foundations?","answer":"Water and erosion. Moderately high to high hydraulic conductivity lets water move readily through the loamy soil, so a plumbing leak or concentrated roof water can carry soil from beside a footing.","url":"https://terrabrain.vercel.app/soils/bates#what-does-it-mean-for-foundations","section":"soils","topic":"Bates soil"},{"question":"Where is Bates soil found?","answer":"Bates is an extensive soil of southeastern Kansas, eastern Oklahoma and southwestern Missouri. It occurs on interfluves and hillslopes on plains, including the Cherokee Prairies around Tulsa.","url":"https://terrabrain.vercel.app/soils/bates#faq-1","section":"soils","topic":"Bates soil"},{"question":"Is Bates soil expansive?","answer":"Bates has a fine-loamy, siliceous subsoil rather than a clayey, smectitic one, so it is not in the high shrink-swell group. Neighboring Dennis and Eram soils, which have clayey subsoils, are more likely to swell.","url":"https://terrabrain.vercel.app/soils/bates#faq-2","section":"soils","topic":"Bates soil"},{"question":"How deep is the rock under Bates soil?","answer":"Soft (paralithic) sandstone or shale lies 20 to 40 inches below the surface; about 33 inches in the typical profile.","url":"https://terrabrain.vercel.app/soils/bates#faq-3","section":"soils","topic":"Bates soil"},{"question":"What problems are common on Bates soil?","answer":"With low swell potential, the usual concerns are water: runoff, leaks washing out loamy soil beside footings, fill on sloping lots, and uneven bearing where soft rock is shallow.","url":"https://terrabrain.vercel.app/soils/bates#faq-4","section":"soils","topic":"Bates soil"},{"question":"What is Bernow soil and how does it affect Oklahoma foundations?","answer":"Bernow is a deep, well-drained loamy soil from Cretaceous sandstone with about 20 to 32 percent clay, so water, erosion and fill matter most.","url":"https://terrabrain.vercel.app/soils/bernow","section":"soils"},{"question":"Where does Bernow soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) maintains an Official Series Description (OSD) for every named soil.","url":"https://terrabrain.vercel.app/soils/bernow#where-does-bernow-soil-occur","section":"soils","topic":"Bernow soil"},{"question":"What are the key properties of Bernow soil?","answer":"\"Residuum\" means soil that weathered in place from the rock below it. The \"Bt\" horizon is the subsoil layer where clay has built up over time.","url":"https://terrabrain.vercel.app/soils/bernow#what-are-the-key-properties-of-bernow-soil","section":"soils","topic":"Bernow soil"},{"question":"Bernow soil: What do these properties mean for foundations?","answer":"Clayey soils swell when they take on water and shrink when they dry, which pushes foundations up and lets them drop as seasons change. Bernow's subsoil tops out around 32 percent clay and is loam, sandy clay loam or clay loam rather than clay.","url":"https://terrabrain.vercel.app/soils/bernow#what-do-these-properties-mean-for-foundations","section":"soils","topic":"Bernow soil"},{"question":"Bernow soil: How do you check a specific lot?","answer":"Look up the address in Web Soil Survey, which publishes soil data produced by the National Cooperative Soil Survey; Check the map unit's LEP value against the NRCS shrink-swell classes; Keep soil moisture next to the foundation as uniform as practical: slope soil away from the house and discharge downspouts away from the foundation.","url":"https://terrabrain.vercel.app/soils/bernow#how-do-you-check-a-specific-lot","section":"soils","topic":"Bernow soil"},{"question":"Is Bernow soil an expansive clay?","answer":"Bernow's subsoil is loam, sandy clay loam or clay loam with about 20 to 32 percent clay, which is much less clay than the heavy expansive clays found elsewhere in Oklahoma. The rated shrink-swell value for a specific lot is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/bernow#faq-1","section":"soils","topic":"Bernow soil"},{"question":"Where is Bernow soil found in Oklahoma?","answer":"Bernow occurs in eastern and southeastern Oklahoma, and its type location is in Bryan County near Bokchito. It forms on hillslopes of dissected plains.","url":"https://terrabrain.vercel.app/soils/bernow#faq-2","section":"soils","topic":"Bernow soil"},{"question":"How deep is Bernow soil to bedrock?","answer":"The official description classes Bernow as a deep soil, at least 80 inches thick, formed in material weathered from Cretaceous sandstone.","url":"https://terrabrain.vercel.app/soils/bernow#faq-3","section":"soils","topic":"Bernow soil"},{"question":"How can I tell if my house is on Bernow soil?","answer":"Web Soil Survey, the free USDA soil map, shows the soil map units for any address. A site investigation confirms the actual conditions on a single lot.","url":"https://terrabrain.vercel.app/soils/bernow#faq-4","section":"soils","topic":"Bernow soil"},{"question":"What is Bethany soil and how does it affect Oklahoma foundations?","answer":"Bethany is a very deep central Oklahoma soil with a silty clay subsoil of 35 to 45 percent clay, with a subsoil rated moderate in shrink-swell, so homes can move seasonally.","url":"https://terrabrain.vercel.app/soils/bethany","section":"soils"},{"question":"Where does Bethany soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Bethany in central Oklahoma and Kansas, in Major Land Resource Area 80A, the Central Rolling Red Prairies.","url":"https://terrabrain.vercel.app/soils/bethany#where-does-bethany-soil-occur","section":"soils","topic":"Bethany soil"},{"question":"What are Bethany soil's key properties?","answer":"The \"solum\" is the upper, weathered part of the soil profile (topsoil plus subsoil). Bethany land is used for small grains, grain sorghum, cotton and alfalfa, with some pasture and rangeland.","url":"https://terrabrain.vercel.app/soils/bethany#what-are-bethany-soil-s-key-properties","section":"soils","topic":"Bethany soil"},{"question":"How much does Bethany soil shrink and swell?","answer":"A 1978 Oklahoma Agricultural Experiment Station bulletin studied Bethany silt loam as one of five benchmark soils of western Oklahoma. The researchers found:","url":"https://terrabrain.vercel.app/soils/bethany#how-much-does-bethany-soil-shrink-and-swell","section":"soils","topic":"Bethany soil"},{"question":"What should you know about a Bethany lot?","answer":"Look up the map unit and its linear extensibility in Web Soil Survey; Keep soil moisture next to and under the foundation as even as practical; the ASCE guide calls this the single most useful step a homeowner can take; Grade soil away from the house and repair water or sewer leaks promptly, since leaks can cause localized movement.","url":"https://terrabrain.vercel.app/soils/bethany#what-should-you-know-about-a-bethany-lot","section":"soils","topic":"Bethany soil"},{"question":"Does Bethany soil shrink and swell?","answer":"Yes. An Oklahoma State University study of Bethany silt loam rated its subsoil moderate in shrink-swell, with the fine clay fraction largely montmorillonite, a swelling clay mineral. Its subsoil holds about 35 to 45 percent clay.","url":"https://terrabrain.vercel.app/soils/bethany#faq-1","section":"soils","topic":"Bethany soil"},{"question":"Where is Bethany soil found?","answer":"Bethany occurs in central Oklahoma and Kansas, and its type location is in Oklahoma County about 1 mile east of Wheatland. It covers about 525,000 acres.","url":"https://terrabrain.vercel.app/soils/bethany#faq-2","section":"soils","topic":"Bethany soil"},{"question":"Is there rock close to the surface in Bethany soil?","answer":"No. Bethany is a very deep soil with a solum thicker than 60 inches, formed in Pleistocene loess or alluvium over Permian shale.","url":"https://terrabrain.vercel.app/soils/bethany#faq-3","section":"soils","topic":"Bethany soil"},{"question":"How do I know if my Oklahoma City house sits on Bethany soil?","answer":"Web Soil Survey, the free USDA soil map, shows the mapped soils for any address in Oklahoma. A site investigation confirms what is under a particular house.","url":"https://terrabrain.vercel.app/soils/bethany#faq-4","section":"soils","topic":"Bethany soil"},{"question":"What is Chickasha soil and how does it affect Oklahoma foundations?","answer":"Chickasha is a well-drained loamy soil over weakly cemented Permian sandstone at 40 to 60 inches; drainage, erosion and fill matter more than swelling.","url":"https://terrabrain.vercel.app/soils/chickasha","section":"soils"},{"question":"Where does Chickasha soil occur?","answer":"According to the USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD), Chickasha occurs in Oklahoma and Texas within Major Land Resource Area 80A, the Central Rolling Red Prairies.","url":"https://terrabrain.vercel.app/soils/chickasha#where-does-chickasha-soil-occur","section":"soils","topic":"Chickasha soil"},{"question":"Chickasha soil: What are its key properties?","answer":"\"Fine-loamy\" is a soil-taxonomy family name for soils with a loamy texture and moderate clay. Most Chickasha land is cultivated to small grains, grain sorghum, cotton and improved pasture, and native vegetation is tallgrass prairie.","url":"https://terrabrain.vercel.app/soils/chickasha#what-are-its-key-properties","section":"soils","topic":"Chickasha soil"},{"question":"Chickasha soil: What do its properties mean for foundations?","answer":"Clayey soils swell when they gain water and shrink when they dry, which moves shallow foundations up and down. Chickasha's weighted clay content of 18 to 30 percent is modest.","url":"https://terrabrain.vercel.app/soils/chickasha#what-do-its-properties-mean-for-foundations","section":"soils","topic":"Chickasha soil"},{"question":"Chickasha soil: How can a specific lot be checked?","answer":"Find the map unit and its LEP in Web Soil Survey; Compare the LEP with the NRCS shrink-swell classes; Watch for stair-step brick cracks, sticking doors and sloping floors, and track existing cracks over time.","url":"https://terrabrain.vercel.app/soils/chickasha#how-can-a-specific-lot-be-checked","section":"soils","topic":"Chickasha soil"},{"question":"How deep is bedrock in Chickasha soil?","answer":"The official description gives a solum thickness of 40 to 60 inches over weakly cemented Permian sandstone. Depth can vary from place to place within a mapped area.","url":"https://terrabrain.vercel.app/soils/chickasha#faq-1","section":"soils","topic":"Chickasha soil"},{"question":"Is Chickasha soil expansive?","answer":"Chickasha is a fine-loamy soil whose subsoil is mostly sandy clay loam, with 18 to 30 percent clay in the control section. That is less clay than Oklahoma's heavy expansive clays; the rated shrink-swell for a lot is shown as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/chickasha#faq-2","section":"soils","topic":"Chickasha soil"},{"question":"Where is Chickasha soil found?","answer":"Chickasha occurs in Oklahoma and Texas in the Central Rolling Red Prairies. Its type location is in Carter County, and the series was established in Washita County.","url":"https://terrabrain.vercel.app/soils/chickasha#faq-3","section":"soils","topic":"Chickasha soil"},{"question":"What drains well and what doesn't in Chickasha soil?","answer":"The soil is well drained with moderate permeability, so water moves through it at a moderate rate until it reaches the sandstone below.","url":"https://terrabrain.vercel.app/soils/chickasha#faq-4","section":"soils","topic":"Chickasha soil"},{"question":"What is Choteau soil and how does it affect Oklahoma foundations?","answer":"Choteau is a very deep, somewhat poorly drained clayey soil with a perched water table 2.5 to 3 feet down from December through April.","url":"https://terrabrain.vercel.app/soils/choteau","section":"soils"},{"question":"Where does Choteau soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) describes Choteau as an extensive series in southeastern Kansas and eastern Oklahoma, mapped in Major Land Resource Areas 112, 116, 117 and 118.","url":"https://terrabrain.vercel.app/soils/choteau#where-does-choteau-soil-occur","section":"soils","topic":"Choteau soil"},{"question":"Choteau soil: What are its key properties?","answer":"\"Colluvium\" is soil material that has crept or washed down a slope. \"Aquic\" in the classification signals a soil that is wet for part of the year. Most Choteau land is cropland for small grains, sorghum or soybeans, with some tame pasture and native tallgrass prairie.","url":"https://terrabrain.vercel.app/soils/choteau#what-are-its-key-properties","section":"soils","topic":"Choteau soil"},{"question":"Choteau soil: What do the properties mean for foundations?","answer":"A perched water table is a local zone of saturated soil held above the main groundwater by a slowly permeable layer, usually clay. In Choteau the top of this zone sits 2.5 to 3 feet below the surface and its bottom 5 to 8 feet down, from December to April.","url":"https://terrabrain.vercel.app/soils/choteau#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Choteau soil"},{"question":"What should you know about a Choteau lot?","answer":"Look up the map unit, LEP and water table data in Web Soil Survey; Grade soil away from the foundation and route downspouts away from the house so roof water does not add to seasonal saturation; Keep sprinkler heads and planter beds from ponding water near the foundation.","url":"https://terrabrain.vercel.app/soils/choteau#what-should-you-know-about-a-choteau-lot","section":"soils","topic":"Choteau soil"},{"question":"Why is Choteau soil wet in winter and spring?","answer":"The official description reports a perched seasonal high water table with its top 2.5 to 3 feet below the surface from December to April. Water collects above slowly permeable clay layers instead of draining down quickly.","url":"https://terrabrain.vercel.app/soils/choteau#faq-1","section":"soils","topic":"Choteau soil"},{"question":"How much clay is in Choteau soil?","answer":"The subsoil is silty clay loam, clay loam, silty clay or clay with about 35 to 45 percent clay, and the typical pedon's subsoil is clay.","url":"https://terrabrain.vercel.app/soils/choteau#faq-2","section":"soils","topic":"Choteau soil"},{"question":"Where is Choteau soil found?","answer":"Choteau occurs in eastern Oklahoma and southeastern Kansas in the Cherokee Prairies and nearby areas. Its type location is in Mayes County and it was established in Wagoner County.","url":"https://terrabrain.vercel.app/soils/choteau#faq-3","section":"soils","topic":"Choteau soil"},{"question":"Does Choteau soil shrink and swell?","answer":"Clayey soils like Choteau can swell when wet and shrink when dry. The rated value for a map unit is published as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/choteau#faq-4","section":"soils","topic":"Choteau soil"},{"question":"What is Clarksville soil and how does it affect Oklahoma foundations?","answer":"A deep, cherty Ozark soil on steep slopes with fast-draining gravelly upper layers and clay 3 to 4.5 feet down; slope and runoff are the main concerns.","url":"https://terrabrain.vercel.app/soils/clarksville","section":"soils"},{"question":"Where does Clarksville soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) maps Clarksville across the Ozark region (Major Land Resource Areas 116A and 116B) of Kansas, Missouri, Oklahoma and Arkansas, as well as in dissected cherty areas of other southeastern states.","url":"https://terrabrain.vercel.app/soils/clarksville#where-does-clarksville-soil-occur","section":"soils","topic":"Clarksville soil"},{"question":"Clarksville soil: What are its key properties?","answer":"\"Loamy-skeletal\" means the soil has a large share of rock fragments mixed into a loamy matrix. Clarksville land is mostly second-growth timber of oak, hickory and shortleaf pine, with some pasture and hayland.","url":"https://terrabrain.vercel.app/soils/clarksville#what-are-its-key-properties","section":"soils","topic":"Clarksville soil"},{"question":"What is the Clarksville profile, layer by layer?","answer":"The OSD's typical profile shows how much chert the soil holds:","url":"https://terrabrain.vercel.app/soils/clarksville#what-is-the-clarksville-profile-layer-by-layer","section":"soils","topic":"Clarksville soil"},{"question":"Clarksville soil: What do the properties mean for foundations?","answer":"Clarksville occupies slopes up to 70 percent and sheds water with medium to very high runoff. On sloped sites, concentrated runoff and erosion are the main soil-related concerns; see erosion, creeks and slopes, slope creep and lateral movement and surface drainage and grading.","url":"https://terrabrain.vercel.app/soils/clarksville#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Clarksville soil"},{"question":"Clarksville soil: How is a specific lot checked?","answer":"Look up the map unit, slope class and LEP in Web Soil Survey; Check drainage within several feet of the foundation each year and monitor existing cracks.","url":"https://terrabrain.vercel.app/soils/clarksville#how-is-a-specific-lot-checked","section":"soils","topic":"Clarksville soil"},{"question":"What is Clarksville soil made of?","answer":"Clarksville is a gravelly, loamy soil full of chert fragments that lies over clayey residuum weathered from cherty dolomite or cherty limestone. Rock fragments in the typical profile range from about 20 to 70 percent by volume.","url":"https://terrabrain.vercel.app/soils/clarksville#faq-1","section":"soils","topic":"Clarksville soil"},{"question":"Where is Clarksville soil found?","answer":"It is mapped across the Ozark region of Kansas, Missouri, Oklahoma and Arkansas. In Oklahoma that means the northeastern corner of the state.","url":"https://terrabrain.vercel.app/soils/clarksville#faq-2","section":"soils","topic":"Clarksville soil"},{"question":"Is Clarksville soil shallow to bedrock?","answer":"No. The official description gives depth to bedrock as more than 80 inches, although the soil is very rocky with chert gravel and cobbles.","url":"https://terrabrain.vercel.app/soils/clarksville#faq-3","section":"soils","topic":"Clarksville soil"},{"question":"Does Clarksville soil have clay in it?","answer":"Yes, deeper down. Horizons with more than 40 percent clay begin 36 to 54 inches below the surface, under the gravelly upper layers.","url":"https://terrabrain.vercel.app/soils/clarksville#faq-4","section":"soils","topic":"Clarksville soil"},{"question":"What is Collinsville soil and how does it affect Oklahoma foundations?","answer":"Collinsville is a shallow sandy loam over hard sandstone 4 to 20 inches down, with 5 to 20 percent clay, so rock depth and runoff matter more than swelling.","url":"https://terrabrain.vercel.app/soils/collinsville","section":"soils"},{"question":"Where does Collinsville soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) maps Collinsville in Oklahoma, Kansas and Missouri, in Major Land Resource Areas 84A, 112, 118A and 118B.","url":"https://terrabrain.vercel.app/soils/collinsville#where-does-collinsville-soil-occur","section":"soils","topic":"Collinsville soil"},{"question":"What are the key properties of Collinsville soil?","answer":"The word \"Lithic\" in the classification refers to this shallow contact with hard rock, which the OSD places at 10 to 50 cm (4 to 20 inches). Collinsville land is mainly native tallgrass range, with small areas of tame pasture.","url":"https://terrabrain.vercel.app/soils/collinsville#what-are-the-key-properties-of-collinsville-soil","section":"soils","topic":"Collinsville soil"},{"question":"Collinsville soil: What do these properties mean for foundations?","answer":"Shrink-swell movement comes from clay soils that swell when wet and shrink when dry. With 5 to 20 percent clay and 30 to 75 percent sand, Collinsville has far less clay than Oklahoma's expansive clays.","url":"https://terrabrain.vercel.app/soils/collinsville#what-do-these-properties-mean-for-foundations","section":"soils","topic":"Collinsville soil"},{"question":"Collinsville soil: How do you check a specific lot?","answer":"Look up the map unit and depth-to-bedrock rating in Web Soil Survey; Route downspouts away from the foundation and grade soil to drain away from the house; Track cracks over time and check drainage around the house yearly.","url":"https://terrabrain.vercel.app/soils/collinsville#how-do-you-check-a-specific-lot","section":"soils","topic":"Collinsville soil"},{"question":"How shallow is the rock in Collinsville soil?","answer":"Hard sandstone bedrock lies 4 to 20 inches below the surface, and the typical profile reaches rock at 9 inches.","url":"https://terrabrain.vercel.app/soils/collinsville#faq-1","section":"soils","topic":"Collinsville soil"},{"question":"Is Collinsville soil expansive?","answer":"Collinsville is a loam or fine sandy loam with only 5 to 20 percent clay in all layers, so it contains little of the clay that drives shrink-swell. The rated value for a lot is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/collinsville#faq-2","section":"soils","topic":"Collinsville soil"},{"question":"Where is Collinsville soil found?","answer":"Collinsville occurs in Oklahoma, Kansas and Missouri. It was established in Tulsa County in 1935, and its type location is in Rogers County near Inola.","url":"https://terrabrain.vercel.app/soils/collinsville#faq-3","section":"soils","topic":"Collinsville soil"},{"question":"Does Collinsville soil drain well?","answer":"Yes. It is well drained to somewhat excessively drained with high saturated hydraulic conductivity, and surface runoff is medium to very high because rock is so close to the surface.","url":"https://terrabrain.vercel.app/soils/collinsville#faq-4","section":"soils","topic":"Collinsville soil"},{"question":"What is Coweta soil and how does it affect Oklahoma foundations?","answer":"Coweta is a shallow, well-drained loamy soil on eastern Oklahoma ridges over soft sandstone 10 to 20 inches down. Shallow rock and runoff are its main traits.","url":"https://terrabrain.vercel.app/soils/coweta","section":"soils"},{"question":"Where does Coweta soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Coweta in Major Land Resource Areas 84A, 112, 117 and 118 in eastern Oklahoma, and possibly southeastern Kansas and southwestern Missouri.","url":"https://terrabrain.vercel.app/soils/coweta#where-does-coweta-soil-occur","section":"soils","topic":"Coweta soil"},{"question":"What are Coweta soil's key properties?","answer":"A \"Bw\" horizon is a subsoil layer that has changed color or structure but has not gained much clay. Coweta land is mainly rangeland of tallgrass prairie, with tame pasture on slopes under 15 percent and small cultivated areas on slopes under 5 percent.","url":"https://terrabrain.vercel.app/soils/coweta#what-are-coweta-soil-s-key-properties","section":"soils","topic":"Coweta soil"},{"question":"What does Coweta soil mean for foundations?","answer":"Clay soils swell when wet and shrink when dry, which is the main driver of seasonal foundation movement. Coweta's subsoil has 10 to 30 percent clay.","url":"https://terrabrain.vercel.app/soils/coweta#what-does-coweta-soil-mean-for-foundations","section":"soils","topic":"Coweta soil"},{"question":"Coweta soil: How do you check a specific lot?","answer":"Look up the map unit, slope and depth to bedrock in Web Soil Survey; Grade soil away from the foundation and discharge downspouts away from the house; Repair leaks quickly and confirm repairs with pressure tests.","url":"https://terrabrain.vercel.app/soils/coweta#how-do-you-check-a-specific-lot","section":"soils","topic":"Coweta soil"},{"question":"How deep is Coweta soil?","answer":"Coweta is shallow. The solum and the depth to soft sandstone both range from 10 to 20 inches, and the typical profile reaches sandstone at about 15 inches.","url":"https://terrabrain.vercel.app/soils/coweta#faq-1","section":"soils","topic":"Coweta soil"},{"question":"Is Coweta soil clay?","answer":"No. Coweta is mostly loam and fine sandy loam with about 10 to 30 percent clay. The rated shrink-swell for a lot appears as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/coweta#faq-2","section":"soils","topic":"Coweta soil"},{"question":"Where is Coweta soil found?","answer":"Coweta is mapped in eastern Oklahoma and possibly southeastern Kansas and southwestern Missouri. Its type location is in Wagoner County about 11 miles northeast of the town of Coweta.","url":"https://terrabrain.vercel.app/soils/coweta#faq-3","section":"soils","topic":"Coweta soil"},{"question":"What is the difference between Coweta and Collinsville soils?","answer":"Both are shallow sandy soils over Pennsylvanian sandstone near Tulsa. Collinsville sits on hard sandstone at 4 to 20 inches, while Coweta sits on soft sandstone interbedded with shale at 10 to 20 inches.","url":"https://terrabrain.vercel.app/soils/coweta#faq-4","section":"soils","topic":"Coweta soil"},{"question":"What is crawl space encapsulation and what does code require?","answer":"Encapsulation covers the ground with a sealed vapor retarder, seals vents, insulates walls and dries the air. Code allows it as an unvented crawl space.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation","section":"repairs"},{"question":"How do vented and unvented crawl spaces differ?","answer":"The residential code (IRC Section R408) allows two approaches:","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#how-do-vented-and-unvented-crawl-spaces-differ","section":"repairs","topic":"Crawl space encapsulation"},{"question":"What does encapsulation typically include?","answer":"Removing debris, vegetation and organic material from the crawl floor, which the code requires in any crawl space; A sealed ground liner, lapped and taped at seams and attached and sealed to the stem wall; Sealing vents and the rim area to outside air.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#what-does-encapsulation-typically-include","section":"repairs","topic":"Crawl space encapsulation"},{"question":"Crawl space encapsulation: Why must water problems be fixed first?","answer":"Encapsulation does not fix bulk water. The code's crawl space section calls for raising the under-floor grade or adding a drainage system where groundwater may rise to within 6 in of the finished floor at the perimeter or where surface water does not drain readily.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#why-must-water-problems-be-fixed-first","section":"repairs","topic":"Crawl space encapsulation"},{"question":"How does encapsulation apply to manufactured homes?","answer":"For manufactured homes, HUD's installation standard requires a vapor retarder of at least 6-mil polyethylene covering the ground whenever the space under the home is skirted or enclosed, with joints overlapped at least 12 in and tears repaired, unless the home is in an arid region with dry soil.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#how-does-encapsulation-apply-to-manufactured-homes","section":"repairs","topic":"Crawl space encapsulation"},{"question":"How does encapsulation relate to structural repair?","answer":"Encapsulation protects new or repaired framing from moisture but does not re-support a sagging floor. Rot, failed shims and settled piers are addressed under crawl space repair, and the moisture mechanism is described in crawl space moisture and wood decay.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#how-does-encapsulation-relate-to-structural-repair","section":"repairs","topic":"Crawl space encapsulation"},{"question":"What is crawl space encapsulation?","answer":"It turns a vented crawl space into a closed, unvented one: the ground is covered with a sealed vapor retarder, vents are closed, walls are usually insulated, and the air is dried or conditioned.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#faq-1","section":"repairs","topic":"Crawl space encapsulation"},{"question":"What does the code require for an unvented crawl space?","answer":"A continuous Class I vapor retarder over all exposed earth with seams lapped at least 6 inches and sealed, the retarder carried at least 6 inches up the stem wall, and one of several air-control methods such as continuous exhaust, conditioned supply air or dehumidification.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#faq-2","section":"repairs","topic":"Crawl space encapsulation"},{"question":"Does encapsulation stop water from coming into a crawl space?","answer":"No. A vapor retarder controls moisture rising from the soil and humid air, but standing water from poor grading or a high water table is handled with grading and drainage, which the code addresses separately.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#faq-3","section":"repairs","topic":"Crawl space encapsulation"},{"question":"Crawl space encapsulation: Do manufactured homes need a vapor barrier under them?","answer":"HUD's installation standard requires a ground-cover vapor retarder of at least 6-mil polyethylene when the space under the home is skirted or enclosed, unless the home is in an arid region with dry soil.","url":"https://terrabrain.vercel.app/repairs/crawl-space-encapsulation#faq-4","section":"repairs","topic":"Crawl space encapsulation"},{"question":"What is Dale soil and how does it affect Oklahoma foundations?","answer":"Dale is a very deep, well-drained silt loam to clay loam on central Oklahoma flood plains, so flood exposure and variable layering are the key questions.","url":"https://terrabrain.vercel.app/soils/dale","section":"soils"},{"question":"Where does Dale soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Dale in central Oklahoma and south-central Kansas, in Major Land Resource Area 80A, the Central Rolling Red Prairies. It is moderately extensive.","url":"https://terrabrain.vercel.app/soils/dale#where-does-dale-soil-occur","section":"soils","topic":"Dale soil"},{"question":"Dale soil: What are its key properties?","answer":"\"Alluvium\" is sediment deposited by flowing water. \"Pachic\" means the dark, organic-rich topsoil is unusually thick.","url":"https://terrabrain.vercel.app/soils/dale#what-are-its-key-properties","section":"soils","topic":"Dale soil"},{"question":"Dale soil: What do its properties mean for foundations?","answer":"The OSD describes Dale as a flood plain soil. Official flood hazard maps for the National Flood Insurance Program are published through FEMA's Flood Map Service Center, which can be searched by address.","url":"https://terrabrain.vercel.app/soils/dale#what-do-its-properties-mean-for-foundations","section":"soils","topic":"Dale soil"},{"question":"Dale soil: How can a specific lot be checked?","answer":"Look up the map unit and its LEP in Web Soil Survey; Search the address in FEMA's Flood Map Service Center; Keep downspout water and sprinklers from ponding next to the foundation.","url":"https://terrabrain.vercel.app/soils/dale#how-can-a-specific-lot-be-checked","section":"soils","topic":"Dale soil"},{"question":"Is Dale soil in a flood plain?","answer":"Dale forms on level to sloping flood plains of alluvial plains in central Oklahoma. Whether a specific property is in a mapped flood hazard area is shown on FEMA flood maps.","url":"https://terrabrain.vercel.app/soils/dale#faq-1","section":"soils","topic":"Dale soil"},{"question":"What is Dale soil made of?","answer":"Dale formed in loamy alluvium, sediment laid down by streams. Its layers are silt loam, loam, silty clay loam or clay loam, with calcium carbonate appearing 20 to 60 inches down.","url":"https://terrabrain.vercel.app/soils/dale#faq-2","section":"soils","topic":"Dale soil"},{"question":"Where is Dale soil found?","answer":"Dale occurs in central Oklahoma and south-central Kansas. Its type location is about 1 mile east of Harrah in Lincoln County, and it was established in Okfuskee County in 1940.","url":"https://terrabrain.vercel.app/soils/dale#faq-3","section":"soils","topic":"Dale soil"},{"question":"Does Dale soil shrink and swell?","answer":"Dale is a fine-silty soil with loamy layers rather than heavy clay. The rated shrink-swell for a specific map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/dale#faq-4","section":"soils","topic":"Dale soil"},{"question":"What is Dalhart soil and how does it affect Oklahoma foundations?","answer":"Dalhart is a deep, well-drained Panhandle soil formed in wind-laid loamy sediment; wetting response and water management are the main foundation questions.","url":"https://terrabrain.vercel.app/soils/dalhart","section":"soils"},{"question":"Where does Dalhart soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Dalhart in the Southern High Plains, Northern Part (Major Land Resource Area 77A) of Kansas, Oklahoma and Texas, and describes the series as extensive.","url":"https://terrabrain.vercel.app/soils/dalhart#where-does-dalhart-soil-occur","section":"soils","topic":"Dalhart soil"},{"question":"Dalhart soil: What are its key properties?","answer":"\"Btk\" marks a subsoil layer that has gained both clay and calcium carbonate (lime). \"Aridic\" signals a dry moisture regime. Dalhart is used mainly for wheat and grain sorghum, with some grazing on native mixed grasses.","url":"https://terrabrain.vercel.app/soils/dalhart#what-are-its-key-properties","section":"soils","topic":"Dalhart soil"},{"question":"Dalhart soil: What do the properties mean for foundations?","answer":"Collapsible soils are unsaturated soils that lose volume when wetted, loaded, or both, and wind-deposited soils such as loess and dune sands are among the deposits where they occur, especially in dry climates.","url":"https://terrabrain.vercel.app/soils/dalhart#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Dalhart soil"},{"question":"Dalhart soil: How do you check a specific lot?","answer":"Look up the map unit and LEP in Web Soil Survey; Route downspouts and irrigation water away from the foundation.","url":"https://terrabrain.vercel.app/soils/dalhart#how-do-you-check-a-specific-lot","section":"soils","topic":"Dalhart soil"},{"question":"Where is Dalhart soil found in Oklahoma?","answer":"Dalhart is mapped on the Southern High Plains of Kansas, Oklahoma and Texas. Its type location is in Cimarron County about 8 miles west of Boise City.","url":"https://terrabrain.vercel.app/soils/dalhart#faq-1","section":"soils","topic":"Dalhart soil"},{"question":"What is Dalhart soil made of?","answer":"Dalhart formed in loamy eolian sediment, meaning material carried and deposited by wind. Its subsoil is sandy clay loam over loam with accumulated calcium carbonate.","url":"https://terrabrain.vercel.app/soils/dalhart#faq-2","section":"soils","topic":"Dalhart soil"},{"question":"Can wind-deposited soils settle when they get wet?","answer":"Some wind-deposited soils have a loose, open structure that can collapse when wetted under load. Whether a particular Dalhart site behaves this way is determined by testing, not by the soil name alone.","url":"https://terrabrain.vercel.app/soils/dalhart#faq-3","section":"soils","topic":"Dalhart soil"},{"question":"How much rain does Dalhart soil get?","answer":"The official description gives a mean annual precipitation of about 18 inches, ranging from 15 to 23 inches.","url":"https://terrabrain.vercel.app/soils/dalhart#faq-4","section":"soils","topic":"Dalhart soil"},{"question":"What is Darnell soil and how does it affect Oklahoma foundations?","answer":"A shallow, sandy, rapidly drained soil over Permian sandstone 10 to 20 inches down; shallow rock, slopes and runoff matter more than clay swelling.","url":"https://terrabrain.vercel.app/soils/darnell","section":"soils"},{"question":"Where does Darnell soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) lists Darnell in Oklahoma, Kansas and Texas within Major Land Resource Area 84A, the Cross Timbers. It is an extensive series found at 740 to 1,315 feet elevation.","url":"https://terrabrain.vercel.app/soils/darnell#where-does-darnell-soil-occur","section":"soils","topic":"Darnell soil"},{"question":"Darnell soil: What are its key properties?","answer":"A \"paralithic contact\" is the boundary with rock that is weathered or only weakly cemented, as opposed to hard rock. The OSD notes that the Cr sandstone has high or very high excavation difficulty, meaning it is hard to dig.","url":"https://terrabrain.vercel.app/soils/darnell#what-are-its-key-properties","section":"soils","topic":"Darnell soil"},{"question":"Darnell soil: What do the properties mean for foundations?","answer":"Clay soils swell when they take on water and shrink when they dry, moving foundations up and down. Darnell's surface and subsoil are sandy loam or fine sandy loam.","url":"https://terrabrain.vercel.app/soils/darnell#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Darnell soil"},{"question":"Darnell soil: How is a specific lot checked?","answer":"Look up the map unit, slope and depth to bedrock in Web Soil Survey; Grade soil to drain away from the foundation and discharge downspouts away from the house; Monitor existing cracks and inspect drainage around the house each year.","url":"https://terrabrain.vercel.app/soils/darnell#how-is-a-specific-lot-checked","section":"soils","topic":"Darnell soil"},{"question":"How deep is the sandstone under Darnell soil?","answer":"Darnell is shallow, with a paralithic contact to sandstone 10 to 20 inches below the surface. The typical profile reaches sandstone at about 15 inches.","url":"https://terrabrain.vercel.app/soils/darnell#faq-1","section":"soils","topic":"Darnell soil"},{"question":"Where is Darnell soil found?","answer":"Darnell occurs in Oklahoma, Kansas and Texas on the Cross Timbers hills. Its type location is about 8 miles west of Tryon in Lincoln County, and it was established in Okfuskee County in 1942.","url":"https://terrabrain.vercel.app/soils/darnell#faq-2","section":"soils","topic":"Darnell soil"},{"question":"Is Darnell soil expansive?","answer":"Darnell is a sandy loam or fine sandy loam with very high permeability, not a clay soil. The rated shrink-swell for a map unit appears as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/darnell#faq-3","section":"soils","topic":"Darnell soil"},{"question":"What grows on Darnell soil?","answer":"Native cover is post oak, blackjack oak and eastern red cedar over tall and mid grasses, and the land is used mainly as rangeland.","url":"https://terrabrain.vercel.app/soils/darnell#faq-4","section":"soils","topic":"Darnell soil"},{"question":"What is Dennis soil and how does it affect Oklahoma foundations?","answer":"Dennis is a deep, somewhat poorly drained clay soil with 28 to 50 percent clay and a perched water table 12 to 30 inches down in winter and spring.","url":"https://terrabrain.vercel.app/soils/dennis","section":"soils"},{"question":"Where does Dennis soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) maps Dennis in southeastern Kansas, southwestern Missouri and eastern Oklahoma, mostly in Major Land Resource Area 112 (the Cherokee Prairies), with smaller areas in MLRA 76 and LRUs 84A, 116A and 118B.","url":"https://terrabrain.vercel.app/soils/dennis#where-does-dennis-soil-occur","section":"soils","topic":"Dennis soil"},{"question":"What are the key properties of Dennis soil?","answer":"\"Argiudolls\" are prairie soils with a dark topsoil and a clay-enriched subsoil in a humid climate; \"Aquic\" marks periodic wetness. Dennis is mainly cropland for small grains, sorghum, soybeans and some cotton, with tame pasture and native tallgrass range.","url":"https://terrabrain.vercel.app/soils/dennis#what-are-the-key-properties-of-dennis-soil","section":"soils","topic":"Dennis soil"},{"question":"Dennis soil: What do these properties mean for foundations?","answer":"A perched water table is a local saturated zone held above the main groundwater by a slowly permeable layer, usually clay. In Dennis it ranges from 12 to 30 inches below the surface from December through April in normal years.","url":"https://terrabrain.vercel.app/soils/dennis#what-do-these-properties-mean-for-foundations","section":"soils","topic":"Dennis soil"},{"question":"What should you know about a Dennis lot?","answer":"Look up the map unit, water table and LEP in Web Soil Survey; Grade soil away from the house and send downspout water well away from the foundation; Water evenly on all sides during dry spells, with extra attention to the sunnier south and west sides.","url":"https://terrabrain.vercel.app/soils/dennis#what-should-you-know-about-a-dennis-lot","section":"soils","topic":"Dennis soil"},{"question":"Where is Dennis soil found?","answer":"Dennis is mapped in eastern Oklahoma, southeastern Kansas and southwestern Missouri, mostly in the Cherokee Prairies. Its type location is about half a mile north of Claremore in Rogers County, and it was established in Wagoner County in 1941.","url":"https://terrabrain.vercel.app/soils/dennis#faq-1","section":"soils","topic":"Dennis soil"},{"question":"Why does Dennis soil stay wet in winter?","answer":"The official description reports a perched seasonal high water table 12 to 30 inches below the surface, typically from December through April. Water sits above the slowly permeable clay subsoil.","url":"https://terrabrain.vercel.app/soils/dennis#faq-2","section":"soils","topic":"Dennis soil"},{"question":"How much clay is in Dennis soil?","answer":"The subsoil is silty clay loam, silty clay or clay with 28 to 50 percent clay, and the particle-size control section averages 37 to 60 percent clay.","url":"https://terrabrain.vercel.app/soils/dennis#faq-3","section":"soils","topic":"Dennis soil"},{"question":"Do Dennis soils move with the seasons?","answer":"Clay soils swell when wet and shrink when dry, which moves shallow foundations. The rated shrink-swell for a Dennis map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/dennis#faq-4","section":"soils","topic":"Dennis soil"},{"question":"What is Dougherty soil and how does it affect Oklahoma foundations?","answer":"Dougherty is a very deep central Oklahoma soil with 20 to 40 inches of loose fine sand over sandy clay loam, so erosion and water management are main concerns.","url":"https://terrabrain.vercel.app/soils/dougherty","section":"soils"},{"question":"Where does Dougherty soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Dougherty in central Oklahoma and Texas, in Major Land Resource Areas 80A and 84A, at 750 to 1,220 feet elevation. It is a series of large extent.","url":"https://terrabrain.vercel.app/soils/dougherty#where-does-dougherty-soil-occur","section":"soils","topic":"Dougherty soil"},{"question":"What are Dougherty soil's key properties?","answer":"\"Arenic\" in the classification refers to the thick sandy layer above the clay-enriched subsoil. The \"E\" horizon is a pale layer from which clay has been washed downward.","url":"https://terrabrain.vercel.app/soils/dougherty#what-are-dougherty-soil-s-key-properties","section":"soils","topic":"Dougherty soil"},{"question":"What does Dougherty soil mean for foundations?","answer":"The upper 20 to 40 inches of Dougherty are fine sand or loamy fine sand, and the typical pedon has 27 inches of sandy material. Washout of sandy soil by concentrated water is covered in erosion, undermining and washout voids.","url":"https://terrabrain.vercel.app/soils/dougherty#what-does-dougherty-soil-mean-for-foundations","section":"soils","topic":"Dougherty soil"},{"question":"Dougherty soil: How do you check a specific lot?","answer":"Look up the map unit, slope and LEP in Web Soil Survey; Check that soil next to the foundation slopes away from the house and has not washed out; Look for gaps or soil pulled away from the foundation and exposed footings.","url":"https://terrabrain.vercel.app/soils/dougherty#how-do-you-check-a-specific-lot","section":"soils","topic":"Dougherty soil"},{"question":"Why is Dougherty soil so sandy?","answer":"Dougherty formed in sandy and loamy Pleistocene terrace sediment reworked into dunes that are now stabilized. Its upper 20 to 40 inches are fine sand or loamy fine sand.","url":"https://terrabrain.vercel.app/soils/dougherty#faq-1","section":"soils","topic":"Dougherty soil"},{"question":"Where is Dougherty soil found?","answer":"Dougherty occurs in central Oklahoma and Texas. Its type location is about 9 miles south and 8 miles west of Stillwater in Payne County, and it was established in Murray County.","url":"https://terrabrain.vercel.app/soils/dougherty#faq-2","section":"soils","topic":"Dougherty soil"},{"question":"Is Dougherty soil expansive?","answer":"Its sandy upper layers hold little clay, and the subsoil has 18 to 35 percent clay. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/dougherty#faq-3","section":"soils","topic":"Dougherty soil"},{"question":"Does Dougherty soil drain well?","answer":"Yes. It is well drained with moderately high saturated hydraulic conductivity.","url":"https://terrabrain.vercel.app/soils/dougherty#faq-4","section":"soils","topic":"Dougherty soil"},{"question":"What is Durant soil and how does it affect Oklahoma foundations?","answer":"Durant is a very deep south-central Oklahoma clay, 40 to 60 percent smectitic, that cracks over 1 cm wide and 30 inches deep when dry, so it shrinks and swells.","url":"https://terrabrain.vercel.app/soils/durant","section":"soils"},{"question":"Where does Durant soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Durant in south-central Oklahoma, in Major Land Resource Area 85, the Grand Prairie of Oklahoma.","url":"https://terrabrain.vercel.app/soils/durant#where-does-durant-soil-occur","section":"soils","topic":"Durant soil"},{"question":"Durant soil: What are its key properties?","answer":"\"Udertic\" means the soil is an intergrade toward the Vertisols, the soil order defined by shrink-swell clay. \"Smectitic\" means smectite is the dominant clay mineral. Durant is used for cotton, small grains, grain sorghum, tame pasture and range.","url":"https://terrabrain.vercel.app/soils/durant#what-are-its-key-properties","section":"soils","topic":"Durant soil"},{"question":"Why does Durant soil move?","answer":"Vertisols are clay-rich soils that shrink as they dry and swell as they rewet, forming deep, wide cracks that open and close, and this shrink-swell action causes serious engineering problems including damage to structures.","url":"https://terrabrain.vercel.app/soils/durant#why-does-durant-soil-move","section":"soils","topic":"Durant soil"},{"question":"What are the practical points for a Durant lot?","answer":"Look up the map unit and LEP in Web Soil Survey; Keep soil moisture next to and under the foundation as uniform as practical; Plant trees farther from the house than their mature height; deep root barriers can help where trees are already close.","url":"https://terrabrain.vercel.app/soils/durant#what-are-the-practical-points-for-a-durant-lot","section":"soils","topic":"Durant soil"},{"question":"Is Durant soil expansive?","answer":"Durant has a clay subsoil with 40 to 60 percent clay, smectitic mineralogy and an Udertic classification, meaning it shows shrink-swell traits approaching those of Vertisols. Its official description reports cracks over 1 cm wide and 30 inches deep in dry periods.","url":"https://terrabrain.vercel.app/soils/durant#faq-1","section":"soils","topic":"Durant soil"},{"question":"Where is Durant soil found?","answer":"Durant occurs in south-central Oklahoma in the Grand Prairie (MLRA 85). Its type location is in Bryan County about 4 miles west and 1 mile north of Albany.","url":"https://terrabrain.vercel.app/soils/durant#faq-2","section":"soils","topic":"Durant soil"},{"question":"How deep is Durant soil?","answer":"Durant is very deep. Some profiles reach shale or claystone below about 64 inches.","url":"https://terrabrain.vercel.app/soils/durant#faq-3","section":"soils","topic":"Durant soil"},{"question":"Why do cracks in a house on Durant soil open and close?","answer":"Clay soils swell when wet and shrink when dry, moving shallow foundations up and down. Cracks that open in dry months and close in wet months are a common result.","url":"https://terrabrain.vercel.app/soils/durant#faq-4","section":"soils","topic":"Durant soil"},{"question":"What is Eram soil and how does it affect Oklahoma foundations?","answer":"Eram is a clayey soil over weathered shale 20 to 40 inches down with a 1 to 2 foot seasonal water table; wet saturation and dry shrinkage affect foundations.","url":"https://terrabrain.vercel.app/soils/eram","section":"soils"},{"question":"Where does Eram soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) maps Eram in Oklahoma, Kansas and Missouri, in Major Land Resource Areas 76, 84A, 112, 118B and 119. It is moderately extensive.","url":"https://terrabrain.vercel.app/soils/eram#where-does-eram-soil-occur","section":"soils","topic":"Eram soil"},{"question":"Eram soil: What are its key properties?","answer":"\"Consistence\" describes how hard or firm a soil feels; \"extremely hard when dry\" is a sign of a dense clay. Eram is mainly rangeland of tall grass prairie, with some cropland and tame pasture.","url":"https://terrabrain.vercel.app/soils/eram#what-are-its-key-properties","section":"soils","topic":"Eram soil"},{"question":"Eram soil: What do the properties mean for foundations?","answer":"Clay soils swell when they gain water and shrink when they dry, and uneven moisture causes more damage than uniform moisture. Eram combines 35 to 55 percent clay with a water table that rises to 1 to 2 feet in winter and spring.","url":"https://terrabrain.vercel.app/soils/eram#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Eram soil"},{"question":"Eram soil: How do you check a specific lot?","answer":"Look up the map unit, depth to bedrock, water table and LEP in Web Soil Survey; Watch for stair-step brick cracks, sticking doors and sloping floors, and track cracks over time.","url":"https://terrabrain.vercel.app/soils/eram#how-do-you-check-a-specific-lot","section":"soils","topic":"Eram soil"},{"question":"How deep is bedrock in Eram soil?","answer":"The official description gives depth to bedrock of 20 to 40 inches. The bedrock is weathered shale or compacted clay beds of Pennsylvanian age with thin sandstone layers.","url":"https://terrabrain.vercel.app/soils/eram#faq-1","section":"soils","topic":"Eram soil"},{"question":"How much clay is in Eram soil?","answer":"Eram's subsoil is clay loam to clay with 35 to 55 percent clay. In the typical profile it is extremely hard when dry and very firm when moist.","url":"https://terrabrain.vercel.app/soils/eram#faq-2","section":"soils","topic":"Eram soil"},{"question":"Does Eram soil have a high water table?","answer":"The official description reports an apparent seasonal high water table 1 to 2 feet below the surface during winter and spring in normal years.","url":"https://terrabrain.vercel.app/soils/eram#faq-3","section":"soils","topic":"Eram soil"},{"question":"Where is Eram soil found?","answer":"Eram occurs in Oklahoma, Kansas and Missouri. Its type location is about 5 miles northeast of Beggs in Okmulgee County, and it was established in Okfuskee County in 1942.","url":"https://terrabrain.vercel.app/soils/eram#faq-4","section":"soils","topic":"Eram soil"},{"question":"What is Foard soil and how does it affect Oklahoma foundations?","answer":"A sodium-affected smectitic clay of southwest Oklahoma with very slow drainage; seasonal shrink-swell and slow drainage drive foundation problems.","url":"https://terrabrain.vercel.app/soils/foard","section":"soils"},{"question":"Where does Foard soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Foard in Oklahoma and Texas, in Major Land Resource Areas 78B and 78C, the Central Rolling Red Plains. It is an extensive series.","url":"https://terrabrain.vercel.app/soils/foard#where-does-foard-soil-occur","section":"soils","topic":"Foard soil"},{"question":"Foard soil: What are its key properties?","answer":"\"Natrustolls\" are prairie soils with a natric horizon, a clay subsoil high in sodium. \"Slickensides\" are polished, grooved surfaces found in shrink-swell clays. Foard is used mainly for small grains and cotton, with some native range.","url":"https://terrabrain.vercel.app/soils/foard#what-are-its-key-properties","section":"soils","topic":"Foard soil"},{"question":"Foard soil: What do the properties mean for foundations?","answer":"The \"Vertic\" part of Foard's name means it meets shrink-swell criteria close to those of the Vertisols: cracks at least 5 mm wide through 30 cm or more within 125 cm of the surface plus a slickenside layer, or a linear extensibility of 6.0 or more to 100 cm.","url":"https://terrabrain.vercel.app/soils/foard#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Foard soil"},{"question":"What practical points apply to a Foard lot?","answer":"Look up the map unit and LEP in Web Soil Survey; Keep soil moisture around the foundation as even as practical, watering more on the drier south and west sides in drought; Grade soil away from the house and repair leaks quickly.","url":"https://terrabrain.vercel.app/soils/foard#what-practical-points-apply-to-a-foard-lot","section":"soils","topic":"Foard soil"},{"question":"What makes Foard soil different from other clay soils?","answer":"Foard combines a smectitic clay subsoil with vertic features such as slickensides and a sodium-affected (natric) horizon. Sodium makes clay particles disperse instead of clumping together, which plugs pores and slows water movement.","url":"https://terrabrain.vercel.app/soils/foard#faq-1","section":"soils","topic":"Foard soil"},{"question":"Where is Foard soil found?","answer":"Foard occurs in Oklahoma and Texas in the Central Rolling Red Plains. Its type location is in Cotton County, Oklahoma, and the series was established in Foard County, Texas.","url":"https://terrabrain.vercel.app/soils/foard#faq-2","section":"soils","topic":"Foard soil"},{"question":"How much clay is in Foard soil?","answer":"The upper clay-enriched layers are silty clay loam, silty clay or clay with 35 to 45 percent clay.","url":"https://terrabrain.vercel.app/soils/foard#faq-3","section":"soils","topic":"Foard soil"},{"question":"Does Foard soil drain?","answer":"The official description classes Foard as well drained, but its permeability is very slow, so water moves through the subsoil very slowly.","url":"https://terrabrain.vercel.app/soils/foard#faq-4","section":"soils","topic":"Foard soil"},{"question":"What is frost heave and can it lift Oklahoma porches and steps?","answer":"Frost heave happens when moist, fine-grained soil freezes and grows ice lenses that push up shallow footings, steps, porches and slabs.","url":"https://terrabrain.vercel.app/causes/frost-heave","section":"causes"},{"question":"How does frost heave work?","answer":"When the ground surface freezes, a freezing front moves downward through the soil.","url":"https://terrabrain.vercel.app/causes/frost-heave#how-does-frost-heave-work","section":"causes","topic":"Frost heave"},{"question":"Which soils heave?","answer":"Differences in soil, moisture and exposure from one spot to the next cause differential heave, which is what does most of the damage to roads and structures.","url":"https://terrabrain.vercel.app/causes/frost-heave#which-soils-heave","section":"causes","topic":"Frost heave"},{"question":"Frost heave: What happens when the ground thaws?","answer":"When thawing works down from the surface, meltwater can be trapped in the upper soil and weaken it.","url":"https://terrabrain.vercel.app/causes/frost-heave#what-happens-when-the-ground-thaws","section":"causes","topic":"Frost heave"},{"question":"How common is frost heave in Oklahoma?","answer":"Oklahoma's climate ranges from humid subtropical in the east to semi-arid in the west.","url":"https://terrabrain.vercel.app/causes/frost-heave#how-common-is-frost-heave-in-oklahoma","section":"causes","topic":"Frost heave"},{"question":"What are the signs of frost heave?","answer":"heaved or settled flatwork, such as sidewalks, porches and stoops that rise in winter; a horizontal crack at the brick ledge or slab edge where a shallow element meets the house.","url":"https://terrabrain.vercel.app/causes/frost-heave#what-are-the-signs-of-frost-heave","section":"causes","topic":"Frost heave"},{"question":"How is frost heave typically addressed?","answer":"Reduce water. Drainage reduces the water available to form ice lenses; see drainage solutions; Use non-frost-susceptible material. Non-frost-susceptible fill helps prevent ice lens formation; Support below the frozen zone.","url":"https://terrabrain.vercel.app/causes/frost-heave#how-is-frost-heave-typically-addressed","section":"causes","topic":"Frost heave"},{"question":"What causes frost heave?","answer":"Frost heave is caused mainly by ice lenses, layers of ice that grow in freezing soil as water is drawn up from unfrozen soil below. It needs freezing temperatures, available water and frost-susceptible soil all at once.","url":"https://terrabrain.vercel.app/causes/frost-heave#faq-1","section":"causes","topic":"Frost heave"},{"question":"Is frost heave just water expanding when it freezes?","answer":"No. Water expands about 9 percent when it freezes, but research going back to Stephen Taber showed that the growth of ice lenses fed by water moving toward the freezing front is the main cause of heave.","url":"https://terrabrain.vercel.app/causes/frost-heave#faq-2","section":"causes","topic":"Frost heave"},{"question":"Which soils heave the most in freezing weather?","answer":"Silts, loams and very fine sands, which allow water to move upward by capillary action, are the most frost-susceptible. Coarse, well-drained sands and gravels rarely heave because their pores are too large for ice lenses to form.","url":"https://terrabrain.vercel.app/causes/frost-heave#faq-3","section":"causes","topic":"Frost heave"},{"question":"Does frost heave go away when the ground thaws?","answer":"Ground lifted by heave can settle back after thawing, but uplift of isolated structures by frost jacking is often permanent and can build up over several winters.","url":"https://terrabrain.vercel.app/causes/frost-heave#faq-4","section":"causes","topic":"Frost heave"},{"question":"What is Grant soil and how does it affect Oklahoma foundations?","answer":"Grant is a deep, well-drained silty soil from Permian siltstone with about 22 to 28 percent clay in the subsoil and weathered rock 40 to 60 inches down.","url":"https://terrabrain.vercel.app/soils/grant","section":"soils"},{"question":"Where does Grant soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Grant in Oklahoma and south-central Kansas, in Major Land Resource Area 80A, the Central Rolling Red Prairies, at 700 to 1,500 feet elevation. It is a series of large extent.","url":"https://terrabrain.vercel.app/soils/grant#where-does-grant-soil-occur","section":"soils","topic":"Grant soil"},{"question":"What are the key properties of Grant soil?","answer":"\"Fine-silty\" means the soil is dominated by silt with a moderate amount of clay. \"Paleoterraces\" are old, high stream terraces left behind as rivers cut down. Grant is mostly cropland for wheat and other small grains, with some native tall and mid grasses.","url":"https://terrabrain.vercel.app/soils/grant#what-are-the-key-properties-of-grant-soil","section":"soils","topic":"Grant soil"},{"question":"Grant soil: What do these properties mean for foundations?","answer":"Clay soils swell when wet and shrink when dry, and uneven moisture causes more damage than uniform changes. Grant's subsoil holds about 22 to 28 percent clay.","url":"https://terrabrain.vercel.app/soils/grant#what-do-these-properties-mean-for-foundations","section":"soils","topic":"Grant soil"},{"question":"Grant soil: How do you check a specific lot?","answer":"Look up the map unit and LEP in Web Soil Survey; Keep soil moisture around the foundation even and have plumbing leaks located and repaired; Track existing cracks and check drainage around the house each year.","url":"https://terrabrain.vercel.app/soils/grant#how-do-you-check-a-specific-lot","section":"soils","topic":"Grant soil"},{"question":"Where is Grant soil found?","answer":"Grant occurs in Oklahoma and south-central Kansas in the Central Rolling Red Prairies. Its type location is in Garfield County about 2 miles north and 6.5 miles west of Hillsdale, and the series was established in Grant County.","url":"https://terrabrain.vercel.app/soils/grant#faq-1","section":"soils","topic":"Grant soil"},{"question":"How deep is the rock under Grant soil?","answer":"Weathered siltstone or silty shale begins 40 to 60 inches below the surface. In the typical profile it starts at 59 inches.","url":"https://terrabrain.vercel.app/soils/grant#faq-2","section":"soils","topic":"Grant soil"},{"question":"Is Grant soil expansive?","answer":"Grant's subsoil is silty clay loam with about 22 to 28 percent clay, a moderate amount. