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How to Fix a Cracked Basement Wall

A long, horizontal crack in a basement block wall may indicate a dangerously weakened wall.

FH04JAU_CRACKW_01-2Family Handyman
Cracks in basement walls are common, but they can also be a sign of a weaken wall. We'll tell you how to handle this potentially dangerous wall before it leads to structural problems with your house. It's a problem that must get fixed before you finish your basement.

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Time
One day
Complexity
Complex
Cost
$100 – $500

Cracked basement walls

This basement has a crack running horizontally along the block concrete wall. There's also a stair-step crack on each end of the horizontal crack, and the wall is bowed in about 1 in. You can't handle this cracked wall by simply filling the crack and finishing off the basement. If you only had the stair-step cracks, you could go ahead with your basement finish work, because that type of crack is a normal sign of settling. Stair-step cracks may cause cracks in other walls above or a door to rub, but they don't compromise the strength of the foundation.

However, the horizontal crack that has bowed the wall inward is the sign of a severely weakened wall that can fail. Even if it has been stable for awhile, it can no longer reliably support the load it's supposed to carry. If your basement has this problem, our advice is to ask a local general contractor or building official to direct you to a structural engineer who can examine the wall and surroundings and suggest the correct method to reinforce the wall.

Required Tools for this Project

No tools are needed for the inspection. The tools needed for the fix depend on what's recommended by the structural engineer.