When water under the house pushes the slab up
Settlement gets most of the attention, but on expansive clay the opposite also happens: soil under the house absorbs water and swells, pushing part of the slab up. This is called heave, and one of the most common causes is a leaking drain or water line under the slab.
Signs of heave
- A hump or high spot in the middle of the house
- Cracks in interior tile or slab radiating from one area
- Doors near the high spot binding at the top
- Higher-than-normal water bills, a meter that moves with all fixtures off, or a warm spot on the floor (hot water leak)
- Sewer gas odor or slow drains (drain leak)
Why it matters
Piers are designed to stop settlement. If the problem is heave, lifting the perimeter to match a raised center can make the house worse. A proper evaluation looks for heave before recommending piers.
How it's fixed
- Plumbing leak test (water supply pressure test and hydrostatic test on drains)
- Repair or reroute the leaking line
- Allow soil to dry and stabilize, sometimes months
- Re-evaluate elevations and level the perimeter only if still needed
Related Foundation Repair Topics
Frequently Asked Questions
Who do I call first, a plumber or a foundation company?
If you suspect a leak, start with a plumbing leak test. Many foundation pros will request one before quoting a lift.
Does insurance cover slab leaks?
Some Oklahoma policies cover access and repair of the leaking pipe and resulting water damage, but not the foundation movement itself. Check your policy.
Ready for a straight answer? Tell us about your project and we'll connect you with a licensed, insured local pro for a written quote.
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