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/grant#faq-3","section":"soils","topic":"Grant soil"},{"question":"What is the loess mantle on some Grant soils?","answer":"Some Grant areas have a thin cap of loess, which is silt carried and deposited by wind, over the weathered siltstone.","url":"https://terrabrain.vercel.app/soils/grant#faq-4","section":"soils","topic":"Grant soil"},{"question":"What is Hector soil and how does it affect Oklahoma foundations?","answer":"Hector is a shallow, stony sandy loam over hard sandstone 14 to 20 inches down. Shallow bedrock, steep slopes and runoff are the main factors for houses.","url":"https://terrabrain.vercel.app/soils/hector","section":"soils"},{"question":"Where does Hector soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) maps Hector in Arkansas, Alabama, Georgia, Kansas, Missouri, Oklahoma and Tennessee, probably on more than 800,000 acres.","url":"https://terrabrain.vercel.app/soils/hector#where-does-hector-soil-occur","section":"soils","topic":"Hector soil"},{"question":"What are Hector soil's key properties?","answer":"\"Lithic\" in the name refers to hard bedrock close to the surface, which the OSD puts at 14 to 20 inches. Hector is mostly low-grade cedar-hardwood forest, and cleared pasture is limited by droughtiness.","url":"https://terrabrain.vercel.app/soils/hector#what-are-hector-soil-s-key-properties","section":"soils","topic":"Hector soil"},{"question":"What does Hector soil mean for foundations?","answer":"Shrink-swell movement comes from clay soils that swell when wet and shrink when dry. Hector's layers are sandy loam to loam with rock fragments. NRCS classes linear extensibility (LEP) under 3 percent as low; the LEP for each Hector map unit appears in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/hector#what-does-hector-soil-mean-for-foundations","section":"soils","topic":"Hector soil"},{"question":"Hector soil: How do you check a specific lot?","answer":"Look up the map unit, slope and depth to bedrock in Web Soil Survey; Inspect drainage near the foundation every year and monitor existing cracks.","url":"https://terrabrain.vercel.app/soils/hector#how-do-you-check-a-specific-lot","section":"soils","topic":"Hector soil"},{"question":"How deep is Hector soil?","answer":"Hector is shallow. The official description gives solum thickness and depth to sandstone bedrock of 14 to 20 inches, with bedrock at 15 inches in the typical profile.","url":"https://terrabrain.vercel.app/soils/hector#faq-1","section":"soils","topic":"Hector soil"},{"question":"Where is Hector soil found?","answer":"Hector is mapped in Oklahoma, Arkansas, Alabama, Georgia, Kansas, Missouri and Tennessee, including the Boston Mountains and Arkansas Valley. Its type location is in Washington County, Arkansas.","url":"https://terrabrain.vercel.app/soils/hector#faq-2","section":"soils","topic":"Hector soil"},{"question":"Is Hector soil expansive?","answer":"Hector is a sandy loam, fine sandy loam or loam with rock fragments, not a clay. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/hector#faq-3","section":"soils","topic":"Hector soil"},{"question":"What grows on Hector soil?","answer":"Most Hector land is low-grade mixed cedar and hardwood forest of cedar, oak, elm, hickory and pine. Cleared areas used for pasture are limited by droughtiness.","url":"https://terrabrain.vercel.app/soils/hector#faq-4","section":"soils","topic":"Hector soil"},{"question":"What is Hennessey shale and how does it affect Oklahoma foundations?","answer":"Red Permian shale west of OKC that weathers into swelling red clay soils, which shrink in drought and swell when wet, driving seasonal foundation movement.","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group","section":"geology"},{"question":"What is Hennessey Group rock?","answer":"The Hennessey is a group, meaning several related rock formations mapped together. It is early Permian in age and named for exposures at Hennessey in Kingfisher County.","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#what-is-hennessey-group-rock","section":"geology","topic":"Hennessey shale red clay"},{"question":"How does the shale behave near the surface?","answer":"The unweathered shale is very tight and nearly impermeable. Near the surface it is different:","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#how-does-the-shale-behave-near-the-surface","section":"geology","topic":"Hennessey shale red clay"},{"question":"What red clay soils form on the Hennessey?","answer":"An Oklahoma State University study measured the coefficient of linear extensibility (COLE), a lab measure of how much a soil shrinks as it dries. It found values up to about 0.090 in a Kirkland-like soil and 0.095 in Bethany, tied to large amounts of smectite clay.","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#what-red-clay-soils-form-on-the-hennessey","section":"geology","topic":"Hennessey shale red clay"},{"question":"Hennessey shale red clay: What does this mean for foundations?","answer":"Because the clay changes volume with moisture, foundations on Hennessey soils commonly show:","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#what-does-this-mean-for-foundations","section":"geology","topic":"Hennessey shale red clay"},{"question":"What is the Hennessey Shale?","answer":"It is a group of early Permian rock layers, mostly red-brown shale with siltstone, some sandstone and thin gypsum beds. It is named for exposures at Hennessey in Kingfisher County and forms the surface across much of western Oklahoma County.","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#faq-1","section":"geology","topic":"Hennessey shale red clay"},{"question":"Why do houses on Hennessey red clay crack?","answer":"The shale weathers into clay soils with a lot of smectite, a swelling clay. Those soils shrink and crack when dry and swell when wet, so the ground under a foundation moves up and down with the seasons.","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#faq-2","section":"geology","topic":"Hennessey shale red clay"},{"question":"How deep does the weathered shale go?","answer":"A central Oklahoma groundwater study describes weathered zones in the shale about 10 to 15 feet deep, fractured by expansion, contraction and leaching. Below that, the shale is very tight.","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#faq-3","section":"geology","topic":"Hennessey shale red clay"},{"question":"Which soils form on the Hennessey?","answer":"Common ones include Renfrow, Kirkland and Bethany. Renfrow formed in weathered Permian clayey shale and has vertic features such as wide cracks and slickensides.","url":"https://terrabrain.vercel.app/geology/hennessey-shale-group#faq-4","section":"geology","topic":"Hennessey shale red clay"},{"question":"What is Hollister soil and how does it affect Oklahoma foundations?","answer":"Hollister is a southwest Oklahoma clay Vertisol, 35 to 55 percent smectitic clay, with cracks deeper than 30 inches, so seasonal movement is the key concern.","url":"https://terrabrain.vercel.app/soils/hollister","section":"soils"},{"question":"Where does Hollister soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Hollister in Texas and Oklahoma, in Major Land Resource Areas 78B and 78C, the Central Rolling Red Plains. It is described as extensive.","url":"https://terrabrain.vercel.app/soils/hollister#where-does-hollister-soil-occur","section":"soils","topic":"Hollister soil"},{"question":"Hollister soil: What are its key properties?","answer":"\"Calcareous\" means the material contains calcium carbonate (lime). Hollister is mainly cropland for wheat, cotton and grain sorghum.","url":"https://terrabrain.vercel.app/soils/hollister#what-are-its-key-properties","section":"soils","topic":"Hollister soil"},{"question":"Why does Hollister soil move?","answer":"Vertisols are clay-rich soils with at least 30 percent clay to 50 cm; they shrink as they dry and swell as they rewet, opening deep, wide cracks and forming slickensides, the polished, grooved surfaces found in these clays.","url":"https://terrabrain.vercel.app/soils/hollister#why-does-hollister-soil-move","section":"soils","topic":"Hollister soil"},{"question":"What are the practical points for a Hollister lot?","answer":"Look up the map unit and LEP in Web Soil Survey; Keep soil moisture uniform around and under the foundation; Plant trees farther from the house than their mature height.","url":"https://terrabrain.vercel.app/soils/hollister#what-are-the-practical-points-for-a-hollister-lot","section":"soils","topic":"Hollister soil"},{"question":"Hollister soil: What is a Vertisol?","answer":"A Vertisol is a clay-rich soil that shrinks and cracks deeply as it dries and swells as it rewets. Hollister is classified as a Vertisol (Typic Haplusterts).","url":"https://terrabrain.vercel.app/soils/hollister#faq-1","section":"soils","topic":"Hollister soil"},{"question":"How much does Hollister soil crack?","answer":"The official description reports cracks extending deeper than 30 inches that stay open for 150 or more cumulative days in most years.","url":"https://terrabrain.vercel.app/soils/hollister#faq-2","section":"soils","topic":"Hollister soil"},{"question":"Where is Hollister soil found?","answer":"Hollister occurs in Texas and Oklahoma in the Central Rolling Red Plains. Its type location is in Hardeman County, Texas, near Chillicothe.","url":"https://terrabrain.vercel.app/soils/hollister#faq-3","section":"soils","topic":"Hollister soil"},{"question":"How much clay is in Hollister soil?","answer":"The subsoil layers hold 35 to 55 percent clay, and the surface layer holds 32 to 40 percent.","url":"https://terrabrain.vercel.app/soils/hollister#faq-4","section":"soils","topic":"Hollister soil"},{"question":"What is Kingfisher soil and how does it affect Oklahoma foundations?","answer":"Kingfisher is a well-drained silty clay loam with 27 to 42 percent clay over weathered red-bed rock 20 to 40 inches down.","url":"https://terrabrain.vercel.app/soils/kingfisher","section":"soils"},{"question":"Where does Kingfisher soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) Official Series Description (OSD) places Kingfisher in Oklahoma and probably south-central Kansas, in Major Land Resource Area 80A, the Central Rolling Red Prairies. It is of moderate extent.","url":"https://terrabrain.vercel.app/soils/kingfisher#where-does-kingfisher-soil-occur","section":"soils","topic":"Kingfisher soil"},{"question":"Kingfisher soil: What are its key properties?","answer":"\"Argiustolls\" are prairie soils with a dark topsoil over a clay-enriched subsoil. Kingfisher is mainly cropland, especially winter wheat, and native vegetation was tallgrass prairie.","url":"https://terrabrain.vercel.app/soils/kingfisher#what-are-its-key-properties","section":"soils","topic":"Kingfisher soil"},{"question":"Kingfisher soil: What do the properties mean for foundations?","answer":"Clay soils swell (heave) when they gain water and shrink (settle) when they dry, and uneven moisture causes more damage than uniform moisture. Kingfisher's clay rises from 27 to 35 percent in the upper subsoil to as much as 42 percent lower down.","url":"https://terrabrain.vercel.app/soils/kingfisher#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Kingfisher soil"},{"question":"What should you know about a Kingfisher lot?","answer":"Look up the map unit, depth to bedrock and LEP in Web Soil Survey; Keep soil moisture next to the foundation as even as practical, and grade soil away from the house; Repair leaks quickly and track existing cracks over time.","url":"https://terrabrain.vercel.app/soils/kingfisher#what-should-you-know-about-a-kingfisher-lot","section":"soils","topic":"Kingfisher soil"},{"question":"How deep is rock under Kingfisher soil?","answer":"Weathered bedrock of interbedded siltstone, shale and sandstone begins 20 to 40 inches below the surface. In the typical profile it starts at 38 inches.","url":"https://terrabrain.vercel.app/soils/kingfisher#faq-1","section":"soils","topic":"Kingfisher soil"},{"question":"How much clay is in Kingfisher soil?","answer":"The subsoil is silty clay loam or clay loam with 27 to 35 percent clay in the upper part and up to 42 percent in the lower part.","url":"https://terrabrain.vercel.app/soils/kingfisher#faq-2","section":"soils","topic":"Kingfisher soil"},{"question":"Where is Kingfisher soil found?","answer":"Kingfisher occurs in Oklahoma and probably south-central Kansas in the Central Rolling Red Prairies. Its type location is about 1 mile west and 5 miles south of the town of Kingfisher.","url":"https://terrabrain.vercel.app/soils/kingfisher#faq-3","section":"soils","topic":"Kingfisher soil"},{"question":"Does Kingfisher soil shrink and swell?","answer":"Clay soils swell when wet and shrink when dry, and Kingfisher's subsoil has a moderate to fairly high clay content. The rated value for each map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/kingfisher#faq-4","section":"soils","topic":"Kingfisher soil"},{"question":"What is Kiomatia soil and how does it affect Oklahoma foundations?","answer":"A deep, sandy Red River floodplain soil that floods often and has a seasonal water table at 42 to 60 inches; water, not clay swell, drives concerns.","url":"https://terrabrain.vercel.app/soils/kiomatia","section":"soils"},{"question":"What is Kiomatia soil?","answer":"Kiomatia is a soil series described by the USDA Natural Resources Conservation Service (NRCS). Its taxonomic class is \"Sandy, mixed, thermic Typic Udifluvents\". \"Sandy\" describes the texture of its control section.","url":"https://terrabrain.vercel.app/soils/kiomatia#what-is-kiomatia-soil","section":"soils","topic":"Kiomatia soil"},{"question":"What is the typical soil profile?","answer":"The official description gives this typical profile:","url":"https://terrabrain.vercel.app/soils/kiomatia#what-is-the-typical-soil-profile","section":"soils","topic":"Kiomatia soil"},{"question":"Kiomatia soil: What does it mean for foundations?","answer":"Shrink-swell soils are clays that grow and shrink as their moisture changes. Soil scientists measure this as linear extensibility, the linear expression of the change in volume between moist and oven-dry soil, with less than 3 percent rated \"low\".","url":"https://terrabrain.vercel.app/soils/kiomatia#what-does-it-mean-for-foundations","section":"soils","topic":"Kiomatia soil"},{"question":"How is the soil at a property confirmed?","answer":"Web Soil Survey shows the mapped soil units for an area and lets users judge soil suitability for a particular use; Check the FEMA Flood Map Service Center for the Flood Insurance Rate Map panel covering the address; A site-specific soil boring is the way to confirm actual layers and water levels; see soil testing and lab values.","url":"https://terrabrain.vercel.app/soils/kiomatia#how-is-the-soil-at-a-property-confirmed","section":"soils","topic":"Kiomatia soil"},{"question":"Is Kiomatia soil expansive clay?","answer":"No. The official description lists only 5 to 18 percent clay in the control section, with sandy, layered material through the profile. Shrink-swell from clay is not the main concern on this soil.","url":"https://terrabrain.vercel.app/soils/kiomatia#faq-1","section":"soils","topic":"Kiomatia soil"},{"question":"Does Kiomatia soil flood?","answer":"Yes. The USDA description says it is frequently flooded for brief periods in most years where it is not protected by levees or other works.","url":"https://terrabrain.vercel.app/soils/kiomatia#faq-2","section":"soils","topic":"Kiomatia soil"},{"question":"How deep is the water table in Kiomatia soil?","answer":"The official description puts the water table at about 42 to 60 inches below the surface, usually from January through July in most years.","url":"https://terrabrain.vercel.app/soils/kiomatia#faq-3","section":"soils","topic":"Kiomatia soil"},{"question":"How do I know if my lot is mapped as Kiomatia?","answer":"Look up the address in the USDA Web Soil Survey, which shows the mapped soil units and their properties. Check the FEMA Flood Map Service Center for the official flood zone.","url":"https://terrabrain.vercel.app/soils/kiomatia#faq-4","section":"soils","topic":"Kiomatia soil"},{"question":"What is Kirkland soil and how does it affect Oklahoma foundations?","answer":"Kirkland is a deep central Oklahoma terrace soil with a dense clay subsoil of 35 to 60 percent clay, so homes on it are exposed to seasonal shrink-swell movement.","url":"https://terrabrain.vercel.app/soils/kirkland","section":"soils"},{"question":"What is Kirkland soil?","answer":"Kirkland is an official USDA soil series classified as \"Fine, mixed, superactive, thermic Udertic Paleustolls\". The word \"Udertic\" marks a vertic intergrade, a soil that trends toward the Vertisols, the order of clay soils defined by shrink-swell behavior.","url":"https://terrabrain.vercel.app/soils/kirkland#what-is-kirkland-soil","section":"soils","topic":"Kirkland soil"},{"question":"What does a Kirkland soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/kirkland#what-does-a-kirkland-soil-profile-look-like","section":"soils","topic":"Kirkland soil"},{"question":"What does Kirkland soil mean for foundations?","answer":"Clay soils swell (heave) as they gain water and shrink (settle) as they dry. Uniform changes in soil moisture are less damaging than localized changes.","url":"https://terrabrain.vercel.app/soils/kirkland#what-does-kirkland-soil-mean-for-foundations","section":"soils","topic":"Kirkland soil"},{"question":"Is Kirkland soil expansive?","answer":"Its subsoil has 35 to 60 percent clay and slickensides, polished faces that form when clay repeatedly swells and shrinks. It is classified in an Udertic subgroup, meaning it trends toward the strongly shrink-swell Vertisols.","url":"https://terrabrain.vercel.app/soils/kirkland#faq-1","section":"soils","topic":"Kirkland soil"},{"question":"Where is Kirkland soil found?","answer":"The official description lists central Oklahoma and south-central Kansas. The type location is in Logan County, Oklahoma, west of Guthrie.","url":"https://terrabrain.vercel.app/soils/kirkland#faq-2","section":"soils","topic":"Kirkland soil"},{"question":"How deep is rock under Kirkland soil?","answer":"In the typical profile, weakly cemented siltstone begins at about 82 inches. The soil above it is mostly silty clay.","url":"https://terrabrain.vercel.app/soils/kirkland#faq-3","section":"soils","topic":"Kirkland soil"},{"question":"Why does a house on Kirkland soil move with the seasons?","answer":"Clay soils swell as they gain water and shrink as they dry. When moisture changes unevenly around a shallow foundation, parts of the house rise or settle relative to others.","url":"https://terrabrain.vercel.app/soils/kirkland#faq-4","section":"soils","topic":"Kirkland soil"},{"question":"What is Konawa soil and how does it affect Oklahoma foundations?","answer":"Konawa is a deep sandy terrace soil of the Cross Timbers with an 18-30% clay subsoil. Its foundation issues more often trace to water, drainage and fill.","url":"https://terrabrain.vercel.app/soils/konawa","section":"soils"},{"question":"What is Konawa soil?","answer":"Konawa is an official USDA soil series classified as \"Fine-loamy, mixed, active, thermic Ultic Haplustalfs\". \"Fine-loamy\" refers to the texture of its subsoil, which is fine sandy loam or sandy clay loam.","url":"https://terrabrain.vercel.app/soils/konawa#what-is-konawa-soil","section":"soils","topic":"Konawa soil"},{"question":"What does a Konawa soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/konawa#what-does-a-konawa-soil-profile-look-like","section":"soils","topic":"Konawa soil"},{"question":"What does Konawa soil mean for foundations?","answer":"Shrink-swell soils change volume as moisture changes, and the USDA measures this as linear extensibility: under 3 percent is low and 3 to 6 percent is moderate. Konawa's subsoil clay content is 18 to 30 percent; compare higher-clay central Oklahoma claypan soils such as Kirkland.","url":"https://terrabrain.vercel.app/soils/konawa#what-does-konawa-soil-mean-for-foundations","section":"soils","topic":"Konawa soil"},{"question":"How do you confirm the soil at a property?","answer":"Web Soil Survey shows the mapped soil units for an area, covering more than 95 percent of U.S. counties, and can generate custom soil reports.","url":"https://terrabrain.vercel.app/soils/konawa#how-do-you-confirm-the-soil-at-a-property","section":"soils","topic":"Konawa soil"},{"question":"Is Konawa soil expansive clay?","answer":"Konawa's subsoil is fine sandy loam or sandy clay loam with 18 to 30 percent clay, and its surface layers are sand to fine sandy loam. It is a loamy soil, not a high-clay expansive soil, but the exact shrink-swell rating for a mapped area is listed in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/konawa#faq-1","section":"soils","topic":"Konawa soil"},{"question":"Where is Konawa soil found in Oklahoma?","answer":"It occurs in the North Cross Timbers region of Oklahoma, Kansas and Texas. Its type location is in Payne County near Perkins, and the series was established in Pottawatomie County.","url":"https://terrabrain.vercel.app/soils/konawa#faq-2","section":"soils","topic":"Konawa soil"},{"question":"How deep is bedrock under Konawa soil?","answer":"The official description puts bedrock deeper than 80 inches.","url":"https://terrabrain.vercel.app/soils/konawa#faq-3","section":"soils","topic":"Konawa soil"},{"question":"What did Konawa land look like before development?","answer":"Native vegetation was post oak, blackjack oak and hickory with grass underneath, the typical Cross Timbers forest.","url":"https://terrabrain.vercel.app/soils/konawa#faq-4","section":"soils","topic":"Konawa soil"},{"question":"What is Lucien soil and how does it affect Oklahoma foundations?","answer":"Lucien is a shallow loamy soil on central Oklahoma hilltops with weathered Permian sandstone 10 to 20 inches down; shallow rock and water flow matter most.","url":"https://terrabrain.vercel.app/soils/lucien","section":"soils"},{"question":"What is Lucien soil?","answer":"Lucien is an official USDA soil series classified as \"Loamy, mixed, superactive, thermic, shallow Udic Haplustolls\". \"Shallow\" in the name refers to its limited depth to rock.","url":"https://terrabrain.vercel.app/soils/lucien#what-is-lucien-soil","section":"soils","topic":"Lucien soil"},{"question":"What is its typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/lucien#what-is-its-typical-soil-profile","section":"soils","topic":"Lucien soil"},{"question":"Lucien soil: What does it mean for foundations?","answer":"A paralithic contact is the boundary between soil and soft bedrock that is very weakly to moderately coherent. Paralithic material can be dug with hand tools, with some difficulty.","url":"https://terrabrain.vercel.app/soils/lucien#what-does-it-mean-for-foundations","section":"soils","topic":"Lucien soil"},{"question":"How can the soil at a property be confirmed?","answer":"Web Soil Survey shows mapped soil units and soil data for more than 95 percent of U.S. counties. Actual rock depth at a house is confirmed by a boring or by pier installation records.","url":"https://terrabrain.vercel.app/soils/lucien#how-can-the-soil-at-a-property-be-confirmed","section":"soils","topic":"Lucien soil"},{"question":"How deep is rock in Lucien soil?","answer":"The official description puts soil depth at 10 to 20 inches over weathered sandstone, with the rock contact at about 14 inches in the typical profile.","url":"https://terrabrain.vercel.app/soils/lucien#faq-1","section":"soils","topic":"Lucien soil"},{"question":"Is Lucien soil expansive?","answer":"Lucien is a loamy soil (loam to very fine sandy loam) with no clay-enriched subsoil. It is not described as a clay soil, though interbedded clay or shale can occur in the rock below.","url":"https://terrabrain.vercel.app/soils/lucien#faq-2","section":"soils","topic":"Lucien soil"},{"question":"Where is Lucien soil found?","answer":"On summits and shoulders of low hills in the Central Rolling Red Prairies of Oklahoma, Kansas and Texas. Its type location is in Noble County, Oklahoma, near Perry.","url":"https://terrabrain.vercel.app/soils/lucien#faq-3","section":"soils","topic":"Lucien soil"},{"question":"Is the rock under Lucien soil hard?","answer":"It is described as weathered sandstone at a paralithic contact. Paralithic material is soft, weakly consolidated rock that can be dug with hand tools, with some difficulty.","url":"https://terrabrain.vercel.app/soils/lucien#faq-4","section":"soils","topic":"Lucien soil"},{"question":"What is Muskogee soil and how does it affect Oklahoma foundations?","answer":"Muskogee is a deep terrace soil with silt loam over silty clay and firm clay; its slow permeability makes water management the central foundation issue.","url":"https://terrabrain.vercel.app/soils/muskogee","section":"soils"},{"question":"What is Muskogee soil?","answer":"Muskogee is an official USDA soil series classified as \"Fine-silty, mixed, active, thermic Aquic Paleudalfs\". \"Aquic\" in a soil name signals periodic saturation and the reduced (oxygen-poor) conditions that come with it.","url":"https://terrabrain.vercel.app/soils/muskogee#what-is-muskogee-soil","section":"soils","topic":"Muskogee soil"},{"question":"What is the typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/muskogee#what-is-the-typical-soil-profile","section":"soils","topic":"Muskogee soil"},{"question":"What does Muskogee soil mean for foundations?","answer":"The upper 14 inches of Muskogee are silt loam, while the subsoil becomes silty clay at about 26 inches and clay at about 46 inches. Clayey soils swell as they gain water and shrink as they dry, so the clay lower subsoil is the part most likely to change volume.","url":"https://terrabrain.vercel.app/soils/muskogee#what-does-muskogee-soil-mean-for-foundations","section":"soils","topic":"Muskogee soil"},{"question":"How do you confirm the soil at a property?","answer":"Web Soil Survey shows mapped soil units and lets users generate custom soil reports.","url":"https://terrabrain.vercel.app/soils/muskogee#how-do-you-confirm-the-soil-at-a-property","section":"soils","topic":"Muskogee soil"},{"question":"What is Muskogee soil like?","answer":"It has about 14 inches of silt loam over a subsoil that grades from silty clay loam to silty clay and then clay with depth. Water moves through it slowly.","url":"https://terrabrain.vercel.app/soils/muskogee#faq-1","section":"soils","topic":"Muskogee soil"},{"question":"Is Muskogee soil named after Muskogee, Oklahoma?","answer":"The series was established in Muskogee County, Oklahoma, in 1913. Its current type location is in Franklin County, Arkansas.","url":"https://terrabrain.vercel.app/soils/muskogee#faq-2","section":"soils","topic":"Muskogee soil"},{"question":"Does Muskogee soil stay wet?","answer":"It is moderately well drained with slow permeability, and its classification includes 'Aquic', which in soil taxonomy indicates periods of saturation. The official description does not give a water-table depth.","url":"https://terrabrain.vercel.app/soils/muskogee#faq-3","section":"soils","topic":"Muskogee soil"},{"question":"Is Muskogee soil expansive?","answer":"Its lower subsoil is clay that is very firm and sticky. The official description does not give a shrink-swell value; the rating for a mapped area is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/muskogee#faq-4","section":"soils","topic":"Muskogee soil"},{"question":"What is Niotaze soil and how does it affect Oklahoma foundations?","answer":"A somewhat poorly drained hillside soil with a smectitic clay subsoil over shale at 20 to 40 inches, so homes can face clay movement and wet soil.","url":"https://terrabrain.vercel.app/soils/niotaze","section":"soils"},{"question":"What is Niotaze soil?","answer":"Niotaze is an official USDA soil series classified as \"Fine, smectitic, thermic Albaquic Hapludalfs\".","url":"https://terrabrain.vercel.app/soils/niotaze#what-is-niotaze-soil","section":"soils","topic":"Niotaze soil"},{"question":"What is the typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/niotaze#what-is-the-typical-soil-profile","section":"soils","topic":"Niotaze soil"},{"question":"Niotaze soil: What does it mean for foundations?","answer":"Clay soils swell as they gain water and shrink as they dry, and uneven moisture change under a shallow foundation causes uneven movement.","url":"https://terrabrain.vercel.app/soils/niotaze#what-does-it-mean-for-foundations","section":"soils","topic":"Niotaze soil"},{"question":"How much Niotaze soil is in Oklahoma?","answer":"The official description puts the series at about 350,000 acres, roughly 300,000 of them in north-central and northeastern Oklahoma and the rest in southeast Kansas.","url":"https://terrabrain.vercel.app/soils/niotaze#faq-1","section":"soils","topic":"Niotaze soil"},{"question":"How deep is shale under Niotaze soil?","answer":"Shale is reached at 20 to 40 inches. In the typical profile it begins at about 28 inches.","url":"https://terrabrain.vercel.app/soils/niotaze#faq-2","section":"soils","topic":"Niotaze soil"},{"question":"Why does Niotaze soil stay wet?","answer":"It is somewhat poorly drained with slow permeability, and clay content jumps sharply from the sandy surface into the clay subsoil. That kind of abrupt change significantly restricts water movement.","url":"https://terrabrain.vercel.app/soils/niotaze#faq-3","section":"soils","topic":"Niotaze soil"},{"question":"Is Niotaze soil expansive?","answer":"Its subsoil has 35 to 55 percent clay, and the series is classed as smectitic, the clay group associated with expansive soils, although some sampled profiles are mixed mineralogy.","url":"https://terrabrain.vercel.app/soils/niotaze#faq-4","section":"soils","topic":"Niotaze soil"},{"question":"What is Nixa soil and how does it affect Oklahoma foundations?","answer":"Nixa is a very gravelly, cherty Ozark soil with a dense fragipan 14 to 27 inches down that perches water and speeds runoff on slopes.","url":"https://terrabrain.vercel.app/soils/nixa","section":"soils"},{"question":"What is Nixa soil?","answer":"Nixa is an official USDA soil series classified as \"Loamy-skeletal, siliceous, active, mesic Glossic Fragiudults\". \"Loamy-skeletal\" reflects its high rock-fragment content, and \"Fragi\" refers to its fragipan.","url":"https://terrabrain.vercel.app/soils/nixa#what-is-nixa-soil","section":"soils","topic":"Nixa soil"},{"question":"What does a Nixa soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/nixa#what-does-a-nixa-soil-profile-look-like","section":"soils","topic":"Nixa soil"},{"question":"What does Nixa soil mean for foundations?","answer":"Fragic soil material is firm and brittle when moist, is not cemented (dry pieces break apart in water) and restricts roots. Nixa's fragipan is part of why its permeability is very slow.","url":"https://terrabrain.vercel.app/soils/nixa#what-does-nixa-soil-mean-for-foundations","section":"soils","topic":"Nixa soil"},{"question":"How do you confirm the soil at a property?","answer":"Web Soil Survey covers more than 95 percent of U.S. counties and can produce custom soil reports.","url":"https://terrabrain.vercel.app/soils/nixa#how-do-you-confirm-the-soil-at-a-property","section":"soils","topic":"Nixa soil"},{"question":"What is a fragipan in Nixa soil?","answer":"A fragipan is a dense, brittle subsoil layer that restricts roots and water. In Nixa it starts 14 to 27 inches below the surface.","url":"https://terrabrain.vercel.app/soils/nixa#faq-1","section":"soils","topic":"Nixa soil"},{"question":"Why is Nixa soil so rocky?","answer":"It formed from colluvium and residuum of cherty limestone. Chert fragments make up roughly 35 to 85 percent of the subsoil by volume.","url":"https://terrabrain.vercel.app/soils/nixa#faq-2","section":"soils","topic":"Nixa soil"},{"question":"Is Nixa soil expansive?","answer":"Nixa's subsoil is mostly chert fragments with silt loam between them; only the deepest layer has clayey fine earth. The official description gives no shrink-swell value, so check Web Soil Survey for the mapped rating.","url":"https://terrabrain.vercel.app/soils/nixa#faq-3","section":"soils","topic":"Nixa soil"},{"question":"Where is Nixa soil found?","answer":"On ridgetops and side slopes of the Ozark Highlands in Arkansas, Kansas, Kentucky, Missouri, Oklahoma, Tennessee and Virginia.","url":"https://terrabrain.vercel.app/soils/nixa#faq-4","section":"soils","topic":"Nixa soil"},{"question":"What is Norge soil and how does it affect Oklahoma foundations?","answer":"Norge is a deep, well-drained silt loam over reddish silty clay loam in central Oklahoma. It is less clayey than nearby soils, so drainage and fill matter.","url":"https://terrabrain.vercel.app/soils/norge","section":"soils"},{"question":"What is Norge soil?","answer":"Norge is an official USDA soil series classified as \"Fine-silty, mixed, active, thermic Udic Paleustolls\". \"Fine-silty\" is its particle-size family; in Norge the subsoil is silty clay loam throughout.","url":"https://terrabrain.vercel.app/soils/norge#what-is-norge-soil","section":"soils","topic":"Norge soil"},{"question":"What does a Norge soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/norge#what-does-a-norge-soil-profile-look-like","section":"soils","topic":"Norge soil"},{"question":"What does Norge soil mean for foundations?","answer":"The USDA rates shrink-swell as linear extensibility, a linear expression of the volume change between moist soil and oven dryness: under 3 percent is low, 3 to 6 percent moderate, 6 to 9 percent high and 9 percent or more very high.","url":"https://terrabrain.vercel.app/soils/norge#what-does-norge-soil-mean-for-foundations","section":"soils","topic":"Norge soil"},{"question":"How do you confirm the soil at a property?","answer":"Web Soil Survey shows the mapped soil unit for an address and lets users create custom reports.","url":"https://terrabrain.vercel.app/soils/norge#how-do-you-confirm-the-soil-at-a-property","section":"soils","topic":"Norge soil"},{"question":"What is Norge soil like?","answer":"It has about a foot of brown silt loam over a reddish to red silty clay loam subsoil that continues past 5 feet. It is well drained with moderately slow permeability.","url":"https://terrabrain.vercel.app/soils/norge#faq-1","section":"soils","topic":"Norge soil"},{"question":"Where is Norge soil found?","answer":"In the Central Rolling Red Prairies of Oklahoma. The type location is in Pawnee County, and the series was established in Grady County in 1942.","url":"https://terrabrain.vercel.app/soils/norge#faq-2","section":"soils","topic":"Norge soil"},{"question":"Is Norge soil expansive?","answer":"Its subsoil is silty clay loam rather than clay, and the official description lists it as fine-silty. The rated shrink-swell value for each mapped area is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/norge#faq-3","section":"soils","topic":"Norge soil"},{"question":"How is Norge different from Kirkland or Renfrow?","answer":"The official description notes that Bethany, Kirkland and Renfrow have a finer (more clayey) control section than Norge.","url":"https://terrabrain.vercel.app/soils/norge#faq-4","section":"soils","topic":"Norge soil"},{"question":"What is Okemah soil and how does it affect Oklahoma foundations?","answer":"Okemah is a deep eastern Oklahoma prairie soil with a shrink-swell silty clay subsoil and a perched water table 2 to 3 feet down in winter and spring.","url":"https://terrabrain.vercel.app/soils/okemah","section":"soils"},{"question":"What is Okemah soil?","answer":"Okemah is an official USDA soil series classified as \"Fine, mixed, active, thermic Aquic Paleudolls\". \"Aquic\" in a soil name indicates periodic saturation and the oxygen-poor conditions that come with it.","url":"https://terrabrain.vercel.app/soils/okemah#what-is-okemah-soil","section":"soils","topic":"Okemah soil"},{"question":"What is its typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/okemah#what-is-its-typical-soil-profile","section":"soils","topic":"Okemah soil"},{"question":"Okemah soil: What does it mean for foundations?","answer":"Slickensides are polished, grooved surfaces formed by repeated shrinking and swelling of clay. Okemah's upper subsoil has a few slickensides, and its subsoil is silty clay to clay.","url":"https://terrabrain.vercel.app/soils/okemah#what-does-it-mean-for-foundations","section":"soils","topic":"Okemah soil"},{"question":"How can the soil at a property be confirmed?","answer":"Web Soil Survey shows mapped soil units and soil data for an area and can generate custom reports. The water table described for Okemah is seasonal, present from December to April in normal years, so the time of year matters when water levels are checked on site.","url":"https://terrabrain.vercel.app/soils/okemah#how-can-the-soil-at-a-property-be-confirmed","section":"soils","topic":"Okemah soil"},{"question":"Does Okemah soil have a high water table?","answer":"Yes. The official description lists a perched seasonal high water table 2 to 3 feet below the surface from December to April in normal years.","url":"https://terrabrain.vercel.app/soils/okemah#faq-1","section":"soils","topic":"Okemah soil"},{"question":"Is Okemah soil expansive?","answer":"Its subsoil is silty clay from about 21 inches down, with a few slickensides, polished faces that form as clay shrinks and swells. The rated shrink-swell value for each mapped area is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/okemah#faq-2","section":"soils","topic":"Okemah soil"},{"question":"Where is Okemah soil found?","answer":"On broad high terraces and lower upland slopes in eastern Oklahoma and southeastern Kansas. The type location is in Okmulgee County near Beggs.","url":"https://terrabrain.vercel.app/soils/okemah#faq-3","section":"soils","topic":"Okemah soil"},{"question":"Okemah soil: What does a perched water table mean for a house?","answer":"It means a saturated zone sits on top of drier soil below, a condition soil scientists call episaturation. On Okemah it occurs 2 to 3 feet down in winter and spring.","url":"https://terrabrain.vercel.app/soils/okemah#faq-4","section":"soils","topic":"Okemah soil"},{"question":"What is Osage soil and how does it affect Oklahoma foundations?","answer":"Osage is a poorly drained floodplain Vertisol with 40-65% clay and a water table 6-18 inches down in winter and spring, so clay movement and wetness combine.","url":"https://terrabrain.vercel.app/soils/osage","section":"soils"},{"question":"What is Osage soil?","answer":"Osage is an official USDA soil series classified as \"Fine, smectitic, thermic Typic Epiaquerts\". The \"-ert\" ending places it in the Vertisols, clay-rich soils that shrink and form deep, wide cracks when dry and expand when wet. That movement creates serious engineering problems.","url":"https://terrabrain.vercel.app/soils/osage#what-is-osage-soil","section":"soils","topic":"Osage soil"},{"question":"What is the typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/osage#what-is-the-typical-soil-profile","section":"soils","topic":"Osage soil"},{"question":"What does Osage soil mean for foundations?","answer":"Slickensides, polished and grooved surfaces formed by repeated shrinking and swelling, are one of the diagnostic features of Vertisols. Osage has continuous, intersecting slickensides from about 13 to 60 inches.","url":"https://terrabrain.vercel.app/soils/osage#what-does-osage-soil-mean-for-foundations","section":"soils","topic":"Osage soil"},{"question":"Is Osage soil expansive?","answer":"Yes. Osage is a Vertisol, the soil order defined by clay that shrinks and cracks when dry and swells when wet. Its subsoil is 40 to 65 percent clay with intersecting slickensides from about 13 to 60 inches.","url":"https://terrabrain.vercel.app/soils/osage#faq-1","section":"soils","topic":"Osage soil"},{"question":"How high is the water table in Osage soil?","answer":"The official description lists an apparent seasonal high water table 6 to 18 inches below the surface from November through May in normal years.","url":"https://terrabrain.vercel.app/soils/osage#faq-2","section":"soils","topic":"Osage soil"},{"question":"Where is Osage soil found?","answer":"On flood plains along major streams in eastern Oklahoma, southeastern Kansas and southwestern Missouri.","url":"https://terrabrain.vercel.app/soils/osage#faq-3","section":"soils","topic":"Osage soil"},{"question":"How can I check flood risk on Osage soil?","answer":"Osage forms on flood plains. The official flood zone for an address comes from FEMA's Flood Map Service Center, which can be searched by address.","url":"https://terrabrain.vercel.app/soils/osage#faq-4","section":"soils","topic":"Osage soil"},{"question":"What is Parsons soil and how does it affect Oklahoma foundations?","answer":"A claypan soil with about a foot of silt loam on dense clay; water perches 6 to 18 inches down in winter and spring, and the clay can change volume.","url":"https://terrabrain.vercel.app/soils/parsons","section":"soils"},{"question":"What is Parsons soil?","answer":"Parsons is an official USDA soil series classified as \"Fine, mixed, active, thermic Mollic Albaqualfs\". The \"aqu\" in its name points to aquic conditions, which in soil science means periodic saturation and reduction.","url":"https://terrabrain.vercel.app/soils/parsons#what-is-parsons-soil","section":"soils","topic":"Parsons soil"},{"question":"What is the typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/parsons#what-is-the-typical-soil-profile","section":"soils","topic":"Parsons soil"},{"question":"Parsons soil: What does it mean for foundations?","answer":"An abrupt textural change is a sharp increase in clay over a very short distance, and it significantly restricts water movement. Parsons has this change at the top of its clay subsoil.","url":"https://terrabrain.vercel.app/soils/parsons#what-does-it-mean-for-foundations","section":"soils","topic":"Parsons soil"},{"question":"What is a claypan in Parsons soil?","answer":"It is the dense clay subsoil that starts abruptly, at about 12 inches in the typical profile, directly beneath the silty surface. Clay content in that layer is 35 to 60 percent.","url":"https://terrabrain.vercel.app/soils/parsons#faq-1","section":"soils","topic":"Parsons soil"},{"question":"Does Parsons soil stay wet?","answer":"Yes. The official description lists a perched seasonal water table 6 to 18 inches below the surface, typically from December through April.","url":"https://terrabrain.vercel.app/soils/parsons#faq-2","section":"soils","topic":"Parsons soil"},{"question":"Where is Parsons soil found?","answer":"On plains, divides and old terraces in eastern Oklahoma, southeastern Kansas, southwestern Missouri and northwestern Arkansas. The type location is near Wagoner, Oklahoma.","url":"https://terrabrain.vercel.app/soils/parsons#faq-3","section":"soils","topic":"Parsons soil"},{"question":"Is Parsons soil expansive?","answer":"Its subsoil is clay with 35 to 60 percent clay. The official description gives no shrink-swell value, so the rated linear extensibility for a mapped area should be checked in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/parsons#faq-4","section":"soils","topic":"Parsons soil"},{"question":"What is perched water and how does it affect Oklahoma homes?","answer":"Perched water is rain backed up above a dense clay layer; in eastern Oklahoma it can wet crawl spaces, seep into basements and saturate footing clay.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water","section":"guides"},{"question":"How is perched water different from the true water table?","answer":"Perched water table: a temporary saturated zone sitting on a layer that water passes through slowly, such as dense clay or shale.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#how-is-perched-water-different-from-the-true-water-table","section":"guides","topic":"Perched water and water tables"},{"question":"Which Oklahoma soils have seasonal shallow water?","answer":"Dennis, Okemah, Parsons and Summit are common in the Tulsa area; see soil series - Tulsa metro.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#which-oklahoma-soils-have-seasonal-shallow-water","section":"guides","topic":"Perched water and water tables"},{"question":"How does shallow water affect houses?","answer":"Crawl spaces: standing water, damp framing and condensation (water, condensation or mold in crawl); Basements: seepage at the joint where the wall meets the floor (water at cove joint), and saturated soil pressing on walls; Foundation movement: groundwater is one of the moisture sources engineers list as causing differential movement on expansive clay.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#how-does-shallow-water-affect-houses","section":"guides","topic":"Perched water and water tables"},{"question":"What approaches address shallow water?","answer":"Engineering guidance lists dealing with the sources of moisture, including groundwater and drainage, as a first step.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#what-approaches-address-shallow-water","section":"guides","topic":"Perched water and water tables"},{"question":"What is a perched water table?","answer":"It is a temporary layer of saturated soil that forms when water soaking down from the surface reaches a dense clay layer or rock and can't drain through, so it builds up above it. It sits above the true water table and usually comes and goes with the seasons.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#faq-1","section":"guides","topic":"Perched water and water tables"},{"question":"When is perched water most common in eastern Oklahoma?","answer":"USDA descriptions of common Tulsa-area soils such as Parsons, Okemah and Dennis place the perched water table from December through April in normal years; for Summit it runs from November through May.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#faq-2","section":"guides","topic":"Perched water and water tables"},{"question":"How close to the surface can perched water be?","answer":"In Parsons soils the top of the perched water can be just 6 to 18 inches below the surface in winter and spring. In Okemah it is 2 to 3 feet down.