Foundation
Horizontal Crack in a Basement Wall: What It Means
Updated · Holdfast editorial
Short answerA horizontal crack in a block basement wall usually means soil pressure is pushing the wall inward. It should be measured and monitored; repairs range from carbon fiber and steel beams to wall anchors or rebuilding, plus drainage to relieve pressure.
Warning signs
- Wall leaning at the top
- Crack widening
- Stair-step cracks at corners
Monitoring
Mark crack ends and measure plumb at intervals.
Repairs
Monitoring before repair
Mark the ends of the crack with a pencil and date, and measure the wall's inward bow with a level or string line every few months. Growth in length, width or bow means the wall is still moving and should be stabilized soon.
Horizontal Crack in a Basement Wall: What It Means: follow-up questions
Should I get a structural engineer for a horizontal crack?
It's wise when the wall has bowed noticeably, the crack is widening, or you're selling the house. An engineer's letter documents the condition and the fix.
Can wall anchors pull a wall back straight?
Anchors can stabilize a wall and sometimes gradually pull it back; heavily displaced walls may need rebuilding.
Every home differs; editorial standards.