Why did a 1928 Tulsa basement wall need a full rebuild?

Reviewed by Preston, Oklahoma foundation repair consultant · Updated 2026-10-14

Tulsa20261-story wood frame, built about 1928, crawl space and partial basementcrawl space with partial CMU basement on continuous trench footing

In short: The north concrete-block wall of a partial basement under a 1928 Tulsa house was leaning and bulging inward at its base. It was worse than at the previous inspection, and water and soil were coming in at the bottom ¹. The engineer attributed it to long-term lateral soil and hydrostatic pressure. The engineer specified a full rebuild in reinforced, fully grouted block or cast-in-place concrete, with exterior waterproofing and a perimeter drain ¹.

What did the house show?

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 ¹. The same engineer had inspected it since 2009. A failed east foundation wall had been rebuilt and the floor re-supported. Porch column settlement was noted in 2014 and a follow-up inspection was done in 2017 ¹.

At the January 2026 inspection ¹:

• The north basement wall had significant cracking and deteriorated mortar. It showed an inward lean and bulge in the lower wall that was worse than in 2017.
• Stormwater and soil were entering at the base of the wall. The silt ran to the sump and clogged the pump.
• Steel tube columns along the wall were only bolted to the masonry, with no footing of their own, and no longer restrained it.
• The crawl space was dry. Floor framing was adequately supported on steel pipe columns on precast footings. No other structural defects were found, and site drainage was judged adequate. The house has no gutters.

What did the engineer find was causing it?

The engineer concluded the wall had failed gradually over years under long-term lateral soil pressure and hydrostatic (water) loading ¹. The soil was presumed to be silty clay with trace sand and moderate expansive potential ¹.

What repair was specified?

The engineer stated that crack repair or more bracing would not be adequate ¹. The scope was:

1. Fully reconstruct the north basement wall. Remove the block and replace it with reinforced CMU or cast-in-place concrete, fully grouted.
2. Excavate the exterior face and install an exterior waterproofing membrane.
3. Install a perimeter subsurface drain to a proper outlet where feasible.
4. Remove the steel columns. Any interior bracing must be independently supported and engineered.
5. Clean silt out of the basement and sump after the repair.
6. Have the work designed or overseen by a qualified contractor or structural engineer.

What does this case show about Oklahoma foundations?

• 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. It also calls for exterior damp-proofing and runoff collected and kept away from the foundation ². The engineer's scope here (exterior membrane plus perimeter drain) follows the same approach ¹.
• Clay changes with moisture. ASCE's homeowner guide on shrink-swell soils explains that clay expands when it takes on water and shrinks when it dries ³. The engineer presumed a silty clay of moderate expansive potential against this wall ¹.
• Bracing must bear on something solid. The failed columns were attached only to the wall they were supposed to restrain. The engineer required any future bracing to have independent support ¹.
• Progress over time matters. Repeat inspections in 2009, 2014, 2017 and 2026 let the engineer say the inward movement had gotten worse, not just that it existed ¹.

Related

• Horizontal Crack or Inward Bow in Basement Wall
• Lateral Earth, Swell & Hydrostatic Pressure on Walls
• Basement Wall Repair
• Basements
• Drainage Solutions
• Groundwater and Perched Water