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What Causes Concrete to Sink?

Sunken concrete usually points to something happening under the slab. Fixing the surface alone rarely solves it long term.

Common underlying causes

Poorly compacted fill

Backfill that was not properly compacted continues to settle for years.

Soil movement

Expansive soils shrink and swell with moisture cycles.

Erosion

Water flowing under or beside the slab can carry base material away.

Voids

Broken pipes, tree roots or old excavations can create empty spaces under the slab.

Repair vs. replacement

Lifting options

Some settled slabs are candidates for lifting; others are not, depending on the slab condition and how much has moved.

Replacement

When the slab has cracked, tilted or the base has failed broadly, replacement usually delivers a better long-term result.

Frequently Asked Questions

Will a sunken slab keep sinking?

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It may, especially if the underlying cause is not addressed.

Is drainage always part of the problem?

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Not always, but drainage is one of the most common contributors and worth reviewing early.

Request a Concrete Evaluation

Call (254) 414-0511 or use the estimate form to share your project details. We follow up to review your project and next steps.

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