Slab leak suspected: immediate action steps
- Perform the water meter valve test: turn off all fixtures and faucets, then check if the water meter is still spinning or the low-flow indicator is moving — if it is, you have an active plumbing leak somewhere in the system.
- Feel the floor for warm or hot spots — a hot water supply line slab leak creates a warm area on the floor surface, often circular or elongated along the pipe path.
- Call a licensed plumber for slab leak detection before calling a restoration company — electronic leak detection or acoustic detection will confirm the leak location and the affected pipe; the plumber's report is critical for your insurance claim.
- Call CFDR at 321-420-7274 — water damage restoration must be coordinated with the plumber's repair timeline; we can begin assessment and documentation while the plumber schedules the repair.
- Document the discovery date, the floor conditions you observed (warm spots, buckling tile, wet baseboards), and any water bill spikes — this timeline is your primary defense against a gradual-damage insurance denial.
- Do not replace flooring until the plumbing repair is complete and the slab moisture has dried to baseline — flooring installed over a wet slab will fail within weeks and creates mold conditions in the flooring adhesive layer.
- Check your homeowners policy for the gradual damage exclusion language — Florida insurers apply this aggressively to slab leak claims; having your insurance agent review the policy before filing is advisable.
Slab leak.
The damage starts beneath your floor.
Most Florida homes are slab-on-grade with plumbing under the concrete. When that plumbing leaks, the water damages your flooring, walls, and structure before it's ever visible. Here's how to detect it, what it damages, and what insurance covers.
7 signs of a slab leak in a Florida home.
- Unexplained water bill spike
Supply line leaks run 24/7 — 50–200+ gallons/day depending on pressure and line size
- Warm or hot spot on floor
Hot water line leak creates a thermal spot on the slab surface — noticeable in tile or hardwood areas
- Sound of running water with fixtures off
Active supply line leak produces audible water movement under the floor
- Cracking or buckling floor tiles
Hydrostatic pressure from water under the slab fractures tile grout joints and causes tile to lift
- Wet or soft baseboard drywall
Water wicks from slab laterally to the wall perimeter and up into drywall at the floor line
- Musty odor at floor level
Mold growing in flooring adhesive and at the wall-floor junction — smell is strongest when HVAC runs
- Water meter spinning with all valves closed
Valve test: close main shutoff, check if meter still moves — confirms active system leak
Three ways to repair a slab leak.
Core-drill or jackhammer slab at the leak point; repair or splice the pipe; repatch concrete. Least invasive. Limited floor disruption. Best when the leak is localized to a single known point.
Abandon the leaking pipe in the slab; run new line through wall cavities above the slab. No slab demolition. May require wall access and drywall repairs. Best for recurring copper pitting issues.
Internal rehabilitation of pipe without excavation. Limited to drain lines. Not applicable to all pipe sizes. Best for drain line issues where excavation would be extensive.
Slab leak water damage explained.
What is a slab leak and how do I know if I have one?+
A slab leak is a leak in a plumbing supply or drain line that runs under or through the concrete foundation slab of a home. Florida has a high concentration of slab-on-grade construction — most homes built in Central Florida sit on a concrete slab with plumbing embedded in or under the concrete. Signs of a slab leak: (1) Unexplained spike in water bill without visible leaks — supply line slab leaks run continuously; (2) Warm or hot spot on the floor — indicates a hot water line leak; (3) Sound of running water when all fixtures are off; (4) Cracked or buckling floor tiles — hydrostatic pressure from water under the slab; (5) Wet baseboards or walls on the floor level — moisture wicking up from the slab through the flooring and wall base; (6) Mold smell at floor level with no visible leak source; (7) Water meter spinning with all fixtures off (valve test).
Does homeowners insurance cover slab leak damage in Florida?+
Florida homeowners insurance generally covers the resulting water damage from a slab leak — but typically does not cover the slab leak repair itself (the plumber's cost to locate and repair the pipe). Coverage A (dwelling) covers the damage to flooring, drywall, and structure caused by the slab leak water. However, the gradual damage exclusion is frequently applied: if the insurer argues the leak was slow and ongoing rather than sudden, they may deny all or part of the claim. Florida has seen significant litigation over slab leak claims. A slab leak discovered through a sudden event (tile suddenly buckling, visible water) is more defensible than one discovered after months of elevated water bills. Documentation of the first date of discovery is critical. The plumber's leak detection report identifying the pipe failure point and cause is key evidence.
What does slab leak repair involve and how long does it take?+
Slab leak repair has two phases: plumbing repair and water damage restoration. Plumbing repair options: (1) Spot repair — excavate the concrete slab at the leak point, repair or replace the specific section; typical cost $1,500–$4,000; disturbs a limited floor area; (2) Reroute — abandon the leaking pipe and run new supply line through the wall framing above the slab; typical cost $2,000–$5,000; no slab demolition but may require wall access; (3) Epoxy pipe lining — internal pipe rehabilitation without excavation; limited applicability but less invasive. Water damage restoration follows plumbing repair: flooring removal and replacement (tile, laminate, or hardwood — the whole room typically must match), drywall base repair, subfloor assessment, structural drying. Total timeline: 2–4 weeks for repair + 1–2 weeks for restoration work.
How much water damage can a slab leak cause in Florida?+
A supply line slab leak can discharge 50–200+ gallons of water per day depending on water pressure and line size. Water under the slab finds paths of least resistance: it wicks up through the concrete, through flooring adhesive, into the flooring material above, and migrates laterally along the slab surface to the wall perimeters where it wicks into drywall bases. In a typical Central Florida home, an undetected slab leak running for 2–4 weeks can saturate the flooring in the entire affected area, rot the OSB subfloor (if present between slab and flooring in elevated sections), create extensive mold at the wall-floor junction throughout the affected zone, and in severe cases, cause cracking or heaving of the slab itself due to soil erosion from the leaking water.
What is the most common type of slab leak in Florida homes?+
In Central Florida, the most common slab leak is in copper supply lines. Florida's water chemistry — particularly the chloramine disinfectants used by Orlando Utilities Commission and other water suppliers — attacks copper pipe from the inside through a process called pitting corrosion. This is not a failure of the original pipe quality — it is a chemical interaction between the treated water and the copper over 20–40 years. Pinhole leaks in copper slab lines are endemic in Florida homes built from the 1960s through the 1990s. Homes in this age range with original plumbing have a high probability of slab leak occurrence. A single pinhole can run for months — slowly damaging the slab area — before producing enough surface evidence to be noticed.
Slab leak confirmed? Water damage restoration coordinated with your plumber — documentation ready for insurance.
Ryan coordinates with the plumber and begins assessment immediately. Discovery date documentation and Xactimate scope for the gradual-damage question.