Plumbing Leaks Under Slabs and Foundation Damage

Most Central Texas foundation problems start dry — drought pulling moisture out of the clay. The slab leak is the inverse: a problem that starts wet, pushes up instead of sinking down, and follows a completely different repair playbook. Confusing the two is expensive in both directions.

How a leak moves a foundation

Water and drain lines run beneath your slab. When one leaks, it feeds moisture into clay that would otherwise stay at steady dampness under the protected center of the house. The clay does what clay does — swells — and the slab above it heaves upward in a hump centered near the leak. Doors near the middle of the house stick while corner doors behave; floors develop a rise you can sometimes feel barefoot; cracks open in a radiating pattern rather than at corners.

The warning signs with water in the story

• A water bill that crept up without explanation
• Warm spots on the floor (hot-line leaks announce themselves)
• The sound of running water with everything off
• Damp soil or unusually happy grass along one side of the house in a dry month
• Movement symptoms appearing in the middle of the house first — the giveaway pattern

The repair order matters enormously

The sequence is: plumber first, measure second, structure third. Fix the leak, let the plume start drying, and re-survey elevations a few weeks later. Much of the heave typically relaxes on its own — piering during the swell locks the error in. Companies that quote piers the same week as an active leak are repairing a moving target with your money. (This sequencing is also written into our warranty terms: unrepaired leaks are the one thing no pier system can out-engineer.)