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#faq-3","section":"guides","topic":"Perched water and water tables"},{"question":"Do houses near rivers have a different water problem?","answer":"They can. Flood-plain soils such as Osage have a seasonal high water table 6 to 18 inches deep from November through May, and some flood-plain soils such as Port flood occasionally to frequently.","url":"https://terrabrain.vercel.app/guides/groundwater-and-perched-water#faq-4","section":"guides","topic":"Perched water and water tables"},{"question":"What is Pond Creek soil and how does it affect Oklahoma foundations?","answer":"Pond Creek is a deep, well-drained silty soil partly formed in loess, with moderate clay, so water management and possible collapse are the main concerns.","url":"https://terrabrain.vercel.app/soils/pond-creek","section":"soils"},{"question":"What is Pond Creek soil?","answer":"Pond Creek is an official USDA soil series classified as \"Fine-silty, mixed, superactive, thermic Pachic Argiustolls\". It formed in calcareous loamy material high in silt and very fine sand, derived from loess, alluvium and residuum from red beds.","url":"https://terrabrain.vercel.app/soils/pond-creek#what-is-pond-creek-soil","section":"soils","topic":"Pond Creek soil"},{"question":"What does a Pond Creek soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/pond-creek#what-does-a-pond-creek-soil-profile-look-like","section":"soils","topic":"Pond Creek soil"},{"question":"What does Pond Creek soil mean for foundations?","answer":"The USDA rates shrink-swell as linear extensibility, the linear expression of volume change from moist to oven-dry: under 3 percent low, 3 to 6 percent moderate, 6 to 9 percent high.","url":"https://terrabrain.vercel.app/soils/pond-creek#what-does-pond-creek-soil-mean-for-foundations","section":"soils","topic":"Pond Creek soil"},{"question":"What is Pond Creek soil made of?","answer":"It formed in calcareous loamy material derived from loess (windblown silt), alluvium and red-bed residuum. It is silt loam at the surface over silty clay loam.","url":"https://terrabrain.vercel.app/soils/pond-creek#faq-1","section":"soils","topic":"Pond Creek soil"},{"question":"Where is Pond Creek soil found?","answer":"On broad uplands of the Central Rolling Red Prairies in north-central Oklahoma and south-central Kansas. The type location is in Garfield County near Carrier.","url":"https://terrabrain.vercel.app/soils/pond-creek#faq-2","section":"soils","topic":"Pond Creek soil"},{"question":"Is Pond Creek soil expansive?","answer":"Its subsoil is silty clay loam with about 28 to 35 percent clay in the upper 20 inches and up to 45 percent lower down. The rated shrink-swell value for a mapped area is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/pond-creek#faq-3","section":"soils","topic":"Pond Creek soil"},{"question":"Can loess-derived soil collapse when wet?","answer":"Windblown deposits such as loess are one of the deposit types engineers check for collapse, a loss of volume on wetting. Whether a specific site is collapsible is determined by lab testing.","url":"https://terrabrain.vercel.app/soils/pond-creek#faq-4","section":"soils","topic":"Pond Creek soil"},{"question":"What is Port silt loam, Oklahoma's state soil, and does it flood?","answer":"Port silt loam is Oklahoma's state soil, a deep floodplain soil on about one million acres in 33 counties that floods briefly between March and October.","url":"https://terrabrain.vercel.app/soils/port","section":"soils"},{"question":"What is Port soil?","answer":"Port is an official USDA soil series classified as \"Fine-silty, mixed, superactive, thermic Cumulic Haplustolls\". Flood plains are among the landscape positions that periodically receive fresh sediment.","url":"https://terrabrain.vercel.app/soils/port#what-is-port-soil","section":"soils","topic":"Port silt loam"},{"question":"What does a Port soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/port#what-does-a-port-soil-profile-look-like","section":"soils","topic":"Port silt loam"},{"question":"What does Port soil mean for foundations?","answer":"Port forms on flood plains and floods occasionally or frequently. The Soil Science Society of America summary identifies occasional flooding as Port's main limitation.","url":"https://terrabrain.vercel.app/soils/port#what-does-port-soil-mean-for-foundations","section":"soils","topic":"Port silt loam"},{"question":"Port silt loam: How do you confirm the soil at a property?","answer":"Web Soil Survey shows the mapped soil unit and soil data for an area, and can generate custom reports; FEMA's map service center provides the FIRM panel and a printable flood map (FIRMette) for an address, and notes that later map changes (LOMCs) should be checked.","url":"https://terrabrain.vercel.app/soils/port#how-do-you-confirm-the-soil-at-a-property","section":"soils","topic":"Port silt loam"},{"question":"Port silt loam: What is Oklahoma's state soil?","answer":"Port silt loam. The Governor and Legislature named it the state soil in 1987. It covers about one million acres in 33 of Oklahoma's 77 counties.","url":"https://terrabrain.vercel.app/soils/port#faq-1","section":"soils","topic":"Port silt loam"},{"question":"Does Port soil flood?","answer":"Yes. The official description says it is occasionally or frequently flooded for very brief periods from March to October.","url":"https://terrabrain.vercel.app/soils/port#faq-2","section":"soils","topic":"Port silt loam"},{"question":"Is Port soil good to build on?","answer":"Soil scientists list occasional flooding as its main limitation. A Soil Science Society of America summary also notes that low strength and shrink-swell limit its use for local roads and streets.","url":"https://terrabrain.vercel.app/soils/port#faq-3","section":"soils","topic":"Port silt loam"},{"question":"Where is Port soil found?","answer":"On narrow flood plains in western and central Oklahoma, as well as parts of Kansas and Texas. Its type location is in Grady County, east of Chickasha.","url":"https://terrabrain.vercel.app/soils/port#faq-4","section":"soils","topic":"Port silt loam"},{"question":"What is Pratt soil and is it found in Oklahoma?","answer":"Pratt is a deep, sandy dune soil with thin clay bands, mapped mainly in south-central Kansas; its Oklahoma extent should be confirmed site by site.","url":"https://terrabrain.vercel.app/soils/pratt","section":"soils"},{"question":"What is Pratt soil?","answer":"Pratt is an official USDA soil series classified as \"Sandy, mixed, mesic Lamellic Haplustalfs\". \"Lamellic\" refers to its lamellae, and \"sandy\" describes its texture.","url":"https://terrabrain.vercel.app/soils/pratt#what-is-pratt-soil","section":"soils","topic":"Pratt soil"},{"question":"What is its typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/pratt#what-is-its-typical-soil-profile","section":"soils","topic":"Pratt soil"},{"question":"Pratt soil: What does it mean for foundations?","answer":"The USDA measures shrink-swell as linear extensibility, with under 3 percent rated low. With 4 to 11 percent clay and 80 to 90 percent sand in its control section, Pratt lacks the clay content behind seasonal shrink-swell. The rated value for a mapped unit is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/pratt#what-does-it-mean-for-foundations","section":"soils","topic":"Pratt soil"},{"question":"Is Pratt soil found in Oklahoma?","answer":"The official description's header lists Kansas and Oklahoma and notes a 1995 update for Oklahoma, but its distribution section names only south-central Kansas. Check Web Soil Survey to see whether Pratt is mapped at a specific Oklahoma address.","url":"https://terrabrain.vercel.app/soils/pratt#faq-1","section":"soils","topic":"Pratt soil"},{"question":"Is Pratt soil expansive?","answer":"No. Pratt is sandy, with only about 4 to 11 percent clay in its control section. Clay-driven shrink-swell is not a feature of this soil.","url":"https://terrabrain.vercel.app/soils/pratt#faq-2","section":"soils","topic":"Pratt soil"},{"question":"What are the thin bands in Pratt soil?","answer":"They are lamellae, thin layers less than 3 inches thick where clay has collected within otherwise sandy soil. They slow water movement slightly.","url":"https://terrabrain.vercel.app/soils/pratt#faq-3","section":"soils","topic":"Pratt soil"},{"question":"Can sandy windblown soil collapse?","answer":"Windblown sand dunes and loess are among the deposit types engineers check for collapse, a loss of volume when wetted. Lab testing determines whether a specific site is collapsible.","url":"https://terrabrain.vercel.app/soils/pratt#faq-4","section":"soils","topic":"Pratt soil"},{"question":"What is Pulaski soil and how does it affect Oklahoma foundations?","answer":"Pulaski is a very deep, well-drained creek floodplain sandy loam; flooding, water movement and erosion, not clay swelling, are its foundation issues.","url":"https://terrabrain.vercel.app/soils/pulaski","section":"soils"},{"question":"What is Pulaski soil?","answer":"Pulaski is an official USDA soil series classified as \"Coarse-loamy, mixed, superactive, nonacid, thermic Udic Ustifluvents\".","url":"https://terrabrain.vercel.app/soils/pulaski#what-is-pulaski-soil","section":"soils","topic":"Pulaski soil"},{"question":"What is the typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/pulaski#what-is-the-typical-soil-profile","section":"soils","topic":"Pulaski soil"},{"question":"What does Pulaski soil mean for foundations?","answer":"Pulaski forms on creek flood plains and floods occasionally to frequently. FEMA's Flood Map Service Center provides the official Flood Insurance Rate Map panel and a printable flood map (FIRMette) for any address, and lists any later map revisions.","url":"https://terrabrain.vercel.app/soils/pulaski#what-does-pulaski-soil-mean-for-foundations","section":"soils","topic":"Pulaski soil"},{"question":"How do you confirm the soil at a property?","answer":"Web Soil Survey shows mapped soil units and soil data for more than 95 percent of U.S. counties.","url":"https://terrabrain.vercel.app/soils/pulaski#how-do-you-confirm-the-soil-at-a-property","section":"soils","topic":"Pulaski soil"},{"question":"Does Pulaski soil flood?","answer":"Yes. The official description lists occasional to frequent, very brief flooding from March to October.","url":"https://terrabrain.vercel.app/soils/pulaski#faq-1","section":"soils","topic":"Pulaski soil"},{"question":"Where is Pulaski soil found in Oklahoma?","answer":"On flood plains of small tributaries in the Northern Cross Timbers of Oklahoma, Kansas and Texas. Its type location is in Lincoln County, near Chandler.","url":"https://terrabrain.vercel.app/soils/pulaski#faq-2","section":"soils","topic":"Pulaski soil"},{"question":"Is Pulaski soil expansive?","answer":"It is not described as expansive. It is fine sandy loam throughout, with no clay-enriched subsoil. Clay shrink-swell is not a defining feature of this soil.","url":"https://terrabrain.vercel.app/soils/pulaski#faq-3","section":"soils","topic":"Pulaski soil"},{"question":"Pulaski soil: How do I check whether my house is in a flood zone?","answer":"Search the address in FEMA's Flood Map Service Center, which provides the official Flood Insurance Rate Map panel and a printable flood map.","url":"https://terrabrain.vercel.app/soils/pulaski#faq-4","section":"soils","topic":"Pulaski soil"},{"question":"What is Quinlan soil and how does it affect Oklahoma foundations?","answer":"A shallow loam over soft Permian sandstone at 10 to 20 inches in western Oklahoma; shallow rock, steep slopes and fast runoff matter more than clay swell.","url":"https://terrabrain.vercel.app/soils/quinlan","section":"soils"},{"question":"What is Quinlan soil?","answer":"Quinlan is an official USDA soil series classified as \"Loamy, mixed, superactive, thermic, shallow Typic Haplustepts\". It formed in loamy residuum (rock weathered in place) from noncemented, calcareous Permian sandstone or siltstone.","url":"https://terrabrain.vercel.app/soils/quinlan#what-is-quinlan-soil","section":"soils","topic":"Quinlan soil"},{"question":"What is the typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/quinlan#what-is-the-typical-soil-profile","section":"soils","topic":"Quinlan soil"},{"question":"Quinlan soil: What does it mean for foundations?","answer":"Densic materials are compact, noncemented layers that restrict roots, with compaction from geologic or human causes rather than soil formation.","url":"https://terrabrain.vercel.app/soils/quinlan#what-does-it-mean-for-foundations","section":"soils","topic":"Quinlan soil"},{"question":"How deep is rock in Quinlan soil?","answer":"Dense, noncemented sandstone bedrock starts 10 to 20 inches below the surface, at about 13 inches in the typical profile.","url":"https://terrabrain.vercel.app/soils/quinlan#faq-1","section":"soils","topic":"Quinlan soil"},{"question":"Where is Quinlan soil found?","answer":"In the Central Rolling Red Plains of western Oklahoma, a few counties of southern Kansas, and northwestern Texas. It was named and established near Quinlan in Woodward County.","url":"https://terrabrain.vercel.app/soils/quinlan#faq-2","section":"soils","topic":"Quinlan soil"},{"question":"Is Quinlan soil expansive?","answer":"Quinlan is a loam with mostly 10 to 20 percent clay in its subsoil. It is not described as a clay soil; the rated shrink-swell value for a mapped area is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/quinlan#faq-3","section":"soils","topic":"Quinlan soil"},{"question":"Is the sandstone under Quinlan hard rock?","answer":"No. The official description calls it noncemented, calcareous sandstone that breaks down to very fine sandy loam, loam or silt loam. It is dense enough to restrict roots.","url":"https://terrabrain.vercel.app/soils/quinlan#faq-4","section":"soils","topic":"Quinlan soil"},{"question":"What is Renfrow soil and how does it affect Oklahoma foundations?","answer":"Renfrow is a deep clay soil from Permian shale with seasonal cracks, slickensides and high linear extensibility, all signs of strong shrink-swell.","url":"https://terrabrain.vercel.app/soils/renfrow","section":"soils"},{"question":"What is Renfrow soil?","answer":"Renfrow is an official USDA soil series classified as \"Fine, mixed, superactive, thermic Udertic Paleustolls\". \"Udertic\" marks a vertic intergrade, a soil trending toward the Vertisols.","url":"https://terrabrain.vercel.app/soils/renfrow#what-is-renfrow-soil","section":"soils","topic":"Renfrow soil"},{"question":"What does a Renfrow soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/renfrow#what-does-a-renfrow-soil-profile-look-like","section":"soils","topic":"Renfrow soil"},{"question":"What does Renfrow soil mean for foundations?","answer":"Slickensides are polished, grooved faces formed by repeated shrinking and swelling, and Renfrow has them through most of its subsoil. Its linear extensibility of 6 cm or more in the upper meter meets the key criterion soil taxonomy uses for vertic subgroups.","url":"https://terrabrain.vercel.app/soils/renfrow#what-does-renfrow-soil-mean-for-foundations","section":"soils","topic":"Renfrow soil"},{"question":"Is Renfrow soil expansive?","answer":"Yes. The official description lists vertic properties: cracks at least 5 mm wide in most years, slickensides, and a linear extensibility of 6 cm or more in the upper 100 cm.","url":"https://terrabrain.vercel.app/soils/renfrow#faq-1","section":"soils","topic":"Renfrow soil"},{"question":"Where is Renfrow soil found?","answer":"On low hills of the Central Rolling Red Prairies in Oklahoma, Kansas and Texas. Its type location is in Kay County, near Tonkawa.","url":"https://terrabrain.vercel.app/soils/renfrow#faq-2","section":"soils","topic":"Renfrow soil"},{"question":"How deep is shale under Renfrow soil?","answer":"Soft, noncemented shale begins deeper than 60 inches. The soil above it is mostly clay.","url":"https://terrabrain.vercel.app/soils/renfrow#faq-3","section":"soils","topic":"Renfrow soil"},{"question":"Why does Renfrow soil crack in summer?","answer":"Its clay subsoil shrinks as it dries and swells when it wets. The official description notes cracks at least 5 mm wide within about 4 feet of the surface for some time in most years.","url":"https://terrabrain.vercel.app/soils/renfrow#faq-4","section":"soils","topic":"Renfrow soil"},{"question":"What is Richfield soil and how does it affect Oklahoma foundations?","answer":"Richfield is a deep Panhandle loess soil with a smectitic subsoil of 35 to 42 percent clay, so clay movement and collapse on wetting both matter.","url":"https://terrabrain.vercel.app/soils/richfield","section":"soils"},{"question":"What is Richfield soil?","answer":"Richfield is an official USDA soil series classified as \"Fine, smectitic, mesic Aridic Argiustolls\". \"Smectitic\" refers to its clay mineralogy. It formed in calcareous loess 1 meter (about 3 feet) to more than 3 meters (about 10 feet) thick.","url":"https://terrabrain.vercel.app/soils/richfield#what-is-richfield-soil","section":"soils","topic":"Richfield soil"},{"question":"What does a Richfield soil profile look like?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/richfield#what-does-a-richfield-soil-profile-look-like","section":"soils","topic":"Richfield soil"},{"question":"What does Richfield soil mean for foundations?","answer":"A federal survey of expansive materials noted that montmorillonite, a smectite clay, contributes to the widespread occurrence of expansive materials, notably in the Great Plains. Richfield's subsoil is smectitic with 35 to 42 percent clay.","url":"https://terrabrain.vercel.app/soils/richfield#what-does-richfield-soil-mean-for-foundations","section":"soils","topic":"Richfield soil"},{"question":"Where is Richfield soil found?","answer":"On high-plains tablelands in western Kansas and Nebraska, eastern Colorado, southwestern South Dakota and the Oklahoma Panhandle. Its type location is in Grant County, Kansas.","url":"https://terrabrain.vercel.app/soils/richfield#faq-1","section":"soils","topic":"Richfield soil"},{"question":"Is Richfield soil expansive?","answer":"Its subsoil has 35 to 42 percent clay and is classed as smectitic, the clay group associated with expansive soils. The rated shrink-swell value for a mapped area is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/richfield#faq-2","section":"soils","topic":"Richfield soil"},{"question":"Richfield soil: What is loess?","answer":"Loess is windblown silt. Richfield formed in calcareous loess 3 to more than 10 feet thick.","url":"https://terrabrain.vercel.app/soils/richfield#faq-3","section":"soils","topic":"Richfield soil"},{"question":"Can Richfield soil collapse when it gets wet?","answer":"Loess is one of the deposit types engineers check for collapse, a loss of volume on wetting. The official description does not report collapse, so testing is needed at a specific site.","url":"https://terrabrain.vercel.app/soils/richfield#faq-4","section":"soils","topic":"Richfield soil"},{"question":"What is shrink-swell clay and the active zone under a foundation?","answer":"Expansive clay swells when wet and shrinks when dry; the active zone is the layer, often several to over 10 feet thick, whose moisture changes enough to move.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone","section":"guides"},{"question":"Shrink-swell and active zone: What are the key terms?","answer":"Shrink-swell: the change in volume of clay soil as its moisture changes. Expansive soils swell when water enters and shrink when they dry; Active zone: the depth of soil whose moisture changes with seasons and other influences, and therefore moves.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#what-are-the-key-terms","section":"guides","topic":"Shrink-swell and active zone"},{"question":"Why do some clays swell more?","answer":"Clay particles are extremely small, under 2 microns. Smectite clays, including montmorillonite, take water into the spaces between their mineral layers, and that is the main way they swell.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#why-do-some-clays-swell-more","section":"guides","topic":"Shrink-swell and active zone"},{"question":"How deep does the active zone go?","answer":"There is no single number. Engineers note that active depth is hard to calculate and that local or regional experience is the most effective way to establish it.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#how-deep-does-the-active-zone-go","section":"guides","topic":"Shrink-swell and active zone"},{"question":"Shrink-swell and active zone: What movement patterns does clay cause?","answer":"Uneven moisture twists a slab into a center-lift or edge-lift shape. Center lift is linked to long-term moisture gain under older foundations, while edge lift and edge drop follow seasonal or short-term moisture changes. Telling them apart is covered in heave vs settlement.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#what-movement-patterns-does-clay-cause","section":"guides","topic":"Shrink-swell and active zone"},{"question":"Shrink-swell and active zone: Why don't piers alone address the cause?","answer":"Piers transfer a foundation's weight to deeper soil or rock, which stops a perimeter from going down. Engineering sources note that the first step is dealing with what causes the moisture difference, such as drainage, leaking pipes, trees or irrigation.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#why-don-t-piers-alone-address-the-cause","section":"guides","topic":"Shrink-swell and active zone"},{"question":"What is the active zone in soil?","answer":"The active zone is the depth of soil whose moisture, and therefore volume, changes with seasons, droughts, watering and other influences. Below it, moisture stays relatively steady and the soil moves little.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#faq-1","section":"guides","topic":"Shrink-swell and active zone"},{"question":"How deep is the active zone?","answer":"It varies widely. Studies of Texas clay sites measured roughly 8 to 12 feet, a Houston case found about 28 feet where trees were drying the soil, and Texas-wide estimates range from about 5 feet to more than 30 feet.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#faq-2","section":"guides","topic":"Shrink-swell and active zone"},{"question":"Shrink-swell and active zone: What is the difference between center lift and edge lift?","answer":"Center lift happens when soil under the middle of a slab is wetter and higher than soil at the edges, often from long-term moisture build-up. Edge lift happens when the soil at the perimeter gets wetter and swells while the center stays drier.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#faq-3","section":"guides","topic":"Shrink-swell and active zone"},{"question":"Does drought make the active zone deeper?","answer":"It can. A study of clay sites during the 2011 drought found the zone of seasonal moisture change deepened by about 2 feet.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#faq-4","section":"guides","topic":"Shrink-swell and active zone"},{"question":"Why do some clays swell more than others?","answer":"Swelling depends mainly on the clay minerals. Smectite clays such as montmorillonite absorb water between their layers and swell the most.","url":"https://terrabrain.vercel.app/guides/shrink-swell-and-active-zone#faq-5","section":"guides","topic":"Shrink-swell and active zone"},{"question":"What is St. Paul soil and how does it affect Oklahoma foundations?","answer":"St. Paul is a deep, well-drained western Oklahoma terrace soil with a silty clay loam subsoil of 27-40% clay; moisture control is the main foundation issue.","url":"https://terrabrain.vercel.app/soils/st-paul","section":"soils"},{"question":"What is St. Paul soil?","answer":"St. Paul is an official USDA soil series classified as \"Fine-silty, mixed, superactive, thermic Pachic Argiustolls\". It formed in a thin layer of Pleistocene (Ice Age) silty alluvium over residuum (rock weathered in place) from Permian siltstone and sandstone.","url":"https://terrabrain.vercel.app/soils/st-paul#what-is-st-paul-soil","section":"soils","topic":"St. Paul soil"},{"question":"What is the typical soil profile?","answer":"Source for the table:. Other properties from the official description:","url":"https://terrabrain.vercel.app/soils/st-paul#what-is-the-typical-soil-profile","section":"soils","topic":"St. Paul soil"},{"question":"What does St. Paul soil mean for foundations?","answer":"The USDA rates shrink-swell as linear extensibility, a linear expression of the change in soil volume between moist and oven-dry states: under 3 percent low, 3 to 6 percent moderate, 6 to 9 percent high, 9 percent or more very high. St.","url":"https://terrabrain.vercel.app/soils/st-paul#what-does-st-paul-soil-mean-for-foundations","section":"soils","topic":"St. Paul soil"},{"question":"Where is St. Paul soil found?","answer":"On broad paleoterraces in the Central Rolling Red Plains of western Oklahoma, Texas and Kansas. Its type location is in Roger Mills County near Leedey, and it was established in Kiowa County.","url":"https://terrabrain.vercel.app/soils/st-paul#faq-1","section":"soils","topic":"St. Paul soil"},{"question":"Is St. Paul soil expansive?","answer":"Its subsoil is silty clay loam with about 27 to 35 percent clay in the upper part, rising to as much as 40 percent lower down. The rated shrink-swell value for a mapped area is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/st-paul#faq-2","section":"soils","topic":"St. Paul soil"},{"question":"What is under St. Paul soil?","answer":"A thin layer of Ice Age silty alluvium sits over material weathered from Permian siltstone and sandstone. Depth to bedrock is not stated in the official description.","url":"https://terrabrain.vercel.app/soils/st-paul#faq-3","section":"soils","topic":"St. Paul soil"},{"question":"Does St. Paul soil drain well?","answer":"It is well drained, but its permeability is moderately slow, so water moves through the subsoil gradually.","url":"https://terrabrain.vercel.app/soils/st-paul#faq-4","section":"soils","topic":"St. Paul soil"},{"question":"What is Stephenville soil and how does it affect Oklahoma foundations?","answer":"A moderately deep, well-drained sandy soil over soft sandstone at 20 to 40 inches; sandy texture, shallow rock and water handling matter more than swelling.","url":"https://terrabrain.vercel.app/soils/stephenville","section":"soils"},{"question":"Where does Stephenville soil occur?","answer":"Every named soil in the U.S. has an Official Series Description (OSD) kept by the USDA Natural Resources Conservation Service (NRCS). The Stephenville OSD places the series in central Oklahoma, in Major Land Resource Area 84A, the Northern Cross Timbers, and calls it extensive.","url":"https://terrabrain.vercel.app/soils/stephenville#where-does-stephenville-soil-occur","section":"soils","topic":"Stephenville soil"},{"question":"Stephenville soil: What are its key properties?","answer":"A \"paralithic contact\" is the top of soft, weakly cemented rock that can be dug with effort. In Stephenville it is weakly cemented sandstone. The \"Bt\" horizon is the subsoil layer where clay has collected over time.","url":"https://terrabrain.vercel.app/soils/stephenville#what-are-its-key-properties","section":"soils","topic":"Stephenville soil"},{"question":"Stephenville soil: What do the properties mean for foundations?","answer":"Clay soils swell when wet and shrink when dry, and uneven moisture change is what moves foundations. NRCS rates this with linear extensibility: under 3 percent is low, 3 to 6 percent moderate, 6 to 9 percent high, and above 9 percent very high.","url":"https://terrabrain.vercel.app/soils/stephenville#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Stephenville soil"},{"question":"Is Stephenville soil an expansive clay?","answer":"Stephenville's subsoil is sandy clay loam or fine sandy loam, not a heavy clay, so it is generally not grouped with Oklahoma's high shrink-swell soils. The rated shrink-swell value for a specific map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/stephenville#faq-1","section":"soils","topic":"Stephenville soil"},{"question":"How deep is the rock under Stephenville soil?","answer":"The official description puts weakly cemented Permian sandstone at 20 to 40 inches below the surface. The typical profile reaches that sandstone at about 33 inches.","url":"https://terrabrain.vercel.app/soils/stephenville#faq-2","section":"soils","topic":"Stephenville soil"},{"question":"Where is Stephenville soil found in Oklahoma?","answer":"Stephenville is an extensive soil of central Oklahoma in the Northern Cross Timbers, on hill side slopes. Its type location is in Oklahoma County near Spencer.","url":"https://terrabrain.vercel.app/soils/stephenville#faq-3","section":"soils","topic":"Stephenville soil"},{"question":"How can I find out if my lot is mapped as Stephenville?","answer":"Web Soil Survey, the free USDA soil map, shows the mapped soil units for any address. A site investigation confirms what is actually under a specific house.","url":"https://terrabrain.vercel.app/soils/stephenville#faq-4","section":"soils","topic":"Stephenville soil"},{"question":"What is Summit soil and how does it affect Oklahoma foundations?","answer":"Summit is a deep shale-derived soil with a 40 to 70 percent smectitic clay subsoil, high to very high shrink-swell and a perched water table in winter and spring.","url":"https://terrabrain.vercel.app/soils/summit","section":"soils"},{"question":"Where does Summit soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for every named soil.","url":"https://terrabrain.vercel.app/soils/summit#where-does-summit-soil-occur","section":"soils","topic":"Summit soil"},{"question":"What are the key properties of Summit soil?","answer":"\"Smectitic\" means the clay is dominated by smectite, the clay mineral group that swells most when wet.","url":"https://terrabrain.vercel.app/soils/summit#what-are-the-key-properties-of-summit-soil","section":"soils","topic":"Summit soil"},{"question":"Summit soil: What do these properties mean for foundations?","answer":"The coefficient of linear extensibility (COLE) is the change in length of a soil clod from moist to dry, and as a percent it is called linear extensibility (LEP).","url":"https://terrabrain.vercel.app/soils/summit#what-do-these-properties-mean-for-foundations","section":"soils","topic":"Summit soil"},{"question":"Is Summit soil expansive?","answer":"Yes. The official description gives Summit a coefficient of linear extensibility of 0.09 or more, which is at the high to very high end of the NRCS shrink-swell scale, and notes deep, wide cracks that usually form in summer.","url":"https://terrabrain.vercel.app/soils/summit#faq-1","section":"soils","topic":"Summit soil"},{"question":"Where is Summit soil found?","answer":"Summit is an extensive soil of eastern Oklahoma, southeastern Kansas, southwestern Missouri and northwestern Arkansas. Its type location is in Rogers County, Oklahoma.","url":"https://terrabrain.vercel.app/soils/summit#faq-2","section":"soils","topic":"Summit soil"},{"question":"Does Summit soil stay wet?","answer":"In normal years Summit has a perched water table 12 to 36 inches below the surface from November to May, and water moves through it slowly.","url":"https://terrabrain.vercel.app/soils/summit#faq-3","section":"soils","topic":"Summit soil"},{"question":"How do I find out if my house is on Summit soil?","answer":"Web Soil Survey, the USDA online soil map, shows the mapped soil units for any address, including their rated shrink-swell. A site investigation confirms actual conditions.","url":"https://terrabrain.vercel.app/soils/summit#faq-4","section":"soils","topic":"Summit soil"},{"question":"What is Tabler soil and how does it affect Oklahoma foundations?","answer":"Tabler is a very deep clay soil of north-central Oklahoma with a 35 to 50 percent clay subsoil that drains very slowly and moves with the seasons.","url":"https://terrabrain.vercel.app/soils/tabler","section":"soils"},{"question":"Where does Tabler soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) maintains an Official Series Description (OSD) for each named soil.","url":"https://terrabrain.vercel.app/soils/tabler#where-does-tabler-soil-occur","section":"soils","topic":"Tabler soil"},{"question":"What are Tabler soil's key properties?","answer":"The jump from a silt loam surface to a clay subsoil is typical of a claypan profile. \"Udertic\" in the classification marks some vertic traits without a full Vertisol; Tabler has slickensides, the polished surfaces that Vertisols form through shrinking and swelling.","url":"https://terrabrain.vercel.app/soils/tabler#what-are-tabler-soil-s-key-properties","section":"soils","topic":"Tabler soil"},{"question":"What does Tabler soil mean for foundations?","answer":"Vertisols and vertic soils shrink and crack in dry periods and swell when rewetted, and that behavior creates serious engineering problems. Tabler's slickensides, which cover up to 80 percent of some subsoil layers, are a physical record of that movement.","url":"https://terrabrain.vercel.app/soils/tabler#what-does-tabler-soil-mean-for-foundations","section":"soils","topic":"Tabler soil"},{"question":"Is Tabler soil expansive?","answer":"Tabler's subsoil is silty clay loam or silty clay with 35 to 50 percent clay, and slickensides make up 20 to 80 percent of some layers. Slickensides form from repeated swelling and shrinking, so the soil is classed with vertic-type properties. The rated value for a lot is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/tabler#faq-1","section":"soils","topic":"Tabler soil"},{"question":"Where is Tabler soil found?","answer":"Tabler occurs in the Central Rolling Red Prairies of north-central Oklahoma and south-central Kansas. Its type location is near Medford in Grant County, Oklahoma.","url":"https://terrabrain.vercel.app/soils/tabler#faq-2","section":"soils","topic":"Tabler soil"},{"question":"Why does water drain so slowly on Tabler soil?","answer":"The official description rates Tabler's permeability as very slow because of its dense, clayey subsoil, and it sits on nearly level ground with 0 to 1 percent slopes.","url":"https://terrabrain.vercel.app/soils/tabler#faq-3","section":"soils","topic":"Tabler soil"},{"question":"How can I tell if my house is on Tabler soil?","answer":"Web Soil Survey, the free USDA soil map, shows mapped soils for any address. A site investigation confirms actual conditions on a lot.","url":"https://terrabrain.vercel.app/soils/tabler#faq-4","section":"soils","topic":"Tabler soil"},{"question":"What is Talihina soil and how does it affect Oklahoma foundations?","answer":"Talihina is a shallow, poorly drained eastern Oklahoma clay over soft shale 10 to 20 inches down, so shallow shale, wet-season water and clay matter most.","url":"https://terrabrain.vercel.app/soils/talihina","section":"soils"},{"question":"Where does Talihina soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. The Talihina OSD lists the series in eastern Oklahoma, southeastern Kansas and southwestern Missouri, and calls it extensive.","url":"https://terrabrain.vercel.app/soils/talihina#where-does-talihina-soil-occur","section":"soils","topic":"Talihina soil"},{"question":"Talihina soil: What are its key properties?","answer":"\"Bw\" means a weakly developed subsoil layer; Talihina has no clay-enriched \"Bt\" layer. The soft rock at its base is a \"paralithic contact,\" rock that is weakly cemented rather than hard.","url":"https://terrabrain.vercel.app/soils/talihina#what-are-its-key-properties","section":"soils","topic":"Talihina soil"},{"question":"Talihina soil: What do its properties mean for foundations?","answer":"Talihina's surface layer has 35 to 55 percent clay and its subsoil 35 to 40 percent. The OSD does not record deep cracks or slickensides for Talihina; it notes only a few pressure faces.","url":"https://terrabrain.vercel.app/soils/talihina#what-do-its-properties-mean-for-foundations","section":"soils","topic":"Talihina soil"},{"question":"How deep is the rock under Talihina soil?","answer":"Talihina is a shallow soil. Soft shale bedrock lies 10 to 20 inches below the surface, at about 15 inches in the typical profile.","url":"https://terrabrain.vercel.app/soils/talihina#faq-1","section":"soils","topic":"Talihina soil"},{"question":"Is Talihina soil clayey?","answer":"Yes. Its surface layer has 35 to 55 percent clay and its subsoil 35 to 40 percent, with silty clay loam, silty clay or clay textures. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/talihina#faq-2","section":"soils","topic":"Talihina soil"},{"question":"Does Talihina soil hold water?","answer":"The official description rates it poorly drained with slow permeability, and a perched water table can sit 0.5 to 2 feet down for short periods from November to April.","url":"https://terrabrain.vercel.app/soils/talihina#faq-3","section":"soils","topic":"Talihina soil"},{"question":"Where is Talihina soil found?","answer":"Talihina occurs in eastern Oklahoma, southeastern Kansas and southwestern Missouri on ridges and side slopes of dissected uplands. Its type location is near Holdenville in Hughes County.","url":"https://terrabrain.vercel.app/soils/talihina#faq-4","section":"soils","topic":"Talihina soil"},{"question":"What is Taloka soil and how does it affect Oklahoma foundations?","answer":"Taloka is a very deep soil with a silty surface that changes abruptly to dense clay, and a perched water table 12 to 24 inches down from late fall through spring.","url":"https://terrabrain.vercel.app/soils/taloka","section":"soils"},{"question":"Where does Taloka soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for every named soil.","url":"https://terrabrain.vercel.app/soils/taloka#where-does-taloka-soil-occur","section":"soils","topic":"Taloka soil"},{"question":"Taloka soil: What are its key properties?","answer":"The \"E\" horizon is a pale, leached layer above the subsoil; in Taloka it runs from about 8 to 28 inches and ends at an abrupt boundary where texture jumps to silty clay or clay loam.","url":"https://terrabrain.vercel.app/soils/taloka#what-are-its-key-properties","section":"soils","topic":"Taloka soil"},{"question":"Taloka soil: What do the properties mean for foundations?","answer":"With 35 to 60 percent clay, Taloka's subsoil can shrink when it dries and swell when it wets. The OSD does not record deep cracks or slickensides for this series.","url":"https://terrabrain.vercel.app/soils/taloka#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Taloka soil"},{"question":"Does Taloka have a dense clay subsoil?","answer":"Yes. Taloka changes abruptly from silt loam to silty clay or clay loam at about 28 inches, and its very firm subsoil has 35 to 60 percent clay.","url":"https://terrabrain.vercel.app/soils/taloka#faq-1","section":"soils","topic":"Taloka soil"},{"question":"Does Taloka soil stay wet?","answer":"Yes, seasonally. In normal years a perched water table sits 12 to 24 inches below the surface from November through May, and water moves through the subsoil very slowly.","url":"https://terrabrain.vercel.app/soils/taloka#faq-2","section":"soils","topic":"Taloka soil"},{"question":"Where is Taloka soil found?","answer":"Taloka occurs in northeastern Oklahoma, northwestern Arkansas and southeastern Kansas on interfluves and old terraces. Its type location is near Wagoner in Wagoner County.","url":"https://terrabrain.vercel.app/soils/taloka#faq-3","section":"soils","topic":"Taloka soil"},{"question":"Is Taloka expansive?","answer":"Its clayey subsoil can shrink and swell, but the official description does not list a shrink-swell value or slickensides. The rated linear extensibility for a map unit is shown in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/taloka#faq-4","section":"soils","topic":"Taloka soil"},{"question":"What is Teller soil and how does it affect Oklahoma foundations?","answer":"A very deep, well-drained terrace loam with about 18 to 30 percent clay in its subsoil; drainage, leaks, erosion and fill quality are checked first.","url":"https://terrabrain.vercel.app/soils/teller","section":"soils"},{"question":"Where does Teller soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. The Teller OSD places the series in the Central Rolling Red Prairies (Major Land Resource Area 80A) of Oklahoma and Texas, with moderate extent.","url":"https://terrabrain.vercel.app/soils/teller#where-does-teller-soil-occur","section":"soils","topic":"Teller soil"},{"question":"Teller soil: What are its key properties?","answer":"The \"Bt\" horizon is the subsoil layer where clay has built up over time; in Teller it runs from about 20 to 60 inches.","url":"https://terrabrain.vercel.app/soils/teller#what-are-its-key-properties","section":"soils","topic":"Teller soil"},{"question":"Teller soil: What do the properties mean for foundations?","answer":"NRCS rates shrink-swell by linear extensibility: under 3 percent is low, 3 to 6 percent moderate, 6 to 9 percent high and above 9 percent very high. Teller's subsoil is a loam-family texture rather than a clay, and its OSD records no cracking or slickensides.","url":"https://terrabrain.vercel.app/soils/teller#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Teller soil"},{"question":"Is Teller soil expansive?","answer":"Teller's subsoil is sandy clay loam or clay loam, with the upper part averaging 18 to 30 percent clay, so it is not a heavy clay. The rated shrink-swell value for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/teller#faq-1","section":"soils","topic":"Teller soil"},{"question":"Where is Teller soil found?","answer":"Teller occurs in the Central Rolling Red Prairies of Oklahoma and Texas on stream terraces. Its type location is near Perkins in Payne County, Oklahoma.","url":"https://terrabrain.vercel.app/soils/teller#faq-2","section":"soils","topic":"Teller soil"},{"question":"Does Teller soil drain well?","answer":"Yes. The official description rates Teller as well drained with moderate permeability.","url":"https://terrabrain.vercel.app/soils/teller#faq-3","section":"soils","topic":"Teller soil"},{"question":"How deep is bedrock under Teller soil?","answer":"Bedrock is more than 80 inches below the surface; Teller formed in deep loamy Pleistocene terrace sediments.","url":"https://terrabrain.vercel.app/soils/teller#faq-4","section":"soils","topic":"Teller soil"},{"question":"What is Tillman soil and how does it affect Oklahoma foundations?","answer":"Tillman is a deep red-bed clay in southwest Oklahoma with cracks over 48 inches deep and high shrink-swell, so seasonal wetting and drying drive movement.","url":"https://terrabrain.vercel.app/soils/tillman","section":"soils"},{"question":"Where does Tillman soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. Tillman was established in Tillman County, Oklahoma, in 1932, and its current type location is in Wilbarger County, Texas, near Lockett.","url":"https://terrabrain.vercel.app/soils/tillman#where-does-tillman-soil-occur","section":"soils","topic":"Tillman soil"},{"question":"What are the key properties of Tillman soil?","answer":"\"Vertic\" in the classification means the soil shows strong shrink-swell features such as deep cracks; Tillman was reclassified from Typic to Vertic Paleustolls in 2000. Some profiles also show a few slickensides, polished faces formed when swelling clay shears against itself.","url":"https://terrabrain.vercel.app/soils/tillman#what-are-the-key-properties-of-tillman-soil","section":"soils","topic":"Tillman soil"},{"question":"Tillman soil: What do these properties mean for foundations?","answer":"The coefficient of linear extensibility (COLE) is the change in length of a soil clod from moist to oven-dry; times 100 it is linear extensibility percent.","url":"https://terrabrain.vercel.app/soils/tillman#what-do-these-properties-mean-for-foundations","section":"soils","topic":"Tillman soil"},{"question":"Is Tillman soil expansive?","answer":"Yes. The official description gives Tillman a coefficient of linear extensibility above 0.06 in the upper 40 inches and cracks more than 48 inches deep, which places it in the high shrink-swell range.","url":"https://terrabrain.vercel.app/soils/tillman#faq-1","section":"soils","topic":"Tillman soil"},{"question":"Where is Tillman soil found?","answer":"Tillman occurs in western Oklahoma and northwest Texas on old alluvial terraces of the Rolling Red Plains. The series was established in Tillman County, Oklahoma, in 1932.","url":"https://terrabrain.vercel.app/soils/tillman#faq-2","section":"soils","topic":"Tillman soil"},{"question":"Why does Tillman soil crack so deeply?","answer":"Its clayey subsoil shrinks as it dries, and the region's mean rainfall is only about 26 inches a year, so the soil goes through long dry spells that open deep cracks.","url":"https://terrabrain.vercel.app/soils/tillman#faq-3","section":"soils","topic":"Tillman soil"},{"question":"How can I check whether my lot is Tillman soil?","answer":"Web Soil Survey, the free USDA soil map, shows mapped soil units and their rated shrink-swell for any address. A site investigation confirms the actual soil.","url":"https://terrabrain.vercel.app/soils/tillman#faq-4","section":"soils","topic":"Tillman soil"},{"question":"What is Tivoli soil and how does it affect Oklahoma foundations?","answer":"Tivoli is very deep, excessively drained dune sand in northwestern Oklahoma with no clay subsoil, so loose sand, not shrink-swell, is the main concern.","url":"https://terrabrain.vercel.app/soils/tivoli","section":"soils"},{"question":"Where does Tivoli soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. Tivoli was established in Major County, Oklahoma, in 1936, and its type location is about 2.5 miles northeast of Woodward in Woodward County.","url":"https://terrabrain.vercel.app/soils/tivoli#where-does-tivoli-soil-occur","section":"soils","topic":"Tivoli soil"},{"question":"What are Tivoli soil's key properties?","answer":"\"Psamments\" are sandy soils with little horizon development. Tivoli has no B horizon; a sandy surface layer sits on sandy C layers, in places with a transitional AC layer between. \"Single grain\" means the sand grains do not stick together into clods.","url":"https://terrabrain.vercel.app/soils/tivoli#what-are-tivoli-soil-s-key-properties","section":"soils","topic":"Tivoli soil"},{"question":"What does Tivoli soil mean for foundations?","answer":"NRCS rates shrink-swell by linear extensibility, with under 3 percent classed as low. Tivoli has no clay-rich layer at all, so it lacks the material that drives seasonal swelling. The rated value for a map unit is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/tivoli#what-does-tivoli-soil-mean-for-foundations","section":"soils","topic":"Tivoli soil"},{"question":"What kind of soil is Tivoli?","answer":"Tivoli is deep dune sand. Its profile is sand, fine sand, loamy sand or loamy fine sand from top to bottom, with no clay-rich subsoil.","url":"https://terrabrain.vercel.app/soils/tivoli#faq-1","section":"soils","topic":"Tivoli soil"},{"question":"Does Tivoli soil shrink and swell?","answer":"Tivoli is a sandy soil without a clay layer, so it does not have the clay content that drives shrink-swell. The rated linear extensibility for a map unit is listed in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/tivoli#faq-2","section":"soils","topic":"Tivoli soil"},{"question":"Where is Tivoli soil found?","answer":"Tivoli occurs on dunes along river valleys in western Oklahoma, Kansas and Texas. Its type location is northeast of Woodward, and the series was established in Major County, Oklahoma.","url":"https://terrabrain.vercel.app/soils/tivoli#faq-3","section":"soils","topic":"Tivoli soil"},{"question":"How fast does water drain through Tivoli soil?","answer":"Very fast. The official description rates Tivoli as excessively drained with rapid permeability.","url":"https://terrabrain.vercel.app/soils/tivoli#faq-4","section":"soils","topic":"Tivoli soil"},{"question":"What is Ulysses soil and is it still mapped in Oklahoma?","answer":"Ulysses is a deep, well-drained loess soil of the High Plains; Oklahoma was removed from its mapped extent in 2016, though older reports may name it.","url":"https://terrabrain.vercel.app/soils/ulysses","section":"soils"},{"question":"Is Ulysses soil mapped in Oklahoma?","answer":"Every named U.S. soil has an Official Series Description (OSD) maintained by the USDA Natural Resources Conservation Service (NRCS).","url":"https://terrabrain.vercel.app/soils/ulysses#is-ulysses-soil-mapped-in-oklahoma","section":"soils","topic":"Ulysses soil"},{"question":"Ulysses soil: What are its key properties?","answer":"\"Torriorthentic\" is the subgroup in the name; the OSD notes it replaced the earlier Aridic Haplustolls classification in 2016. The \"Bk\" horizon is a subsoil layer with accumulated lime (calcium carbonate).","url":"https://terrabrain.vercel.app/soils/ulysses#what-are-its-key-properties","section":"soils","topic":"Ulysses soil"},{"question":"What do loess soils like Ulysses mean for foundations?","answer":"NRCS rates shrink-swell by linear extensibility: under 3 percent is low and 3 to 6 percent moderate, with damage to buildings possible above 3 percent. Ulysses is a silty soil with 19 to 34 percent clay in its control section, a silty rather than clayey texture.","url":"https://terrabrain.vercel.app/soils/ulysses#what-do-loess-soils-like-ulysses-mean-for-foundations","section":"soils","topic":"Ulysses soil"},{"question":"Is Ulysses soil still mapped in Oklahoma?","answer":"No. In a 2016 revision, NRCS removed Oklahoma from the Ulysses series extent because its major map-unit components had been removed from the state. Current soil maps for Panhandle lots show which series is now used.","url":"https://terrabrain.vercel.app/soils/ulysses#faq-1","section":"soils","topic":"Ulysses soil"},{"question":"What is Ulysses soil made of?","answer":"Ulysses formed in loess, which is wind-blown silt. It is silt loam, silty clay loam or loam with about 19 to 34 percent clay in its control section and lime starting a few inches down.","url":"https://terrabrain.vercel.app/soils/ulysses#faq-2","section":"soils","topic":"Ulysses soil"},{"question":"Where is Ulysses soil found today?","answer":"The official description lists western Kansas, western Nebraska, southeastern Wyoming, southwestern South Dakota and eastern Colorado, in the Central High Tableland.","url":"https://terrabrain.vercel.app/soils/ulysses#faq-3","section":"soils","topic":"Ulysses soil"},{"question":"How do I find which soil is under a Panhandle lot?","answer":"Web Soil Survey, the free USDA soil map, shows the currently mapped soil units for any address.","url":"https://terrabrain.vercel.app/soils/ulysses#faq-4","section":"soils","topic":"Ulysses soil"},{"question":"What is Verdigris soil and how does it affect Oklahoma foundations?","answer":"Verdigris is a very deep, well-drained silty floodplain soil with 15-33% clay; flood exposure and soft water-laid layers are the main foundation concerns.","url":"https://terrabrain.vercel.app/soils/verdigris","section":"soils"},{"question":"Where does Verdigris soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) maintains an Official Series Description (OSD) for each named soil.","url":"https://terrabrain.vercel.app/soils/verdigris#where-does-verdigris-soil-occur","section":"soils","topic":"Verdigris soil"},{"question":"Verdigris soil: What are its key properties?","answer":"\"Cumulic\" is a soil-taxonomy term for an unusually thick dark topsoil, which on flood plains typically builds up as floods add sediment. Below 40 inches, textures range from sandy loam to silty clay.","url":"https://terrabrain.vercel.app/soils/verdigris#what-are-its-key-properties","section":"soils","topic":"Verdigris soil"},{"question":"Verdigris soil: What do the properties mean for foundations?","answer":"The OSD states plainly that Verdigris soils are subject to flooding, though it does not give a frequency. Official flood hazard maps for a specific address are published through FEMA's Flood Map Service Center.","url":"https://terrabrain.vercel.app/soils/verdigris#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Verdigris soil"},{"question":"Does Verdigris soil flood?","answer":"The official description states that Verdigris soils are subject to flooding; they form on flood plains. Flood maps for a specific address are available from FEMA's Flood Map Service Center.","url":"https://terrabrain.vercel.app/soils/verdigris#faq-1","section":"soils","topic":"Verdigris soil"},{"question":"Is Verdigris soil expansive?","answer":"Verdigris is a silty soil whose control section averages 15 to 33 percent clay, so it is not a heavy clay. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/verdigris#faq-2","section":"soils","topic":"Verdigris soil"},{"question":"Where is Verdigris soil found?","answer":"Verdigris is extensive in southeastern Kansas, northeastern Oklahoma and southwestern Missouri along streams. Its type location is on the Verdigris River flood plain near Elk City, Kansas.","url":"https://terrabrain.vercel.app/soils/verdigris#faq-3","section":"soils","topic":"Verdigris soil"},{"question":"How is Verdigris different from Wynona soil?","answer":"Both form in silty alluvium on flood plains. Verdigris is well drained, while Wynona is somewhat poorly drained with a seasonal perched water table.","url":"https://terrabrain.vercel.app/soils/verdigris#faq-4","section":"soils","topic":"Verdigris soil"},{"question":"What is Vernon soil and how does it affect Oklahoma foundations?","answer":"A red clay soil with 40 to 60 percent clay over dense claystone at 20 to 40 inches; clay movement with moisture and the shallow claystone drive behavior.","url":"https://terrabrain.vercel.app/soils/vernon","section":"soils"},{"question":"Where does Vernon soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. Vernon was established in Wilbarger County, Texas, in 1902, and its type location is about 12.5 miles south-southeast of Vernon, Texas.","url":"https://terrabrain.vercel.app/soils/vernon#where-does-vernon-soil-occur","section":"soils","topic":"Vernon soil"},{"question":"Vernon soil: What are its key properties?","answer":"\"Densic\" bedrock is very dense but noncemented material; in Vernon it is red-bed claystone or dense clay, fractured at less than 4-inch spacing in its upper part. Vernon has no clay-enriched \"Bt\" layer; its subsoil is a weakly developed \"Bw\" or lime-bearing \"Bk\" layer.","url":"https://terrabrain.vercel.app/soils/vernon#what-are-its-key-properties","section":"soils","topic":"Vernon soil"},{"question":"Vernon soil: What do the properties mean for foundations?","answer":"With 40 to 60 percent clay in the soil and in the claystone below it, Vernon is a clay soil top to bottom. The OSD does not list a shrink-swell value or slickensides for Vernon.","url":"https://terrabrain.vercel.app/soils/vernon#what-do-the-properties-mean-for-foundations","section":"soils","topic":"Vernon soil"},{"question":"Is Vernon soil clay?","answer":"Yes. Vernon's subsoil is silty clay or clay with 40 to 60 percent clay, and it rests on red-bed claystone or dense clay. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/vernon#faq-1","section":"soils","topic":"Vernon soil"},{"question":"How deep is the rock under Vernon soil?","answer":"The official description puts dense red-bed claystone 20 to 40 inches below the surface. The claystone is noncemented, so it is closer to very dense clay than to hard rock.","url":"https://terrabrain.vercel.app/soils/vernon#faq-2","section":"soils","topic":"Vernon soil"},{"question":"Where is Vernon soil found?","answer":"Vernon is extensive in the Rolling Red Plains of Texas, Oklahoma and Kansas, on hillslopes, pediments and escarpments. Its type location is near Vernon in Wilbarger County, Texas.","url":"https://terrabrain.vercel.app/soils/vernon#faq-3","section":"soils","topic":"Vernon soil"},{"question":"Does water soak into Vernon soil?","answer":"Very little. The official description rates permeability as very slow and runoff as very high.","url":"https://terrabrain.vercel.app/soils/vernon#faq-4","section":"soils","topic":"Vernon soil"},{"question":"What is Woodward soil and how does it affect Oklahoma foundations?","answer":"Woodward is a well-drained silty soil with 8 to 18 percent clay over soft sandstone 20 to 40 inches down, so rock depth and runoff matter more than swell.","url":"https://terrabrain.vercel.app/soils/woodward","section":"soils"},{"question":"Where does Woodward soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. Woodward was established in Woodward County, Oklahoma, in 1944, and its type location is about a quarter mile south of Fort Supply.","url":"https://terrabrain.vercel.app/soils/woodward#where-does-woodward-soil-occur","section":"soils","topic":"Woodward soil"},{"question":"What are the key properties of Woodward soil?","answer":"The \"Cd\" layer at the base is soft sandstone or siltstone that breaks down to loamy material and has a root-restricting density.","url":"https://terrabrain.vercel.app/soils/woodward#what-are-the-key-properties-of-woodward-soil","section":"soils","topic":"Woodward soil"},{"question":"Woodward soil: What do these properties mean for foundations?","answer":"NRCS rates shrink-swell by linear extensibility, with under 3 percent classed as low and over 3 percent able to damage buildings. Woodward's control section has only 8 to 18 percent clay. The rated value for a map unit is in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/woodward#what-do-these-properties-mean-for-foundations","section":"soils","topic":"Woodward soil"},{"question":"Is Woodward soil expansive?","answer":"Woodward is a silty, loamy soil with only 8 to 18 percent clay in its control section, so it lacks the clay that drives strong shrink-swell. The rated value for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/woodward#faq-1","section":"soils","topic":"Woodward soil"},{"question":"How deep is the rock under Woodward soil?","answer":"Soft, noncemented Permian sandstone or siltstone lies 20 to 40 inches below the surface; the typical profile reaches it at about 28 inches.","url":"https://terrabrain.vercel.app/soils/woodward#faq-2","section":"soils","topic":"Woodward soil"},{"question":"Where is Woodward soil found?","answer":"Woodward covers large areas of western Oklahoma, plus parts of southern Kansas and northwestern Texas. It was established in 1944 in Woodward County, and its type location is near Fort Supply.","url":"https://terrabrain.vercel.app/soils/woodward#faq-3","section":"soils","topic":"Woodward soil"},{"question":"What rock formations does Woodward soil come from?","answer":"The official description names calcareous Permian sandstone and siltstone mainly of the Marlow and Rush Springs formations, plus the Cloud Chief and Quartermaster formations.","url":"https://terrabrain.vercel.app/soils/woodward#faq-4","section":"soils","topic":"Woodward soil"},{"question":"What is Wynona soil and how does it affect Oklahoma foundations?","answer":"Wynona is a very deep, somewhat poorly drained silty floodplain soil of eastern Oklahoma that floods occasionally and holds a perched water table near 2 feet.","url":"https://terrabrain.vercel.app/soils/wynona","section":"soils"},{"question":"Where does Wynona soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. Wynona was established in 1975 in Osage County, Oklahoma, and its type location is about 4 miles south and 1 mile west of Skiatook.","url":"https://terrabrain.vercel.app/soils/wynona#where-does-wynona-soil-occur","section":"soils","topic":"Wynona soil"},{"question":"What are Wynona soil's key properties?","answer":"\"Epiaquolls\" are dark-surfaced soils with a wet (aquic) moisture regime; in Wynona the wetness comes from a perched water table. The \"g\" in Bg stands for gleyed, the gray colors that form when soil stays saturated, and Wynona shows redox mottling in both its topsoil and subsoil.","url":"https://terrabrain.vercel.app/soils/wynona#what-are-wynona-soil-s-key-properties","section":"soils","topic":"Wynona soil"},{"question":"What does Wynona soil mean for foundations?","answer":"Wynona floods occasionally for very brief periods from January through July in normal years. FEMA's Flood Map Service Center can be searched by address for the flood map covering a lot. See creeks and flood history.","url":"https://terrabrain.vercel.app/soils/wynona#what-does-wynona-soil-mean-for-foundations","section":"soils","topic":"Wynona soil"},{"question":"Does Wynona soil flood?","answer":"Yes. The official description lists occasional flooding for very brief periods from January through July in normal years. Flood maps for an address are available from FEMA's Flood Map Service Center.","url":"https://terrabrain.vercel.app/soils/wynona#faq-1","section":"soils","topic":"Wynona soil"},{"question":"Is Wynona soil wet?","answer":"It is somewhat poorly drained, and a perched water table sits about 2 feet below the surface from November through April in normal years.","url":"https://terrabrain.vercel.app/soils/wynona#faq-2","section":"soils","topic":"Wynona soil"},{"question":"Is Wynona soil expansive?","answer":"Wynona's control section averages 27 to 35 percent clay, and its subsoil is silty clay loam or silty clay. