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The repair methods, and what each one fixes
Crack injection is the fix for minor, stable cracks in a poured wall. A contractor injects epoxy or polyurethane to seal the crack and keep water out. It addresses the crack itself, not a moving foundation, so it suits cosmetic and early cracks.
Slab-jacking, also called mudjacking or polyjacking, lifts a sunken concrete slab back into place. The crew pumps a slurry or foam beneath the slab to raise it. It fixes a settled patio, walk, or garage floor, but not a settling house foundation.
Piers and underpinning are the structural fix for a settling foundation. Steel or helical piers are driven down to stable soil, then used to stabilize or lift the foundation. Bowing-wall bracing is different again: carbon-fiber straps or steel beams hold a wall that soil pressure has pushed in.
Reading the warning signs
Cracks tell you a lot by their direction. Thin vertical cracks are usually curing and cosmetic. Horizontal cracks in a basement wall suggest soil pressure pushing inward. Stair-step cracks in brick or block often point to uneven settling below.
Doors and windows are quiet indicators. A door that suddenly sticks, or a gap opening over a window frame, can mean the foundation has shifted. When several doors and windows go out of square at once, the frame of the house is likely moving.
Floors and ceilings round out the picture. A floor that slopes or feels uneven, and a gap where the wall meets the ceiling, both suggest movement rather than a surface flaw. One symptom may be minor. A cluster of them, appearing together, is the signal to get an inspection.
How bad is it — cosmetic or structural?
Cosmetic problems live in the surface, not the structure. A hairline crack from concrete curing, or a little settling in a non-load area, looks alarming but does not threaten the home. These often need sealing at most, and sometimes only monitoring.
Structural problems involve the foundation carrying the house. Horizontal cracks, a bowing wall, clear settling, and sloping floors point here. These do not fix themselves, and they tend to worsen as the underlying cause keeps working on the foundation.
When you cannot tell the two apart, that uncertainty is exactly what a structural engineer resolves. The engineer measures the movement and names the cause. That report is the honest line between a crack you seal and a foundation you underpin.
Why soil and drainage are the real cause
Foundations rarely fail on their own. The ground around them moves. Expansive clay swells when wet and shrinks when dry, and that constant motion pushes and pulls on the foundation until something cracks or settles.
Water is the common thread. Poor drainage, gutters that dump against the house, and a high water table all raise hydrostatic pressure against the walls. Tree roots drawing moisture from the soil add their own uneven movement underneath.
This is why fixing only the symptom disappoints. If you seal a crack but leave the drainage that caused it, the pressure returns and so does the crack. A lasting repair pairs the structural fix with better drainage, grading, and water control around the home.
Repair now, or monitor?
Not every crack demands action today. A thin, stable, cosmetic crack can be watched. Mark its ends with a pencil and date, and check whether it grows over the seasons. A crack that stays put is telling you it is not urgent.
Some signs argue for acting sooner. A crack that keeps widening, a wall that is visibly bowing, and floors that grow more uneven all show active movement. Active problems get harder and costlier to fix the longer the cause keeps working.
When in doubt, get an inspection before you decide. An engineer can tell you whether the movement is active or settled, which turns the repair-versus-monitor question from a guess into a plan.
Common questions
Common questions
The practical details.
Are foundation cracks serious?
Some are, some are not. Thin vertical hairline cracks are usually cosmetic curing cracks. Horizontal cracks, stair-step cracks in brick, and any crack that keeps widening are the serious ones, because they can signal soil pressure or settling. When a crack worries you, have it inspected.
What foundation repair method do I need?
It follows the cause. A minor, stable crack usually needs epoxy or polyurethane injection. A sunken slab needs slab-jacking. A settling foundation needs piers or underpinning, and a wall pushed in by soil needs carbon-fiber or steel bracing. A structural engineer report confirms which one fits your home.
Is my foundation problem cosmetic or structural?
Cosmetic problems stay in the surface: hairline curing cracks and minor settling that does not affect how the home stands. Structural problems involve the foundation itself, and show up as horizontal cracks, bowing walls, clear settling, or sloping floors. If you cannot tell, a structural engineer can measure the movement and settle the question.
Should I fix my foundation now or wait?
Watch a thin, stable, cosmetic crack; mark its ends and see if it grows over time. Act sooner on active movement, such as a widening crack, a bowing wall, or floors that keep getting more uneven, because active problems worsen and cost more the longer you wait. An inspection tells you which case you have.
Next step: use the foundation repair cost calculator to get an itemized, state-adjusted estimate for your project. Last reviewed 2026-08-15.