When is cosmetic crack repair enough?
In short: Cosmetic repair means fixing drywall, masonry, trim, doors and flooring without structural foundation work. It is the complete repair when cracks come from something other than foundation movement, or when movement has stopped. When an active soil mechanism is still moving the house, cosmetic repairs reopen, which is why the movement trend is checked first.
When is cosmetic repair the whole answer?
Not every crack means the foundation is moving. Several common causes of cracking leave the foundation sound:
| Cause | Why it is not foundation movement | Page |
|---|---|---|
| Concrete shrinkage | Concrete shrinks as it dries; adding 2 gallons of water per cubic yard increases shrinkage about 20% 2 | Material shrinkage and thermal cracking |
| Floating slab cracking | Guidance for slabs on swelling soils states that some cracking of floating slabs should be expected 4 | Visible slab cracks |
| Roof truss uplift | Movement in the roof framing above the ceiling, not in the foundation | Truss uplift |
| Drywall fasteners and tape | Defects in the finish materials themselves | Nail pops and tape-joint cracks |
| Movement that has stopped | The foundation moved in the past but is no longer moving | Monitoring confirms it |
Truss uplift and drywall fastener problems look like foundation distress but come from the framing above or from the finishes themselves; the linked pages explain how each is recognized.
Why does the movement trend decide?
Expansive soils, usually clays, can cause excessive cracking of floors, walls and foundations as they shrink and swell 5. In clay, moisture change follows wet and dry seasons and can reach from 3 to 40 ft deep 3. Researchers describe corner supports that are lifted in the wet season and lose grip and drop in the dry season 3. A crack that closes in spring and reopens in August fits that cycle.
Because of that seasonal cycle, one inspection cannot show whether a house is:
- Stable: small seasonal movement with no overall trend.
- Seasonally active: movement that repeats each year, in step with soil moisture 3.
- Progressively moving: steady one-direction change, which points to an active mechanism such as settlement or a leak.
Readings repeated across seasons, as described in the monitoring program and elevation surveys pages, sort a house into one of these groups. Home inspection standards treat cracked drywall, cracked brick, out-of-square door frames and unlevel floors as signs of possible movement to report, and leave structural judgment out of the inspection 1.
What does cosmetic repair include?
- Drywall crack repair and re-taping.
- Brick and mortar repair (repointing) and sealing of veneer cracks.
- Trim, baseboard and crown molding adjustment.
- Door and window adjustment: re-hanging, planing or re-setting strikes.
- Floor covering repair over slab cracks.
- Keeping cracks and separations filled in the paving or moisture barriers around the foundation, which engineering guidance for swelling soils lists as a maintenance item 4.
When is cosmetic repair a supporting step?
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.
Cracks that open and close with the seasons are covered in detail in cracks that open and close seasonally.
Related
- Monitoring Program
- Material Shrinkage and Thermal Cracking (Mimic)
- Truss Uplift (Mimic)
- Cracks That Open and Close Seasonally
- Elevation Surveys
Common questions
Can I just patch cracks without fixing the foundation?
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.
How do I know if foundation movement has stopped?
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.
Are hairline cracks in new concrete normal?
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.
Do cracks that open and close with the seasons need structural repair?
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.
Sources
- InterNACHI Home Inspection Standards of Practice InterNACHI
- Inspecting the Concrete, Cracking, and Water Connection (IRC R406) InterNACHI
- Damage to Foundations from Expansive Soils Missouri University of Science and Technology (J. David Rogers, Robert Olshansky, Robert B. Rogers)
- Home Construction on Shrinking and Swelling Soils (Special Publication 11) Colorado Geological Survey (Holtz and Hart, 1978)
- Guide to Use of the FHA Soil PVC Meter (HUD Handbook 4075.15) U.S. Department of Housing and Urban Development
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