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/wynona#faq-3","section":"soils","topic":"Wynona soil"},{"question":"Where is Wynona soil found?","answer":"Wynona occurs on flood plains in eastern Oklahoma, southeastern Kansas and southwestern Missouri. It was established in 1975 in Osage County, Oklahoma, near Skiatook.","url":"https://terrabrain.vercel.app/soils/wynona#faq-4","section":"soils","topic":"Wynona soil"},{"question":"What is Zaneis soil and how does it affect Oklahoma foundations?","answer":"Zaneis is a deep, well-drained loamy soil on central Oklahoma hills over Permian sandstone and shale at 40 to 60 inches; runoff and drainage matter most.","url":"https://terrabrain.vercel.app/soils/zaneis","section":"soils"},{"question":"Where does Zaneis soil occur?","answer":"The USDA Natural Resources Conservation Service (NRCS) keeps an Official Series Description (OSD) for each named soil. Zaneis was established in Carter County, Oklahoma, in 1932, and its type location is about 1 mile east and 5 miles north of Edmond in Oklahoma County.","url":"https://terrabrain.vercel.app/soils/zaneis#where-does-zaneis-soil-occur","section":"soils","topic":"Zaneis soil"},{"question":"Zaneis soil: What are its key properties?","answer":"The \"Bt\" horizon is a subsoil layer where clay has built up over time; in Zaneis it runs from about 19 to 55 inches. \"Cr\" marks weakly consolidated bedrock; in Zaneis it is rated as having high or very high excavation difficulty.","url":"https://terrabrain.vercel.app/soils/zaneis#what-are-its-key-properties","section":"soils","topic":"Zaneis soil"},{"question":"Zaneis soil: What do its properties mean for foundations?","answer":"NRCS rates shrink-swell by linear extensibility: under 3 percent is low, 3 to 6 percent moderate, and values above 3 percent can damage buildings. Zaneis has a loamy rather than clayey subsoil, and its OSD records no cracking or slickensides.","url":"https://terrabrain.vercel.app/soils/zaneis#what-do-its-properties-mean-for-foundations","section":"soils","topic":"Zaneis soil"},{"question":"Is Zaneis soil expansive?","answer":"Zaneis's subsoil is clay loam or sandy clay loam with about 18 to 38 percent clay, so it is a loamy soil rather than a heavy clay. The rated shrink-swell for a map unit is listed as linear extensibility in Web Soil Survey.","url":"https://terrabrain.vercel.app/soils/zaneis#faq-1","section":"soils","topic":"Zaneis soil"},{"question":"How deep is the rock under Zaneis soil?","answer":"Bedrock of weakly consolidated sandstone and sandy shale lies 40 to 60 inches below the surface; the typical profile reaches it at about 59 inches.","url":"https://terrabrain.vercel.app/soils/zaneis#faq-2","section":"soils","topic":"Zaneis soil"},{"question":"Where is Zaneis soil found?","answer":"Zaneis is extensive in the Central Rolling Red Prairies of central Oklahoma. Its type location is north of Edmond in Oklahoma County, and the series was established in Carter County in 1932.","url":"https://terrabrain.vercel.app/soils/zaneis#faq-3","section":"soils","topic":"Zaneis soil"},{"question":"Does Zaneis soil have runoff problems?","answer":"Runoff is low on nearly level ground but rated high on 1 to 5 percent slopes and very high on 5 to 8 percent slopes.","url":"https://terrabrain.vercel.app/soils/zaneis#faq-4","section":"soils","topic":"Zaneis soil"},{"question":"What must Oklahoma home inspectors report about foundations?","answer":"Oklahoma inspectors must inspect the foundation, describe signs of movement and recommend correction, evaluation or monitoring, but need not find the cause.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate","section":"data"},{"question":"Who regulates home inspectors in Oklahoma?","answer":"Home inspection in Oklahoma is regulated under Title 158, Chapter 70 of the Oklahoma Administrative Code.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#who-regulates-home-inspectors-in-oklahoma","section":"data","topic":"Inspector foundation duties"},{"question":"What must inspectors check?","answer":"Under OAC 158:70-1-3, the structural part of a home inspection covers:","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#what-must-inspectors-check","section":"data","topic":"Inspector foundation duties"},{"question":"What are inspectors not required to do?","answer":"The same standard lists limits on the inspection:","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#what-are-inspectors-not-required-to-do","section":"data","topic":"Inspector foundation duties"},{"question":"What must Oklahoma sellers disclose about foundations?","answer":"The Residential Property Condition Disclosure Act applies to homes with one or two dwelling units.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#what-must-oklahoma-sellers-disclose-about-foundations","section":"data","topic":"Inspector foundation duties"},{"question":"What time limits apply to foundation and construction claims?","answer":"A statute of repose is an outer deadline that runs from completion of the work, regardless of when damage is discovered.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#what-time-limits-apply-to-foundation-and-construction-claims","section":"data","topic":"Inspector foundation duties"},{"question":"Inspector foundation duties: What consumer protections apply to in-home sales?","answer":"Cancellation: The federal Cooling-Off Rule gives buyers until midnight of the third business day to cancel many sales made at their home, and the seller must explain this right and provide cancellation forms at the time of sale; Deceptive practices: Oklahoma's Consumer Protection Act lists unlawful practices, including falsely claiming that services or repairs are needed.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#what-consumer-protections-apply-to-in-home-sales","section":"data","topic":"Inspector foundation duties"},{"question":"Inspector foundation duties: Who licenses contractors, and are permits needed?","answer":"The Construction Industries Board regulates plumbers, electricians, mechanical tradespeople, home inspectors, building inspectors and roofing. General contracting and foundation repair are not on that list.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#who-licenses-contractors-and-are-permits-needed","section":"data","topic":"Inspector foundation duties"},{"question":"Inspector foundation duties: What happens after the inspection?","answer":"Home inspectors identify signs of movement but are not required to determine causes or perform engineering services.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#what-happens-after-the-inspection","section":"data","topic":"Inspector foundation duties"},{"question":"Does an Oklahoma home inspector have to report foundation problems?","answer":"Yes. Oklahoma's standards require inspectors to inspect the foundation and describe indicators of foundation or structural movement, and to recommend correction, further evaluation or monitoring of reported conditions.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#faq-1","section":"data","topic":"Inspector foundation duties"},{"question":"Will a home inspector tell me what caused the foundation movement?","answer":"Not necessarily. The Oklahoma standards say inspectors are not required to determine the causes of any condition or defect, or the methods or materials for repair.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#faq-2","section":"data","topic":"Inspector foundation duties"},{"question":"Does a home inspector have to go into the crawl space?","answer":"Inspectors must enter the crawl space or state how it was observed, but entry is not required if headroom is under 18 inches, the access opening is smaller than 18 by 24 inches, or the space is excessively wet or hazardous.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#faq-3","section":"data","topic":"Inspector foundation duties"},{"question":"Who licenses home inspectors in Oklahoma?","answer":"The Construction Industries Board. No one may perform or advertise home inspection work without a valid license from the Board unless legally exempt.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#faq-4","section":"data","topic":"Inspector foundation duties"},{"question":"How long does an Oklahoma buyer have to sue over an undisclosed foundation defect?","answer":"Under the Residential Property Condition Disclosure Act, a purchaser's action must be brought within two years after the date of transfer, and the remedy is actual damages such as repair costs.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#faq-5","section":"data","topic":"Inspector foundation duties"},{"question":"Inspector foundation duties: Is there a time limit on construction defect claims in Oklahoma?","answer":"Yes. Oklahoma's statute of repose bars tort claims over design or construction deficiencies in an improvement to real property brought more than ten years after substantial completion.","url":"https://terrabrain.vercel.app/data/legal-and-real-estate#faq-6","section":"data","topic":"Inspector foundation duties"},{"question":"What permits, licensing and frost depth apply in Oklahoma?","answer":"Oklahoma leaves frost depth to each city or county, with published values about 18 inches, and does not license foundation repair as a trade.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities","section":"rules"},{"question":"Permits, licensing, frost depth: What is the statewide code framework?","answer":"The 2024 International Residential Code (IRC) with Oklahoma amendments is the statewide minimum residential code as of September 14, 2026. It replaced the 2018 IRC, which had been in effect since September 14, 2022.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#what-is-the-statewide-code-framework","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"What frost depth values are used?","answer":"For any specific address, the local building department's adopted climate table is the controlling value.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#what-frost-depth-values-are-used","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: What did the engineering board warn about?","answer":"At a 2007 public meeting, Oklahoma's engineering board described common shallow \"pier and grade beam\" foundations: piers 8 to 10 inches across, no more than about 36 inches deep and 6 to 8 feet apart, with grade beam bottoms often only 1 to 8 inches below finished grade.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#what-did-the-engineering-board-warn-about","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: Is foundation repair a licensed trade?","answer":"State. The Construction Industries Board licenses plumbers, electricians, mechanical contractors, home inspectors and building inspectors, and registers roofing contractors.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#is-foundation-repair-a-licensed-trade","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: Do you need a permit for foundation repair?","answer":"Because published guidance is thin, the local permit desk is the authority on whether underpinning needs a permit, an engineer's letter or inspections.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#do-you-need-a-permit-for-foundation-repair","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: When are engineer letters used?","answer":"Oklahoma's engineering board published compliance guidelines for foundation repair companies and warned that anyone violating them may be in violation of the state engineering licensure law (Title 59, Section 475.1 et seq.) and board rules (OAC 245:15). Under the guidelines:","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#when-are-engineer-letters-used","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"What is the frost depth in Oklahoma?","answer":"Oklahoma's statewide code leaves frost depth for each jurisdiction to set. Stillwater publishes 18 inches, and Oklahoma's engineering board has cited about 18 inches below finished grade for Oklahoma City.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#faq-1","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: Does Oklahoma have a state license for foundation repair contractors?","answer":"Foundation repair is not among the trades the Construction Industries Board licenses or registers, which are plumbing, electrical, mechanical, home and building inspection, and roofing.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#faq-2","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: Do contractors have to register with Oklahoma City?","answer":"Yes, for work that requires a building permit. Oklahoma City requires building contractor registration with general liability insurance of at least $50,000 per occurrence and workers' compensation coverage or an exemption form.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#faq-3","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: Who can pull a building permit in Tulsa?","answer":"Tulsa accepts building permit applications from the owner, contractor, architect or the owner's authorized agent; electrical, mechanical and plumbing permits require licensed contractors.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#faq-4","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Permits, licensing, frost depth: Does the building code require a permit for foundation repair?","answer":"The model IRC requires a permit to construct, enlarge, alter or repair a building, and foundation repair is not on its list of exempt work. Cities can amend those rules, so the local permit desk decides.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#faq-5","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"Why does frost depth matter for foundations?","answer":"Codes require the bottom of footings and grade beams to sit below the local frost depth unless perimeter insulation is used, so that freezing soil does not lift them.","url":"https://terrabrain.vercel.app/rules/permits-licensing-and-frost-depth-oklahoma-cities#faq-6","section":"rules","topic":"Permits, licensing, frost depth"},{"question":"What safety rules apply to foundation repair work in Oklahoma?","answer":"Federal OSHA rules cover trench protection, excavation inspections and silica dust from concrete cutting; heat and crawl spaces add other hazards.","url":"https://terrabrain.vercel.app/rules/safety-and-osha","section":"rules"},{"question":"What rules apply to excavations and trenches?","answer":"Exterior piers are installed from holes dug beside the foundation.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#what-rules-apply-to-excavations-and-trenches","section":"rules","topic":"Foundation repair safety rules"},{"question":"What rules apply to concrete cutting and silica dust?","answer":"Interior piers and slab repairs often require cutting or coring concrete, which releases respirable crystalline silica, a fine dust that can damage lungs. OSHA's construction silica standard:","url":"https://terrabrain.vercel.app/rules/safety-and-osha#what-rules-apply-to-concrete-cutting-and-silica-dust","section":"rules","topic":"Foundation repair safety rules"},{"question":"Foundation repair safety rules: What are the hazards in crawl spaces?","answer":"Crawl spaces can be tight, wet and hazardous. Oklahoma's home inspection standards do not require inspectors to enter a crawl space with less than 18 inches of headroom, an access opening smaller than 18 by 24 inches, excessive wetness or hazardous conditions.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#what-are-the-hazards-in-crawl-spaces","section":"rules","topic":"Foundation repair safety rules"},{"question":"Foundation repair safety rules: How is summer heat handled?","answer":"Oklahoma summers are when much repair work happens. The U.S. Department of Labor's heat illness campaign centers on \"Water. Rest. Shade.\" and on acclimatization, letting workers build tolerance to heat gradually.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#how-is-summer-heat-handled","section":"rules","topic":"Foundation repair safety rules"},{"question":"Why are post-tensioned slabs a safety concern?","answer":"Some slabs are reinforced with tensioned steel cables (tendons) rather than ordinary rebar. How to tell and what that means for cutting or coring is covered on the post-tensioned slabs page.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#why-are-post-tensioned-slabs-a-safety-concern","section":"rules","topic":"Foundation repair safety rules"},{"question":"When does a foundation repair trench need shoring?","answer":"OSHA requires a protective system such as sloping, shoring or a trench box for workers in an excavation unless it is entirely in stable rock, or less than 5 feet deep and a competent person finds no sign of a possible cave-in.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#faq-1","section":"rules","topic":"Foundation repair safety rules"},{"question":"Foundation repair safety rules: How often must an excavation be inspected?","answer":"A competent person must inspect it daily, before work starts, as needed during the shift, and after every rainstorm or other event that increases hazards.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#faq-2","section":"rules","topic":"Foundation repair safety rules"},{"question":"Foundation repair safety rules: Is concrete dust from cutting a slab regulated?","answer":"Yes. OSHA's construction silica standard limits respirable crystalline silica to 50 micrograms per cubic meter over 8 hours and lists water or dust-collection controls for saws, drills and jackhammers.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#faq-3","section":"rules","topic":"Foundation repair safety rules"},{"question":"Foundation repair safety rules: What does OSHA recommend for working in Oklahoma summer heat?","answer":"OSHA's heat campaign centers on water, rest and shade, and on acclimatization, since workers new to the heat are at highest risk.","url":"https://terrabrain.vercel.app/rules/safety-and-osha#faq-4","section":"rules","topic":"Foundation repair safety rules"},{"question":"What should an Oklahoma foundation repair contract cover?","answer":"Scope of work, what lift means, exclusions and drainage duties afterward. Many in-home sales allow 3-day cancellation, and Oklahoma liens have strict deadlines.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens","section":"rules"},{"question":"Contracts, warranties and liens: What can a repair contract spell out?","answer":"Topics that a written foundation repair contract can address include: - Scope: number and location of piers (see loads, pier spacing and capacity), repair method, and how depth beyond an estimate is handled.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#what-can-a-repair-contract-spell-out","section":"rules","topic":"Contracts, warranties and liens"},{"question":"Contracts, warranties and liens: How does the FTC 3-day Cooling-Off Rule apply?","answer":"For covered sales made at a buyer's home, workplace or a seller's temporary location, the buyer can cancel for a full refund until midnight of the third business day after the sale.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#how-does-the-ftc-3-day-cooling-off-rule-apply","section":"rules","topic":"Contracts, warranties and liens"},{"question":"Do foundation warranties carry over when a house is sold?","answer":"Oklahoma's seller disclosure form asks, \"Are you aware of any previous foundation repairs?\" and also asks about warranties covering the property, naming foundation warranties as an example.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#do-foundation-warranties-carry-over-when-a-house-is-sold","section":"rules","topic":"Contracts, warranties and liens"},{"question":"How do Oklahoma mechanic's liens work?","answer":"A mechanic's lien is a legal claim against the property filed by someone who supplied labor or materials and was not paid. Oklahoma's rules under Title 42:","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#how-do-oklahoma-mechanic-s-liens-work","section":"rules","topic":"Contracts, warranties and liens"},{"question":"Contracts, warranties and liens: Can I cancel a foundation repair contract I signed at my house?","answer":"The FTC Cooling-Off Rule generally lets buyers cancel covered sales made at home until midnight of the third business day, but it does not cover sales made because the buyer asked the seller to come to the home to repair or maintain the buyer's personal property, except for extra items bought beyond that request.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#faq-1","section":"rules","topic":"Contracts, warranties and liens"},{"question":"Contracts, warranties and liens: How long does a contractor have to file a lien on my house in Oklahoma?","answer":"An original contractor that contracted with the owner must file within four months after the last labor or materials, and a subcontractor within 90 days, under Title 42 of the Oklahoma Statutes.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#faq-2","section":"rules","topic":"Contracts, warranties and liens"},{"question":"Contracts, warranties and liens: What is a pre-lien notice in Oklahoma?","answer":"It is a notice a lien claimant must send to the original contractor and the owner no later than 75 days after last supplying work or materials, before filing a lien; on owner-occupied homes it applies regardless of the claim amount.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#faq-3","section":"rules","topic":"Contracts, warranties and liens"},{"question":"Contracts, warranties and liens: Do I need to tell buyers about a foundation warranty?","answer":"Oklahoma's seller disclosure form asks whether the seller knows of previous foundation repairs and whether any warranties cover the property, naming foundation warranties as an example.","url":"https://terrabrain.vercel.app/rules/contracts-warranties-liens#faq-4","section":"rules","topic":"Contracts, warranties and liens"},{"question":"What soil types are in the Oklahoma City metro?","answer":"Mostly soils from Permian red shale, claystone and sandstone. Clay-rich Renfrow and Kirkland shrink and swell strongly; sandy Dougherty and Lucien move less.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro","section":"guides"},{"question":"How is a soil series description read?","answer":"A soil series is a named soil type that the USDA describes in an Official Series Description (OSD): its layers, clay content, drainage and parent material (the rock or sediment it formed from). OSDs don't give a single \"shrink-swell rating,\" but several details point to it:","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#how-is-a-soil-series-description-read","section":"guides","topic":"OKC metro soil series"},{"question":"What are the major OKC metro soil series?","answer":"An Oklahoma State University study of benchmark soils found Kirkland's subsoil liquid limit exceeded 50% with high plasticity indices and described it as highly expansive, with a severe rating for low buildings.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#what-are-the-major-okc-metro-soil-series","section":"guides","topic":"OKC metro soil series"},{"question":"OKC metro soil series: What does this mean for foundations?","answer":"Clay-rich series are the ones most associated with perimeter settlement in drought and heave when they rewet; Where soft rock is shallow, as in Lucien and Vernon, the depth of soil that can change volume is limited by the rock below; The underlying rock units are described on the Hennessey Shale and Garber Sandstone pages.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#what-does-this-mean-for-foundations","section":"guides","topic":"OKC metro soil series"},{"question":"What kind of soil is in Oklahoma City?","answer":"Much of the OKC metro has soils formed from Permian red shale and sandstone. Clay-rich series such as Renfrow and Kirkland sit beside sandier series such as Zaneis, Lucien and Dougherty.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#faq-1","section":"guides","topic":"OKC metro soil series"},{"question":"Which OKC soils have the most shrink-swell?","answer":"Renfrow and Kirkland are clay-rich and show signs of strong shrink-swell, such as slickensides and seasonal cracking. A 1978 Oklahoma State University study found Kirkland highly expansive, with Bethany in the moderate range.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#faq-2","section":"guides","topic":"OKC metro soil series"},{"question":"Which OKC-area soils are on flood plains?","answer":"Port, Pulaski and Dale formed in loamy stream sediment on flood plains. The official descriptions for Port and Pulaski list occasional or frequent flooding for very brief periods from March to October.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#faq-3","section":"guides","topic":"OKC metro soil series"},{"question":"How deep is rock under Oklahoma City soils?","answer":"It varies by series. Lucien reaches rippable sandstone in 10 to 20 inches, Vernon has dense claystone at 20 to 40 inches, and Renfrow, Kirkland and Bethany are more than 60 inches deep.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#faq-4","section":"guides","topic":"OKC metro soil series"},{"question":"How do I find which soil is under my house?","answer":"The USDA soil survey maps soil series by location, but city lots are often graded or filled, so on-site samples or borings are the only way to confirm what is actually under a foundation.","url":"https://terrabrain.vercel.app/guides/soil-series-okc-metro#faq-5","section":"guides","topic":"OKC metro soil series"},{"question":"What soil types are in the Tulsa metro and how do they behave?","answer":"Tulsa soils formed mostly from shale and sandstone. Shale soils are clayey and can shrink and swell; sandstone soils on hills are loamy and shallow to rock.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro","section":"guides"},{"question":"How are the official soil descriptions read?","answer":"Each soil series has a USDA Official Series Description (OSD) listing its layers, clay content, drainage and parent material (what it weathered from). Terms used below:","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#how-are-the-official-soil-descriptions-read","section":"guides","topic":"Tulsa metro soil types"},{"question":"How do clay soils formed from shale behave?","answer":"Dennis has its type location just north of Claremore in Rogers County. Okemah's subsoil is very firm when moist and has a few slickensides. Parsons has an abrupt change at about 12 inches, where a loamy surface layer sits on a clayey subsoil.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#how-do-clay-soils-formed-from-shale-behave","section":"guides","topic":"Tulsa metro soil types"},{"question":"How do sandstone soils on the hills behave?","answer":"Bates, Collinsville and Coweta formed from Pennsylvanian sandstone. Coweta, with a type location in Wagoner County, has only 10 to 20 inches of soil over soft sandstone.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#how-do-sandstone-soils-on-the-hills-behave","section":"guides","topic":"Tulsa metro soil types"},{"question":"Which soils are on Tulsa-area flood plains?","answer":"Wynona, Verdigris and Osage formed in alluvium (sediment laid down by streams) on flood plains.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#which-soils-are-on-tulsa-area-flood-plains","section":"guides","topic":"Tulsa metro soil types"},{"question":"Tulsa metro soil types: How does perched water affect foundations?","answer":"Dennis, Okemah, Parsons, Summit, Taloka, Choteau, Wynona and Apperson all list a seasonal perched water table in late fall through spring. That timing lines up with wet crawl spaces and water at basement cove joints described on the groundwater and perched water page.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#how-does-perched-water-affect-foundations","section":"guides","topic":"Tulsa metro soil types"},{"question":"What kind of soil is in Tulsa?","answer":"Most upland soils around Tulsa formed from Pennsylvanian-age shale and sandstone. Shale-derived soils such as Dennis, Okemah, Parsons and Summit are clayey, while sandstone-derived soils such as Bates and Collinsville are loamy and shallow to rock.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#faq-1","section":"guides","topic":"Tulsa metro soil types"},{"question":"Why do Tulsa yards and crawl spaces stay wet in spring?","answer":"Several common Tulsa-area soils have a perched water table, a temporary layer of saturated soil sitting on denser clay, from late fall or winter into spring. Parsons, for example, can have perched water 6 to 18 inches down from December through April.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#faq-2","section":"guides","topic":"Tulsa metro soil types"},{"question":"Which Tulsa soils shrink and swell the most?","answer":"Summit and Osage are smectitic clays, a clay type prone to swelling. Summit's description notes deep, wide cracks that usually form in summer, and Osage has intersecting slickensides from repeated swelling and shrinking.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#faq-3","section":"guides","topic":"Tulsa metro soil types"},{"question":"Which Tulsa-area soils flood?","answer":"Flood-plain soils such as Wynona, Verdigris and Osage formed in stream sediment. Wynona's official description lists occasional very brief flooding from January through July and perched water about 2 feet down from November through April.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#faq-4","section":"guides","topic":"Tulsa metro soil types"},{"question":"Is bedrock shallow in Tulsa?","answer":"On sandstone hills it often is. Collinsville reaches hard sandstone within about 4 to 20 inches and Bates within 20 to 40 inches, while shale-derived soils such as Dennis and Summit are more than 60 inches deep.","url":"https://terrabrain.vercel.app/guides/soil-series-tulsa-metro#faq-5","section":"guides","topic":"Tulsa metro soil types"},{"question":"What soils affect foundations in east-central Oklahoma?","answer":"A wet region of shale, sandstone ridges and floodplains; many soils hold a seasonal high water table, and floodplain clays such as Osage are smectitic Vertisols.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma","section":"regions"},{"question":"East-central Oklahoma: What is the climate like?","answer":"USDA descriptions for the region's soils list mean annual precipitation of roughly 35 to 47 inches, with typical values near 39 to 41 inches, and mean annual temperatures of about 55 to 64 °F.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma#what-is-the-climate-like","section":"regions","topic":"East-central Oklahoma"},{"question":"East-central Oklahoma: What is the ground made of?","answer":"Much of the region is underlain by Pennsylvanian shales with thin sandstone and siltstone layers.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma#what-is-the-ground-made-of","section":"regions","topic":"East-central Oklahoma"},{"question":"East-central Oklahoma: What foundation problems are common?","answer":"Perimeter wetting heave where shale clays stay wet through winter and spring; Crawl space moisture and wood decay under homes on soils with shallow seasonal water; Slope creep on steeper shale hillsides.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma#what-foundation-problems-are-common","section":"regions","topic":"East-central Oklahoma"},{"question":"East-central Oklahoma: Why are soils around Muskogee and Okmulgee often wet in spring?","answer":"Several common soils formed from Pennsylvanian shale have a seasonal high or perched water table within about 1 to 3 feet of the surface in winter and spring, according to USDA soil descriptions.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma#faq-1","section":"regions","topic":"East-central Oklahoma"},{"question":"Which east-central Oklahoma soils swell the most?","answer":"Floodplain clays such as Osage are classified as Vertisols, with smectitic clay and continuous slickensides from about 13 to 60 inches deep.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma#faq-2","section":"regions","topic":"East-central Oklahoma"},{"question":"How much rain falls in east-central Oklahoma?","answer":"USDA descriptions for the region's soils give mean annual precipitation of roughly 35 to 47 inches, with typical values around 39 to 41 inches.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma#faq-3","section":"regions","topic":"East-central Oklahoma"},{"question":"Are landslides a concern in eastern Oklahoma?","answer":"The Oklahoma Geological Survey reports that most of the state's landslides occur in the eastern third, where the climate is wetter and the terrain steeper.","url":"https://terrabrain.vercel.app/regions/east-central-arkoma#faq-4","section":"regions","topic":"East-central Oklahoma"},{"question":"What soils affect foundations in the Oklahoma Panhandle?","answer":"The driest region, about 17 to 18 inches of rain in the west; soils formed in wind-deposited loess, and some, like Richfield, have clay subsoils that swell.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains","section":"regions"},{"question":"Oklahoma Panhandle: What is the climate like?","answer":"Oklahoma's climate grades from humid subtropical in the east to semi-arid in the west, and annual precipitation drops to about 17 inches in the far western Panhandle.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains#what-is-the-climate-like","section":"regions","topic":"Oklahoma Panhandle"},{"question":"Oklahoma Panhandle: What is the ground made of?","answer":"Loess is silt deposited by wind. Richfield soils are very deep, well drained soils formed in calcareous loess about 3 to more than 10 feet thick, on nearly level tablelands with slopes of 0 to 6 percent. Their subsoil contains 35 to 42 percent clay and is classified as smectitic.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains#what-is-the-ground-made-of","section":"regions","topic":"Oklahoma Panhandle"},{"question":"Oklahoma Panhandle: What foundation problems are common?","answer":"Hydrocollapse — some dry, loose wind-deposited soils can compact suddenly when first soaked; see collapsible and loess soils; Swelling on wetting in smectitic clay subsoils such as Richfield, especially near lawn irrigation, leaks or ponding; Frost heave of shallow footings and flatwork in colder winters.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains#what-foundation-problems-are-common","section":"regions","topic":"Oklahoma Panhandle"},{"question":"How dry is the Oklahoma Panhandle?","answer":"It is the driest part of the state. Statewide research notes annual precipitation of about 17 inches in the far western Panhandle, and USDA descriptions for Panhandle soils give typical values near 18 inches.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains#faq-1","section":"regions","topic":"Oklahoma Panhandle"},{"question":"Oklahoma Panhandle: What is loess?","answer":"Loess is silt-sized sediment deposited by wind. In the Panhandle, Richfield soils formed in calcareous loess 3 to more than 10 feet thick on flat tablelands.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains#faq-2","section":"regions","topic":"Oklahoma Panhandle"},{"question":"Do Panhandle soils shrink and swell?","answer":"Some do. Richfield soils have 35 to 42 percent clay in the subsoil with smectitic mineralogy, a clay family with high shrink-swell potential. Sandier soils formed in wind-blown sediments, such as Dalhart, have less clay.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains#faq-3","section":"regions","topic":"Oklahoma Panhandle"},{"question":"Why does it matter that Panhandle soils are so dry?","answer":"Soils that stay dry for long periods can react strongly when they are wetted by irrigation, leaks or poor drainage, through swelling in clay or compaction in some loose wind-deposited soils.","url":"https://terrabrain.vercel.app/regions/panhandle-high-plains#faq-4","section":"regions","topic":"Oklahoma Panhandle"},{"question":"What soils cause foundation problems in north-central Oklahoma?","answer":"Red prairie clays over Permian shale, such as Renfrow, Kirkland and Tabler, shrink and swell strongly, while loamy Pond Creek and Grant soils are less reactive.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt","section":"regions"},{"question":"North-central Oklahoma soils: What is the climate like?","answer":"USDA soil descriptions for the region list mean annual precipitation from roughly 26 to 38 inches and mean annual temperatures of about 57 to 64 °F.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt#what-is-the-climate-like","section":"regions","topic":"North-central Oklahoma soils"},{"question":"North-central Oklahoma soils: What is the ground made of?","answer":"The region is mapped by USDA as Major Land Resource Area 80A, the Central Rolling Red Prairies.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt#what-is-the-ground-made-of","section":"regions","topic":"North-central Oklahoma soils"},{"question":"North-central Oklahoma soils: What are the common foundation problems?","answer":"Perimeter drying settlement on Renfrow, Kirkland and Tabler clays during drought; Tree-root desiccation settlement where trees grow close to homes on these clays; Heave when dried clays rewet after drought or tree removal.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt#what-are-the-common-foundation-problems","section":"regions","topic":"North-central Oklahoma soils"},{"question":"What soils cause foundation movement around Enid and Ponca City?","answer":"Clay soils of the Central Rolling Red Prairies, such as Renfrow, Kirkland and Tabler, have vertic or vertic-like properties including cracking and slickensides, which indicate strong shrink-swell behavior.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt#faq-1","section":"regions","topic":"North-central Oklahoma soils"},{"question":"Are all soils in north-central Oklahoma high shrink-swell?","answer":"No. Soils such as Pond Creek, Grant and Kingfisher are loamy, formed in silty material or siltstone and shale, and their USDA descriptions do not list vertic properties.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt#faq-2","section":"regions","topic":"North-central Oklahoma soils"},{"question":"How much rain falls in north-central Oklahoma?","answer":"USDA descriptions for the region's main soils list mean annual precipitation of roughly 26 to 38 inches, with typical values in the low to mid 30s.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt#faq-3","section":"regions","topic":"North-central Oklahoma soils"},{"question":"North-central Oklahoma soils: What is a slickenside?","answer":"A slickenside is a polished, grooved surface inside a clay soil, formed when the clay swells and blocks of soil shear past each other. It is a field sign of high shrink-swell clay.","url":"https://terrabrain.vercel.app/regions/north-central-red-prairies-and-wheat-belt#faq-4","section":"regions","topic":"North-central Oklahoma soils"},{"question":"What soils cause foundation problems in northeast Oklahoma?","answer":"Cherty Ozark soils and karst around Grand Lake, Grove and Tahlequah, plus shrink-swell shale clays and perched water toward Vinita and Pryor.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake","section":"regions"},{"question":"Northeast Oklahoma soils: What is the climate like?","answer":"USDA descriptions for the region's soils give mean annual precipitation of about 35 to 47 inches, with typical values in the low 40s, and mean annual temperatures of about 54 to 65 °F.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake#what-is-the-climate-like","section":"regions","topic":"Northeast Oklahoma soils"},{"question":"Northeast Oklahoma soils: What is the ground like?","answer":"USDA places these soils in the Ozark Highlands and Ozark land resource areas, whose range includes Oklahoma. The bedrock is described on Mississippian cherty limestone.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake#what-is-the-ground-like","section":"regions","topic":"Northeast Oklahoma soils"},{"question":"Northeast Oklahoma soils: What are the common foundation problems?","answer":"Crawl space moisture and wood decay where perched water and high rainfall keep soil wet; Perimeter wetting heave and seasonal movement on Summit and Osage clays; Slope creep and erosion on steep Ozark hillsides. Most Oklahoma landslides occur in the eastern third of the state.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake#what-are-the-common-foundation-problems","section":"regions","topic":"Northeast Oklahoma soils"},{"question":"What makes Ozark soils near Grand Lake different for foundations?","answer":"Ozark soils such as Clarksville and Nixa formed from cherty limestone or dolomite and contain large amounts of chert gravel, often 35 to 80 percent by volume in parts of the profile. They are on hilly ground with slopes up to 35 to 70 percent.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake#faq-1","section":"regions","topic":"Northeast Oklahoma soils"},{"question":"Does northeast Oklahoma have sinkholes?","answer":"The Oklahoma Geological Survey reports limestone and dolomite karst mainly in the Ozark region, among other areas. Karst forms where groundwater dissolves soluble rock, creating caverns and sinkholes.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake#faq-2","section":"regions","topic":"Northeast Oklahoma soils"},{"question":"Are there expansive clays in northeast Oklahoma?","answer":"Yes, especially on the prairie side toward Vinita and Pryor. The Summit series, formed from Pennsylvanian shale, has smectitic clay, slickensides and deep, wide cracks that form in summer.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake#faq-3","section":"regions","topic":"Northeast Oklahoma soils"},{"question":"Why do some northeast Oklahoma yards stay soggy in spring?","answer":"Soils such as Parsons have a perched water table 6 to 18 inches below the surface from about December through April, above a dense clay subsoil, and Nixa has a dense fragipan layer that slows water.","url":"https://terrabrain.vercel.app/regions/northeast-ozark-plateau-and-grand-lake#faq-4","section":"regions","topic":"Northeast Oklahoma soils"},{"question":"What soils cause foundation problems in northwest Oklahoma?","answer":"Northwest Oklahoma sits on Permian red beds with gypsum and salt that can form sinkholes, slow-draining clays such as Vernon, and loamy soils on soft rock.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills","section":"regions"},{"question":"Northwest Oklahoma soils: What is the climate like?","answer":"USDA descriptions for the area's main soils list mean annual precipitation of about 20 to 30 inches, typically near 25 inches, and mean annual temperatures of about 57 to 65 °F.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills#what-is-the-climate-like","section":"regions","topic":"Northwest Oklahoma soils"},{"question":"Northwest Oklahoma soils: What is the ground made of?","answer":"USDA maps most of this area within the Central Rolling Red Plains land resource area.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills#what-is-the-ground-made-of","section":"regions","topic":"Northwest Oklahoma soils"},{"question":"Northwest Oklahoma soils: What are the common foundation problems?","answer":"Karst subsidence and sinkholes where gypsum or salt lies at shallow depth; Perimeter drying settlement on Vernon clays during long droughts; Settlement and erosion problems on loose sands and steep escarpments.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills#what-are-the-common-foundation-problems","section":"regions","topic":"Northwest Oklahoma soils"},{"question":"Are there sinkholes in northwest Oklahoma?","answer":"Gypsum and shallow salt deposits occur in many areas of western Oklahoma, according to the Oklahoma Geological Survey. These rocks dissolve in circulating groundwater and can form caverns and sinkholes.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills#faq-1","section":"regions","topic":"Northwest Oklahoma soils"},{"question":"How much rain does northwest Oklahoma get?","answer":"USDA descriptions for the main soils around Woodward give mean annual precipitation of about 20 to 30 inches, with a typical value near 25 inches.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills#faq-2","section":"regions","topic":"Northwest Oklahoma soils"},{"question":"Which northwest Oklahoma soils are clay?","answer":"Vernon soils are moderately deep clays from Permian red-bed claystone with very slow permeability, and some layers contain soluble salts and sodium. Woodward and Quinlan soils are loamy over soft sandstone or siltstone.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills#faq-3","section":"regions","topic":"Northwest Oklahoma soils"},{"question":"Northwest Oklahoma soils: Is building on sand dunes a foundation concern?","answer":"Tivoli soils are deep, excessively drained wind-blown sands on dunes with slopes up to 45 percent. They do not shrink and swell like clay, but loose sand on slopes raises different concerns, including erosion and support near slopes.","url":"https://terrabrain.vercel.app/regions/northwest-gypsum-hills#faq-4","section":"regions","topic":"Northwest Oklahoma soils"},{"question":"What soils cause foundation problems in south-central Oklahoma?","answer":"Shale clays near Durant crack deeply when dry, the Arbuckles hold limestone karst, and sandy and Red River soils bring drainage and flooding concerns.","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma","section":"regions"},{"question":"South-central Oklahoma soils: What is the climate like?","answer":"Rainfall rises from west to east across the region. USDA descriptions give mean annual precipitation of about 33 to 39 inches for Zaneis soils, and about 37 to 45 inches for Durant soils. Mean annual temperatures run about 59 to 66 °F. See drought and wet cycles.","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma#what-is-the-climate-like","section":"regions","topic":"South-central Oklahoma soils"},{"question":"South-central Oklahoma soils: What is the ground made of?","answer":"Durant soils are very deep, moderately well drained clays weathered from Cretaceous clayey shale and claystone on broad, gently sloping ridges. Key facts from the USDA description:","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma#what-is-the-ground-made-of","section":"regions","topic":"South-central Oklahoma soils"},{"question":"South-central Oklahoma soils: What are the common foundation problems?","answer":"Perimeter drying settlement on Durant and similar clays during drought; Center heave when water collects under slabs on the same clays; Flood and erosion exposure on Red River and creek floodplains.","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma#what-are-the-common-foundation-problems","section":"regions","topic":"South-central Oklahoma soils"},{"question":"South-central Oklahoma soils: Why are foundations around Durant prone to movement?","answer":"Durant soils formed from Cretaceous clayey shale and claystone, have smectitic clay and very slow permeability, and develop cracks wider than 1 cm and deeper than 30 inches in dry periods, according to USDA.","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma#faq-1","section":"regions","topic":"South-central Oklahoma soils"},{"question":"South-central Oklahoma soils: Are there sinkholes in the Arbuckle Mountains area?","answer":"The Oklahoma Geological Survey reports limestone and dolomite karst in the Arbuckle Mountains. Karst forms where groundwater dissolves soluble rock, which can create caverns and sinkholes.","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma#faq-2","section":"regions","topic":"South-central Oklahoma soils"},{"question":"How much rain falls in south-central Oklahoma?","answer":"USDA descriptions give mean annual precipitation of about 37 to 45 inches for Durant soils and 33 to 39 inches for Zaneis soils farther west in the region.","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma#faq-3","section":"regions","topic":"South-central Oklahoma soils"},{"question":"Does south-central Oklahoma have earthquakes?","answer":"The Oklahoma Geological Survey lists Love and Carter Counties among the state's principal seismic areas, and gives typical Oklahoma earthquake magnitudes of about 1.8 to 2.5.","url":"https://terrabrain.vercel.app/regions/south-central-arbuckles-and-texoma#faq-4","section":"regions","topic":"South-central Oklahoma soils"},{"question":"What soils cause foundation problems in southeast Oklahoma?","answer":"Steep, rocky Ouachita slopes, Cretaceous shale clays that shrink and swell, flood-prone Red River sands and the state's heaviest rainfall.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river","section":"regions"},{"question":"Southeast Oklahoma soils: What is the climate like?","answer":"Oklahoma's climate grades from humid subtropical in the east to semi-arid in the west, and annual precipitation reaches about 56 inches in the far southeast.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river#what-is-the-climate-like","section":"regions","topic":"Southeast Oklahoma soils"},{"question":"Southeast Oklahoma soils: What is the ground like?","answer":"The bedrock of the mountains is described on Ouachita folded rocks.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river#what-is-the-ground-like","section":"regions","topic":"Southeast Oklahoma soils"},{"question":"Southeast Oklahoma soils: What are the common foundation problems?","answer":"Slope creep and lateral movement on steep Ouachita hillsides; Crawl space moisture and wood decay in a high-rainfall climate; Erosion and washout voids where heavy runoff reaches foundations.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river#what-are-the-common-foundation-problems","section":"regions","topic":"Southeast Oklahoma soils"},{"question":"Is southeast Oklahoma the wettest part of the state?","answer":"Yes. Statewide research notes annual precipitation of about 56 inches in the far southeast, compared with about 17 inches in the far western Panhandle.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river#faq-1","section":"regions","topic":"Southeast Oklahoma soils"},{"question":"Southeast Oklahoma soils: Are landslides and slope movement a concern in the Ouachitas?","answer":"The Oklahoma Geological Survey reports that most Oklahoma landslides occur in the eastern third of the state, where a wetter climate and steeper, mountainous terrain favor them.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river#faq-2","section":"regions","topic":"Southeast Oklahoma soils"},{"question":"Are there expansive clays in southeast Oklahoma?","answer":"Yes. Clays such as the Durant series, whose type location is in Bryan County, formed from Cretaceous shale and claystone and have smectitic clay, very slow permeability and deep cracks in dry periods.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river#faq-3","section":"regions","topic":"Southeast Oklahoma soils"},{"question":"Do Red River bottomland soils flood?","answer":"Kiomatia soils on Red River natural levees are described by USDA as frequently flooded for brief periods in most years where they are not protected.","url":"https://terrabrain.vercel.app/regions/southeast-ouachitas-and-red-river#faq-4","section":"regions","topic":"Southeast Oklahoma soils"},{"question":"What soils cause foundation problems in southwest Oklahoma?","answer":"Southwest Oklahoma has deep clays such as Hollister and Tillman that crack more than 30 inches deep when dry, and Foard, a cracking clay with a sodium-rich subsoil.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains","section":"regions"},{"question":"Southwest Oklahoma soils: What is the climate like?","answer":"USDA descriptions for the region's clay soils list mean annual precipitation of about 22 to 32 inches and mean annual temperatures of about 57 to 65 °F. Toward Chickasha on the eastern side, soils list about 35 to 41 inches.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains#what-is-the-climate-like","section":"regions","topic":"Southwest Oklahoma soils"},{"question":"Southwest Oklahoma soils: What is the ground made of?","answer":"Most of the region lies in the Central Rolling Red Plains land resource area, where soils formed in clayey alluvium and Permian red beds.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains#what-is-the-ground-made-of","section":"regions","topic":"Southwest Oklahoma soils"},{"question":"Southwest Oklahoma soils: What are the common foundation problems?","answer":"Perimeter drying settlement and tree-root desiccation settlement on deep-cracking clays; Center heave and leak-related heave when water collects under slabs; Soil pulled away from the foundation and wide surface cracks in summer.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains#what-are-the-common-foundation-problems","section":"regions","topic":"Southwest Oklahoma soils"},{"question":"Southwest Oklahoma soils: Why do foundations crack so much around Altus and Frederick?","answer":"Many soils there, such as Hollister and Tillman, are deep clays with very slow or slow permeability whose cracks extend deeper than 30 to 48 inches in dry periods. Hollister is a Vertisol, the soil order defined by strong shrink-swell.