Concrete Crack Severity Guide
Our analyzer rates every concrete crack on a 1–5 severity scale. Here's what each score means, what action it calls for, and where the line is between a DIY weekend job and a structural engineering problem.
The 1–5 Scale
Hairline crack, under 1/16 inch wide, no displacement, no staining. Stable and purely cosmetic.
Action: Monitor; seal if in freeze-thaw climate
Crack slightly wider than hairline, minor spalling at edges, still no displacement. Surface integrity intact.
Action: DIY crack filler + sealer
Crack approaching 1/4 inch, minor displacement possible, or coverage of a large area. Beyond DIY threshold.
Action: Call a contractor before attempting repair
Visible displacement, width over 1/4 inch, active movement, rust staining, or delamination. Structural capacity may be affected.
Action: Licensed contractor; structural engineer if in structural element
Significant displacement, severely compromised structural element, rebar exposure, or progressive failure. Do not delay.
Action: Structural engineer immediately
Detailed Guidance by Severity Range
Cosmetic Damage
Severity 1–2 cracks are surface-level with no structural implication. DIY repair products are appropriate. Learn what to buy and how to apply it.
Read guide →When to Call a Contractor
Severity 3 cracks exceed the DIY threshold but are not yet a structural emergency. A professional assessment determines the right repair approach.
Read guide →When to Call a Structural Engineer
Severity 4–5 cracks involve structural risk signals: displacement, width, rebar corrosion, or location in a load-bearing element. Urgent action required.
Read guide →Related Resources
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