A slab leak is a plumbing leak in the pipes that run beneath or inside a concrete foundation slab. Because the pipes are buried, the first signs are usually indirect: a floor that feels warm, a water bill that quietly climbs, tile that pops or cracks, or a persistent damp smell. Water finds its way to the surface through cracks, expansion joints, and the edges of the slab, and then wicks upward into baseboards, drywall, cabinets, and flooring.
Restoration for slab leaks involves finding where the water went, removing flooring and materials that are saturated, and drying the slab and the building. Concrete holds a lot of water and dries slowly, so specialized drying, often with heat and dehumidification, is needed. You will also need a plumber or leak detection company to locate and repair the pipe; we coordinate our work with theirs.
Signs you need slab leak damage help
- Warm spots on the floor without a heating system
- The sound of running water when everything is off
- Unexplained increases in your water bill
- Cracks in tile or grout, or loose tiles
- Damp carpet, wet baseboards, or a musty smell
- Low water pressure
How our slab leak damage process works
- Confirm and stop the leakA licensed plumber or leak detector locates and shuts off the leaking line.
- Extract surface waterAny water that has surfaced is extracted from floors and lower walls.
- Map moistureMeters and thermal imaging show how far water has traveled under flooring and into walls.
- Remove saturated flooringWet carpet, pad, laminate, and some tile installations are removed so the slab can breathe.
- Dry the slab and structureDehumidifiers, air movers, and specialty floor-drying systems remove moisture from the slab and adjacent materials.
- Mold prevention and documentationAntimicrobial treatment where needed, plus photos and moisture logs for your claim.
Why this is different in Florida
Florida is slab country. Most homes here are built on concrete slabs, with plumbing lines running underneath or through the foundation. Older homes may have copper lines that corrode in aggressive soils or from water chemistry, while others have galvanized steel or polybutylene lines. Shifting soil, sinkhole activity, and drainage problems can stress pipes as well.
Slab leaks are so common in Florida that many plumbing companies offer specialized detection. Because the water is under the slab, the damage can spread quietly across a large area of tile or laminate before a homeowner notices, and moisture trapped under flooring can grow mold quickly in Florida humidity.
Common causes
- Pipe corrosion
- Aging copper or galvanized lines
- Abrasion from pipe movement against concrete
- Soil movement or settling
- High water pressure
- Poor installation
Mistakes that make it worse
- Ignoring warm floor spots or a rising water bill.
- Repairing the flooring without fixing the leak.
- Assuming tile is fine because it looks dry. The subfloor and bottom of walls may be wet.
- Skipping insurance review. Some policies cover resulting damage but not the pipe access or repair.
What does slab leak damage cost in Florida?
A typical range is $2,000–$8,000 per job. Drying and cleanup only; leak detection and pipe repair are separate. Costs run higher in South Florida and the Keys and lower in parts of the Panhandle and the Heartland. For a range tailored to your city, open the cost calculator or see the cost table on your city page. For a deeper breakdown of what drives price, read how much water damage restoration costs in Florida.