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains#faq-1","section":"regions","topic":"Southwest Oklahoma soils"},{"question":"Southwest Oklahoma soils: What is a sodic soil?","answer":"A sodic soil has a high share of sodium on its clay. Foard soils, formed partly from old granitic outwash of the Wichita Mountains, have a sodium-rich (natric) subsoil within about 22 to 66 inches, with exchangeable sodium of about 15 to 25 percent in its lower layers.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains#faq-2","section":"regions","topic":"Southwest Oklahoma soils"},{"question":"How much rain falls in southwest Oklahoma?","answer":"USDA descriptions for the region's clay soils list mean annual precipitation of about 22 to 32 inches, while soils on the region's eastern side near Chickasha list about 35 to 41 inches.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains#faq-3","section":"regions","topic":"Southwest Oklahoma soils"},{"question":"Is there gypsum in southwest Oklahoma?","answer":"The Oklahoma Geological Survey reports gypsum and shallow salt deposits in many areas of western Oklahoma, and limestone karst in the Limestone Hills north of the Wichita Mountains.","url":"https://terrabrain.vercel.app/regions/southwest-lawton-and-red-plains#faq-4","section":"regions","topic":"Southwest Oklahoma soils"},{"question":"What soils cause foundation problems in the Oklahoma City metro?","answer":"Much of the OKC metro has deep red shale clays like Renfrow and Kirkland that shrink and swell; other areas have shallower sandy soils over sandstone.","url":"https://terrabrain.vercel.app/regions/okc-metro","section":"regions"},{"question":"OKC metro soils: What is the Oklahoma City climate like?","answer":"USDA descriptions of the metro's main soils list mean annual precipitation of roughly 26 to 40 inches and mean annual temperatures around 56 to 64 °F.","url":"https://terrabrain.vercel.app/regions/okc-metro#what-is-the-oklahoma-city-climate-like","section":"regions","topic":"OKC metro soils"},{"question":"What ground lies under the metro?","answer":"Clay soils formed from Permian-age shale — the Hennessey Shale and related red beds — cover large parts of the metro.","url":"https://terrabrain.vercel.app/regions/okc-metro#what-ground-lies-under-the-metro","section":"regions","topic":"OKC metro soils"},{"question":"Which soils are common in the metro?","answer":"More series are listed in soil series in the OKC metro.","url":"https://terrabrain.vercel.app/regions/okc-metro#which-soils-are-common-in-the-metro","section":"regions","topic":"OKC metro soils"},{"question":"OKC metro soils: What foundation problems are common?","answer":"Perimeter drying settlement and tree-root desiccation settlement on the shrink-swell clays during drought; Center heave and leak-related heave when water collects under slabs on the same clays; Framing and support problems in older crawl-space homes.","url":"https://terrabrain.vercel.app/regions/okc-metro#what-foundation-problems-are-common","section":"regions","topic":"OKC metro soils"},{"question":"OKC metro soils: Do earthquakes affect OKC foundations?","answer":"The Oklahoma Geological Survey lists El Reno–Mustang and central Oklahoma among the state's principal seismic areas. Telling earthquake damage from soil movement is covered in seismic damage vs soil movement and induced seismicity in Oklahoma.","url":"https://terrabrain.vercel.app/regions/okc-metro#do-earthquakes-affect-okc-foundations","section":"regions","topic":"OKC metro soils"},{"question":"OKC metro soils: Why do so many Oklahoma City homes have foundation problems?","answer":"Much of the metro sits on clay soils weathered from Permian shale, such as Renfrow and Kirkland, which have vertic shrink-swell properties. These clays shrink in drought and swell when wet, moving shallow foundations.","url":"https://terrabrain.vercel.app/regions/okc-metro#faq-1","section":"regions","topic":"OKC metro soils"},{"question":"Are soils on the east side of the metro different from the west side?","answer":"Yes. Western and southern parts include clays over Permian shale, while other areas include Stephenville and Darnell soils formed from Permian sandstone, which are shallower to rock and not described with vertic properties.","url":"https://terrabrain.vercel.app/regions/okc-metro#faq-2","section":"regions","topic":"OKC metro soils"},{"question":"OKC metro soils: How much rain does the Oklahoma City area get?","answer":"USDA soil descriptions for the area's main soils give mean annual precipitation of roughly 26 to 40 inches, with typical values of about 32 inches.","url":"https://terrabrain.vercel.app/regions/okc-metro#faq-3","section":"regions","topic":"OKC metro soils"},{"question":"OKC metro soils: Does the OKC area have earthquakes?","answer":"The Oklahoma Geological Survey has identified the El Reno-Mustang area and central Oklahoma among the state's principal seismic areas.","url":"https://terrabrain.vercel.app/regions/okc-metro#faq-4","section":"regions","topic":"OKC metro soils"},{"question":"What were Oklahoma's worst recent drought and wet years?","answer":"Oklahoma had near-statewide drought in 2011 and 2012, its wettest month on record in May 2015, and a 2022 drought that dried soils at least 32 inches deep.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years","section":"data"},{"question":"Drought and wet years: Why does weather history matter for foundations?","answer":"Oklahoma's expansive clays shrink as they dry and swell as they wet. The upper layer that responds to weather, called the active zone, is estimated at about 0.5 to 4 meters (1.6 to 13 feet) deep across the state, and the shallowest soil responds most strongly to climate.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#why-does-weather-history-matter-for-foundations","section":"data","topic":"Drought and wet years"},{"question":"What were Oklahoma's historic drought and wet periods?","answer":"The U.S. Geological Survey identifies four major 20th-century drought periods in Oklahoma by water year: 1929 to 1941, 1952 to 1956, 1961 to 1972 and 1976 to 1981.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#what-were-oklahoma-s-historic-drought-and-wet-periods","section":"data","topic":"Drought and wet years"},{"question":"Drought and wet years: What were the recent weather extremes?","answer":"Drought levels come from the U.S. Drought Monitor: D2 is severe, D3 extreme, and D4 exceptional.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#what-were-the-recent-weather-extremes","section":"data","topic":"Drought and wet years"},{"question":"Drought and wet years: How much water does Oklahoma lose to evaporation?","answer":"Evaporation pulls water out of exposed soil and water surfaces during the warm season. OSU Extension fact sheet BAE-1529 reports average May to October evaporation from shallow water bodies:","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#how-much-water-does-oklahoma-lose-to-evaporation","section":"data","topic":"Drought and wet years"},{"question":"Drought and wet years: What was the wettest month in Oklahoma history?","answer":"May 2015, when the statewide average was 14.40 inches, beating the old record of 10.75 inches from October 1941. Oklahoma City received 19.48 inches that month.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#faq-1","section":"data","topic":"Drought and wet years"},{"question":"How bad was the 2011 to 2012 drought in Oklahoma?","answer":"In August 2011, 93% of Oklahoma was in extreme or exceptional drought, including 65% in exceptional drought. In August 2012, about 97% of the state was in extreme or exceptional drought.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#faq-2","section":"data","topic":"Drought and wet years"},{"question":"How dry was the soil in the 2022 drought?","answer":"The Oklahoma Mesonet measured critically dry soils down to at least 32 inches in September 2022, when about 94% of the state was in severe drought or worse.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#faq-3","section":"data","topic":"Drought and wet years"},{"question":"Drought and wet years: Does Oklahoma lose more water to evaporation than it gets in rain?","answer":"Evaporation is high. OSU Extension reports May to October evaporation from shallow water of about 28 to 30 inches in eastern Oklahoma and about 40 to 44 inches in the southwest, west central and Panhandle divisions.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#faq-4","section":"data","topic":"Drought and wet years"},{"question":"What was Oklahoma's worst drought on record?","answer":"The 1950s drought stands out: 1950 to 1956 was the driest seven-year period of the 20th century, averaging 28.51 inches of rain a year statewide, and it ended with major flooding in May 1957.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#faq-5","section":"data","topic":"Drought and wet years"},{"question":"Drought and wet years: What was Oklahoma's wettest year?","answer":"2015, with a preliminary statewide total of 53.88 inches, breaking the 1957 record of 47.88 inches.","url":"https://terrabrain.vercel.app/data/drought-and-wet-years#faq-6","section":"data","topic":"Drought and wet years"},{"question":"When do I need an engineer for foundation problems in Oklahoma?","answer":"A licensed engineer gives an independent, sealed opinion on the cause and needed repair. Lenders, insurers and buyers may ask for an engineer's report.","url":"https://terrabrain.vercel.app/guides/working-with-engineers","section":"guides"},{"question":"When is an engineer commonly involved?","answer":"Home sales. Oklahoma's standard sale contract lets buyers hire registered professional engineers and lists a structural inspection as a separate investigation; Mortgage conditions.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#when-is-an-engineer-commonly-involved","section":"guides","topic":"When to hire an engineer"},{"question":"What is the difference between structural and geotechnical engineers?","answer":"A geotechnical engineer investigates site soils and recommends site preparation and foundation design; a written geotechnical report typically includes soil logs, water table, foundation recommendations, expansive-soil mitigation and expected movements.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#what-is-the-difference-between-structural-and-geotechnical-engineers","section":"guides","topic":"When to hire an engineer"},{"question":"How does Oklahoma's board expect repair engineering to work?","answer":"The engineering board's compliance guidelines for foundation repair companies set out these steps: 1. A PE (directly or through a repair company) takes responsibility for the project. 2.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#how-does-oklahoma-s-board-expect-repair-engineering-to-work","section":"guides","topic":"When to hire an engineer"},{"question":"What helps an engineer evaluate a house?","answer":"An elevation survey with the raw readings; A crack map with dated photos; The soil series from the NRCS soil survey (see soil series in the Tulsa metro).","url":"https://terrabrain.vercel.app/guides/working-with-engineers#what-helps-an-engineer-evaluate-a-house","section":"guides","topic":"When to hire an engineer"},{"question":"Who licenses engineers in Oklahoma?","answer":"The Oklahoma State Board of Licensure for Professional Engineers and Land Surveyors. The board also authorizes a separate Structural Engineer (S.E.) designation for licensed professional engineers who meet extra exam requirements.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#faq-1","section":"guides","topic":"When to hire an engineer"},{"question":"Does a foundation repair plan have to be stamped by an engineer?","answer":"When an engineer prepares the plan, Oklahoma's engineering board guidelines say the plan must be signed, sealed and dated, and that the engineer, not the repair company, controls the plan.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#faq-2","section":"guides","topic":"When to hire an engineer"},{"question":"What is the difference between a structural and a geotechnical engineer?","answer":"A geotechnical engineer investigates the soil and rock and recommends site preparation and foundation design values; a structural engineer designs and evaluates the building's load-carrying parts, such as beams and pier layouts.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#faq-3","section":"guides","topic":"When to hire an engineer"},{"question":"When to hire an engineer: Can my home inspector tell me if the foundation needs repair?","answer":"Oklahoma home inspectors must describe signs of movement, but they are not required to determine causes, choose repair methods or perform engineering, so reports often recommend further evaluation by a qualified professional.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#faq-4","section":"guides","topic":"When to hire an engineer"},{"question":"Will a lender require an engineer's report?","answer":"It can. Fannie Mae's rules say that when an appraisal shows abnormal settlement, the lender must show it was corrected or provide a professionally prepared report that it poses no threat of structural damage.","url":"https://terrabrain.vercel.app/guides/working-with-engineers#faq-5","section":"guides","topic":"When to hire an engineer"},{"question":"When do Oklahoma foundations move during the year?","answer":"Clay swells in wet springs, shrinks in hot, dry midsummer and partly rewets with fall rains, so cracks often open in late summer and narrow in spring.","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar","section":"guides"},{"question":"Why does the calendar matter?","answer":"Expansive clay swells when water enters and shrinks when it dries, and uneven moisture under a house causes differential movement. Because Oklahoma's rainfall and evaporation follow a seasonal rhythm, so does much foundation movement.","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#why-does-the-calendar-matter","section":"guides","topic":"Seasonal movement calendar"},{"question":"What is the general seasonal pattern?","answer":"Most of Oklahoma's precipitation falls in spring and summer, and the state ranges from under 20 inches a year in the west to more than 50 in the southeast.","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#what-is-the-general-seasonal-pattern","section":"guides","topic":"Seasonal movement calendar"},{"question":"Seasonal movement calendar: How much does it vary year to year?","answer":"The seasonal pattern is a tendency, not a rule:","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#how-much-does-it-vary-year-to-year","section":"guides","topic":"Seasonal movement calendar"},{"question":"Seasonal movement calendar: How can soil moisture be tracked through the year?","answer":"The Oklahoma Mesonet reports daily soil moisture as a fractional water index from 0 (very dry) to 1 (very wet). A few points from the sources:","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#how-can-soil-moisture-be-tracked-through-the-year","section":"guides","topic":"Seasonal movement calendar"},{"question":"Seasonal movement calendar: When are foundation cracks worst in Oklahoma?","answer":"Cracks from shrinking clay tend to open in hot, dry stretches, which in Oklahoma usually means July and August, when rainfall relaxes and evaporation is high. They often narrow again when spring or fall rains rewet the soil.","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#faq-1","section":"guides","topic":"Seasonal movement calendar"},{"question":"Seasonal movement calendar: Why did my cracks close up in the spring?","answer":"Spring is one of Oklahoma's wettest periods, and clay swells as it takes on water. A crack that closes has not necessarily been fixed; it may reopen the next time the soil dries.","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#faq-2","section":"guides","topic":"Seasonal movement calendar"},{"question":"Seasonal movement calendar: Does frost move foundations in Oklahoma?","answer":"Less than in northern states. Oklahoma winters are shorter and milder than the northern Plains, and the Oklahoma Climatological Survey describes frozen soil as infrequent, shallow and brief.","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#faq-3","section":"guides","topic":"Seasonal movement calendar"},{"question":"Seasonal movement calendar: Does the season affect foundation measurements?","answer":"Comparing measurements taken under similar soil moisture gives the clearest picture. Recording the season and current Mesonet soil moisture with each survey helps make later readings comparable.","url":"https://terrabrain.vercel.app/guides/seasonal-movement-calendar#faq-4","section":"guides","topic":"Seasonal movement calendar"},{"question":"When is cosmetic crack repair enough?","answer":"When cracks come from something other than foundation movement, or movement has stopped. If soil is still moving the house, cosmetic repairs reopen.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only","section":"repairs"},{"question":"When is cosmetic repair the whole answer?","answer":"Not every crack means the foundation is moving. Several common causes of cracking leave the foundation sound:","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#when-is-cosmetic-repair-the-whole-answer","section":"repairs","topic":"Cosmetic repair only"},{"question":"Cosmetic repair only: Why does the movement trend decide?","answer":"Expansive soils, usually clays, can cause excessive cracking of floors, walls and foundations as they shrink and swell. In clay, moisture change follows wet and dry seasons and can reach from 3 to 40 ft deep.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#why-does-the-movement-trend-decide","section":"repairs","topic":"Cosmetic repair only"},{"question":"What does cosmetic repair include?","answer":"Drywall crack repair and re-taping; Brick and mortar repair (repointing) and sealing of veneer cracks; Trim, baseboard and crown molding adjustment.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#what-does-cosmetic-repair-include","section":"repairs","topic":"Cosmetic repair only"},{"question":"When is cosmetic repair a supporting step?","answer":"Cosmetic work also follows structural repair. After movement from center heave, a leak or settlement has been stopped, finishes are repaired as the last step. Finishing first and stopping movement later risks repeating the work, since cracks reopen while the mechanism is active.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#when-is-cosmetic-repair-a-supporting-step","section":"repairs","topic":"Cosmetic repair only"},{"question":"Cosmetic repair only: Can I just patch cracks without fixing the foundation?","answer":"Patching finishes is the full repair when the cracks come from causes other than ongoing foundation movement, such as concrete shrinkage, or when movement has stopped. If an active soil mechanism is still moving the house, patched cracks tend to reopen.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#faq-1","section":"repairs","topic":"Cosmetic repair only"},{"question":"Cosmetic repair only: How do I know if foundation movement has stopped?","answer":"Repeated floor elevation readings over wet and dry seasons show whether the house is still moving. Clay soil moisture changes with the seasons, so one set of readings cannot separate seasonal movement from steady movement.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#faq-2","section":"repairs","topic":"Cosmetic repair only"},{"question":"Cosmetic repair only: Are hairline cracks in new concrete normal?","answer":"Concrete shrinks as it dries, and extra mixing water increases shrinkage. Engineering guidance for slabs on swelling soil states that some cracking of floating slabs should be expected.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#faq-3","section":"repairs","topic":"Cosmetic repair only"},{"question":"Do cracks that open and close with the seasons need structural repair?","answer":"Not always. Seasonal opening and closing points to clay shrinking and swelling with moisture. Whether that calls for structural work depends on how large the movement is and whether it trends in one direction over time.","url":"https://terrabrain.vercel.app/repairs/cosmetic-repair-only#faq-4","section":"repairs","topic":"Cosmetic repair only"},{"question":"When is foundation or slab replacement needed?","answer":"Replacement is the most disruptive repair, used when piers, lifting and moisture control cannot restore the foundation, and it follows an engineered design.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement","section":"repairs"},{"question":"When is replacement considered?","answer":"Replacement is generally a last resort for severe cases, such as:","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#when-is-replacement-considered","section":"repairs","topic":"Slab or foundation replacement"},{"question":"Slab or foundation replacement: Why do soil conditions drive the design?","answer":"Clay with a linear extensibility (an NRCS measure of shrink-swell) of more than 3% can shrink and swell enough to damage buildings, and special design is often needed.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#why-do-soil-conditions-drive-the-design","section":"repairs","topic":"Slab or foundation replacement"},{"question":"What replacement foundation options exist?","answer":"An engineering committee comparison of foundation systems on expansive clay describes the following:","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#what-replacement-foundation-options-exist","section":"repairs","topic":"Slab or foundation replacement"},{"question":"Slab or foundation replacement: What are void spaces and why are they used?","answer":"A void space is a deliberate gap between swelling soil and a suspended slab or beam. It is formed with cardboard (corrugated paper) forms that hold up the wet concrete and later break down, or with plastic or metal forms.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#what-are-void-spaces-and-why-are-they-used","section":"repairs","topic":"Slab or foundation replacement"},{"question":"Slab or foundation replacement: What are the limitations?","answer":"Highest disruption of any repair, since floors, plumbing and finishes over the replaced area are removed and rebuilt; Requires engineered design, permits and inspection — see codes and permits and working with engineers; Cost is driven by the area replaced, pier count and depth, access, and the restoration of plumbing and finishes.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#what-are-the-limitations","section":"repairs","topic":"Slab or foundation replacement"},{"question":"When is a foundation replaced instead of repaired?","answer":"Replacement is generally reserved for severe cases, such as major original construction defects or badly damaged post-tensioned slabs, where piers, lifting and moisture control cannot restore acceptable performance. The decision rests on an engineer's evaluation.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#faq-1","section":"repairs","topic":"Slab or foundation replacement"},{"question":"What is a structural slab with a void space?","answer":"It is a concrete floor that spans between grade beams carried on deep piers, cast over corrugated paper forms that later degrade, or over plastic or metal forms. The forms leave a gap of about 1 to 24 inches so swelling clay can rise without pushing on the slab.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#faq-2","section":"repairs","topic":"Slab or foundation replacement"},{"question":"Is a crawl space better than a slab on expansive clay?","answer":"An engineering design review describes a raised wood floor over a crawl space on deep foundations as usually the highest-cost option; it reduces vertical movement from expansive soil if enough crawl space is maintained, and it needs ventilation and drainage.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#faq-3","section":"repairs","topic":"Slab or foundation replacement"},{"question":"What information does an engineer need to design a replacement foundation?","answer":"A geotechnical report with soil borings, lab tests and an estimate of how much the ground could rise or fall, including the void height needed for a suspended slab.","url":"https://terrabrain.vercel.app/repairs/slab-or-foundation-replacement#faq-4","section":"repairs","topic":"Slab or foundation replacement"},{"question":"Which foundation pier type is right for an Oklahoma home?","answer":"Pressed concrete, steel push, helical and drilled piers differ in installation and bearing; on clay, the key is reaching below soil that swells and shrinks.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix","section":"repairs"},{"question":"How do the pier types compare?","answer":"Trade words: underpinning means adding support under an existing foundation; refusal is the point where a pier will not go deeper under the applied force; reaction is the weight a hydraulic jack pushes against.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#how-do-the-pier-types-compare","section":"repairs","topic":"Pier type comparison"},{"question":"Pier type comparison: What does Oklahoma installation data show?","answer":"Oklahoma steel push pier installation records give these working figures: - Typical depth 8 to 16 ft at exterior footings and 5 to 13 ft at interior locations. - At one large Tulsa site, 396 piers reached a median depth of 12 ft, with the middle half between 9 and 14 ft and a full range of 2 to 40 ft, at a median of about 9,000 psi. - Field standard of 6,000 psi minimum, with 8,000 to 10,000 psi as the target range. - Spacing usually about 7 ft between piers. - Pressed concrete piles in the same records usually stopped at 5 to 12 ft.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#what-does-oklahoma-installation-data-show","section":"repairs","topic":"Pier type comparison"},{"question":"Pier type comparison: Why does depth matter on clay?","answer":"Seasonal moisture change can extend from 3 to 40 ft deep. Engineering guidance calls for piers on swelling soil to extend well below that zone and to be anchored against uplift.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#why-does-depth-matter-on-clay","section":"repairs","topic":"Pier type comparison"},{"question":"Pier type comparison: What questions guide the decision?","answer":"Heave or settlement? Piers hold up settling areas; heave calls for other methods. See heave vs settlement; Is a water source still active? Grading, gutters and leaks are addressed first; the code calls for grade to fall at least 6 in within 10 ft of the foundation.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#what-questions-guide-the-decision","section":"repairs","topic":"Pier type comparison"},{"question":"What non-pier methods are used?","answer":"Every mechanism is matched to these methods in the mechanism-method matrix.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#what-non-pier-methods-are-used","section":"repairs","topic":"Pier type comparison"},{"question":"What is the difference between push piers and helical piers?","answer":"Steel push piers are driven down in sections using the weight of the building as the reaction, and the hydraulic pressure is recorded at each pier. Helical piers are screwed in with a torque motor, do not need building weight, and the final torque is recorded.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#faq-1","section":"repairs","topic":"Pier type comparison"},{"question":"How deep do foundation piers go in Tulsa?","answer":"In Oklahoma steel push pier installation records, exterior piers typically reached 8 to 16 feet. Across 396 piers at one large Tulsa site, the median depth was 12 feet, with the middle half between 9 and 14 feet and a full range of 2 to 40 feet.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#faq-2","section":"repairs","topic":"Pier type comparison"},{"question":"Why does pier depth matter on clay?","answer":"Piers that stop inside the zone where clay swells and shrinks with the seasons can move with the clay. Research describes six-foot piers that handled normal annual fluctuations but did not appear adequate over a two-year drought followed by an extremely wet year.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#faq-3","section":"repairs","topic":"Pier type comparison"},{"question":"Pier type comparison: What decides which repair method fits a house?","answer":"The main factors are whether the house is settling or heaving, whether a water source is still active, the weight of the structure, the depth to firm bearing, the need to resist upward pull, and access around and under the house.","url":"https://terrabrain.vercel.app/repairs/method-selection-matrix#faq-4","section":"repairs","topic":"Pier type comparison"},{"question":"Which foundation repair method fits each cause of movement?","answer":"Each repair method only works for some causes. Piers can hold up settlement, but they cannot fix heave or water problems.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix","section":"repairs"},{"question":"Repair method by cause: How do you read the table?","answer":"Primary: the method acts on the cause or carries the load the cause has taken away; Supporting: the method helps, protects the main repair, or controls part of the cause, but is not enough alone; Not suitable: the method works against the cause, cannot act on it, or treats a symptom while the cause continues.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix#how-do-you-read-the-table","section":"repairs","topic":"Repair method by cause"},{"question":"Repair method by cause: What is the physical logic behind the table?","answer":"Settlement vs. heave: swelling clay lifts lightly loaded foundations, and corners tend to rise relative to the center of a slab.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix#what-is-the-physical-logic-behind-the-table","section":"repairs","topic":"Repair method by cause"},{"question":"Which methods fit which causes?","answer":"A mimic is a crack pattern that looks like foundation movement but comes from something else, such as roof framing or concrete shrinkage; see cosmetic repair only. Whether a house is settling or heaving is worked out in heave vs settlement.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix#which-methods-fit-which-causes","section":"repairs","topic":"Repair method by cause"},{"question":"Why does the cause of movement decide the repair method?","answer":"Different causes move a foundation in different directions. Piers hold up settling foundations, but they cannot pull down a foundation lifted by swelling clay, and they do nothing about a water source or a plumbing leak.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix#faq-1","section":"repairs","topic":"Repair method by cause"},{"question":"Are piers the right repair for every foundation problem?","answer":"No. Piers are a primary method for settlement, but heave, leaks, crawl space moisture and basement wall pressure are addressed with other methods such as drainage, leak repair, moisture control and wall repair.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix#faq-2","section":"repairs","topic":"Repair method by cause"},{"question":"What does a supporting method mean in this table?","answer":"A supporting method helps control the cause or protect the main repair but is not enough on its own, such as drainage alongside perimeter piers on clay that dries and shrinks.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix#faq-3","section":"repairs","topic":"Repair method by cause"},{"question":"Repair method by cause: Why is lime stabilization marked with caution in sulfate soils?","answer":"Oklahoma highway research found that lime added to a high-sulfate soil formed ettringite and increased swell by more than 1,200 percent, so sulfate testing comes before lime treatment.","url":"https://terrabrain.vercel.app/repairs/mechanism-method-matrix#faq-4","section":"repairs","topic":"Repair method by cause"},{"question":"Which soil series are found under Oklahoma homes?","answer":"This index lists 55 Oklahoma soil series by region; find the soil under a house with the free Web Soil Survey map, then read the matching series page.","url":"https://terrabrain.vercel.app/soils/soil-series-index","section":"soils"},{"question":"How does soil series information work?","answer":"The USDA Natural Resources Conservation Service (NRCS) publishes an Official Series Description (OSD) for every named soil series, searchable by name or list.","url":"https://terrabrain.vercel.app/soils/soil-series-index#how-does-soil-series-information-work","section":"soils","topic":"Oklahoma soil series index"},{"question":"Oklahoma soil series index: How is shrink-swell read?","answer":"NRCS rates shrink-swell using linear extensibility percent (LEP), the change in length of a soil clod as it dries from a moist to a dry state. The classes are:","url":"https://terrabrain.vercel.app/soils/soil-series-index#how-is-shrink-swell-read","section":"soils","topic":"Oklahoma soil series index"},{"question":"Which soil series occur in each region?","answer":"Many series cross regional lines, so some appear under more than one region.","url":"https://terrabrain.vercel.app/soils/soil-series-index#which-soil-series-occur-in-each-region","section":"soils","topic":"Oklahoma soil series index"},{"question":"What is a soil series?","answer":"A soil series is a named group of soils with similar layers, texture, parent material and properties. USDA NRCS keeps an Official Series Description for each one, and soil maps show which series occur on a given piece of land.","url":"https://terrabrain.vercel.app/soils/soil-series-index#faq-1","section":"soils","topic":"Oklahoma soil series index"},{"question":"How do I find which soil series is under my house?","answer":"Web Soil Survey, the free USDA soil map, shows the mapped soil units for any address in most U.S. counties. A map unit is named for its main series, and a site investigation confirms actual conditions on a lot.","url":"https://terrabrain.vercel.app/soils/soil-series-index#faq-2","section":"soils","topic":"Oklahoma soil series index"},{"question":"Which number tells me if a soil shrinks and swells?","answer":"NRCS uses linear extensibility percent. Under 3 percent is low, 3 to 6 moderate, 6 to 9 high and more than 9 very high, and values above 3 can damage buildings.","url":"https://terrabrain.vercel.app/soils/soil-series-index#faq-3","section":"soils","topic":"Oklahoma soil series index"},{"question":"What do words like vertic and smectitic mean in a soil name?","answer":"Vertic means the soil has strong shrink-swell features such as deep cracks or slickensides. Smectitic means the clay is mainly smectite, the clay group that swells the most when wet.","url":"https://terrabrain.vercel.app/soils/soil-series-index#faq-4","section":"soils","topic":"Oklahoma soil series index"},{"question":"Why are my cabinets or countertops pulling away from the wall?","answer":"The floor or wall may have moved; on Oklahoma clay one cause is center heave, where the slab interior rises, though cabinets also loosen for ordinary reasons.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating","section":"signs"},{"question":"Why do cabinets show foundation movement?","answer":"Base cabinets sit on the floor and are screwed to the wall; upper cabinets hang from the wall framing; countertops span across the base cabinets. When the floor under one end rises or drops, or the wall tilts, the straight lines of cabinets and counters reveal it.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#why-do-cabinets-show-foundation-movement","section":"signs","topic":"Cabinets separating"},{"question":"Cabinets separating: How does center heave cause it?","answer":"This site links the sign to center heave (moisture build-up under slab). Center lift happens when swelling is concentrated under the middle of a building, or when the edges shrink, so the center ends up high.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#how-does-center-heave-cause-it","section":"signs","topic":"Cabinets separating"},{"question":"Cabinets separating: What else can cause it?","answer":"Home inspection standards list uneven floors, drywall cracks, brick cracks and out-of-square door frames as signs of possible foundation movement to report.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#what-else-can-cause-it","section":"signs","topic":"Cabinets separating"},{"question":"Cabinets separating: How can it be checked?","answer":"Put a level on the countertop front to back and side to side, and note the low direction; Measure gaps between cabinets and wall, and between countertop and backsplash, at marked spots; Photograph each gap with a ruler in view, and repeat over several months.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#how-can-it-be-checked","section":"signs","topic":"Cabinets separating"},{"question":"Cabinets separating: What are the next steps?","answer":"Plot it on the elevation survey, compare with the distress pattern library, and use the symptom matrix to weigh likely mechanisms.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#what-are-the-next-steps","section":"signs","topic":"Cabinets separating"},{"question":"Why are my kitchen cabinets pulling away from the wall?","answer":"If the floor under the cabinets or the wall behind them has moved, the gap can open. On expansive clay, one possible cause is center heave, where soil under the middle of the slab swells and lifts interior areas relative to the edges.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#faq-1","section":"signs","topic":"Cabinets separating"},{"question":"Can a gap behind cabinets be something other than foundation movement?","answer":"Yes. Installation or fastener problems can also open gaps. Checking whether the floor and countertop are out of level, and whether other signs are present nearby, helps sort it out.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#faq-2","section":"signs","topic":"Cabinets separating"},{"question":"Cabinets separating: How do I check if my countertop is out of level?","answer":"Use a level along the front and sides of the counter and note which direction is low. Comparing that with a floor elevation survey shows whether the floor has moved in the same direction.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#faq-3","section":"signs","topic":"Cabinets separating"},{"question":"Cabinets separating: What is center heave?","answer":"Center heave, also called center lift, is swelling concentrated under the middle of a building, or shrinkage under its edges, so the interior ends up high relative to the perimeter.","url":"https://terrabrain.vercel.app/signs/cabinets-or-countertops-separating#faq-4","section":"signs","topic":"Cabinets separating"},{"question":"Why are my floor tiles cracking in a straight line?","answer":"A crack running through several tiles usually follows a crack or bend in the slab below, often from clay swelling under part of it or edges settling.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line","section":"signs"},{"question":"Why does tile show slab cracks?","answer":"Ceramic and stone tile is bonded tightly to the slab. Tile is stiff and brittle, so it cannot stretch across a crack that opens beneath it. When the slab cracks or bends, the tile directly above it cracks along the same path.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line#why-does-tile-show-slab-cracks","section":"signs","topic":"Tile cracks in a line"},{"question":"Tile cracks in a line: How do you document it?","answer":"Trace the line from end to end and mark the ends with tape and a date; Measure the width at the widest point and check whether one side is higher than the other (a height difference, or offset); Photograph with a ruler in view, including a close-up of any offset.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line#how-do-you-document-it","section":"signs","topic":"Tile cracks in a line"},{"question":"Tile cracks in a line: What happens next?","answer":"If a leak is suspected, plumbing leak detection and repair comes first, since the moisture source drives the heave. For other mechanisms, compare the crack map with the distress pattern library and the symptom matrix.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line#what-happens-next","section":"signs","topic":"Tile cracks in a line"},{"question":"Why are my floor tiles cracking in a line?","answer":"A crack that runs straight through several tiles usually follows a crack or movement in the concrete slab underneath. The tile is bonded to the slab, so when the slab cracks or bends, the tile above it cracks along the same line.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line#faq-1","section":"signs","topic":"Tile cracks in a line"},{"question":"Does a tile crack line mean my foundation is failing?","answer":"Not by itself. Concrete slabs commonly crack, and a single stable crack may simply be telegraphing through. A line that widens, shows a height difference across it, or comes with a floor hump or wall cracks points toward ongoing soil movement.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line#faq-2","section":"signs","topic":"Tile cracks in a line"},{"question":"Can a plumbing leak cause tile to crack?","answer":"It can on clay soil. Leaking pipes add water that can worsen swelling of the soil under the slab, lifting that area and cracking the slab and tile above it.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line#faq-3","section":"signs","topic":"Tile cracks in a line"},{"question":"How do I document a tile crack?","answer":"Trace the full length of the line, measure its width and any height difference between the two sides, photograph it with a ruler, and mark it on a floor plan so it can be compared with a floor elevation survey.","url":"https://terrabrain.vercel.app/signs/floor-tile-cracks-in-a-line#faq-4","section":"signs","topic":"Tile cracks in a line"},{"question":"Why are my foundation piers moving after repair?","answer":"Piers that miss stable soil or rock can be lifted by swelling clay, settle when ending too shallow in shrinking clay, or be dragged down by settling fill.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair","section":"causes"},{"question":"What determines how well a pier performs?","answer":"For reference, Oklahoma steel push pier installation records show typical pier depths of about 8 to 16 feet, with a median of about 12 feet in Tulsa, and installation pressures around 9,000 psi with a 6,000 psi minimum. See steel push piers.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#what-determines-how-well-a-pier-performs","section":"causes","topic":"Pier movement after repair"},{"question":"What are the signs of pier movement?","answer":"doors that bind again in a previously repaired area; stair-step brick cracks wider at the bottom; stair-step brick cracks wider at the top.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#what-are-the-signs-of-pier-movement","section":"causes","topic":"Pier movement after repair"},{"question":"How is pier movement evaluated?","answer":"Post-repair survey. The Texas guidelines call for floor elevations to be measured after remedial work, recorded and given to the client; Repeated surveys. A single survey shows shape at one moment; repeated surveys over months or years show change.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#how-is-pier-movement-evaluated","section":"causes","topic":"Pier movement after repair"},{"question":"How is pier movement typically addressed?","answer":"The approach depends on whether piers rose or settled. Recognized principles include extending supports below the zone of moisture fluctuation and designing piers in expansive soil on the assumption that their upper sections lose soil contact.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#how-is-pier-movement-typically-addressed","section":"causes","topic":"Pier movement after repair"},{"question":"Can foundation piers move after they are installed?","answer":"Yes. Piers that end within the zone of soil that shrinks and swells can be lifted when the clay swells and lose grip when it shrinks. Engineering literature documents drilled corner piers being lifted in wet seasons and losing skin friction in the following dry season.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#faq-1","section":"causes","topic":"Pier movement after repair"},{"question":"How deep do piers need to go to avoid soil movement?","answer":"The standard approach is to extend foundations below the zone of seasonal moisture change. In Oklahoma that active zone has been estimated at roughly 0.5 to 4 meters, and Oklahoma push pier installation records show typical depths of about 8 to 16 feet.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#faq-2","section":"causes","topic":"Pier movement after repair"},{"question":"What is skin friction on a pier?","answer":"Skin friction is the grip of the surrounding soil along the sides of a pier. When clay dries and shrinks away from a pier, that grip is lost, and when clay swells it can grab the pier and push it upward.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#faq-3","section":"causes","topic":"Pier movement after repair"},{"question":"How do I know if my repaired foundation is moving again?","answer":"Compare a new floor elevation survey with the survey recorded after the repair. Texas engineering guidelines call for floor elevations to be measured after remedial work and given to the client, and repeated surveys show change over time.","url":"https://terrabrain.vercel.app/causes/pier-uplift-or-movement-after-repair#faq-4","section":"causes","topic":"Pier movement after repair"},{"question":"Why are retaining walls, fences and trees leaning on my slope?","answer":"When they all lean the same way, the upper soil may be slowly creeping downhill, which can also pull at foundations near the slope.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees","section":"signs"},{"question":"Leaning walls, fences, trees: What does this sign look like?","answer":"Retaining walls tipping outward or bulging at mid-height; Fence posts leaning downhill in a row, or fence lines that have bowed; Trees tilted downhill.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#what-does-this-sign-look-like","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"Leaning walls, fences, trees: Why does it happen?","answer":"Creep is very slow downhill movement of the upper soil, often too slow to see except through its effects on things anchored in it. Inspection guidance notes that clay soils on slopes can slowly drift downhill, causing settlement.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#why-does-it-happen","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"Leaning walls, fences, trees: How is it documented?","answer":"A common inspection rule says a wall is usually considered unsafe if a plumb line through its center of gravity does not fall within the middle third of its base, and that a structural engineer should be consulted in that case. Floor readings are covered in elevation surveys.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#how-is-it-documented","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"Leaning walls, fences, trees: How is drainage handled on sloped lots?","answer":"Building guidance calls for grassy swales (shallow drainage channels) to slope at least about 1 percent and no more than about 15 percent unless lined with riprap, meaning rock armor.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#how-is-drainage-handled-on-sloped-lots","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"Why are the fence posts and trees on my slope leaning downhill?","answer":"Features that lean the same way on a slope can indicate the upper soil is slowly moving downhill. Clay soils on slopes can gradually drift downward, a process called creep.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#faq-1","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"When is a leaning retaining wall considered unsafe?","answer":"A common inspection rule says a wall is usually considered unsafe if a plumb line dropped through its center of gravity falls outside the middle third of its base. In that case a structural engineer's evaluation is typically called for.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#faq-2","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"Leaning walls, fences, trees: Does Oklahoma have landslides?","answer":"Yes. The Oklahoma Geological Survey monitors and maps landslides statewide, with research focused on shallow landslides in eastern Oklahoma.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#faq-3","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"Leaning walls, fences, trees: Can slope movement affect my house foundation?","answer":"Yes. Downhill drift of clay soil can cause settlement of structures on or near the slope, which may show as cracks and floors sloping toward the downhill side.","url":"https://terrabrain.vercel.app/signs/tilted-retaining-walls-fences-or-trees#faq-4","section":"signs","topic":"Leaning walls, fences, trees"},{"question":"Why are the floors bouncy or soft in my crawl space home?","answer":"Bouncy or soft floors usually point to framing or support problems, such as moisture-damaged wood or supports that are missing, too far apart or failing.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors","section":"signs"},{"question":"Bouncy or soft floors: Where does this sign appear?","answer":"Bouncy or soft floors are a sign for houses with a wood floor system over a crawl space: pier and beam crawl space homes and manufactured homes on piers. In these houses the floor is built from joists (parallel wood framing members) resting on beams, which rest on piers or posts.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#where-does-this-sign-appear","section":"signs","topic":"Bouncy or soft floors"},{"question":"What can bouncy floors mean?","answer":"Toughness is lost first, then bending strength, then all strength properties; A 5-10% loss of wood weight to decay matched a 20-80% drop in mechanical properties in laboratory tests; At 10% weight loss, bending strength fell about 40%.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#what-can-bouncy-floors-mean","section":"signs","topic":"Bouncy or soft floors"},{"question":"Bouncy or soft floors: What gets checked?","answer":"Home inspection standards call for inspecting the crawl space and structural components and reporting:","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#what-gets-checked","section":"signs","topic":"Bouncy or soft floors"},{"question":"How are bouncy floors repaired?","answer":"Repairs depend on which mechanism is found. Crawl space repair covers adding or replacing posts and piers, sistering or replacing damaged joists and shimming beams. Where moisture is the driver, crawl space encapsulation and drainage solutions address the source of the water.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#how-are-bouncy-floors-repaired","section":"signs","topic":"Bouncy or soft floors"},{"question":"Are bouncy floors a foundation problem?","answer":"In crawl space homes, bounce or softness usually comes from the wood framing or the supports under the floor rather than from soil movement. Moisture damage to wood and missing or failing supports are the two main causes this site tracks.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#faq-1","section":"signs","topic":"Bouncy or soft floors"},{"question":"What does an inspector check under a bouncy floor?","answer":"Home inspection standards call for inspecting the crawl space and structural components and reporting wood in contact with or near soil, signs of active water penetration and cut or notched framing that may be a structural concern.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#faq-2","section":"signs","topic":"Bouncy or soft floors"},{"question":"Bouncy or soft floors: Can wood floor framing sag over time even without damage?","answer":"Yes. A U.S. Forest Products Laboratory study of wood roof trusses under constant load found total deflection grew to about two to three times the initial deflection, with about half of the time-related sag in the first year.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#faq-3","section":"signs","topic":"Bouncy or soft floors"},{"question":"Bouncy or soft floors: How wet does wood have to be to rot?","answer":"Decay fungi need wood above its fiber saturation point, about 30% moisture content, which takes free water from rain, condensation or wet ground contact. Air-dried wood is usually at or below 20% and generally does not decay.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#faq-4","section":"signs","topic":"Bouncy or soft floors"},{"question":"Bouncy or soft floors: Can a joist that looks fine still be weak from rot?","answer":"Yes. Early decay is often visible only under a microscope, yet laboratory tests show a 5-10% loss of wood weight can cut mechanical properties by 20-80%.","url":"https://terrabrain.vercel.app/signs/bouncy-or-soft-floors#faq-5","section":"signs","topic":"Bouncy or soft floors"},{"question":"Why are the floors sagging over my crawl space?","answer":"Interior pads settle, wood shims crush or rot, or beams and joists are too small or span too far, so the floor sags, bounces or slopes.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl","section":"causes"},{"question":"Sagging crawl space floors: How is a pier-and-beam floor supported?","answer":"A pier-and-beam (crawl space) floor has three layers of support: - Joists, the closely spaced boards that the subfloor is nailed to. - Beams or girders, heavier members that carry the joists. - Interior piers or pads, posts or masonry piers on small footings that hold up the beams, often with wood or steel shims between the pier and the beam to set the height.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#how-is-a-pier-and-beam-floor-supported","section":"causes","topic":"Sagging crawl space floors"},{"question":"Sagging crawl space floors: What are the signs of interior support failure?","answer":"sagging floor between supports; bouncy or soft floors; sloping floors toward the interior.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#what-are-the-signs-of-interior-support-failure","section":"causes","topic":"Sagging crawl space floors"},{"question":"Sagging crawl space floors: How is interior sag different from perimeter settlement?","answer":"When the perimeter foundation drops, floors slope outward toward the exterior walls. When the interior supports fail, the floor sags in the middle or between supports while the perimeter stays near level.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#how-is-interior-sag-different-from-perimeter-settlement","section":"causes","topic":"Sagging crawl space floors"},{"question":"How is a sagging crawl space floor typically fixed?","answer":"The Texas ASCE guidelines list floor shimming, framing repairs, additional supports, restoring the open space under the floor and crawl space moisture control as pier-and-beam repair approaches.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#how-is-a-sagging-crawl-space-floor-typically-fixed","section":"causes","topic":"Sagging crawl space floors"},{"question":"Sagging crawl space floors: Why does my floor sag in the middle of the room?","answer":"In a pier-and-beam house, a sag between supports usually means a beam or joists are spanning too far, have been weakened by notching or decay, or an interior pier or pad under them has settled. Each of these lets the floor drop between or over the supports.