Crack in Wall Repair

What Causes Wall Cracks

• Gradual foundation settling as a home ages
• Expanding and shrinking clay soil that shifts with rainfall and dry spells
• Changes in structural load from renovations or added weight, like a kitchen island or a countertop upgrade the home wasn't originally designed to carry

When a Crack Is a Bigger Problem

Not every crack signals structural trouble — hairline cracks in drywall from normal settling are common. But stair-step cracks in exterior masonry, cracks wider than a quarter inch, cracks that keep growing, or cracks paired with sticking doors and sloping floors point to foundation movement that needs to be addressed at the source, not just patched over.

Reading the Crack

The shape and direction of a crack tell you a surprising amount before anyone gets under the house.

• Stair-step cracks in brick or block follow the mortar joints diagonally. They almost always mean differential settlement — one part of the foundation has moved relative to another.
• Vertical cracks are the most common and usually the least alarming, often from normal curing and shrinkage, particularly in poured walls.
• Horizontal cracks in a foundation wall are the ones to take seriously. They suggest pressure pushing the wall inward from the soil outside rather than the house settling downward.
• Diagonal cracks from the corners of doors and windows run from the weakest point in the framing and tend to follow structural movement rather than cause it.
• Cracks wider at one end than the other show which way the movement is going — the wide end is where the two sides are separating most.

Is It Still Moving?

More useful than how big a crack is, is whether it is active. A house that settled two decades ago and stopped is a different problem from one settling now, and the same-sized crack can mean either.

You can find out for nothing. Mark each end of the crack with a pencil line, write the date beside it, and look again in three months. If the marks have separated, the movement is ongoing and the cause needs addressing. If they have not, the crack is a scar rather than a symptom.

Patching an active crack is the most common wasted repair we see. The filler is stronger than the reason the wall moved, so the crack simply reopens — usually in the same place, usually within a year.

Our Repair Approach

We start with an inspection to determine whether a crack is cosmetic settling or a symptom of foundation movement. If it's structural, we address the cause first — foundation stabilization, drainage correction, or support work under the house — then repair the crack itself so it doesn't reopen.

And if it is genuinely cosmetic, we will say so. Not every crack is a foundation job, and a contractor who tells you every crack is one is worth being wary of.