Slab Foundation Repair: Methods, Costs, and What to Expect
A comprehensive guide to slab-on-grade foundation repair including piering, foam injection, and drainage solutions.
Slab-on-grade foundations are the most common foundation type in the southern United States. When they develop problems, repair options range from simple crack sealing to full piering.
Common Slab Foundation Problems
Heaving
Upward movement caused by expanding clay soil or frost. Creates high spots in the slab.
Settlement
Downward movement when soil compresses or erodes. Creates low spots and cracks.
Cracking
Stress cracks from soil movement, curing shrinkage, or structural overload.
Plumbing Leaks
Under-slab plumbing leaks erode soil and cause localized settlement.
Repair Methods Compared
Steel Piering (Push Piers)
Steel piers are driven to bedrock or stable soil, then used to lift the slab back to level. Most permanent solution.
Cost: $1,000-$3,000 per pier | Lifespan: Permanent
Polyurethane Foam Injection
High-density foam is injected under the slab to fill voids and lift the concrete. Less invasive than piering.
Cost: $2,000-$5,000 | Lifespan: 10-15 years
Mudjacking
Cement slurry pumped under the slab. Most affordable but least durable. Best for minor settling.
Cost: $500-$1,500 | Lifespan: 5-10 years
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