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#faq-1","section":"causes","topic":"Sagging crawl space floors"},{"question":"Can interior piers in a crawl space move with the soil?","answer":"Yes. Small interior pads that rest on expansive clay sit within the active zone, the depth of soil whose moisture changes with the seasons, which in Oklahoma has been estimated at roughly 0.5 to 4 meters.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#faq-2","section":"causes","topic":"Sagging crawl space floors"},{"question":"Sagging crawl space floors: What moisture level lets wood framing rot?","answer":"Decay is generally understood to occur above about 30 percent moisture content and not below about 20 percent, so framing that stays damp in a crawl space is at risk.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#faq-3","section":"causes","topic":"Sagging crawl space floors"},{"question":"How are sagging crawl space floors repaired?","answer":"Texas engineering guidelines for pier-and-beam foundations list floor shimming, framing repairs, added supports, restoring the open space under the floor and crawl space moisture control as repair approaches.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#faq-4","section":"causes","topic":"Sagging crawl space floors"},{"question":"Sagging crawl space floors: How much floor deflection is acceptable?","answer":"Engineers often compare floor deflection to the L/360 live-load limit used in the International Residential Code, meaning a span should not bow more than 1/360 of its length.","url":"https://terrabrain.vercel.app/causes/interior-support-and-framing-failure-crawl#faq-5","section":"causes","topic":"Sagging crawl space floors"},{"question":"Why did a 1928 Tulsa basement wall need a full rebuild?","answer":"Years of lateral soil and water pressure bowed the lower block wall inward, so the engineer ruled out crack repair or bracing and called for a rebuild.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild","section":"case-studies"},{"question":"Tulsa basement wall rebuild: What did the house show?","answer":"The house is a one-story wood-frame house without veneer, built about 1928. It has a crawl space under most of it and a partial concrete-block (CMU) basement at the west end, all on a continuous trench footing. The same engineer had inspected it since 2009.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild#what-did-the-house-show","section":"case-studies","topic":"Tulsa basement wall rebuild"},{"question":"Tulsa basement wall rebuild: What did the engineer find was causing it?","answer":"The engineer concluded the wall had failed gradually over years under long-term lateral soil pressure and hydrostatic (water) loading. The soil was presumed to be silty clay with trace sand and moderate expansive potential.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Tulsa basement wall rebuild"},{"question":"Tulsa basement wall rebuild: What repair was specified?","answer":"The engineer stated that crack repair or more bracing would not be adequate. The scope was:","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild#what-repair-was-specified","section":"case-studies","topic":"Tulsa basement wall rebuild"},{"question":"Tulsa basement wall rebuild: What does this case show about Oklahoma foundations?","answer":"Water behind a wall adds load. Building-science guidance for basements calls for a perimeter drain outside the foundation wrapped in geotextile and free-draining backfill or a drainage board to carry groundwater down to it.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Tulsa basement wall rebuild"},{"question":"Why wasn't bracing enough for this basement wall?","answer":"The engineer found the lower part of the wall leaning and bulging inward, worse than at a 2017 inspection. The engineer stated that crack repair or added bracing would not be adequate and called for full reconstruction.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild#faq-1","section":"case-studies","topic":"Tulsa basement wall rebuild"},{"question":"Why didn't the existing steel columns hold the wall?","answer":"They were only bolted to the masonry and had no independent footing, so they moved with the wall instead of restraining it. The engineer called for them to be removed and said any new bracing must be independently supported and engineered.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild#faq-2","section":"case-studies","topic":"Tulsa basement wall rebuild"},{"question":"Tulsa basement wall rebuild: Why does silt end up in the sump?","answer":"Stormwater and soil were entering at the base of the failing wall. The silt ran to the sump and clogged the pump.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1928-basement-wall-rebuild#faq-3","section":"case-studies","topic":"Tulsa basement wall rebuild"},{"question":"Why did a 1953 Tulsa crawl space home need drainage work along with piers?","answer":"Surface water was entering the crawl space and old concrete piers at one corner had stopped holding; the engineer specified steel piers plus drainage fixes.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers","section":"case-studies"},{"question":"Tulsa crawl space water and piers: What did the house show?","answer":"Wood floors slightly uneven, which the engineer considered normal long-term framing sag for the home's age; Concrete piers previously installed at the southeast corner; In the southeast bedroom, cracks and a warped wall under the east window caused by window leaks, and a corner separation at the south window from wall movement.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers#what-did-the-house-show","section":"case-studies","topic":"Tulsa crawl space water and piers"},{"question":"Tulsa crawl space water and piers: What did the engineer find was causing it?","answer":"Surface water was the main cause: the at-grade crawl vent, planters holding water against the walls, downspouts at the foundation and a flat front yard.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Tulsa crawl space water and piers"},{"question":"Tulsa crawl space water and piers: What repair was specified?","answer":"Install new steel piers at the southeast corner, replacing the old concrete piers, as the repair contractor had proposed; Build a masonry curb around the north crawl vent; Grade the north planter down toward the north and remove the east planter.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers#what-repair-was-specified","section":"case-studies","topic":"Tulsa crawl space water and piers"},{"question":"Tulsa crawl space water and piers: What does this case show about Oklahoma foundations?","answer":"Most of this engineer's list was water control, not structure.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Tulsa crawl space water and piers"},{"question":"Tulsa crawl space water and piers: Why did the engineer say to remove the vapor barrier?","answer":"The soil under the existing barrier was damp, and the engineer wanted the crawl space soil to be able to dry once water entry was stopped.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers#faq-1","section":"case-studies","topic":"Tulsa crawl space water and piers"},{"question":"What was wrong with the old piers?","answer":"Concrete piers previously installed at the southeast corner were no longer holding. The engineer endorsed replacing them with new steel piers.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers#faq-2","section":"case-studies","topic":"Tulsa crawl space water and piers"},{"question":"Tulsa crawl space water and piers: Were all the wall cracks caused by the foundation?","answer":"No. Cracking and a warped wall under one bedroom window were traced to a leaking window, which the engineer said to seal.","url":"https://terrabrain.vercel.app/case-studies/tulsa-1953-crawl-space-water-and-failed-concrete-piers#faq-3","section":"case-studies","topic":"Tulsa crawl space water and piers"},{"question":"Why did a 1970 Claremore slab house on a sloped lot crack everywhere?","answer":"The engineer blamed changing moisture in the clay under the footings and slab, and specified perimeter piers, polyurethane slab leveling and a leak test.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane","section":"case-studies"},{"question":"Claremore sloped-lot slab: What did the house show?","answer":"The engineer inspected the house in December 2025. It is a one-story timber-frame house with brick veneer and fiber siding, built about 1970. The garage had been converted to living space and a patio addition abuts the original east wall.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane#what-did-the-house-show","section":"case-studies","topic":"Claremore sloped-lot slab"},{"question":"Claremore sloped-lot slab: What did the engineer find was causing it?","answer":"The engineer attributed the movement to \"variations in the moisture content of the soil beneath the footings and slab,\" describing the soil at foundation level as a mildly active clay. The report also noted the steep slope and the additions, but did not name them as the cause.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Claremore sloped-lot slab"},{"question":"Claremore sloped-lot slab: What repair was specified?","answer":"Piers under the continuous footings at locations shown on the engineer's drawing; Polyurethane slab leveling where the slab is out of level. The exact areas are to be set by the contractor from a floor survey.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane#what-repair-was-specified","section":"case-studies","topic":"Claremore sloped-lot slab"},{"question":"Claremore sloped-lot slab: What does this case show about Oklahoma foundations?","answer":"Clay subsoils formed from shale are common here. The USDA describes the Dennis series, whose type location is in Rogers County, as formed in residuum weathered from Pennsylvanian shale.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Claremore sloped-lot slab"},{"question":"Why test the plumbing before lifting a slab?","answer":"Leaking supply or drain lines add water to the soil under a slab. The engineer called for a licensed plumber to leak-test supply and drain lines and repair any leaks as part of the scope, and cautioned against lifting large areas over plumbing.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane#faq-1","section":"case-studies","topic":"Claremore sloped-lot slab"},{"question":"How were slab cracks to be repaired after leveling?","answer":"By stitching with carbon fiber strips and self-leveling epoxy. If a height difference remained across a crack, the engineer called for saw-cutting at least 6 in. each side and re-pouring.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane#faq-2","section":"case-studies","topic":"Claremore sloped-lot slab"},{"question":"Claremore sloped-lot slab: Is some movement after piering normal?","answer":"The engineer wrote that some minor movement after piers are installed is quite common, and advised waiting several weeks after stabilization before cosmetic repairs.","url":"https://terrabrain.vercel.app/case-studies/claremore-sloped-lot-slab-piers-and-polyurethane#faq-3","section":"case-studies","topic":"Claremore sloped-lot slab"},{"question":"Why did a Bartlesville commercial building need piers and floor leveling?","answer":"Its perimeter had settled while the interior slab heaved; the engineer specified 13 steel piers to shale or rock, then interior leveling, plus gutters.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement","section":"case-studies"},{"question":"Bartlesville heave and settlement: What did the house show?","answer":"Interior floors out of level, sloping from 1/4 in. to 3 in.; doors had been trimmed to fit; On the east unit, cracks of 1/4 to 1 in. and displaced concrete blocks on the south, east and west walls, with soffit trim separations at the southeast and southwest corners; Incomplete, rusted guttering, with downspouts discharging directly against the foundation; spalled curbs and an aged roof.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement#what-did-the-house-show","section":"case-studies","topic":"Bartlesville heave and settlement"},{"question":"Bartlesville heave and settlement: What did the engineer find was causing it?","answer":"The engineer separated two mechanisms. The perimeter of the east unit had settled on its south, east and west sides.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Bartlesville heave and settlement"},{"question":"Bartlesville heave and settlement: What repair was specified?","answer":"13 steel piers on the south, east and west sides of the east unit, per the engineer's sketch. Caulking between veneer and windows was to be removed before lifting; Piers driven deep enough to reach bedrock, blue or gray shale, or dense unweathered stone.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement#what-repair-was-specified","section":"case-studies","topic":"Bartlesville heave and settlement"},{"question":"Bartlesville heave and settlement: What does this case show about Oklahoma foundations?","answer":"A single building can show both heave and settlement. Here the engineer ordered the work so the settled perimeter was piered first and the heaved interior was leveled afterward.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Bartlesville heave and settlement"},{"question":"Can a building settle and heave at the same time?","answer":"Yes. Here the engineer found perimeter settlement on three sides of one unit and heave of the interior slab, and specified piering the perimeter first, then leveling the interior.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement#faq-1","section":"case-studies","topic":"Bartlesville heave and settlement"},{"question":"Bartlesville heave and settlement: How deep did the engineer want the piers?","answer":"Deep enough to reach bedrock, blue or gray shale, or dense unweathered stone. The report described a bearing material, not a fixed depth or pressure.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement#faq-2","section":"case-studies","topic":"Bartlesville heave and settlement"},{"question":"Bartlesville heave and settlement: What else did the engineer recommend besides piers?","answer":"Plumbing leak detection on sewer, supply and shower pans, a new roof, repair of spalled concrete, and a new gutter system with downspout extensions.","url":"https://terrabrain.vercel.app/case-studies/bartlesville-commercial-building-heave-and-settlement#faq-3","section":"case-studies","topic":"Bartlesville heave and settlement"},{"question":"Why did a Bixby engineer want a tree removed before piering a corner?","answer":"Cracking was worst at the corner beside a tree on active clay; the engineer listed tree removal first, then 3 steel piers at least 10 ft below the footing.","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers","section":"case-studies"},{"question":"Bixby tree, then corner piers: What did the house show?","answer":"Stone veneer separations and hairline to 1/4 in. cracks, some previously patched, around the chimney and on the north, south and west walls.","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers#what-did-the-house-show","section":"case-studies","topic":"Bixby tree, then corner piers"},{"question":"Bixby tree, then corner piers: What did the engineer find was causing it?","answer":"Shrink-swell movement of active clay soil, with the tree at the northeast corner as a contributor. No soil report was available.","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Bixby tree, then corner piers"},{"question":"Bixby tree, then corner piers: What repair was specified?","answer":"Remove the tree at the northeast corner; Then underpin the northeast corner with 3 piers, shown at about 9 ft spacing on the plan.","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers#what-repair-was-specified","section":"case-studies","topic":"Bixby tree, then corner piers"},{"question":"Bixby tree, then corner piers: What does this case show about Oklahoma foundations?","answer":"On clay soils, trees draw water out of the ground beneath nearby foundations during dry spells, the clay shrinks, and the result is settlement with cracking that often shows around windows and doors.","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Bixby tree, then corner piers"},{"question":"Bixby tree, then corner piers: In what order did the engineer want the work done?","answer":"Tree removal was recommendation number one. The 3 corner piers were to be installed after the tree was gone.","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers#faq-1","section":"case-studies","topic":"Bixby tree, then corner piers"},{"question":"Bixby tree, then corner piers: Did the slab need repair?","answer":"No. The engineer found the slab movement not severe enough to repair; the garage slab cracks were rated non-structural.","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers#faq-2","section":"case-studies","topic":"Bixby tree, then corner piers"},{"question":"How deep were the piers specified?","answer":"At least 10 ft below the bottom of the footing, driven to refusal on firm strata, with the detail showing bedrock (blue shale).","url":"https://terrabrain.vercel.app/case-studies/bixby-tree-at-corner-remove-before-piers#faq-3","section":"case-studies","topic":"Bixby tree, then corner piers"},{"question":"Why did a Claremore church addition's floor drop 1 to 3 inches?","answer":"The engineer found soil consolidation under the slab and a possible void or plumbing leak, and specified 16 steel piers at least 12 ft deep plus slab support.","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam","section":"case-studies"},{"question":"Claremore church addition slab: What did the building show?","answer":"The engineer inspected the building in April 2025, limiting the inspection to the southeast addition. The building is one-story wood frame with brick veneer. The addition sits on a slab-on-grade with a continuous perimeter spread footing and stem walls.","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam#what-did-the-building-show","section":"case-studies","topic":"Claremore church addition slab"},{"question":"Claremore church addition slab: What did the engineer find was causing it?","answer":"The engineer found consolidation and settlement of the underlying soil beneath the slab in active clay, with a suspected void or under-slab plumbing leak.","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Claremore church addition slab"},{"question":"Claremore church addition slab: What repair was specified?","answer":"Slab:","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam#what-repair-was-specified","section":"case-studies","topic":"Claremore church addition slab"},{"question":"Claremore church addition slab: What does this case show about Oklahoma foundations?","answer":"Leaks are a known cause of localized slab movement. ASCE's homeowner guide for shrink-swell soils states that leaks in sewer or water lines provide a localized source of water that may lead to localized foundation movements.","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Claremore church addition slab"},{"question":"Claremore church addition slab: What lift tolerance did the engineer set?","answer":"The slab was to be lifted and leveled to within 1/2 to 3/4 in.","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam#faq-1","section":"case-studies","topic":"Claremore church addition slab"},{"question":"Claremore church addition slab: Why test plumbing before and after foundation repair?","answer":"The engineer suspected a plumbing leak under the slab and required a plumbing test both before and after the repair.","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam#faq-2","section":"case-studies","topic":"Claremore church addition slab"},{"question":"When does a cracked slab get replaced instead of stitched?","answer":"The engineer specified stitching for ordinary cracks, and replacing the slab with #3 bars at 18 in. each way, doweled to the existing concrete, if it is heavily cracked.","url":"https://terrabrain.vercel.app/case-studies/claremore-church-addition-slab-drop-piers-and-foam#faq-3","section":"case-studies","topic":"Claremore church addition slab"},{"question":"Why did a Tulsa house with 23 piers need pier work again in 2026?","answer":"Footings kept moving at existing pier locations, and drainage was poor. The engineer specified adjusting the old piers or adding new steel piers, plus gutters.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again","section":"case-studies"},{"question":"Tulsa piers needing readjustment: What did the house show?","answer":"The house is a one-story wood-frame residence with brick veneer and siding. It sits on poured concrete footings with stem walls and a slab floor. The file records a long repair history:","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again#what-did-the-house-show","section":"case-studies","topic":"Tulsa piers needing readjustment"},{"question":"Tulsa piers needing readjustment: What did the engineer find was causing it?","answer":"The record describes continued exterior footing movement at the existing pier locations, together with poor surface drainage around the house. This was the second adjustment cycle in about four years after the 2002 installation.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Tulsa piers needing readjustment"},{"question":"Tulsa piers needing readjustment: What repair was specified?","answer":"Install steel piers or adjust existing piers at the footings at the sketch locations.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again#what-repair-was-specified","section":"case-studies","topic":"Tulsa piers needing readjustment"},{"question":"Tulsa piers needing readjustment: What does this case show about Oklahoma foundations?","answer":"Perimeter water is a recurring driver. ASCE's homeowner guide for shrink-swell soils recommends keeping soil sloped away on all sides (at least 3 inches of fall in 5 feet) and discharging downspouts at least 3 feet from the foundation.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Tulsa piers needing readjustment"},{"question":"Can existing foundation piers be adjusted instead of replaced?","answer":"The engineer's scope allowed either: adjust the existing pier at each marked location, or, if a pier is not in place or cannot be adjusted, place a new steel pier there.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again#faq-1","section":"case-studies","topic":"Tulsa piers needing readjustment"},{"question":"Will adjusting piers return the house to its original level?","answer":"The engineer stated that full recovery to the original position is not guaranteed.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again#faq-2","section":"case-studies","topic":"Tulsa piers needing readjustment"},{"question":"Why does drainage matter on a house that already has piers?","answer":"The engineer found the grade did not slope away enough and gutters, splash pads and downspout extensions were missing, and called for re-grading and gutters at all eaves along with the pier work.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-house-existing-piers-need-adjusting-again#faq-3","section":"case-studies","topic":"Tulsa piers needing readjustment"},{"question":"Why did a Tulsa slab home get wall piers but no slab repair?","answer":"Brick cracks showed the east wall footing had moved, but floor differential was under 1 in., so the engineer specified 7 steel piers and no slab work.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers","section":"case-studies"},{"question":"Tulsa east wall piers: What did the house show?","answer":"Brick cracks on the east wall.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#what-did-the-house-show","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"Tulsa east wall piers: What did the engineer find was causing it?","answer":"Shrink-swell movement of active clay soil under the east wall's perimeter footing. A plumbing leak was not confirmed, and the engineer asked for one to be ruled out.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"Tulsa east wall piers: What repair was specified?","answer":"A plumbing test of the supply and drain lines; 7 piers along the east wall at 8 ft spacing on the plan; Steel piers only; any other system needed the engineer's approval.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#what-repair-was-specified","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"Tulsa east wall piers: What happened on the job?","answer":"The repair contractor installed the piers in spring 2025, shortly after the report was issued.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#what-happened-on-the-job","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"Tulsa east wall piers: What does this case show about Oklahoma foundations?","answer":"On a floating slab, the perimeter footing and the interior slab are separate pieces and can move by different amounts.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"Tulsa east wall piers: Why didn't the engineer repair the slab?","answer":"The elevation survey found less than 1 in. of differential across the floor, which the engineer judged minor, so only the east wall footing was piered.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#faq-1","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"How deep did the piers have to go?","answer":"At least 12 ft below the bottom of the footing, driven to refusal on firm strata; the detail showed refusal on bedrock (blue shale).","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#faq-2","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"Tulsa east wall piers: What records did the engineer require from the crew?","answer":"A log for each pier giving depth, pier type, diameter, driving pressure and amount of lift.","url":"https://terrabrain.vercel.app/case-studies/tulsa-slab-home-east-wall-seven-piers#faq-3","section":"case-studies","topic":"Tulsa east wall piers"},{"question":"Why did an Edmond slab house settle again two years after piering?","answer":"The engineer found more settlement at piers installed in 2023 plus erosion and poor grading. The fix: adjust or replace 7 piers, add 1, and improve drainage.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers","section":"case-studies"},{"question":"Edmond settlement after piers: What did the house show?","answer":"The engineer inspected the house in November 2025 and issued the report in December. It is a one-story house of about 1,035 sq ft, built about 1967, on a slab-on-grade.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers#what-did-the-house-show","section":"case-studies","topic":"Edmond settlement after piers"},{"question":"Edmond settlement after piers: What did the engineer find was causing it?","answer":"The engineer described continued settlement at pier locations and stressed surface water, grading and drainage. Possible under-slab leaks were also raised.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Edmond settlement after piers"},{"question":"Edmond settlement after piers: What repair was specified?","answer":"Adjust or replace 7 of the existing piers shown on the report's figure. Replacement piers must be steel; Add 1 new pier on the north side \"due to excessive spacing\"; Afterward, repair drywall and trim, seal exterior cracks, tuck-point, and use elastomeric caulk.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers#what-repair-was-specified","section":"case-studies","topic":"Edmond settlement after piers"},{"question":"Edmond settlement after piers: What does this case show about Oklahoma foundations?","answer":"OKC-area soils include clay subsoils over shale. The USDA describes the Bethany series, with its type location in Oklahoma County, as formed in loess or alluvium over Permian shale. Its subsoil is silty clay loam to clay with 35 to 45 percent clay.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Edmond settlement after piers"},{"question":"Edmond settlement after piers: Why would an engineer add a pier to an existing pier layout?","answer":"In this case the engineer added one new pier on the north side 'due to excessive spacing' between the existing piers.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers#faq-1","section":"case-studies","topic":"Edmond settlement after piers"},{"question":"Edmond settlement after piers: What grading did the engineer suggest?","answer":"Slope the ground away from the house at 1 in. per 12 in. within 4 ft, extend downspouts at least 36 in. or pipe them underground to daylight, and remove beds that trap water.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers#faq-2","section":"case-studies","topic":"Edmond settlement after piers"},{"question":"Edmond settlement after piers: Is a ceiling crack always a foundation problem?","answer":"No. In this house the engineer attributed a living and kitchen ceiling crack to truss movement and described it as not structural.","url":"https://terrabrain.vercel.app/case-studies/edmond-1967-slab-settlement-after-2023-piers#faq-3","section":"case-studies","topic":"Edmond settlement after piers"},{"question":"Why did an engineer pick helical piers for a Tulsa crawl space home?","answer":"A clay tile stem wall and a light converted garage gave push piers little to push against, so the engineer specified 10 helical piers at least 20 ft deep.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall","section":"case-studies"},{"question":"Tulsa helical piers, clay tile wall: What did the house show?","answer":"Brick veneer separations over 1/2 in. on the north side, and veneer-to-trim gaps over 1/4 in. at the northwest and southwest corners; The south door of the converted garage out of square, and interior drywall cracks; Previous underpinning along the north, west and south sides, with no documentation available.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall#what-did-the-house-show","section":"case-studies","topic":"Tulsa helical piers, clay tile wall"},{"question":"Tulsa helical piers, clay tile wall: What did the engineer find was causing it?","answer":"With no geotechnical data, the engineer presumed moisture-reactive clay whose shrink-swell causes loss of support and uplift at the perimeter footing. The incomplete gutter system contributed; possible fill or slope issues were noted as beyond the report's scope.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Tulsa helical piers, clay tile wall"},{"question":"Tulsa helical piers, clay tile wall: What repair was specified?","answer":"10 exterior piers under the perimeter footings. Helical piers were specifically recommended because of the clay tile stem wall and the light weight of the garage.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall#what-repair-was-specified","section":"case-studies","topic":"Tulsa helical piers, clay tile wall"},{"question":"Tulsa helical piers, clay tile wall: What does this case show about Oklahoma foundations?","answer":"The project record lists the Coweta series mapped at the site. USDA describes Coweta as a shallow, well-drained soil formed from soft Pennsylvanian sandstone interbedded with shale, with the soft rock typically about 15 in. down and harder sandstone at 2 to 5 ft in some places.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Tulsa helical piers, clay tile wall"},{"question":"Why helical piers instead of steel push piers?","answer":"The engineer cited the clay tile stem wall and the light weight of the converted garage. Push piers rely on the building's weight as reaction; helical piers are screwed in and do not.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall#faq-1","section":"case-studies","topic":"Tulsa helical piers, clay tile wall"},{"question":"Tulsa helical piers, clay tile wall: What happens if bedrock is shallower than the 20 ft minimum?","answer":"The spec allowed a shallower depth only with the engineer's approval, and required calling the engineer if a stronger stratum such as bedrock or weathered shale was not reached.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall#faq-2","section":"case-studies","topic":"Tulsa helical piers, clay tile wall"},{"question":"Tulsa helical piers, clay tile wall: What did the engineer say about the earlier underpinning?","answer":"The house had been underpinned before on three sides with no documentation available. The engineer asked that existing piers be exposed in at least 3 places if a pier-and-grade-beam foundation turned up.","url":"https://terrabrain.vercel.app/case-studies/tulsa-crawl-space-home-helical-piers-clay-tile-stem-wall#faq-3","section":"case-studies","topic":"Tulsa helical piers, clay tile wall"},{"question":"Why did Oklahoma earthquakes increase, and can they damage houses?","answer":"Quakes rose sharply after 2009, mainly linked to deep disposal of oil-and-gas wastewater; moderate quakes can crack plaster and masonry.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma","section":"guides"},{"question":"What happened to Oklahoma's earthquake activity?","answer":"The Oklahoma Geological Survey (OGS) states that a large area of the state has had greatly increased seismic activity since 2009, and especially since 2013. The OGS describes these earthquakes as induced primarily by deep injection of produced water from oil and gas operations.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#what-happened-to-oklahoma-s-earthquake-activity","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"What are the largest recorded Oklahoma earthquakes?","answer":"Source: OGS top-ten list. Four of the state's ten largest listed events occurred in 2016.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#what-are-the-largest-recorded-oklahoma-earthquakes","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Oklahoma induced earthquakes: How do magnitude and intensity differ?","answer":"Magnitude measures the energy released at the source. One number per earthquake; Intensity, on the Modified Mercalli Intensity (MMI) scale, describes shaking effects at a particular place. It varies with distance and ground conditions.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#how-do-magnitude-and-intensity-differ","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Oklahoma induced earthquakes: Where can the earthquake record be checked?","answer":"OGS earthquake catalogs: yearly lists of Oklahoma events.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#where-can-the-earthquake-record-be-checked","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Why do earthquakes matter for foundations?","answer":"In the moderate Oklahoma quakes, damage concentrated in masonry.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#why-do-earthquakes-matter-for-foundations","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Why did Oklahoma start having so many earthquakes?","answer":"The Oklahoma Geological Survey links the increase to deep injection of produced water, the salty wastewater that comes up with oil and gas. Seismic activity increased greatly after 2009 and especially after 2013.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#faq-1","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"What is the largest earthquake recorded in Oklahoma?","answer":"The September 3, 2016 Pawnee earthquake. The Oklahoma Geological Survey's top-ten list gives it magnitude 5.8, while its initial fact sheet listed 5.6.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#faq-2","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Oklahoma induced earthquakes: What level of shaking damages a house?","answer":"On the Modified Mercalli Intensity scale, level VI is described as minor damage such as falling plaster and a few cracks. Level VII, which the 2011 Prague earthquake reached, involves more significant damage.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#faq-3","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Oklahoma induced earthquakes: How can I find out if an earthquake shook my area?","answer":"The Oklahoma Geological Survey publishes earthquake catalogs and a recent-earthquake map, and the USGS Did You Feel It? system collects reports from people to map shaking.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#faq-4","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Is fracking causing Oklahoma's earthquakes?","answer":"Mostly no. The USGS says disposal of wastewater produced with oil is the primary cause, and only about 1 to 2 percent of Oklahoma earthquakes can be linked to hydraulic fracturing.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#faq-5","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Are Oklahoma earthquakes still happening?","answer":"Yes, but far less often. The Oklahoma Geological Survey counted 15 earthquakes of magnitude 3.0 or greater in 2022, compared with 903 reported for 2015.","url":"https://terrabrain.vercel.app/guides/induced-seismicity-in-oklahoma#faq-6","section":"guides","topic":"Oklahoma induced earthquakes"},{"question":"Why did one corner of a Mannford walk-out basement house settle?","answer":"The engineer tied it to possible fill consolidation on the south side and roof runoff concentrated at the southwest corner, and specified 8 steel piers.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff","section":"case-studies"},{"question":"Mannford corner settlement: What did the house show?","answer":"The engineer inspected the house in April 2022. The building is a one-story timber-frame house with brick veneer, a partial walk-out basement, and an attached garage that was built as an addition.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#what-did-the-house-show","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Mannford corner settlement: What did the engineer find was causing it?","answer":"The engineer concluded the house had minor long-term settlement along the south elevation, with possible consolidation of fill as a factor. Roof runoff was concentrated at the southwest corner.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Mannford corner settlement: What repair was specified?","answer":"The report listed five items:","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#what-repair-was-specified","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Mannford corner settlement: What happened on the job?","answer":"The record shows the repair was carried out in April 2022, within about two weeks of the engineer's report.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#what-happened-on-the-job","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Mannford corner settlement: What does this case show about Oklahoma foundations?","answer":"Roof water is a point source. A roof collects rain over a large area and the downspouts drop it in a few spots. ASCE's homeowner guide for shrink-swell soils recommends gutters and downspouts that discharge at least 3 feet from the foundation into well-drained areas.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Mannford corner settlement: Can roof water alone damage a foundation and a retaining wall?","answer":"In this case the engineer found roof runoff concentrated at the southwest corner and named it as a contributor both to settlement at that corner and to the buckling of a block retaining wall below it.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#faq-1","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Mannford corner settlement: Why did the engineer specify non-perforated drain lines?","answer":"The goal was to carry downspout water past the retaining wall to the downhill side. A solid (non-perforated) pipe moves the water to its outlet instead of releasing it into the soil along the way.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#faq-2","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Mannford corner settlement: What does a gap between a window frame and brick mean?","answer":"Here a 1/2 in. gap between a window frame and the brick, together with brick cracks at the same corner, was read by the engineer as settlement at the southwest corner.","url":"https://terrabrain.vercel.app/case-studies/mannford-walkout-basement-corner-settlement-roof-runoff#faq-3","section":"case-studies","topic":"Mannford corner settlement"},{"question":"Why did only one side of a 1958 brick home in The Village need piers?","answer":"The east side had settled up to about 1.2 in. on highly plastic clay, so the engineer specified 4 steel piers there and monitoring on the west side.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers","section":"case-studies"},{"question":"The Village east-side piers: What did the house show?","answer":"On the east side the engineer recorded brick cracks of 1/32 to 1/8 in. under the windows, brick pulled about 1/8 in. off the window frame near the southeast corner, a 3/8 in. gap at the frieze trim at that same corner, and interior cracks above the east bedroom windows.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#what-did-the-house-show","section":"case-studies","topic":"The Village east-side piers"},{"question":"The Village east-side piers: What did the engineer find was causing it?","answer":"The engineer named highly plastic clay soil, settling through consolidation and moving with moisture change. Rain and drought cycles, drainage, plumbing leaks and trees were listed as the moisture drivers.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#what-did-the-engineer-find-was-causing-it","section":"case-studies","topic":"The Village east-side piers"},{"question":"The Village east-side piers: What repair was specified?","answer":"Underpin the east side with 4 steel piers, \"hydraulically driven until the foundation starts lifting\"; Maximum pier spacing of 8 ft; the plan was not tied to any proprietary pier system; A caution against over-lifting.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#what-repair-was-specified","section":"case-studies","topic":"The Village east-side piers"},{"question":"The Village east-side piers: What happened on the job?","answer":"The repair contractor installed the piers in 2025. Its markup of the engineer's plan logged the piers at roughly 9,500 psi driving pressure and recorded about 1/4 to 1/2 in. of lift.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#what-happened-on-the-job","section":"case-studies","topic":"The Village east-side piers"},{"question":"The Village east-side piers: What does this case show about Oklahoma foundations?","answer":"The soil mapped for the area in the project record is the Renthin series.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#what-does-this-case-show-about-oklahoma-foundations","section":"case-studies","topic":"The Village east-side piers"},{"question":"Why weren't piers put on the whole house?","answer":"The engineer judged the west-side cracks (1/32 to 1/16 in.) not significant and recommended monitoring them, with re-evaluation only if movement continued.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#faq-1","section":"case-studies","topic":"The Village east-side piers"},{"question":"How did the engineer decide when to stop driving the piers?","answer":"The plan said to drive the steel piers hydraulically until the foundation started lifting, at no more than 8 ft spacing, and warned against over-lifting.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#faq-2","section":"case-studies","topic":"The Village east-side piers"},{"question":"The Village east-side piers: What did the pier log show?","answer":"The repair contractor's markup logged the piers at roughly 9,500 psi driving pressure, with about 1/4 to 1/2 in. of lift.","url":"https://terrabrain.vercel.app/case-studies/the-village-1958-brick-home-east-side-piers#faq-3","section":"case-studies","topic":"The Village east-side piers"},{"question":"Why do basement walls crack horizontally and bow inward?","answer":"Soil pushes sideways on basement walls, and wet backfill and swelling clay add pressure. When the push exceeds the wall's strength, it cracks, bows or slides.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls","section":"causes"},{"question":"What kinds of sideways pressure act on walls?","answer":"A below-grade wall carries a horizontal load from the ground beside it. That load has three parts:","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#what-kinds-of-sideways-pressure-act-on-walls","section":"causes","topic":"Bowing basement walls"},{"question":"How do basement and retaining walls fail?","answer":"When water-saturated soil presses against the outside of a foundation wall, the wall is pushed inward, and the inward bow opens a crack.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#how-do-basement-and-retaining-walls-fail","section":"causes","topic":"Bowing basement walls"},{"question":"Bowing basement walls: What are the signs of wall pressure damage?","answer":"a horizontal crack or inward bow in a basement wall; water at the cove joint or efflorescence, the white mineral deposit left when water seeps through masonry and evaporates; a horizontal crack at the brick ledge or slab edge.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#what-are-the-signs-of-wall-pressure-damage","section":"causes","topic":"Bowing basement walls"},{"question":"Bowing basement walls: How do pressure cracks differ from shrinkage cracks?","answer":"Not every basement wall crack comes from soil pressure. New concrete shrinks as it dries, and temperature changes make it expand and contract; when that movement is restrained, cracks form. Diagonal cracks at window, door and other opening corners usually come from shrinkage.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#how-do-pressure-cracks-differ-from-shrinkage-cracks","section":"causes","topic":"Bowing basement walls"},{"question":"Bowing basement walls: How is a pushed-in wall typically fixed?","answer":"Reduce the water. The concrete industry advises finishing grade so water drains away from the foundation and installing waterproofing and drainage so water does not build up against walls. See drainage solutions; Reinforce or rebuild the wall.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#how-is-a-pushed-in-wall-typically-fixed","section":"causes","topic":"Bowing basement walls"},{"question":"What causes a horizontal crack in a basement wall?","answer":"Horizontal cracks typically form when soil outside the wall, often saturated with water, pushes the wall inward. InterNACHI describes these cracks as usually horizontal, wider than hairline and often showing signs of water intrusion.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#faq-1","section":"causes","topic":"Bowing basement walls"},{"question":"What is hydrostatic pressure on a basement wall?","answer":"Hydrostatic pressure is the pressure of water in saturated soil pushing against a foundation wall or slab. Standing water along a foundation can push on a wall beyond the pressure it was designed for.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#faq-2","section":"causes","topic":"Bowing basement walls"},{"question":"Are all basement wall cracks a structural problem?","answer":"No. Concrete shrinks as it dries, and diagonal cracks at window and door corners usually come from shrinkage. Typical warranties call for repair when cracks leak, show measurable displacement or are wider than 1/8 inch.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#faq-3","section":"causes","topic":"Bowing basement walls"},{"question":"Why does clay backfill make basement wall pressure worse?","answer":"Expansive clay swells when it takes on water. In Oklahoma benchmark soils such as Bethany, Kirkland and Norge, the fine clays are dominantly montmorillonitic (smectite), a swelling clay mineral, so wet clay backfill can add swelling pressure to the normal weight of the soil.","url":"https://terrabrain.vercel.app/causes/lateral-earth-swell-and-hydrostatic-pressure-on-walls#faq-4","section":"causes","topic":"Bowing basement walls"},{"question":"Why do cracks open and close with the seasons?","answer":"Expansive clay shrinks as it dries and swells as it rewets, so the house moves with it and cracks widen in dry months and tighten in wet months.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally","section":"signs"},{"question":"Why do cracks open and close?","answer":"Expansive clay swells when it gets wet and shrinks when it dries, creating a repeating cycle of movement in the upper soil. The zone of seasonal moisture change can extend from 3 to 40 feet deep depending on the site.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#why-do-cracks-open-and-close","section":"signs","topic":"Seasonal opening cracks"},{"question":"What is Oklahoma's seasonal cycle?","answer":"More than 75% of Oklahoma has bedrock that can produce expansive soils, including clay-rich shales that can swell to 1.5 to 2 times their dry volume when wet. Soil moisture drops faster during hot, dry periods than during cool, wet ones.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#what-is-oklahoma-s-seasonal-cycle","section":"signs","topic":"Seasonal opening cracks"},{"question":"Seasonal opening cracks: What mechanisms produce it?","answer":"Engineering guidance on expansive soil notes that lack of watering in drought, which dries the clay, can be more damaging than overwatering, and that the goal is steady soil moisture.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#what-mechanisms-produce-it","section":"signs","topic":"Seasonal opening cracks"},{"question":"How do you track a seasonal crack?","answer":"Mark the ends of the crack and two or three measuring points along it; Measure width at the same points with a crack gauge or ruler, or install a crack monitor across it; Photograph each point with a scale in view.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#how-do-you-track-a-seasonal-crack","section":"signs","topic":"Seasonal opening cracks"},{"question":"Seasonal opening cracks: What does it rule in and out?","answer":"Seasonal opening and closing points toward moisture-driven soil movement. It argues against causes that happen once, such as a single earthquake or impact, which tend to leave fresh, clean-edged cracks that do not cycle; see fresh, clean-edged cracks appearing suddenly.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#what-does-it-rule-in-and-out","section":"signs","topic":"Seasonal opening cracks"},{"question":"Seasonal opening cracks: What are the next steps?","answer":"Plot the cracks on an elevation survey, compare them with the distress pattern library, and use the symptom matrix.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#what-are-the-next-steps","section":"signs","topic":"Seasonal opening cracks"},{"question":"Why do my cracks get bigger in summer and smaller in winter?","answer":"On expansive clay, soil shrinks as it dries in hot weather and swells when it rewets, so the foundation moves in a yearly cycle. Cracks in the house open and close with that movement.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#faq-1","section":"signs","topic":"Seasonal opening cracks"},{"question":"Seasonal opening cracks: Does a crack that closes in winter mean the problem fixed itself?","answer":"Not necessarily. Texas monitoring of slabs on expansive clay found partial recovery in winter after summer settlement, so the crack may reopen the next dry season.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#faq-2","section":"signs","topic":"Seasonal opening cracks"},{"question":"Seasonal opening cracks: How long should I monitor a crack?","answer":"At least a full year, so both the driest and wettest parts of the cycle are captured. Readings every month or two at the same marked points work well.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#faq-3","section":"signs","topic":"Seasonal opening cracks"},{"question":"Can trees make seasonal cracks worse?","answer":"Yes. Trees draw the most water in the growing season, and monitoring has found that drought during the growing season makes slab settlement worse.","url":"https://terrabrain.vercel.app/signs/cracks-that-open-and-close-seasonally#faq-4","section":"signs","topic":"Seasonal opening cracks"},{"question":"Why do driveways, patios and sidewalks move in Oklahoma?","answer":"Flatwork is thin, lightly loaded and sits on the soil, so swelling clay lifts it and drying or washed-out soil lets it drop more readily than the house.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs","section":"foundations"},{"question":"What counts as flatwork?","answer":"Driveways and garage aprons; Sidewalks and front walks; Patios and back slabs.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#what-counts-as-flatwork","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"Why does flatwork move so much?","answer":"Swelling soils lift and crack lightly loaded strip footings and frequently cause distress in floor slabs. Clay-rich soils can swell 10% or more by volume when wetted, and cracked garage slabs, driveways, sidewalks and patios are among the most common signs of swelling soil.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#why-does-flatwork-move-so-much","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"Driveways, patios and flatwork: Which concrete details matter?","answer":"Adding 2 gallons of water per cubic yard makes concrete about 10% weaker and increases shrinkage about 20%; Exterior exposed slabs carry a minimum strength of 3,000 psi in the residential code, compared with 2,500 psi for interior footings and basement slabs; Oklahoma's 2024 code adoption exempts interior slabs on grade and enclosed garage slabs from the air-entrainment requirement.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#which-concrete-details-matter","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"How does flatwork affect foundation drainage?","answer":"The residential code requires the ground to fall at least 6 in within the first 10 ft from the foundation, and requires impervious surfaces such as concrete within 10 ft of the building to slope at least 2% away from it.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#how-does-flatwork-affect-foundation-drainage","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"What are the repair options for flatwork?","answer":"Lifting settled slabs by injection: slabjacking and polyurethane; Filling voids from washout: void and compaction grouting; Re-sloping or redirecting water: drainage solutions.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#what-are-the-repair-options-for-flatwork","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"Driveways, patios and flatwork: Why does my driveway or patio crack and lift?","answer":"Flatwork is thin and lightly loaded, so swelling clay underneath can lift it easily, and shrinking or washed-out soil can let it drop. Concrete also shrinks as it cures, which causes cracks that are not caused by soil movement.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#faq-1","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"Driveways, patios and flatwork: Should a patio slope toward or away from the house?","answer":"The residential code requires impervious surfaces within 10 feet of the foundation to slope at least 2 percent away from the building, so water drains away instead of toward the foundation.