Foundation
Cosmetic vs. Structural Foundation Cracks
Updated · Holdfast editorial
Short answerThin vertical cracks in poured concrete are usually shrinkage and cosmetic (though they may leak). Horizontal cracks, stair-step cracks, cracks wider than about 1/4 inch, or cracks with offset edges suggest movement and need assessment.
Usually cosmetic
- Hairline vertical cracks
- No offset
- Not growing
Get it checked
- Horizontal
- Stair-step
- Wider at one end
- Offset or growing
Next
When to call for an assessment
- Horizontal cracks in block walls
- Stair-step cracks that widen
- Cracks wider than about 1/4 inch
- One side of the crack offset from the other
- Doors and windows upstairs starting to stick
Cosmetic vs. Structural Foundation Cracks: follow-up questions
Are vertical cracks in poured walls normal?
Thin vertical shrinkage cracks are common in poured concrete. They're usually cosmetic but can leak and are often sealed with injection.
Can I patch a crack myself?
Hairline cracks can be sealed with DIY kits, but leaking or widening cracks should be assessed first.
Every home differs; editorial standards.