7 signs your San Antonio home needs foundation repair

Searching signs of foundation problems at 11 p.m. after noticing a new drywall crack is a San Antonio rite of passage. Expansive clay makes every crack feel urgent. Most deserve documentation; fewer demand emergency piering. Here are seven signs that actually correlate with structural movement on local soil , and what to do about each.

1. Stair-step cracks in brick veneer

Cracks that follow mortar joints in a step pattern often signal differential settlement, one section of the footing dropped while another held. On north Bexar clay, these frequently widen after the first heavy spring rain following drought. Measure width: at or above 1/8 inch warrants a professional look.

2. Doors and windows that stick or will not latch

Seasonal stickiness happens on humidity alone. Structural stickiness is persistent, often worse on the second floor, and progresses over months. If three doors in one zone of the house fail together, the box is twisting , not just one swollen jamb.

3. Sloping or bouncy floors

Roll a marble or use a phone level app along hallways. More than roughly 1 inch of slope over 15–20 feet exceeds what most framers consider tolerable. Pier-and-beam homes in Alamo Heights show this as soft spots before drywall cracks appear.

4. Gaps at ceilings, baseboards, or exterior trim

Separation between crown molding and ceiling, or exterior brick pulling from window frames, means the structure shifted enough to break finished surfaces. Photo these quarterly, progression matters more than a single snapshot.

5. Cracks that open after rain (only)

Clay swells when wet. Cracks that visibly grow within days of a storm are communicating active soil pressure , a hallmark of San Antonio movement. Hairlines that never change through seasons are lower priority.

6. Garage slab separation

The garage slab is thinner and sits at the perimeter where moisture swings are worst. A gap between garage floor and driveway often appears before interior symptoms. Common call in Cibolo and Schertz subdivisions.

7. Horizontal or diagonal cracks in block walls

Vertical hairlines in drywall: often cosmetic. Horizontal cracks in masonry or long diagonal lines from window corners: higher concern. Pair with foundation crack repair evaluation before repainting.

When to call (and when to monitor)

Call now: multiple signs together, rapid change after weather, or any sloping floor. Monitor 90 days: single thin vertical drywall crack, level floors, doors fine, mark ends with pencil and photograph.

A free inspection with elevation survey costs nothing and beats Reddit diagnosis. About one in five visits we clear the foundation and recommend watering or drainage only.