Leaks by source

Slab leak water damage

A slab leak is a leak in a water or drain line under your concrete foundation. North Texas clay soil swells and shrinks with rain and drought, which stresses pipes under slabs. Signs include a warm spot on the floor, a meter that moves with everything off, and wet flooring with no visible source.

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Leaks by source

Technician tightening a pipe fitting with a wrench — Stock photo

Most DFW homes sit on concrete slabs over expansive clay. In wet spring months the soil swells; in dry August it shrinks and cracks. That movement, along with abrasion and corrosion, can wear through copper or cast iron lines running under the slab. Hot water lines often fail first, which is why a warm spot on tile is a classic clue.

A leak detection specialist or plumber finds the leak with acoustic and thermal tools, then repairs it by tunneling, cutting through the slab, or rerouting the line through walls and attic. The restoration side dries flooring, baseboards and drywall that got wet and replaces what can't be saved.

Slab leak water damage at a glance

DFW cause: Expansive clay soil movement, corrosion
Signs: Warm floor, meter moving, wet flooring
Repair: Tunnel, slab cut or reroute by a licensed plumber
Drying: Flooring, baseboards and lower walls

Signs you need slab leak water damage

A warm or damp spot on a tile or wood floor
The water meter moves when every fixture is off
A water bill much higher than normal
Sound of running water with nothing on
Cracks in flooring or baseboards pulling away

How the job works

Detect
A plumber or leak detection company pinpoints the leak under the slab.
Repair the line
The pipe is repaired or rerouted by a Texas-licensed plumber.
Remove wet materials
Damaged flooring and baseboards are removed so the slab and walls can dry.
Dry and restore
Dehumidifiers and air movers dry the slab surface and walls, then flooring is replaced.

What affects the cost

Every job is priced after an inspection, and your insurer may cover part of it. These are the factors that move the number:

Leak detection
Repair method: tunnel, slab cut or reroute
Flooring removed and replaced
Drying time for the slab
Foundation evaluation if movement is severe

What you can do before help arrives

Safe to do

Do a meter test: turn off all water and watch the meter for 15 minutes
Shut off the main if water is surfacing
Keep records of water bills

Stop and call

Don't jackhammer the slab yourself
Don't lay new flooring over a damp slab
Don't ignore a warm spot on the floor

Questions about slab leak water damage

Does homeowners insurance cover slab leaks?

It depends on the policy. Some pay to access the pipe and repair resulting water damage but not the pipe itself; others exclude foundation-related water damage. Read the water and foundation sections of your policy.

Why are slab leaks common in Dallas–Fort Worth?

Expansive clay soil moves with wet and dry seasons, which puts stress on pipes under the foundation.

Is rerouting better than breaking the slab?

Often, for supply lines. Rerouting through walls or the attic avoids breaking the foundation and replaces aging pipe in the process. Drain line leaks usually require slab access or tunneling.