# Concrete Cracks: Repair or Replace?

> Hairline and stable surface cracks repair fine. Widening or structural cracks need foundation work first.

URL: https://austinconcretefinishes.com/guide/which-concrete-cracks-can-be-repaired-vs-replaced/
Last-Modified: 2026-06-25

![Concrete crack types — hairline vs structural](/images/featured/concrete-crack-types-diagram-hairline-versus-struc.webp)

## Hairline and surface cracks are routine

Most concrete cracks are surface-level cosmetic issues, not structural. Hairline cracks (less than 1/16”), shallow surface cracks, and stable wider cracks are all candidates for 

Cracked Concrete Repair

[/cracked-concrete-repair/ →](/cracked-concrete-repair/)

 as part of resurfacing or coating prep.

The technique is:

1.  Chase the crack with a saw or grinder to widen it slightly
2.  Fill with polymer-modified patch material
3.  Bridge with an elastomeric membrane
4.  Resurface or coat on top

The result is a fix that doesn’t telegraph through the new finish.

![Hairline cracks being chased](/images/content/hairline-surface-cracks-being-chased-and-filled-as.webp)

## When the slab is the problem

Some cracks indicate something bigger — and need different intervention:

-   **Widening cracks** (getting bigger over months) — active movement
-   **Cracks with offset edges** (one side higher than the other) — settlement
-   **Cracks through slab AND walls** — foundation issue
-   **Cracks with water flowing through** — drainage or foundation
-   **Wide structural cracks** (over 1/4”) — typically structural

For these, we recommend a foundation contractor before any decorative finishing work. We’re upfront about scope: surface crack repair is in our wheelhouse, structural slab leveling and pier work is not. We’ll diagnose during the quote and tell you straight.

## Frequently Asked Questions

How wide is too wide for repair? +

Over 1/4 inch wide, or widening, is concerning. Often signals structural movement underneath.

What about cracks through both the slab and into walls? +

That's foundation. Foundation contractor first, then we resurface.

Will a repair crack again? +

Not if it's bridged with an elastomeric membrane. Rigid patches do come back.

Related Service

## Learn more about Cracked Concrete Repair

Surface crack repair as part of resurfacing and coating prep (non-structural).

View Cracked Concrete Repair

[/cracked-concrete-repair/ →](/cracked-concrete-repair/)

## Related Guides

### How Clay-Soil Slab Movement Causes Cracks in Austin

Central Texas expansive clay moves with every wet-dry cycle. Surface cracks are the symptom. Crack-bridging finishes handle it.

[How Clay-Soil Slab Movement Causes Cracks in Austin →](/guide/how-clay-soil-slab-movement-causes-cracks-austin/)