Drywall is the thinnest, most honest surface in your house — it cracks before almost anything else does. Most of its cracks are innocent. Here's how to tell the innocent ones from the messengers.
Drywall cracks follow stress, and stress concentrates at openings. The classic location is the corner of a door or window frame, running diagonally up and away at roughly forty-five degrees — the interior echo of the same differential movement that draws stair-step cracks in the brick outside. When the foundation drops on one side, the wall framing racks, the rigid drywall sheet can't flex with it, and it tears at its weakest geometry: the corners.
Geography is the first diagnostic. Cracks radiating from openings on one side of the house, especially when the same side shows exterior signs, are telling one story together. A crack at a ceiling joint in the middle of the house, or a straight seam crack where two sheets meet, is usually telling another — tape and texture, not soil. The full exterior picture lives on our foundation warning signs page; this page is the interior half.
Not every wall crack is a foundation memo. Nail pops — small circular bumps or cracks where drywall screws work loose as lumber dries — are cosmetic and stay cosmetic. Straight vertical cracks at sheet seams, hairline and stable, are usually finishing failures, not movement. Shrinkage cracks in a new home's first year, as framing lumber dries and settles into itself, are normal and expected — builders call it the house exhaling.
The innocents share three traits: they're hairline, they don't grow, and they don't bring friends. No sticking doors in the same rooms, no gaps opening at baseboards or crown, no matching cracks outside. A crack with all three traits gets a photograph and a calendar entry, not a contractor.
The single loudest drywall signal is a crack that comes back after you patch it — especially in the same place, in the same shape, within a season or two. Patch compound is rigid; if the wall is still moving, the repair tears exactly where the original did. A recurring crack is not a patching problem. It is the house demonstrating, on schedule, that the movement hasn't stopped.
Watch for the supporting evidence while you're at it: cracks that widen at one end, cracks wider than a credit card's edge, tape peeling or bubbling along a seam that used to be flat, doors in the same rooms starting to rub, and baseboards separating from walls or floors. Interior cracks that pair with exterior signs — the stair-step cracks in brick on the same side of the house — stop being a question and become a measurement appointment.
Before any evaluation, you can build the evidence yourself. Photograph each crack with a coin in frame for scale. With a pencil, draw a short line across the crack and date it on the wall in the corner's shadow — if the line's halves separate, the crack moved, and the date tells you when. Keep a simple log: room, wall, date, width estimate, season. Three entries over a year will tell you — and any evaluator — whether your walls are stable, seasonal, or trending.
Seasonal entries deserve respect rather than alarm: Texas clay breathes, and a crack that opens a hair every August and closes every April is riding the moisture cycle. Evening out the moisture — gutters that discharge away from the house, no ponding at the slab — is what our drainage correction service exists for, and it's sometimes the whole prescription.
Escalate to a free evaluation when cracks recur after patching, widen measurably, cluster on one side of the house, or pair with any exterior sign. A Metro evaluation maps the cracks against elevation readings across your floors and tells you in writing whether you're looking at piers, drainage, monitoring, or a paintbrush. The cost picture, if piers enter it, is published on our foundation repair cost page. The evaluation is free: (817) 670-4474 — and The Foundation Repair Report is free in our guide if you want to read before you call.
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