Almost every Texas house has cracks somewhere. Most mean nothing. The skill — and this is genuinely learnable in ten minutes — is reading pattern and progression instead of panicking at a single crack.
Signs that deserve attention
- Stair-step cracks in brick or block. Diagonal cracking following the mortar joints is the classic signature of differential foundation movement — one part of the foundation moving relative to another.
- Doors and windows that rack. Frames go out of square as the structure twists. A door that sticks every August and frees up in January is tracking the soil-moisture cycle.
- Cracks radiating from door and window corners. Interior drywall telegraphs movement early — corners of openings concentrate stress.
- Sloping floors. If you can feel the slope, or furniture visibly leans, get elevations taken.
- Separations. Trim pulling from walls, cabinets from ceilings, brick from window frames, expansion joints opening — gaps that grow or cycle seasonally.
- Exterior slab-edge cracks, especially at garage corners, the least-protected part of most slabs.
Signs that are usually cosmetic
- Hairline vertical cracks in drywall or concrete that never change
- Shrinkage cracks in a garage slab surface (spiderweb or straight-line, flat across)
- A single crack that appeared after construction and stopped
The monitoring protocol (free, and genuinely useful)
- Photograph every crack with a coin or tape measure for scale.
- Write the date on a piece of tape at the crack tip.
- Re-check quarterly, and after big weather swings — drought breaking, hard freeze thawing.
- Watch doors: pick two or three “indicator doors” and note when they stick.
Progression is the verdict. Cracks that widen, lengthen, or multiply season over season mean active movement. Stable cracks mostly mean history, not emergency.
Why this happens more in Texas
Most of the state sits on expansive clay that swells when wet and shrinks when dry — the soil region under your city determines how violent the cycle is. Blackland Prairie and Gulf Coast clays are the most active; limestone Hill Country moves differently (differential, not cyclical); West Texas failures are usually water-event-driven.
When to stop monitoring and call
- Any crack wider than about 1/4 inch, or with vertical offset (one side proud of the other)
- Horizontal cracks in a stem wall or basement wall
- Doors/windows that have stopped latching entirely
- Slopes you can feel underfoot, or that a level confirms across a room
- You’re buying or selling and need documentation either way
A proper evaluation takes elevation readings across the slab — actual measurements, not a walkthrough and a guess. What it costs and what happens next: what foundation repair costs in Texas, and if you’re unsure whether you need repair at all, start with do I actually need foundation repair?