Top 10 Signs You Need Foundation Repair

Every house on Central Texas clay shows a few quirks — hairline cracks, a door that complains in August — and most of them never become anything. The trouble is that the early signs of real foundation movement look almost identical to the harmless ones, and waiting until the difference is obvious is the expensive strategy. So here are the ten signs we actually weigh on inspections, ranked roughly from subtle to serious, with what each one means on the soil between San Antonio and Georgetown. The honest theme throughout: signs justify measurement, not panic. A free elevation survey settles in an hour what guessing can't settle in a year.

1. Stair-step cracks in brick or masonry

The classic. Cracks that climb mortar joints in a staircase pattern mean the wall is bending — one section of the foundation is lower than its neighbor, and the brick is splitting the difference along its weakest lines. Width and direction matter: hairline and stable usually means monitor; widening toward the top, or cracks that break through brick faces instead of following the mortar, mean the movement is real. We've written a full breakdown of what stair-step cracks mean.

2. Doors and windows that stick — in a pattern

A door frame is a rigid rectangle sitting on your slab. Tilt the slab a quarter inch and the rectangle becomes a parallelogram: the door binds at one corner, the latch stops catching, the gap over the top runs wider on one side. One sticky door in humid weather is just Texas. Several doors along one side of the house, or one that's gotten steadily worse across seasons, is the slab talking. Here's why doors stick when a foundation moves — including the weather-vs-movement pattern test.

3. Sloping, sagging, or bouncy floors

Floors are the most honest reporters in the house because you can measure them yourself: a marble that always rolls to the same corner, a level app on a long board, furniture that needs shimming. Up to about half an inch over twenty feet is normal construction tolerance; past an inch and a half, you're in document-and-measure territory. On pier-and-beam homes the same symptom shows up as bounce — a different checklist entirely.

4. Drywall cracks above doors and windows

Openings concentrate stress at their corners, which is why cracks radiate diagonally from the tops of doors and windows before they appear anywhere else. The crack is the wall's strain gauge: wider and longer points at the leading side of the movement. Re-taped cracks that come back within a season are the tell — paint fixes paint problems, not foundation problems.

5. Gaps at trim, caulk lines, and siding

Baseboards drifting away from the floor, crown molding opening at the ceiling, caulk lines splitting at exterior joints, a countertop separating from the backsplash — these are all the finish materials reporting that the structure behind them changed shape. Individually minor; in clusters along one end of the house, they sketch a map of which section is moving.

6. Cracks in the slab or visible foundation line

Where you can see the concrete itself — garage floors, tile floors that telegraph cracks through, the exposed grade beam outside — pattern beats size. Shrinkage cracks from curing are common and cosmetic. What earns attention: cracks with vertical displacement (one side higher than the other), cracks that widen over months, or a visible dip in the foundation line when you sight down an exterior wall.

7. A chimney leaning or separating from the house

Chimneys are heavy, stiff, and often sit on their own footing — which makes them excellent early movers. A gap opening between the chimney and the wall, or a lean you can see against the roofline, means its footing is settling at a different rate than the house. Because of the weight involved, this one skips the "wait a season" stage: get it measured.

8. Nail pops and wavy walls

Rows of small circular bumps or popped fasteners along a wall or ceiling line mean the framing is racking enough to push the drywall off its nails. One nail pop is humidity; a line of them following a wall that also has cracked corners is structure. Sight down long walls in raking light — waviness you can see usually measures as real deflection.

9. Plumbing that starts acting strange

Slab movement and plumbing problems feed each other. Movement can stress and crack under-slab lines; a leaking line then soaks the clay and accelerates the movement — the leak-heave cycle. The signs: a water meter that spins with every fixture off, warm spots on the floor, drains that suddenly run slow on one end of the house, or a water bill that jumped without a reason. If plumbing symptoms and structural symptoms show up together, treat it as one problem, water first.

10. Movement you can actually date

The most serious sign on the list isn't a crack — it's speed. Anything you can watch change — a gap that opened this week, several doors failing within days, a hump growing in the floor — means the movement is active right now, almost always because water arrived suddenly somewhere it shouldn't be. That's the one scenario on this list that belongs in our emergency triage guide rather than the monitoring file.

What the signs add up to

Here's the part the billboards skip: none of these signs, alone or together, is a repair order. They're reasons to measure. A floor-elevation survey maps exactly how much each part of your slab has moved; crack mapping dates and documents what's cosmetic; and the combination tells you whether you're monitoring, planning, or acting. That inspection is free, it ends with a straight answer either way, and it converts every sign on this list from a worry into a number. If you'd rather start from your couch, the repair calculator gives you an honest educational range first — and the full signs guide goes deeper on everything above.