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#faq-2","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"Driveways, patios and flatwork: Is a cracked sidewalk a sign of foundation trouble?","answer":"Not necessarily. Cracked sidewalks, driveways and patios are common on expansive soil, and flatwork usually rests on the soil without deep footings, so it moves more than the house does.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#faq-3","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"Driveways, patios and flatwork: Can exterior concrete be damaged by freezing in Oklahoma?","answer":"Yes. Water that freezes inside concrete expands about 9 percent, which can crack and spall the surface, especially where water ponds on the slab.","url":"https://terrabrain.vercel.app/foundations/flatwork-and-exterior-slabs#faq-4","section":"foundations","topic":"Driveways, patios and flatwork"},{"question":"Why do foundation edges rise after heavy rain?","answer":"When soil at the perimeter gets wetter than soil under the middle, expansive clay swells and lifts the foundation edges, leaving a dish shape.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift","section":"causes"},{"question":"How does edge lift happen?","answer":"Heave is soil expanding as water is added to expansive clay. Engineers describe seasonal moisture gain causing the soil to swell and push the perimeter of a slab up. Clay soils do not move if their moisture stays constant; it is changes in moisture that cause the movement.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#how-does-edge-lift-happen","section":"causes","topic":"Edge lift after rain"},{"question":"Edge lift after rain: What happens when trees near the house are removed?","answer":"When established trees near a house are removed, the soil they had been drying can rewet. Texas engineering guidelines note that tree removal may stop shrinkage or partly restore lowered areas but can also cause upheaval, and that a waiting period may be recommended.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#what-happens-when-trees-near-the-house-are-removed","section":"causes","topic":"Edge lift after rain"},{"question":"What Oklahoma conditions lead to edge lift?","answer":"Nearly all of Oklahoma has medium or high soil swelling potential, and OSU testing of western Oklahoma benchmark soils found their fine clays dominantly montmorillonite, a smectite clay that swells strongly when wet, most of all in the Kirkland soil.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#what-oklahoma-conditions-lead-to-edge-lift","section":"causes","topic":"Edge lift after rain"},{"question":"What are the signs of edge lift?","answer":"stair-step brick cracks wider at the bottom; water ponding near the foundation; cracks that open and close seasonally.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#what-are-the-signs-of-edge-lift","section":"causes","topic":"Edge lift after rain"},{"question":"How is edge lift told apart from look-alikes?","answer":"A single elevation survey shows shape at one moment; repeated surveys show how it is changing.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#how-is-edge-lift-told-apart-from-look-alikes","section":"causes","topic":"Edge lift after rain"},{"question":"How is edge lift typically addressed?","answer":"Remove the perimeter water. Drainage changes address the source of wetting; see drainage solutions; Monitor. Texas guidelines note that non-structural measures and monitoring may be prudent before or instead of structural repairs; Limit soil swelling.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#how-is-edge-lift-typically-addressed","section":"causes","topic":"Edge lift after rain"},{"question":"Can rain make my foundation rise?","answer":"Yes. When expansive clay at the perimeter of a house takes on water, it swells and can push the edges of the foundation up. Engineers describe seasonal moisture gain pushing the slab perimeter upward.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#faq-1","section":"causes","topic":"Edge lift after rain"},{"question":"Why do the edges of a slab lift more easily than the middle?","answer":"The corners and edges of a uniformly loaded slab press on the soil with much less force than the center, about one-fourth as much at the corners in one engineering analysis, so swelling soil lifts them more easily.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#faq-2","section":"causes","topic":"Edge lift after rain"},{"question":"What sends water to the edges of a house?","answer":"Common sources include landscape irrigation, poor drainage, leaking pipes, groundwater and extended wet weather. Lawn and garden watering can wet the soil outside a house while the soil under it stays drier.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#faq-3","section":"causes","topic":"Edge lift after rain"},{"question":"Edge lift after rain: Can cutting down a tree make a foundation heave?","answer":"It can. Texas engineering guidelines note that removing trees near a foundation may restore some lowered areas but can also cause upheaval as the soil rewets, and sometimes recommend a waiting period.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#faq-4","section":"causes","topic":"Edge lift after rain"},{"question":"Should piers be installed to stop edge lift?","answer":"Edge lift is driven by water reaching the soil, so the water source is the first thing evaluated. Texas engineering guidelines note that non-structural measures and monitoring may be prudent before or instead of structural repair.","url":"https://terrabrain.vercel.app/causes/perimeter-wetting-heave-edge-lift#faq-5","section":"causes","topic":"Edge lift after rain"},{"question":"Why do houses on Oklahoma hillsides slowly move downhill?","answer":"Clay on a slope creeps downhill a little each wet-dry season, and creeks cutting the toe remove support, pulling a house outward and down on its downhill side.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement","section":"causes"},{"question":"What is slope creep?","answer":"Creep is an imperceptibly slow, steady downhill movement of soil or rock. It happens when the stress on a slope is large enough to deform the soil permanently but too small to cause a sudden slide. The U.S. Geological Survey describes three kinds:","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#what-is-slope-creep","section":"causes","topic":"Hillside slope creep"},{"question":"What drives slope creep?","answer":"For creek-side lots, see erosion, creeks and slopes and creeks and flood history.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#what-drives-slope-creep","section":"causes","topic":"Hillside slope creep"},{"question":"What are the warning signs of slope creep?","answer":"Signs of creep include curved tree trunks, bent fences or retaining walls, tilted poles or fences, and small ripples or ridges in the soil.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#what-are-the-warning-signs-of-slope-creep","section":"causes","topic":"Hillside slope creep"},{"question":"How common is slope movement in Oklahoma?","answer":"The Oklahoma Geological Survey reports that most landslides occur in the eastern third of Oklahoma, where the wetter climate and steeper terrain make them more likely.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#how-common-is-slope-movement-in-oklahoma","section":"causes","topic":"Hillside slope creep"},{"question":"What setbacks from slopes do codes require?","answer":"Building codes based on the International Residential Code (Section R403.1.7) set two common distances:","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#what-setbacks-from-slopes-do-codes-require","section":"causes","topic":"Hillside slope creep"},{"question":"How is slope movement repaired?","answer":"Slope movement is treated as both a slope problem and a foundation problem.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#how-is-slope-movement-repaired","section":"causes","topic":"Hillside slope creep"},{"question":"What is soil creep?","answer":"Creep is a very slow, steady downhill movement of soil or rock on a slope, too gradual to see directly. It happens when the stress on the slope is enough to deform the soil permanently but not enough to cause a sudden slide.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#faq-1","section":"causes","topic":"Hillside slope creep"},{"question":"What are the signs of creep on a property?","answer":"The U.S. Geological Survey lists curved tree trunks, bent fences or retaining walls, tilted poles or fences, and small ripples or ridges in the soil as signs of creep.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#faq-2","section":"causes","topic":"Hillside slope creep"},{"question":"Hillside slope creep: Where are landslides most common in Oklahoma?","answer":"The Oklahoma Geological Survey reports that most landslides occur in the eastern third of the state, where the climate is wetter and the terrain steeper.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#faq-3","section":"causes","topic":"Hillside slope creep"},{"question":"How far should a house be from a slope?","answer":"Codes based on the International Residential Code set footings back from the top of a descending slope by one-third of the slope height, up to 40 feet, and keep buildings back from the toe of an ascending slope by half its height, up to 15 feet.","url":"https://terrabrain.vercel.app/causes/slope-creep-and-lateral-movement#faq-4","section":"causes","topic":"Hillside slope creep"},{"question":"Why do Oklahoma basement walls crack and bow?","answer":"Most trouble comes from sideways pressure: clay that swells when wet and water that builds up in the backfill behind the wall.","url":"https://terrabrain.vercel.app/foundations/basements","section":"foundations"},{"question":"Why are basements less common in Oklahoma?","answer":"A University of Oklahoma geology professor interviewed by NPR described how Oklahoma's red clay expands and contracts with soil moisture, cracking basement walls so they leak.","url":"https://terrabrain.vercel.app/foundations/basements#why-are-basements-less-common-in-oklahoma","section":"foundations","topic":"Oklahoma basements"},{"question":"Oklahoma basements: What types of basement walls are there?","answer":"Foundation walls can be built from concrete, masonry, wood or insulated concrete forms. The types most often seen are:","url":"https://terrabrain.vercel.app/foundations/basements#what-types-of-basement-walls-are-there","section":"foundations","topic":"Oklahoma basements"},{"question":"Oklahoma basements: What does the code require for water?","answer":"Footing drains (IRC R405): required around concrete or masonry walls that retain earth and enclose habitable or usable space below grade, placed at or below the top of the footing and discharged by gravity or a pump; Gravel and pipe: a gravel drain extends at least 1 ft beyond the footing and 6 in above its top; perforated pipe sits on at least 2 in of washed gravel with 6 in of cover; Exception: drains are not required on well-drained Group I sand and gravel soils; clay soils are not part of that group.","url":"https://terrabrain.vercel.app/foundations/basements#what-does-the-code-require-for-water","section":"foundations","topic":"Oklahoma basements"},{"question":"Oklahoma basements: What are the signs of basement trouble?","answer":"Water at the joint between wall and floor slab, or seepage through cracks; the NPR report notes that cracked basement walls leak; White crystalline residue (efflorescence), which forms when water moves through masonry, dissolves salts and evaporates at the surface; Cracked basement floors, a common sign of swelling soil.","url":"https://terrabrain.vercel.app/foundations/basements#what-are-the-signs-of-basement-trouble","section":"foundations","topic":"Oklahoma basements"},{"question":"Oklahoma basements: How are basement walls repaired?","answer":"Wall movement is handled under basement wall repair; water is handled under drainage solutions. Perched water behind walls in wet seasons is explained in groundwater and perched water, and the mechanism is described in lateral earth, swell and hydrostatic pressure on walls.","url":"https://terrabrain.vercel.app/foundations/basements#how-are-basement-walls-repaired","section":"foundations","topic":"Oklahoma basements"},{"question":"Why are basements uncommon in Oklahoma?","answer":"Oklahoma's red clay expands and contracts with moisture, which can crack basement walls and let them leak. Southern building codes also do not require deep frost footings, so a basement means extra excavation instead of using a hole that has to be dug anyway.","url":"https://terrabrain.vercel.app/foundations/basements#faq-1","section":"foundations","topic":"Oklahoma basements"},{"question":"Oklahoma basements: What pushes a basement wall inward?","answer":"The soil behind the wall presses sideways, and the code assigns clay soils the highest design pressure of the common soil groups. Swelling clay and water pressure from saturated backfill add to that load.","url":"https://terrabrain.vercel.app/foundations/basements#faq-2","section":"foundations","topic":"Oklahoma basements"},{"question":"Oklahoma basements: Does my basement need waterproofing or just dampproofing?","answer":"The residential code calls for dampproofing on below-grade walls in most cases and requires waterproofing where a high water table or other severe soil-water conditions are known to exist.","url":"https://terrabrain.vercel.app/foundations/basements#faq-3","section":"foundations","topic":"Oklahoma basements"},{"question":"Oklahoma basements: What does white powder on a basement wall mean?","answer":"White crystalline residue is efflorescence: salts left behind when water moves through concrete or masonry and evaporates. It shows that moisture is getting through the wall.","url":"https://terrabrain.vercel.app/foundations/basements#faq-4","section":"foundations","topic":"Oklahoma basements"},{"question":"Why do Oklahoma foundations move, in plain English?","answer":"Most Oklahoma foundation movement comes from clay that swells when wet and shrinks when dry. Repair aims to stop damaging movement, not reach a level floor.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations","section":"guides"},{"question":"Foundations in plain English: Why does clay move like a sponge?","answer":"Picture the clay under a house as a stack of microscopic sheets. In the most active clays, water slips into the spaces between those sheets, and the soil swells; when it dries, it shrinks.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#why-does-clay-move-like-a-sponge","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: Why is the house moving now?","answer":"Dry spells pull water out of the soil. Summer heat and drought dry the ground under homes, and one foundation repair contractor reported more calls during summer drought.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#why-is-the-house-moving-now","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: Why is \"level\" not the goal?","answer":"No foundation is built perfectly level, and patios, porches and garages are often sloped on purpose for drainage. Engineers look at overall tilt (an even slope across the house) and deflection (bowing between two points), plus cracks and other damage, rather than a single number.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#why-is-level-not-the-goal","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: What is a floor-level map?","answer":"An elevation survey measures the floor height at many points and draws lines connecting equal heights, like a topographic map.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#what-is-a-floor-level-map","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: What is heave?","answer":"Not every problem is sinking. When water collects under a slab, the clay there swells and pushes that area up; this is heave.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#what-is-heave","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: Why are piers paired with water control?","answer":"Piers carry the house down to firmer ground. Water control, including gutters, grading, drainage and moisture barriers, addresses the soil movement that caused the problem in the first place; engineers list both structural and non-structural repairs as options.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#why-are-piers-paired-with-water-control","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: How deep will the piers go?","answer":"In the Tulsa area, steel push piers usually stop around 12 feet; on one large logged job, half of the piers stopped between 9 and 14 feet, and the full range ran from 2 to 40 feet.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#how-deep-will-the-piers-go","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: What happens after the repair?","answer":"Lifting can disturb plumbing, so forensic engineers recommend plumbing tests after any lift and a new elevation survey as a baseline. See lifting procedure and restoration.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#what-happens-after-the-repair","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: Why does my house move with the weather?","answer":"Much of Oklahoma's soil contains clay minerals that soak up water between microscopic layers and swell, then shrink as they dry, so the ground under a house rises and falls with wet and dry periods.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#faq-1","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: Why do foundation problems show up during drought?","answer":"Summer heat and drought dry out the soil under homes, which can make foundations shift; reported signs include new cracks, sticking doors and a gap between the soil and the house.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#faq-2","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: My house is not level. Does that mean the foundation failed?","answer":"Not necessarily. Foundations are not built perfectly level, so engineers judge them by the pattern of tilt, deflection and damage rather than by a single high-to-low number.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#faq-3","section":"guides","topic":"Foundations in plain English"},{"question":"Foundations in plain English: How deep do foundation piers go around Tulsa?","answer":"Oklahoma installation records show Tulsa-area steel push piers stopping at a median of about 12 feet, with half between 9 and 14 feet, though some go much deeper.","url":"https://terrabrain.vercel.app/guides/homeowner-explanations#faq-4","section":"guides","topic":"Foundations in plain English"},{"question":"Why do Oklahoma houses settle on floodplains and soft wet clay?","answer":"Soft river alluvium and wet clay compress under a house as water squeezes out, causing gradual, largely permanent settlement, most under heavy walls.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays","section":"causes"},{"question":"How does soil consolidation work?","answer":"Clay and silt have tiny pores filled with water. When a load is added, the soil can only compress as that water drains out, so the process is slow. The U.S.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#how-does-soil-consolidation-work","section":"causes","topic":"Soft soil settlement"},{"question":"Where do soft soils occur in Oklahoma?","answer":"See Quaternary alluvium and terraces.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#where-do-soft-soils-occur-in-oklahoma","section":"causes","topic":"Soft soil settlement"},{"question":"Soft soil settlement: How does flood exposure affect these sites?","answer":"FEMA's Flood Map Service Center is the official public source for flood hazard maps and can be searched by address. In Oklahoma, the Oklahoma Water Resources Board is the state coordinating agency for the National Flood Insurance Program. See creeks and flood history.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#how-does-flood-exposure-affect-these-sites","section":"causes","topic":"Soft soil settlement"},{"question":"What does soft soil settlement look like?","answer":"Field notes associate soft-soil settlement with sloping floors, stair-step brick cracks wider at the top, sticking doors and, under heavy masonry, a chimney separating or leaning.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#what-does-soft-soil-settlement-look-like","section":"causes","topic":"Soft soil settlement"},{"question":"How is soft soil settlement repaired?","answer":"Repairs for this mechanism transfer the load through the soft layer to firmer soil or rock below. Options include steel push piers and helical piers.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#how-is-soft-soil-settlement-repaired","section":"causes","topic":"Soft soil settlement"},{"question":"What is soil consolidation?","answer":"Consolidation is the slow compression of fine-grained soil, such as clay or silt, as the weight on it squeezes water out of its pores. The settlement it causes is largely permanent because the collapsed pore space does not recover.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#faq-1","section":"causes","topic":"Soft soil settlement"},{"question":"Are floodplain soils in Oklahoma soft?","answer":"Some are. The Osage soil series, mapped on eastern Oklahoma floodplains, is a thick clayey alluvium that is poorly drained, with a seasonal high water table 6 to 18 inches deep from November through May in normal years.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#faq-2","section":"causes","topic":"Soft soil settlement"},{"question":"Soft soil settlement: How is consolidation measured?","answer":"Engineers use a laboratory consolidation test (ASTM D2435), which loads a confined, saturated soil sample in steps and measures how much and how fast it compresses.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#faq-3","section":"causes","topic":"Soft soil settlement"},{"question":"Soft soil settlement: How do I find out if my house is in a floodplain?","answer":"FEMA's Flood Map Service Center is the official public source for flood hazard maps and can be searched by address.","url":"https://terrabrain.vercel.app/causes/soft-soil-consolidation-alluvium-and-wet-clays#faq-4","section":"causes","topic":"Soft soil settlement"},{"question":"Why do the edges of a house sink in dry Oklahoma weather?","answer":"Expansive clay around the outside of a house dries and shrinks while soil under the middle stays moist, so the edges sink. It is worst in drought.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop","section":"causes"},{"question":"How does edge drop happen?","answer":"Expansive clay shrinks as it loses moisture and swells as it gains it. Engineers describe seasonal moisture loss letting the perimeter of a slab settle, and seasonal moisture gain pushing it back up.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#how-does-edge-drop-happen","section":"causes","topic":"Edge drop in dry weather"},{"question":"Edge drop in dry weather: How deep does the drying go?","answer":"The zone of soil whose moisture changes with the weather is called the active zone. - In Oklahoma, it has been estimated at roughly 0.5 to 4 meters (about 1.5 to 13 feet), depending on soil properties and climate. - A PreventionWeb hazard profile puts the zone of seasonal moisture change usually in the upper 1.5 to 2 meters, reaching about 5 meters in some cases. - Engineering literature reports seasonal fluctuation from about 3 to 40 feet deep in expansive soils, with cracks reaching deeper than often assumed and multi-year droughts drying soil deeper than previously believed.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#how-deep-does-the-drying-go","section":"causes","topic":"Edge drop in dry weather"},{"question":"Why do Oklahoma soils and climate cause edge drop?","answer":"Nearly all of Oklahoma has medium or high soil swelling potential, based on USDA soil survey data.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#why-do-oklahoma-soils-and-climate-cause-edge-drop","section":"causes","topic":"Edge drop in dry weather"},{"question":"How do trees and drought affect edge drop?","answer":"Below the depth reached by surface drying, the water demand of vegetation, particularly trees on clay soils, drives the moisture changes that cause shrinking and swelling.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#how-do-trees-and-drought-affect-edge-drop","section":"causes","topic":"Edge drop in dry weather"},{"question":"What are the signs of edge drop?","answer":"stair-step brick cracks wider at the top; soil pulled away from the foundation; cracks that open and close seasonally.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#what-are-the-signs-of-edge-drop","section":"causes","topic":"Edge drop in dry weather"},{"question":"How is edge drop different from center heave?","answer":"Both can leave a floor high in the middle. In edge drop, the edges went down; in center heave, the center came up. Engineers associate center lift with long-term moisture gain, typically in older foundations, and edge movement with seasonal moisture changes.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#how-is-edge-drop-different-from-center-heave","section":"causes","topic":"Edge drop in dry weather"},{"question":"How is edge drop typically fixed?","answer":"Underpinning below the active zone. A standard risk-reduction measure for shrink-swell ground is extending foundations below the zone of moisture fluctuation, adjusted for vegetation.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#how-is-edge-drop-typically-fixed","section":"causes","topic":"Edge drop in dry weather"},{"question":"Edge drop in dry weather: Why does my house have more cracks in late summer?","answer":"Expansive clay around the perimeter loses moisture in hot, dry weather and shrinks, so the edges of the foundation lose support and drop. Seasonal moisture loss lets the perimeter settle, and seasonal moisture gain can push it back up, so cracks often open in dry periods and partly close after rain.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#faq-1","section":"causes","topic":"Edge drop in dry weather"},{"question":"Edge drop in dry weather: Do trees cause foundation settlement?","answer":"Trees and large shrubs near a house can dry the soil beneath the foundation, especially during drought, causing the soil to shrink and the foundation to settle. Removing established trees can also cause foundation movement.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#faq-2","section":"causes","topic":"Edge drop in dry weather"},{"question":"Edge drop in dry weather: How deep does soil drying reach under an Oklahoma house?","answer":"Oklahoma State University research estimated the active zone, the depth of soil whose moisture changes with the climate, at roughly 0.5 to 4 meters depending on soil and climate. Multi-year droughts can dry soil deeper than normal.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#faq-3","section":"causes","topic":"Edge drop in dry weather"},{"question":"Edge drop in dry weather: How deep do foundation repair piers go in Oklahoma?","answer":"In Oklahoma steel push pier installation records, typical pier depths ranged from about 8 to 16 feet, with a median of about 12 feet in Tulsa. The goal is to bear below the soil that shrinks and swells.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#faq-4","section":"causes","topic":"Edge drop in dry weather"},{"question":"Is a house that is high in the middle always settling at the edges?","answer":"No. A dome-shaped floor can also come from the center rising because of moisture build-up or a leak. Comparing elevations with reference points and repeated surveys shows which part actually moved.","url":"https://terrabrain.vercel.app/causes/perimeter-drying-settlement-edge-drop#faq-5","section":"causes","topic":"Edge drop in dry weather"},{"question":"Why does a chimney or column settle more than the rest of the house?","answer":"A heavy chimney, column or added story can press on the soil harder than it can support, so that spot sinks. It is a soil-strength problem, not a seasonal one.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement","section":"causes"},{"question":"What is concentrated load settlement?","answer":"Engineers describe three common kinds of foundation movement: heave (expansive clay swelling as it takes on water), subsidence (soil shrinking as moisture is withdrawn) and settlement, which is soil compressing because it is loaded beyond its bearing capacity.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#what-is-concentrated-load-settlement","section":"causes","topic":"Heavy-spot settlement"},{"question":"Which parts of a house are heavy spots?","answer":"Examples of concentrated loads in a home include: - masonry chimneys and fireplaces - interior columns and posts that carry beams - second stories added after the original construction - heavy fixtures or masonry features resting on a slab","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#which-parts-of-a-house-are-heavy-spots","section":"causes","topic":"Heavy-spot settlement"},{"question":"What are the signs of concentrated load settlement?","answer":"The most typical sign is a chimney separating or leaning away from the house, with a gap at the wall or roofline. Floors near a heavy column or wall may also slope toward it, showing up as sloping floors.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#what-are-the-signs-of-concentrated-load-settlement","section":"causes","topic":"Heavy-spot settlement"},{"question":"Heavy-spot settlement: Which Oklahoma soil conditions make it worse?","answer":"Weak, compressible soils are found in parts of Oklahoma, particularly in river-bottom alluvium (soil laid down by streams).","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#which-oklahoma-soil-conditions-make-it-worse","section":"causes","topic":"Heavy-spot settlement"},{"question":"How is concentrated load settlement evaluated?","answer":"Load and footing. An inspection identifies what the heavy element is and, where possible, how large and deep its footing is; Soil strength.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#how-is-concentrated-load-settlement-evaluated","section":"causes","topic":"Heavy-spot settlement"},{"question":"How is concentrated load settlement typically fixed?","answer":"Underpinning, which means adding piers or piles under an existing foundation, is the usual structural approach for a settled heavy element.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#how-is-concentrated-load-settlement-typically-fixed","section":"causes","topic":"Heavy-spot settlement"},{"question":"What is concentrated load settlement?","answer":"It is settlement that happens under one heavy spot of a house, such as a masonry chimney, a column or an added second story, when that load presses on the soil harder than the soil can carry. The heavy area sinks relative to the lighter parts around it.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#faq-1","section":"causes","topic":"Heavy-spot settlement"},{"question":"Heavy-spot settlement: Why does a chimney pull away from a house?","answer":"A masonry chimney is a heavy load concentrated on a small footing. If the soil under that footing compresses more than the soil under the rest of the house, the chimney settles or tilts and a gap opens where it meets the wall.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#faq-2","section":"causes","topic":"Heavy-spot settlement"},{"question":"Heavy-spot settlement: How do engineers check whether soil can carry a load?","answer":"Common tests include the standard penetration test in a boring and laboratory unconfined compression and consolidation tests on undisturbed samples. Oklahoma transportation research has used these tests to characterize weak clayey and silty soils.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#faq-3","section":"causes","topic":"Heavy-spot settlement"},{"question":"Heavy-spot settlement: Does underpinning one area fix the whole house?","answer":"No. Texas engineering guidelines note that underpinning does not improve the areas of a foundation that are not underpinned, so pier locations, sizes and depths have to be specified for the problem area.","url":"https://terrabrain.vercel.app/causes/concentrated-load-settlement#faq-4","section":"causes","topic":"Heavy-spot settlement"},{"question":"Why does a home addition crack away from the original house?","answer":"An addition is often a separate foundation at a different depth on different soil prep, so on Oklahoma clay the two move differently and crack at the joint.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations","section":"guides"},{"question":"Addition cracking at joint: Why do the two parts move differently?","answer":"Different foundation types. A slab addition attached to a crawl-space house, or a new slab poured beside an old one, rests on the soil in different ways; Different depths.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#why-do-the-two-parts-move-differently","section":"guides","topic":"Addition cracking at joint"},{"question":"Addition cracking at joint: What are the signs at the junction?","answer":"A crack running along the line where old and new meet; A step or separation in the roofline or siding at the joint; A floor height change or door misalignment at the doorway between old and new rooms.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#what-are-the-signs-at-the-junction","section":"guides","topic":"Addition cracking at joint"},{"question":"How are additions and mixed foundations repaired?","answer":"Supporting a shallow addition often means piers along the addition's perimeter down to firmer soil. See steel push piers and helical piers.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#how-are-additions-and-mixed-foundations-repaired","section":"guides","topic":"Addition cracking at joint"},{"question":"Addition cracking at joint: What about permits and disclosure?","answer":"Cities control permits for additions and repairs. In Tulsa, construction plans are required when damage is extensive or structural, as decided by the plans examiner.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#what-about-permits-and-disclosure","section":"guides","topic":"Addition cracking at joint"},{"question":"Why is there a crack where my addition meets the house?","answer":"The addition and the original house often sit on different foundation types, depths and soils and were built decades apart under different codes, so they can move by different amounts as the clay underneath wets and dries.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#faq-1","section":"guides","topic":"Addition cracking at joint"},{"question":"Were older additions built to the same code as new ones?","answer":"Not necessarily. Oklahoma's current residential code requires two #4 reinforcing bars in all footings, a requirement added as an Oklahoma amendment, so footings built before these rules may have less reinforcing.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#faq-2","section":"guides","topic":"Addition cracking at joint"},{"question":"Do I need a permit to build or repair an addition?","answer":"Cities set permit rules. Tulsa, for example, accepts permit applications from owners, contractors, architects or agents and requires construction plans when damage is extensive or structural.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#faq-3","section":"guides","topic":"Addition cracking at joint"},{"question":"Should an addition be tied to the house or allowed to move separately?","answer":"Both approaches are used. One connects the two parts rigidly with support on both sides; the other gives the addition its own support and a flexible joint so each part can move without damaging the other.","url":"https://terrabrain.vercel.app/guides/additions-and-mixed-foundations#faq-4","section":"guides","topic":"Addition cracking at joint"},{"question":"Why does dry silty soil in Oklahoma sink when it gets wet?","answer":"Loose, dry silts hold together only while dry; when water first reaches them under a house, the bonds weaken and the soil compacts, causing sudden settlement.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil","section":"causes"},{"question":"What is collapsible soil?","answer":"Collapsible soils are geologically recent, loosely packed sediments that can settle or collapse suddenly. In their dry state the grains are held apart by small amounts of clay, silt and suction (the pull of thin water films between grains), and water weakens those bonds.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#what-is-collapsible-soil","section":"causes","topic":"Collapsible soil"},{"question":"How does collapsible soil damage a house?","answer":"A house is built on loose, dry silt that is strong enough while dry; Water is added, usually from a human source; The bonds weaken, the soil compacts under the load, and the area over the wetted zone drops.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#how-does-collapsible-soil-damage-a-house","section":"causes","topic":"Collapsible soil"},{"question":"Where does collapsible soil occur in Oklahoma?","answer":"The Oklahoma Panhandle has tableland plains covered by loess, a wind-deposited silt. The Richfield soil series, mapped in the Panhandle, formed in calcareous loess 1 to more than 3 meters thick, with silt loam at the surface.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#where-does-collapsible-soil-occur-in-oklahoma","section":"causes","topic":"Collapsible soil"},{"question":"What are the signs of soil collapse?","answer":"stair-step brick cracks wider at the top over the wetted area; sloping floors; visible slab cracks.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#what-are-the-signs-of-soil-collapse","section":"causes","topic":"Collapsible soil"},{"question":"Collapsible soil: How is collapse different from leak heave?","answer":"Water under a slab can make the floor go either up or down depending on the soil. On expansive clay, added water causes swelling and a hump; on collapsible silt, it causes the soil to compact and drop. See leak-induced localized heave for the clay version.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#how-is-collapse-different-from-leak-heave","section":"causes","topic":"Collapsible soil"},{"question":"How is collapsible soil typically addressed?","answer":"Stop the water. The EPA's whole-house meter test (read the meter, use no water for two hours, read it again) checks for supply leaks, and Texas engineering guidelines call for testing supply and drain lines whenever a foundation is lifted; Monitor.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#how-is-collapsible-soil-typically-addressed","section":"causes","topic":"Collapsible soil"},{"question":"Collapsible soil: What is hydrocollapse?","answer":"Hydrocollapse, also called hydrocompaction, is sudden settlement of loose, dry soil when it gets wet. Water weakens the clay, silt and suction bonds holding the grains apart, and the grains shift into a denser arrangement, so the ground drops.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#faq-1","section":"causes","topic":"Collapsible soil"},{"question":"How much can collapsible soil settle?","answer":"The Colorado Geological Survey reports volume reductions of 10 to 15 percent in collapsible soils and documented settlements of more than six feet.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#faq-2","section":"causes","topic":"Collapsible soil"},{"question":"Where are collapsible soils found in Oklahoma?","answer":"Wind-deposited silt called loess covers tableland plains in the Oklahoma Panhandle; the Richfield soil series, for example, formed in calcareous loess 1 to more than 3 meters thick. Compacted fills elsewhere in the state can also settle when wetted.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#faq-3","section":"causes","topic":"Collapsible soil"},{"question":"Collapsible soil: What usually triggers collapse under a house?","answer":"Most collapse is attributed to human activity that raises soil moisture, such as lawn and shrub watering, leaking water lines in utility trenches, ponded water and blocked drainage.","url":"https://terrabrain.vercel.app/causes/hydrocollapse-collapsible-soil#faq-4","section":"causes","topic":"Collapsible soil"},{"question":"Why does fill soil under a house cause settlement?","answer":"Poorly compacted fill, or fill with organic material or debris, can keep settling for years, often on one side of the house, apart from the seasonal pattern.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history","section":"guides"},{"question":"What is fill and why does it settle?","answer":"Fill is any soil, rock or debris placed by people rather than left in place by nature. On a sloping lot, builders often cut into the uphill side and push that soil to the downhill side to make a flat pad, a \"cut-and-fill\" lot.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#what-is-fill-and-why-does-it-settle","section":"guides","topic":"Fill soil and lot history"},{"question":"What are the red flags for a filled lot?","answer":"These patterns are compared with seasonal clay movement on heave vs settlement, and the mechanism is described on fill consolidation settlement.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#what-are-the-red-flags-for-a-filled-lot","section":"guides","topic":"Fill soil and lot history"},{"question":"How is fill investigated?","answer":"Borings and lab samples are the direct way to see what is under a house.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#how-is-fill-investigated","section":"guides","topic":"Fill soil and lot history"},{"question":"What does fill mean for repair?","answer":"Piers have to pass through fill to reach native soil or rock that can carry the load; see steel push piers and helical piers; Settling fill can drag down on the sides of a pier, an added load engineers call downdrag; Interior slab areas over fill may continue to settle after the perimeter is supported; options include slabjacking and polyurethane and interior piers.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#what-does-fill-mean-for-repair","section":"guides","topic":"Fill soil and lot history"},{"question":"What is fill soil?","answer":"Fill is soil or other material brought in or moved during construction to level a lot or raise a building pad. How well it was chosen and compacted largely decides how it behaves under a house.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#faq-1","section":"guides","topic":"Fill soil and lot history"},{"question":"Why does a house on fill settle?","answer":"Fill that was not compacted in thin layers can squeeze down under the weight of the house and when it gets wet. The USGS lists hydrocompaction and drainage of organic soils among the causes of land subsidence.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#faq-2","section":"guides","topic":"Fill soil and lot history"},{"question":"Can clay be used as fill?","answer":"It often is, but highly expansive clay makes poor fill. An Oklahoma State University study rated Kirkland soil very poor as road fill because of its unstable, high shrink-swell material.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#faq-3","section":"guides","topic":"Fill soil and lot history"},{"question":"How is fill identified under a house?","answer":"Borings or hand-auger samples show what is below the slab. Debris such as brick, concrete, wood or trash in samples, or loose layers over native soil, indicates fill.","url":"https://terrabrain.vercel.app/guides/fill-soils-and-lot-history#faq-4","section":"guides","topic":"Fill soil and lot history"},{"question":"Why does my ceiling crack in winter and close in summer?","answer":"Often truss uplift: roof trusses bow up in cold weather and lift the ceiling off interior walls. It mimics heave, but the floor has not moved.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic","section":"causes"},{"question":"What is a roof truss?","answer":"Roof trusses are factory-built triangles of lumber. The sloped top members (top chords) carry the roof, and the flat bottom member (bottom chord) doubles as the ceiling joist that the ceiling drywall is fastened to. The ends of each truss bear on the exterior walls.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#what-is-a-roof-truss","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"How does truss uplift happen?","answer":"The two chords live in different conditions. The bottom chord is buried in ceiling insulation, where it stays warmer and drier, while the top chords are exposed to the ventilated attic air. Wood changes size with moisture, so the two parts of the truss move by different amounts.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#how-does-truss-uplift-happen","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"Where does truss uplift show up?","answer":"Cracks along the ceiling-to-wall corner over interior, non-load-bearing partitions, especially walls running across the trusses; Tape torn through at the ceiling corner, rather than a crack along the edge of the tape, which may point to poor taping instead; Popping or snapping noises from the ceiling.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#where-does-truss-uplift-show-up","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"How can truss uplift be told from foundation heave?","answer":"Inspecting the attic framing above the crack is part of diagnosis. A floor elevation survey separates the two: truss uplift is in the roof, so the floor stays put. See ceiling-wall separation at interior walls and heave vs settlement.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#how-can-truss-uplift-be-told-from-foundation-heave","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"How is truss uplift usually handled?","answer":"Because the truss is moving rather than failing, trade literature describes uplift as a cosmetic problem, not a structural one. Common approaches:","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#how-is-truss-uplift-usually-handled","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"What is truss uplift?","answer":"Truss uplift is the seasonal upward bowing of roof trusses caused by different moisture and temperature conditions in the top and bottom members of the truss. Because the ceiling is fastened to the truss, it lifts away from interior walls.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#faq-1","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"When does truss uplift happen?","answer":"The ceiling-to-wall cracks typically open in winter and close again in summer, when the top and bottom of the truss return to similar temperature and moisture.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#faq-2","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"Is truss uplift a structural problem?","answer":"Building trade literature describes it as cosmetic rather than structural. The truss is moving with seasonal moisture, not failing.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#faq-3","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"How is truss uplift different from foundation heave?","answer":"Truss uplift happens in the roof framing, so the floor does not move. Foundation heave raises the floor and walls, which shows up on a floor elevation survey and in other signs such as sticking doors.","url":"https://terrabrain.vercel.app/causes/truss-uplift-mimic#faq-4","section":"causes","topic":"Truss uplift ceiling cracks"},{"question":"Why does my floor sag between piers in a crawl space?","answer":"It is usually a framing and support problem: interior piers that settled or tilted, spans too long for the load, or wood damaged by moisture.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports","section":"signs"},{"question":"What does a sagging floor look like?","answer":"The floor feels soft or low in the middle of a room or along a hallway, then firms up near walls or over a beam. Furniture may rock, and a level laid across the floor shows a dip rather than a steady slope in one direction.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#what-does-a-sagging-floor-look-like","section":"signs","topic":"Sagging floor between supports"},{"question":"Why do floors sag between supports?","answer":"Interior piers that settle or rotate drop or lean, which reduces their bearing capacity, and a wood frame tends to flex or sag to follow them.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#why-do-floors-sag-between-supports","section":"signs","topic":"Sagging floor between supports"},{"question":"How is a sagging floor documented?","answer":"Floor survey. An elevation survey shows whether the low areas sit between supports (a framing pattern) or along one side of the house (a perimeter foundation pattern). See elevation surveys; Crawl space inspection.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#how-is-a-sagging-floor-documented","section":"signs","topic":"Sagging floor between supports"},{"question":"How is a sagging floor repaired?","answer":"Engineering guidance for crawl space floors lists:","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#how-is-a-sagging-floor-repaired","section":"signs","topic":"Sagging floor between supports"},{"question":"Why does my floor dip between the piers under the house?","answer":"Common causes are interior piers that have settled or tilted, beams or joists spanning too far for their load, and wood weakened by moisture and decay. The wood frame flexes or sags to follow the supports that have dropped.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#faq-1","section":"signs","topic":"Sagging floor between supports"},{"question":"What deflection is considered too much for a floor?","answer":"The building code limit for live-load deflection of floor members is L/360, meaning the span length divided by 360. Engineering guidance also uses that ratio as a benchmark when judging foundation deflection.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#faq-2","section":"signs","topic":"Sagging floor between supports"},{"question":"Are shims a normal way to level a pier-and-beam floor?","answer":"Engineering guidance lists adding hardwood or steel shims on top of pier caps as a way to adjust floor framing, along with replacing or reinforcing damaged members and adding supports where spans are too long.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#faq-3","section":"signs","topic":"Sagging floor between supports"},{"question":"Does crawl space moisture affect sagging floors?","answer":"It can. Unmanaged crawl space moisture can damage wood flooring and framing, and rotting wood members are cited as a structural concern. Controls include ground vapor barriers, cross ventilation, drainage and ground clearance for wood.","url":"https://terrabrain.vercel.app/signs/sagging-floor-between-supports#faq-4","section":"signs","topic":"Sagging floor between supports"},{"question":"Why does some Oklahoma clay swell more than others?","answer":"Swelling depends mostly on clay minerals. Montmorillonite, a smectite, takes water between its layers and swells most; kaolinite swells much less.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy","section":"guides"},{"question":"What are clay minerals?","answer":"Clay minerals are microscopic, plate-shaped crystals built from layers of silica and alumina.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#what-are-clay-minerals","section":"guides","topic":"Clay minerals and swelling"},{"question":"Clay minerals and swelling: What have Oklahoma studies found?","answer":"Soils on Permian red beds. In central and western Oklahoma soils formed from Permian shales, the fine clay was dominantly montmorillonite, with a mix of illite and montmorillonite, plus small amounts of kaolinite, in the coarser clay.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#what-have-oklahoma-studies-found","section":"guides","topic":"Clay minerals and swelling"},{"question":"Can soil color show how much a clay will swell?","answer":"High-plasticity clays occur in both red and gray soils. Red Permian soils such as Kirkland are montmorillonite-rich, and a south Tulsa report on a site underlain by Nowata Unit shales found olive, brown and gray fat clay with plasticity indices up to about 39.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#can-soil-color-show-how-much-a-clay-will-swell","section":"guides","topic":"Clay minerals and swelling"},{"question":"Clay minerals and swelling: Which lab tests stand in for mineralogy?","answer":"Mineral analysis is rarely run for a house. Engineers instead use index tests. The residential code treats soil as expansive when it has a plasticity index of 15 or more, more than 10% passing a No.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#which-lab-tests-stand-in-for-mineralogy","section":"guides","topic":"Clay minerals and swelling"},{"question":"Clay minerals and swelling: How does mineralogy relate to chemical treatment?","answer":"Chemical treatments work on the clay itself. Forensic engineers list lime, cement, potassium and other chemicals among soil injection options. Oklahoma pavement research found that stabilizers react with soil particles to form cementing compounds that add strength.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#how-does-mineralogy-relate-to-chemical-treatment","section":"guides","topic":"Clay minerals and swelling"},{"question":"What makes clay soil swell?","answer":"In 2:1 clay minerals such as montmorillonite (smectite), water is absorbed into the spaces between the mineral's layers, which is the main mechanism of shrink and swell; 1:1 clays such as kaolinite swell much less.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#faq-1","section":"guides","topic":"Clay minerals and swelling"},{"question":"Is Oklahoma clay high in montmorillonite?","answer":"Many Oklahoma soils are. An Oklahoma State University study found the fine clay in Permian-derived soils of central and western Oklahoma was dominantly montmorillonite, and the Oklahoma Geological Survey reports that over 75% of the state's bedrock can produce expansive soils.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#faq-2","section":"guides","topic":"Clay minerals and swelling"},{"question":"Clay minerals and swelling: Is the shale under my house as expansive as the soil?","answer":"Not always. A USGS study found Hennessey shale cored near Oklahoma City was mainly illite and kaolinite with low shrink-swell potential, though other studies have reported swelling and mixed-layer clays in the same units elsewhere.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#faq-3","section":"guides","topic":"Clay minerals and swelling"},{"question":"Can lime treatment make clay swell?","answer":"Yes, when the soil is high in sulfate. Oklahoma research found lime added to a high-sulfate soil sharply increased swell because it formed the expansive mineral ettringite.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#faq-4","section":"guides","topic":"Clay minerals and swelling"},{"question":"Can I tell how expansive clay is by its color?","answer":"No. Both red Permian clays in central Oklahoma and gray and brown shale-derived clays in south Tulsa have tested as highly plastic, so lab tests are used instead of color.","url":"https://terrabrain.vercel.app/guides/clay-mineralogy#faq-5","section":"guides","topic":"Clay minerals and swelling"},{"question":"Why does Tulsa's flood history matter for Oklahoma foundations?","answer":"Tulsa's floods, peaking in 1984 on Mingo Creek, led to buyouts and floodplain rules. Creek corridors hold deep, soft deposits and shallow water.","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history","section":"data"},{"question":"What were Tulsa's major floods?","answer":"The City of Tulsa's flooding history lists these events:","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history#what-were-tulsa-s-major-floods","section":"data","topic":"Tulsa creeks and flood history"},{"question":"What about flooding in Oklahoma City?","answer":"Flooding is a statewide hazard; an Oklahoma Geological Survey summary lists floods among Oklahoma's six main natural hazards. Heavy rain also hits central Oklahoma: in May 2015 Oklahoma City received 19.48 inches, its wettest month on record.","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history#what-about-flooding-in-oklahoma-city","section":"data","topic":"Tulsa creeks and flood history"},{"question":"Tulsa creeks and flood history: Why do creek corridors matter for foundations?","answer":"Creeks and rivers lay down alluvium, loose sediment of clay, silt and sand. Along the Arkansas River in Tulsa County, shale lies about 5 to 10 feet below the river bottom but generally 20 to 30 feet below the banks.","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history#why-do-creek-corridors-matter-for-foundations","section":"data","topic":"Tulsa creeks and flood history"},{"question":"What was the worst flood in Tulsa history?","answer":"The Memorial Day flood of 1984, when about 15 inches of rain fell overnight. It killed 14 people, injured 288 and damaged or destroyed nearly 7,000 buildings, mostly along Mingo Creek.","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history#faq-1","section":"data","topic":"Tulsa creeks and flood history"},{"question":"Which Tulsa creeks have flooded most often?","answer":"City records list repeated floods on Mingo, Joe, Haikey, Fry, Bird and Flat Rock creeks, with Mingo Creek flooding at least twice in 1974; for some residents that was a third flood in a year.","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history#faq-2","section":"data","topic":"Tulsa creeks and flood history"},{"question":"When did Tulsa adopt floodplain regulations?","answer":"Tulsa adopted a 100-year flood standard in 1971 and comprehensive floodplain regulations in 1977. A stormwater utility fee was created by ordinance in 1986.","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history#faq-3","section":"data","topic":"Tulsa creeks and flood history"},{"question":"Is the soil different near creeks?","answer":"Often, yes. Along the Arkansas River in Tulsa County, shale is about 5 to 10 feet below the river bottom but generally 20 to 30 feet below the banks, with soil and river deposits filling the space above.","url":"https://terrabrain.vercel.app/data/creeks-and-flood-history#faq-4","section":"data","topic":"Tulsa creeks and flood history"},{"question":"Why does western Oklahoma gypsum cause sinkholes?","answer":"Gypsum beds like the Blaine Formation, and deeper salt, dissolve in groundwater and form caves, sinkholes and voids, a different risk from clay movement.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine","section":"geology"},{"question":"What are the gypsum and salt beds?","answer":"Gypsum is a soft mineral (calcium sulfate) that forms when seawater evaporates. Rocks formed this way, including gypsum, anhydrite and rock salt, are called evaporites. Western Oklahoma has enormous gypsum reserves, mined for wallboard, plaster, cement and soil amendment.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#what-are-the-gypsum-and-salt-beds","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"What is evaporite karst?","answer":"Karst is ground shaped by rock that dissolves in water. The Oklahoma Geological Survey notes that karst occurs in many areas of western Oklahoma where gypsum and shallow salt deposits are common.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#what-is-evaporite-karst","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"What soils lie above gypsum country?","answer":"Woodward soils formed in residuum from soft, calcareous Permian sandstone or siltstone over a large area of western Oklahoma, with soft rock at 20 to 40 inches.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#what-soils-lie-above-gypsum-country","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"What does gypsum karst mean for foundations?","answer":"Distinguish slow seasonal cracking from a sudden local drop.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#what-does-gypsum-karst-mean-for-foundations","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"Gypsum karst and sinkholes: What is the Blaine Formation?","answer":"It is a Permian rock unit in western Oklahoma made mostly of gypsum, about 60 meters thick in the Mangum area, with thin dolomite and shale beds between the gypsum layers.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#faq-1","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"Why does gypsum cause sinkholes?","answer":"Gypsum is soluble, so groundwater moving through gypsum beds can open cavities, caves and disappearing streams. The Oklahoma Geological Survey describes the resulting sinkholes and caverns as potential hazards, with possible settlement or collapse of the land surface.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#faq-2","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"Gypsum karst and sinkholes: Is there salt under western Oklahoma too?","answer":"Yes. Thick rock salt underlies much of western Oklahoma at depths from about 30 feet to 3,000 feet, and salt-rich springs feed salt plains in the region.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#faq-3","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"Has gypsum karst affected large projects in Oklahoma?","answer":"Yes. A proposed dam site near Mangum on the Blaine gypsum was recommended for abandonment after borings found abundant open and clay-filled cavities and large water losses during pressure tests.","url":"https://terrabrain.vercel.app/geology/permian-gypsum-units-e-g-blaine#faq-4","section":"geology","topic":"Gypsum karst and sinkholes"},{"question":"Why is brick pulling away from my window or door frame?","answer":"Usually the foundation edge carrying the brick has dropped, often as perimeter clay dries and shrinks. The gap tends to be widest in late summer and drought.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame","section":"signs"},{"question":"Brick gap at window or door: Why does the gap open?","answer":"Brick veneer is a single layer of brick tied to the wood-framed wall behind it and resting on a ledge at the edge of the foundation. Windows and doors are attached to the wood framing.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#why-does-the-gap-open","section":"signs","topic":"Brick gap at window or door"},{"question":"Brick gap at window or door: How do Oklahoma soils cause it?","answer":"More than 75% of Oklahoma has bedrock that can produce expansive soils, and clay-rich shales can swell to 1.5 to 2 times their dry volume when wet.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#how-do-oklahoma-soils-cause-it","section":"signs","topic":"Brick gap at window or door"},{"question":"Brick gap at window or door: What else should you look for?","answer":"Separation at frames rarely appears alone. Check the same wall for:","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#what-else-should-you-look-for","section":"signs","topic":"Brick gap at window or door"},{"question":"Brick gap at window or door: How do you document it?","answer":"Measure gap width at the same points on each frame, top and sides; Photograph each gap with a ruler or crack gauge in view; Repeat every month or two through at least one summer and winter.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#how-do-you-document-it","section":"signs","topic":"Brick gap at window or door"},{"question":"Brick gap at window or door: What are the next steps?","answer":"Plot the sign on an elevation survey, compare it with the patterns in the distress pattern library, and use the symptom matrix to weigh likely mechanisms.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#what-are-the-next-steps","section":"signs","topic":"Brick gap at window or door"},{"question":"Why is my brick pulling away from the window frame?","answer":"A common cause is the outer edge of the foundation dropping as clay soil under it dries and shrinks. The brick moves with the foundation while the window frame, attached to the wood wall, does not move the same way, so a gap opens.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#faq-1","section":"signs","topic":"Brick gap at window or door"},{"question":"Brick gap at window or door: How much movement does it take to see cracks?","answer":"Horticultural guidance on trees and clay soils notes that cracks usually need about 5 to 10 millimeters of movement before they appear, often around windows and doors.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#faq-2","section":"signs","topic":"Brick gap at window or door"},{"question":"Brick gap at window or door: Does the gap change with the seasons?","answer":"It can. Monitoring of slabs on expansive clay in Texas found settlement growing through summer and drought and partly recovering in winter, so gaps tied to soil drying often widen in late summer.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#faq-3","section":"signs","topic":"Brick gap at window or door"},{"question":"Brick gap at window or door: How should I measure the gap?","answer":"Measure the gap width at the same spots with a ruler or crack gauge, photograph it with a scale, and repeat every month or two so the trend through the seasons is clear.","url":"https://terrabrain.vercel.app/signs/brick-separating-from-window-or-door-frame#faq-4","section":"signs","topic":"Brick gap at window or door"},{"question":"Why is my chimney pulling away from the house or leaning?","answer":"Its heavy footing at the edge of the house can settle, or the soil under it can be soft or drying. Earthquake shaking is another possible cause in Oklahoma.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning","section":"signs"},{"question":"Why do chimneys move differently from the house?","answer":"Most of a house is light wood framing spread along long foundation beams. A brick or stone chimney concentrates a great deal of weight on a small footing. That difference means the chimney can settle or tilt on its own even when the rest of the foundation is moving only a little.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning#why-do-chimneys-move-differently-from-the-house","section":"signs","topic":"Chimney separating or leaning"},{"question":"Chimney separating or leaning: How should it be documented?","answer":"Measure how far the chimney is out of plumb over a known height with a level or plumb line; Measure the gap between chimney and wall at the bottom, middle and top; Photograph cracks in the chimney with a scale, and note whether crack edges are clean or weathered.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning#how-should-it-be-documented","section":"signs","topic":"Chimney separating or leaning"},{"question":"Chimney separating or leaning: What are the next steps?","answer":"Compare the pattern with the distress pattern library and the symptom matrix. For a chimney that continues to move, see working with engineers.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning#what-are-the-next-steps","section":"signs","topic":"Chimney separating or leaning"},{"question":"Why is my chimney pulling away from the house?","answer":"An exterior masonry chimney is heavy and usually sits on its own footing. If that footing settles more than the house foundation, or the soil under it is soft or drying, the chimney tilts and a gap opens at the wall or roofline.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning#faq-1","section":"signs","topic":"Chimney separating or leaning"},{"question":"Can earthquakes damage chimneys in Oklahoma?","answer":"Earthquake shaking is one of the possible causes tracked for this sign. Oklahoma has had several moderate earthquakes, including the magnitude 5.7 Prague event in 2011 and the magnitude 5.8 Pawnee event in 2016, and a chimney that cracked right after a felt quake points toward shaking.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning#faq-2","section":"signs","topic":"Chimney separating or leaning"},{"question":"How do I measure a leaning chimney?","answer":"Hold a level or plumb line against the chimney face and measure how far it is out of plumb over a known height, and measure the gap at the wall at the top and bottom. Repeat the measurements over time to see if it is moving.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning#faq-3","section":"signs","topic":"Chimney separating or leaning"},{"question":"Do home inspectors check chimneys?","answer":"Home inspection standards include inspecting the chimney from ground level or the eaves, and reporting signs of possible foundation movement such as brick cracks.","url":"https://terrabrain.vercel.app/signs/chimney-separating-or-leaning#faq-4","section":"signs","topic":"Chimney separating or leaning"},{"question":"Why is my driveway or patio lifting, sinking or cracking?","answer":"Thin slabs on Oklahoma clay lift when soil swells and sink when it washes out, compresses or dries. This alone does not mean the house foundation moved.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork","section":"signs"},{"question":"Why does flatwork move so easily?","answer":"\"Flatwork\" means exterior concrete slabs: driveways, walks, patios, porches and pool decks. They are usually a few inches thick, carry little weight and sit on the top layer of soil, the layer whose moisture changes most.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#why-does-flatwork-move-so-easily","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"Does flatwork movement mean the house moved?","answer":"Engineering guidance on expansive soil recommends keeping soil moisture steady around a building and mentions surrounding it with concrete paving as one way to limit moisture changes.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#does-flatwork-movement-mean-the-house-moved","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"How do you document flatwork movement?","answer":"Note which way each slab has moved: lifted, sunk or tilted, and toward or away from the house; Measure height differences at joints and cracks with a ruler or level; Photograph with a ruler in view, and record the season and recent weather.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#how-do-you-document-flatwork-movement","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"How is flatwork repaired?","answer":"Options matched to flatwork include slabjacking and polyurethane to raise settled slabs, void and compaction grouting, and drainage solutions to deal with the water.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#how-is-flatwork-repaired","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"Lifted or sunken flatwork: Why is my driveway or sidewalk lifting?","answer":"On expansive clay, soil under the slab swells when it gets wet and pushes thin concrete up. Frost heave in freezing weather and tree roots growing beneath the slab can also lift flatwork.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#faq-1","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"Lifted or sunken flatwork: Why is my patio sinking?","answer":"Common reasons are water washing soil out from under the slab, loose fill compressing over time, and clay shrinking as it dries.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#faq-2","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"Does cracked flatwork mean my house foundation is moving?","answer":"Not necessarily. Driveways, walks and patios are thin and lightly loaded, so they react to soil movement more readily than the house. Flatwork movement is a useful clue about water and soil around the house, but the foundation is evaluated separately.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#faq-3","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"Can flatwork send water toward my foundation?","answer":"Yes. A patio or walk that has settled or tilted toward the house can direct rain against the foundation, adding moisture to the soil there.","url":"https://terrabrain.vercel.app/signs/heaved-or-settled-flatwork#faq-4","section":"signs","topic":"Lifted or sunken flatwork"},{"question":"Why is my garage door gap uneven or the header sagging?","answer":"One side of the garage foundation may have dropped, or the lintel or door hardware may be at fault, so floor level, opening and brick are checked together.","url":"https://terrabrain.vercel.app/signs/uneven-garage-door-or-sagging-header","section":"signs"},{"question":"What does an uneven garage door look like?","answer":"The closed door touches the floor on one side and leaves a wedge-shaped gap on the other; The weather seal is crushed at one end and open at the other; The header, the beam that spans over the door opening, dips in the middle or is visibly lower at one end.","url":"https://terrabrain.vercel.app/signs/uneven-garage-door-or-sagging-header#what-does-an-uneven-garage-door-look-like","section":"signs","topic":"Uneven garage door or header"},{"question":"Uneven garage door or header: Why does it happen?","answer":"Expansive soils are common across most of Oklahoma, and seasonal moisture loss lets the clay shrink and the foundation edge move downward. If one side of the garage door opening drops more than the other, the opening tilts and the door no longer closes evenly.","url":"https://terrabrain.vercel.app/signs/uneven-garage-door-or-sagging-header#why-does-it-happen","section":"signs","topic":"Uneven garage door or header"},{"question":"Uneven garage door or header: How is it documented?","answer":"A relative floor elevation survey is the engineering step beyond a visual first impression. Readings at the two sides of the opening are compared with each other and with the house floor, since a garage floor is not always built level.","url":"https://terrabrain.vercel.app/signs/uneven-garage-door-or-sagging-header#how-is-it-documented","section":"signs","topic":"Uneven garage door or header"},{"question":"Why is the gap under my garage door wider on one side?","answer":"Either the slab or the door opening is out of level. If one side of the garage foundation has dropped, the floor and the opening tilt together and the closed door no longer meets the floor evenly. Door hardware and track adjustment can also cause an uneven gap, so the floor is measured before drawing conclusions.","url":"https://terrabrain.vercel.app/signs/uneven-garage-door-or-sagging-header#faq-1","section":"signs","topic":"Uneven garage door or header"},{"question":"What makes the brick above a garage door crack?","answer":"Brick over a wide opening is carried by a steel angle called a lintel. If the lintel deflects, the brick cracks in a pattern that is widest at the steel angle and tapers to nothing. Foundation settlement at one side of the opening can also crack the brick.","url":"https://terrabrain.vercel.app/signs/uneven-garage-door-or-sagging-header#faq-2","section":"signs","topic":"Uneven garage door or header"},{"question":"Are garage slab cracks a sign of foundation problems?","answer":"They can be. Building officials in expansive-soil areas list cracks in garage slabs among the signs of foundation movement, but concrete also cracks for other reasons, so offset and pattern are evaluated.","url":"https://terrabrain.vercel.app/signs/uneven-garage-door-or-sagging-header#faq-3","section":"signs","topic":"Uneven garage door or header"},{"question":"Why is my home addition cracking or pulling away from the house?","answer":"An addition often sits on its own foundation at a different depth or on fill, so it settles or heaves differently and the joint with the house opens up.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions","section":"causes"},{"question":"Why do additions move differently from the house?","answer":"An addition is a second structure attached to the first. Its foundation can differ from the original house in several ways, and any of them can make the two parts respond differently to the same soil:","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#why-do-additions-move-differently-from-the-house","section":"causes","topic":"Addition separating from house"},{"question":"What are the signs of an addition moving?","answer":"The distress usually lines up with the junction between the original house and the addition.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#what-are-the-signs-of-an-addition-moving","section":"causes","topic":"Addition separating from house"},{"question":"How is addition movement evaluated?","answer":"Separate checks. When additions have been made, the Texas guidelines say the overall foundation dimensions should be checked for each separate foundation element as well as for the whole foundation; Elevation surveys.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#how-is-addition-movement-evaluated","section":"causes","topic":"Addition separating from house"},{"question":"How is addition movement typically addressed?","answer":"Where the addition has settled, underpinning (installing piers or piles under the foundation) is the usual structural method.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#how-is-addition-movement-typically-addressed","section":"causes","topic":"Addition separating from house"},{"question":"Why is my addition pulling away from the house?","answer":"An addition often sits on its own foundation, which may be shallower, built at a different time, or placed on backfill. When the two foundations settle or heave by different amounts, the joint between them opens and cracks appear at that line.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#faq-1","section":"causes","topic":"Addition separating from house"},{"question":"Can backfill under an addition cause settlement?","answer":"Yes. Poorly placed fill is prone to settling, and Oklahoma transportation research describes compacted fill that keeps compressing after construction when its moisture content increases.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#faq-2","section":"causes","topic":"Addition separating from house"},{"question":"How do engineers evaluate a house with an addition?","answer":"Texas engineering guidelines say that when additions have been made, the foundation should be checked for each separate foundation element as well as for the foundation as a whole, using floor elevation surveys.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#faq-3","section":"causes","topic":"Addition separating from house"},{"question":"Addition separating from house: How much floor slope is considered noticeable?","answer":"A tilt of more than about 1 percent is usually noticeable, according to the Texas ASCE guidelines, and the Foundation Performance Association uses 1 percent as a tilt limit.","url":"https://terrabrain.vercel.app/causes/differential-movement-at-additions#faq-4","section":"causes","topic":"Addition separating from house"},{"question":"Why is my house rising after foundation repair done in a drought?","answer":"If piers set a house level while clay is dry and shrunken, returning rain swells the soil under unpiered areas, lifting them above the piered edges.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift","section":"causes"},{"question":"How does over-lift happen?","answer":"Expansive clay shrinks when it dries and swells when it wets; seasonal moisture loss lets the perimeter of a slab settle, and seasonal moisture gain pushes it back up. Clay does not move if its moisture stays constant, but moisture rarely stays constant.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#how-does-over-lift-happen","section":"causes","topic":"Over-lift after drought repair"},{"question":"Over-lift after drought repair: Why does dry-season timing matter?","answer":"The depth and degree of drying set the stage for later swelling: - In Oklahoma, the active zone, the depth of soil whose moisture changes with the climate, has been estimated at roughly 0.5 to 4 meters (about 1.5 to 13 feet), with shallow soil responding most strongly to weather. - Engineering literature reports seasonal moisture fluctuation in expansive soils ranging from about 3 to 40 feet deep, and multi-year droughts show the zone can be deeper than previously believed. - Expansive soils are most damaging where climates have pronounced wet and dry seasons, with shrink-swell cycles repeating each year.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#why-does-dry-season-timing-matter","section":"causes","topic":"Over-lift after drought repair"},{"question":"What are the signs of over-lift?","answer":"an interior floor hump that was not there before the repair; doors that bind or show tapered gaps; ceiling-wall separation at interior walls.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#what-are-the-signs-of-over-lift","section":"causes","topic":"Over-lift after drought repair"},{"question":"How is over-lift evaluated?","answer":"Texas guidelines say floor elevations should be measured after remedial work and given to the client, and that a single survey shows shape at one moment while repeated surveys show change over time.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#how-is-over-lift-evaluated","section":"causes","topic":"Over-lift after drought repair"},{"question":"How is over-lift typically addressed?","answer":"Monitor first. The Texas guidelines note that non-structural measures and monitoring may be prudent before or instead of further structural repair. See monitoring program; Re-set adjustable supports.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#how-is-over-lift-typically-addressed","section":"causes","topic":"Over-lift after drought repair"},{"question":"Why did my floors get worse after foundation repair?","answer":"If the house was lifted while the clay was dry, the soil under unpiered areas, especially the interior, can swell when rain returns. The piered perimeter is held in place while the interior rises, so new humps, binding doors and cracks can appear.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#faq-1","section":"causes","topic":"Over-lift after drought repair"},{"question":"Over-lift after drought repair: Does underpinning control the whole slab?","answer":"No. Texas engineering guidelines note that underpinning does not improve areas that are not underpinned and that its performance can be affected by soil moisture changes.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#faq-2","section":"causes","topic":"Over-lift after drought repair"},{"question":"Over-lift after drought repair: How deep does seasonal moisture change go?","answer":"Oklahoma State University research estimated the active zone in Oklahoma at roughly 0.5 to 4 meters, and engineering literature reports seasonal moisture change in expansive soils from about 3 feet to as much as 40 feet in extreme cases, deeper in multi-year droughts.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#faq-3","section":"causes","topic":"Over-lift after drought repair"},{"question":"Over-lift after drought repair: Can a house be leveled perfectly?","answer":"Texas engineering guidelines state that lifting is governed by field judgment to limit damage and that it is unlikely an elevation adjustment will produce a level foundation.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#faq-4","section":"causes","topic":"Over-lift after drought repair"},{"question":"How can I find out how dry the soil was when my house was lifted?","answer":"The Oklahoma Mesonet's statewide network of about 120 stations records soil moisture and weather, so records from a nearby station can show conditions around the date of the lift.","url":"https://terrabrain.vercel.app/causes/over-lift-heave-after-drought-lift#faq-5","section":"causes","topic":"Over-lift after drought repair"},{"question":"Why is my house settling on fill dirt in Oklahoma?","answer":"Loose fill, or fill with debris or organic matter, slowly compresses under a house. Wetting speeds it up, and it is worst where the fill is deepest.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement","section":"causes"},{"question":"What is fill and why does it settle?","answer":"Fill is soil placed by people rather than left where nature deposited it. Builders use it to level sloping lots, raise building pads, and fill ravines, ditches and old ponds.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#what-is-fill-and-why-does-it-settle","section":"causes","topic":"Settling on fill dirt"},{"question":"Where is fill settlement common in Oklahoma?","answer":"ODOT research has also characterized compressible clayey and silty alluvial soils in Oklahoma river systems at sites where settlement of fill was a known problem.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#where-is-fill-settlement-common-in-oklahoma","section":"causes","topic":"Settling on fill dirt"},{"question":"What are the signs of fill settlement?","answer":"stair-step brick cracks wider at the top, on the side over the fill; sloping floors that fall toward the fill side; diagonal drywall cracks at doors and windows.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#what-are-the-signs-of-fill-settlement","section":"causes","topic":"Settling on fill dirt"},{"question":"How is fill settlement different from look-alikes?","answer":"Collapse and consolidation of fill reduce the soil's volume, so the movement is downward and does not reverse when the soil dries. Expansive clay behaves differently, shrinking and swelling as its moisture changes; compare perimeter drying settlement.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#how-is-fill-settlement-different-from-look-alikes","section":"causes","topic":"Settling on fill dirt"},{"question":"How is fill settlement evaluated?","answer":"History. Texas engineering guidelines list cut-and-fill observations among the items in a detailed foundation report; Elevation surveys. Repeated surveys over months or years show whether the settlement is continuing; Soil testing.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#how-is-fill-settlement-evaluated","section":"causes","topic":"Settling on fill dirt"},{"question":"How is fill settlement typically fixed?","answer":"Underpinning with piers or piles that pass through the fill to firmer native soil or rock is the common structural approach.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#how-is-fill-settlement-typically-fixed","section":"causes","topic":"Settling on fill dirt"},{"question":"Why would a house built on fill keep settling?","answer":"Fill that was placed loose, poorly compacted or mixed with debris keeps compressing under the weight of the house and its own weight. Oklahoma transportation research found that compacted fill can also settle after construction when its moisture content increases.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#faq-1","section":"causes","topic":"Settling on fill dirt"},{"question":"Does fill settlement go up and down with the seasons?","answer":"Fill consolidation is a one-way process: the fill compresses and does not spring back. That is different from expansive clay, which shrinks and swells as it dries and wets.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#faq-2","section":"causes","topic":"Settling on fill dirt"},{"question":"How can I find out if my house is on fill?","answer":"Clues come from lot history and soil sampling: old aerial photos and maps, builder or grading records, and soil borings or hand-auger samples that show mixed soil colors, debris or organic material.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#faq-3","section":"causes","topic":"Settling on fill dirt"},{"question":"How is settlement on fill repaired?","answer":"The usual structural approach is underpinning with piers or piles that pass through the fill to firmer native soil or rock below. Texas engineering guidelines note that underpinning must be specified by location, size and depth and does not improve areas that are not underpinned.","url":"https://terrabrain.vercel.app/causes/fill-consolidation-settlement#faq-4","section":"causes","topic":"Settling on fill dirt"},{"question":"Why is the soil pulling away from my foundation?","answer":"Clay along the house has dried and shrunk. The gap is a moisture sign, not proof of damage, but the same drying under the slab edge lets the perimeter settle.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation","section":"signs"},{"question":"What does a soil gap look like?","answer":"The soil has separated from the foundation beam or stem wall, leaving a gap you can put a finger or a probe into. The ground nearby may be broken into many-sided blocks by cracks. These are dry-season features of clay soil.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#what-does-a-soil-gap-look-like","section":"signs","topic":"Soil gap at foundation"},{"question":"Soil gap at foundation: Why does clay pull away?","answer":"Expansive clay swells when water enters it and shrinks as it dries out. Most of Oklahoma has these soils. In the dry season they form deep cracks in roughly polygonal patterns; one documented crack was at least 32 inches deep.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#why-does-clay-pull-away","section":"signs","topic":"Soil gap at foundation"},{"question":"Soil gap at foundation: What can it mean for the house?","answer":"The slab-edge pattern works in both directions: the perimeter drops when the soil shrinks and rises when it swells. It is covered in perimeter drying settlement.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#what-can-it-mean-for-the-house","section":"signs","topic":"Soil gap at foundation"},{"question":"Soil gap at foundation: How is it documented?","answer":"Gap size. Record the width and the depth a probe reaches, and where along the house the gap is largest; Timing. Note the season and recent rainfall, since the gap reflects current moisture; Floor survey.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#how-is-it-documented","section":"signs","topic":"Soil gap at foundation"},{"question":"Soil gap at foundation: How do moisture and grading around the house matter?","answer":"Uneven moisture from lawn watering is one cause of differential movement. Federal building guidance calls for the ground next to a house to slope away, typically about 6 inches of fall over the first 10 feet, and for the grade near the foundation to be kept from settling.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#how-do-moisture-and-grading-around-the-house-matter","section":"signs","topic":"Soil gap at foundation"},{"question":"Why is there a gap between the soil and my foundation?","answer":"Expansive clay shrinks as it dries, so in dry weather it pulls back from the foundation and splits into cracks. The gap is a sign that the soil along the house has lost moisture.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#faq-1","section":"signs","topic":"Soil gap at foundation"},{"question":"Soil gap at foundation: How deep do clay shrinkage cracks go?","answer":"Dry-season cracks in expansive clay form rough polygon patterns, and one documented crack was at least 32 inches deep. The zone of seasonal moisture change can extend from about 3 to 40 feet deep depending on the site.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#faq-2","section":"signs","topic":"Soil gap at foundation"},{"question":"Does soil pulling away mean my foundation is settling?","answer":"Not necessarily, but it is a drying indicator. When clay under the slab edge shrinks, the perimeter of the slab can drop, which can show up as wall and brick cracks and skewed door and window frames.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#faq-3","section":"signs","topic":"Soil gap at foundation"},{"question":"Soil gap at foundation: Do trees make the gap worse?","answer":"Trees and large shrubs withdraw water from the soil and can cause downward foundation movement. Gaps and cracks that are worst near a tree fit that pattern.","url":"https://terrabrain.vercel.app/signs/soil-pulled-away-from-foundation#faq-4","section":"signs","topic":"Soil gap at foundation"},{"question":"Why is there a gap between my ceiling and an interior wall?","answer":"Either swelling soil has pushed the floor and wall up (foundation heave) or roof trusses have bowed up and lifted the ceiling (truss uplift).","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls","section":"signs"},{"question":"Ceiling-wall gap: What are the two possible causes?","answer":"Center heave (moisture build-up under slab); Perimeter wetting heave (edge lift); Leak-induced localized heave, since leaking pipes can worsen swelling of nearby clay.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#what-are-the-two-possible-causes","section":"signs","topic":"Ceiling-wall gap"},{"question":"Ceiling-wall gap: How do you tell them apart?","answer":"A crack where the tape is torn through at the corner, with the ceiling fastened to the truss bottoms, points toward uplift; a crack running along the edge of the tape may instead be a taping problem. See nail pops and tape-joint cracks.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#how-do-you-tell-them-apart","section":"signs","topic":"Ceiling-wall gap"},{"question":"Ceiling-wall gap: How do you document it?","answer":"Measure the gap at marked points along each affected wall; Note the date and repeat monthly through a winter and a summer; Look in the attic above the gap for trusses lifted off the top of the wall.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#how-do-you-document-it","section":"signs","topic":"Ceiling-wall gap"},{"question":"Ceiling-wall gap: What happens next?","answer":"For truss uplift, trade and inspection literature describes the problem as not structural, and fixes involve letting the ceiling drywall float near interior walls with clips or slotted connectors.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#what-happens-next","section":"signs","topic":"Ceiling-wall gap"},{"question":"Why is there a gap between my ceiling and an interior wall?","answer":"The two common causes are the floor and interior wall being pushed up by swelling soil, or the roof trusses bowing upward and lifting the ceiling. The first is foundation heave; the second, truss uplift, is a roof framing effect.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#faq-1","section":"signs","topic":"Ceiling-wall gap"},{"question":"Ceiling-wall gap: How can I tell truss uplift from foundation heave?","answer":"Truss uplift cracks typically open in winter and close in summer, and the floor stays level. Heave raises the floor and wall, which shows on a floor elevation survey and often comes with other signs such as sticking doors or floor cracks.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#faq-2","section":"signs","topic":"Ceiling-wall gap"},{"question":"Ceiling-wall gap: Should I look in the attic?","answer":"Yes. Inspecting the attic framing above the crack is part of diagnosing truss uplift; a truss bottom chord bowed up above the wall points to uplift.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#faq-3","section":"signs","topic":"Ceiling-wall gap"},{"question":"Ceiling-wall gap: Is truss uplift dangerous?","answer":"Building trade and inspection literature describes truss uplift cracks as alarming-looking but not a structural problem.","url":"https://terrabrain.vercel.app/signs/ceiling-wall-separation-at-interior-walls#faq-4","section":"signs","topic":"Ceiling-wall gap"},{"question":"Why is there a gap under my slab edge or footing?","answer":"Supporting soil has been removed, most often by running water, though settling fill, collapsing soil and slope movement can also leave a void.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing","section":"signs"},{"question":"Exposed slab edge or void: What are you seeing?","answer":"A slab-on-grade foundation has a thickened outer beam that is meant to be buried in soil, and footings under other foundation types are meant to bear on soil.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#what-are-you-seeing","section":"signs","topic":"Exposed slab edge or void"},{"question":"Exposed slab edge or void: What can cause it?","answer":"Engineering guidance for houses on expansive soil recommends keeping soil moisture steady, and suggests surrounding the building with paving or removing perimeter planter beds to limit moisture changes. See surface drainage and grading and water ponding near foundation.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#what-can-cause-it","section":"signs","topic":"Exposed slab edge or void"},{"question":"Exposed slab edge or void: How is it documented?","answer":"Probe the void with a thin rod or tape and record how far it reaches under the slab and how tall it is, at several points; Measure the length of exposed or undermined edge; Photograph each point with a ruler or tape in view.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#how-is-it-documented","section":"signs","topic":"Exposed slab edge or void"},{"question":"Exposed slab edge or void: What can it lead to?","answer":"Where support is lost, that section of the foundation can settle or crack. Check nearby walls and floors for stair-step brick cracks, horizontal cracks at the brick ledge or slab edge and sloping floors.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#what-can-it-lead-to","section":"signs","topic":"Exposed slab edge or void"},{"question":"Exposed slab edge or void: How is it repaired?","answer":"Repair usually has two parts: stopping the water or soil loss, and restoring support. Options include drainage solutions, void and compaction grouting, slope and erosion stabilization, and piering where the edge has already settled.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#how-is-it-repaired","section":"signs","topic":"Exposed slab edge or void"},{"question":"Why can I see under the edge of my slab?","answer":"Soil that once covered and supported the slab edge has been removed, most often by water running along or under the foundation. Settling fill, collapsing soil and soil creeping down a slope can also open a gap.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#faq-1","section":"signs","topic":"Exposed slab edge or void"},{"question":"Is a void under the footing serious?","answer":"A footing is designed to rest on soil. Where soil has been removed from beneath it, that section loses support and can settle or crack, so the depth and length of the void matter.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#faq-2","section":"signs","topic":"Exposed slab edge or void"},{"question":"How do I measure a void under the slab?","answer":"Probe the gap with a thin rod or tape, recording how far it goes in horizontally and how deep it is at several points, and photograph each spot with a ruler. Note where gutters, downspouts and slopes direct water.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#faq-3","section":"signs","topic":"Exposed slab edge or void"},{"question":"Can underground water create voids I can't see?","answer":"Yes. Geologists call underground soil erosion by flowing water piping, and leaking water or sewer lines are a listed cause of ground movement. Swelling clays can also crack concrete channels, and the resulting voids can lead to piping and erosion.","url":"https://terrabrain.vercel.app/signs/exposed-slab-edge-or-void-under-footing#faq-4","section":"signs","topic":"Exposed slab edge or void"},{"question":"Why is there water, condensation or mold in my crawl space?","answer":"Moisture under the house is not being controlled. Keeping humidity below 60 percent helps limit mold, along with a vapor barrier, drainage and ventilation.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl","section":"signs"},{"question":"What does crawl space moisture look like?","answer":"Puddles or saturated soil on the crawl space floor, especially after rain; Water droplets on pipes, ductwork or the underside of the floor; White, green or black growth on joists, beams or insulation, and a musty smell.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#what-does-crawl-space-moisture-look-like","section":"signs","topic":"Crawl space water and mold"},{"question":"Why do crawl spaces get wet?","answer":"Federal building guidance states that ground moisture will enter any foundation unless measures are taken, and it places a ground vapor barrier under crawl space construction. For crawl spaces built on a slightly raised mound, a vapor barrier is always recommended.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#why-do-crawl-spaces-get-wet","section":"signs","topic":"Crawl space water and mold"},{"question":"Crawl space water and mold: Why does it matter for the structure?","answer":"Unmanaged crawl space moisture can damage wood flooring and create health and property problems. Engineering repair guidance cites rotting wood members as a structural integrity concern and recommends treated lumber where members are replaced.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#why-does-it-matter-for-the-structure","section":"signs","topic":"Crawl space water and mold"},{"question":"Crawl space water and mold: What moisture controls does guidance describe?","answer":"Sealing and conditioning the crawl space is covered in crawl space encapsulation.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#what-moisture-controls-does-guidance-describe","section":"signs","topic":"Crawl space water and mold"},{"question":"Crawl space water and mold: How is it documented?","answer":"Humidity. A hygrometer (humidity meter) reading in the crawl space and in the house, compared with EPA's 60 percent guideline; Wood moisture and condition. A moisture meter on joists and beams, and probing for soft or decayed wood; Water sources.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#how-is-it-documented","section":"signs","topic":"Crawl space water and mold"},{"question":"What humidity level prevents mold?","answer":"EPA recommends keeping indoor relative humidity below 60 percent, ideally between 30 and 50 percent. EPA states that the key to mold control is moisture control.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#faq-1","section":"signs","topic":"Crawl space water and mold"},{"question":"Why is there condensation on pipes and ducts in my crawl space?","answer":"Condensation on cold surfaces such as pipes is a sign of high humidity. EPA suggests drying the wet surface, reducing the moisture source, and insulating cold surfaces such as cold water pipes.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#faq-2","section":"signs","topic":"Crawl space water and mold"},{"question":"What kind of ground cover should a crawl space have?","answer":"Inspection guidance describes a solid 6-mil vapor barrier covering the crawl space floor, overlapped at least 6 inches, taped, and run about 6 inches up the perimeter walls. Federal building guidance also places a ground vapor barrier under crawl space construction.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#faq-3","section":"signs","topic":"Crawl space water and mold"},{"question":"Can crawl space moisture damage the floor structure?","answer":"Yes. Unmanaged crawl space moisture can damage wood flooring and framing, and rotting wood members are cited as a structural integrity concern.","url":"https://terrabrain.vercel.app/signs/water-condensation-or-mold-in-crawl#faq-4","section":"signs","topic":"Crawl space water and mold"},{"question":"Why is water ponding next to my foundation after rain?","answer":"The ground is not carrying water away. On expansive clay, uneven wetting can swell soil and lift part of the foundation, and running water can erode soil.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation","section":"signs"},{"question":"Water ponding near foundation: What does this sign look like?","answer":"Puddles stay along the foundation for hours or days after rain, often at inside corners, under roof valleys, at downspouts that empty against the wall, or where flower beds sit higher than the lawn. Mulch or soil may be washed against the siding.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#what-does-this-sign-look-like","section":"signs","topic":"Water ponding near foundation"},{"question":"Why does ponding water matter?","answer":"Soil only moves when its moisture content changes unevenly across a site, and poor drainage is a named contributor. Expansive clay is widespread across Oklahoma, and when it swells under the slab edge, the perimeter can rise.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#why-does-ponding-water-matter","section":"signs","topic":"Water ponding near foundation"},{"question":"Water ponding near foundation: How do gutters and downspouts factor in?","answer":"Downspouts that discharge at the surface should release water at least 2 feet from the building; Each downspout should serve no more than about 50 feet of gutter; Gutter drains should not be connected to the perforated foundation drain.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#how-do-gutters-and-downspouts-factor-in","section":"signs","topic":"Water ponding near foundation"},{"question":"How is ponding documented?","answer":"Photograph where water stands and for how long after a rain, note where each downspout discharges, and measure how far the grade falls over the first 10 feet from the wall.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#how-is-ponding-documented","section":"signs","topic":"Water ponding near foundation"},{"question":"Water ponding near foundation: How much should the ground slope away from my house?","answer":"The International Residential Code calls for the grade to fall at least 6 inches within the first 10 feet from the foundation. Where lot lines or other barriers prevent that, the grade must slope away at a minimum of 5 percent toward drains or swales.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#faq-1","section":"signs","topic":"Water ponding near foundation"},{"question":"Why is standing water near the foundation a problem on clay soil?","answer":"Expansive clay swells when it gets wetter. Water that collects along one side of a house wets the soil unevenly, which can lift the slab edge there, and poor drainage can also erode soil around footings.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#faq-2","section":"signs","topic":"Water ponding near foundation"},{"question":"Water ponding near foundation: How far should downspouts discharge from the house?","answer":"Federal building guidance and foundation design guidance call for downspouts that discharge at the surface to release water at least 2 feet from the foundation, and advise against connecting them to perforated foundation drains.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#faq-3","section":"signs","topic":"Water ponding near foundation"},{"question":"Water ponding near foundation: How high should the slab be above the dirt?","answer":"Foundation design guidance calls for the top of the concrete to sit at least 8 inches above the finished grade next to it.","url":"https://terrabrain.vercel.app/signs/water-ponding-near-foundation#faq-4","section":"signs","topic":"Water ponding near foundation"},{"question":"Why is water seeping where my basement floor meets the wall?","answer":"Water at the cove joint and white deposits mean water is moving through the foundation, usually from poor grading, downspouts or a high water table outside.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence","section":"signs"},{"question":"Cove joint water, efflorescence: What does this sign look like?","answer":"Water at the cove joint. The cove joint is the seam where the basement floor slab meets the foundation wall. After rain, a wet line, puddle or trickle appears along that seam; Efflorescence.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#what-does-this-sign-look-like","section":"signs","topic":"Cove joint water, efflorescence"},{"question":"Why does water get in?","answer":"Hydrostatic pressure is the push of water held in saturated soil. Saturated soil against the outside of a foundation wall can push it inward, producing a horizontal crack along with signs of water intrusion. Clogged drains let water pressure build up against the wall.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#why-does-water-get-in","section":"signs","topic":"Cove joint water, efflorescence"},{"question":"Cove joint water, efflorescence: What does the guidance say about fixes?","answer":"The source of condensation or exterior water intrusion is corrected before a crystalline waterproofing coating is applied to the concrete; Surface sealants are rarely effective and can trap moisture; water is redirected away from masonry and mortar joints repointed where needed; Basement floors should slope toward drains so water can leave if the space floods.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#what-does-the-guidance-say-about-fixes","section":"signs","topic":"Cove joint water, efflorescence"},{"question":"Cove joint water, efflorescence: How is it documented?","answer":"Observe and photograph the wall and cove joint during and after a soaking rain, note which walls are wet, and check where downspouts discharge and how the yard slopes on those sides.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#how-is-it-documented","section":"signs","topic":"Cove joint water, efflorescence"},{"question":"What is the cove joint in a basement?","answer":"It is the seam where the basement floor slab meets the bottom of the foundation wall. Water that collects against the outside of the wall can show up along this seam after rain.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#faq-1","section":"signs","topic":"Cove joint water, efflorescence"},{"question":"Cove joint water, efflorescence: What does white powder on my basement wall mean?","answer":"That white deposit is called efflorescence. Inspection guidance treats white powder stains, along with musty odors, as signs of a moisture problem in the wall.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#faq-2","section":"signs","topic":"Cove joint water, efflorescence"},{"question":"Will sealing the inside of the wall stop the water?","answer":"Inspection guidance notes that surface sealants are rarely effective and can trap moisture. The usual approach is to redirect water away from the masonry and correct the source of condensation or exterior water before applying a waterproofing coating.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#faq-3","section":"signs","topic":"Cove joint water, efflorescence"},{"question":"How common are basement water problems?","answer":"A federal housing guide reported that typical construction practices could produce some water problem in as many as 1 in 3 basements within two years, and that most damp foundations are caused by improper surface drainage and poor backfill.","url":"https://terrabrain.vercel.app/signs/water-at-cove-joint-or-efflorescence#faq-4","section":"signs","topic":"Cove joint water, efflorescence"}]}