What Is a Slab Leak? FL CONTEXT
A slab leak is a leak in the copper water supply or drain lines that run through or beneath the concrete foundation (slab) of your home. In Florida, virtually all homes built before 2000 on slab-on-grade foundations have copper supply lines running under the slab. Unlike states with basements, FL homes have no easy access to these pipes — repairs require cutting concrete or running new lines through walls and ceilings.
Why FL Homes Are at High Risk 6 FACTORS
01
Home Age
Homes built 1970–1995 with original copper — peak risk window in FL. These pipes are 30–55 years old.
02
Chloramine Damage
FL municipalities switched to chloramine disinfection (chlorine + ammonia). It pits copper from the inside 2–5× faster than chlorine alone.
03
Soil Movement
FL's sandy soil shifts with water table changes, especially near the coast. This creates stress fractures at buried pipe joints.
04
Hard Water
FL hard water (150–350 mg/L) deposits calcium inside copper pipes, restricting flow and increasing pressure stress at weak points.
05
High Water Pressure
FL homes on municipal water often run 80–100 PSI. FL code max is 80 PSI. High pressure accelerates pinhole formation.
06
Older Solder Joints
Pre-1985 copper used lead-tin solder at joints — these corrode faster than modern lead-free solder used today.
Repair Method Comparison
| Method | Cost | Invasiveness | Lifespan |
|---|
| Spot repair under slab | $1,500–4,500 | High (jack-hammer) | Temporary if pipes failing |
| Epoxy pipe lining (CIPP) | $3,000–8,000 | None | 35–50 years |
| Reroute above slab | $2,500–8,000 | Low (drywall only) | 50+ years (PEX) |
| Full under-slab repipe | $8,000–25,000+ | Very high | 50+ years (PEX) |
| Hydrostatic test only | $250–500 | None | Diagnostic only |
🔊 How Electronic Leak Detection Works
Licensed technicians use acoustic listening devices, thermal imaging, and pressure testing to locate the exact leak point before any demolition. This costs $250–500 and is ALWAYS worth it. Avoid plumbers who skip leak detection — digging in the wrong spot adds $500–1,500 to the job.
🏆 Why Above-Slab Rerouting is the #1 FL Solution
Most FL plumbers recommend rerouting over spot repair because: (1) It permanently removes corroding copper from service — no future slab leaks from those pipes. (2) New PEX is immune to chloramine damage. (3) Costs less than full under-slab repipe. (4) Only requires minor drywall patching, not concrete demolition. (5) Modern PEX carries a 25-year warranty vs. repaired copper that may leak again in 1–3 years.
8-Point Repair Decision Guide
- First-time single leak, pipes less than 25 years old → Spot repair is reasonable
- First-time leak, pipes 25+ years old or chloramine-era (post-1995) → Reroute strongly preferred
- Second leak in same home → Reroute or full repipe — more leaks are coming
- Multiple simultaneous pinhole leaks → Epoxy lining or full repipe depending on pipe condition
- Unknown leak location → Hydrostatic test first, THEN choose repair method
- Polybutylene ("gray PB") pipe under slab → Full repipe required — PB cannot be repaired
- High-value flooring (wood/marble) throughout home → Epoxy lining or reroute to avoid slab cutting
- Planning to sell in 2–5 years → Reroute or full repipe; buyers and inspectors flag unrepaired slab leaks
FL Homeowners Insurance Coverage WHAT'S COVERED?
| Item | Covered? | Notes |
|---|
| Plumbing repair under slab | ❌ No | "Wear and tear" exclusion — the repair itself is your cost |
| Mold remediation | ✅ Usually | If reported within 14 days — FL's mold reporting window |
| Flooring restoration | ✅ Usually | Tile, wood, carpet damaged by the water leak |
| Drywall / wall repair | ✅ Usually | Water damage to walls from the leak |
| Temporary housing | ⚠️ Check policy | Only if home is declared uninhabitable during repair |
| Second / recurring leaks | ⚠️ May be denied | Insurers can deny "maintenance failure" claims |
| Above-slab reroute labor | ❌ No | The repair itself is always excluded |
⚠️ FL Assignment of Benefits (AOB) Warning — FS 627.7152
FL FS 627.7152 governs AOB agreements. While you have the right to assign your insurance claim to a contractor, never sign an AOB under pressure or before getting your own independent estimate. FL courts have seen widespread AOB abuse over the past decade. An AOB assigns YOUR legal rights to the contractor — not just payment authorization. Read every clause before signing.
🍄 Post-Repair Mold Prevention
FL's humidity (avg 70–80% year-round) means any moisture event can lead to mold within 24–48 hours. After a slab leak: (1) Run dehumidifiers immediately. (2) Open walls if moisture meter readings are elevated. (3) Get a licensed mold inspection before closing any walls. (4) Document everything with timestamped photos for your insurance claim.
10-Step Slab Leak Response Checklist
0 of 10 complete
Shut off water at main shutoff immediately — stops active damage
Do NOT run hot water if the leak is on the hot side — keeps adding water to the slab
Document all damage with timestamped photos before any cleanup or repairs
Call your insurance company — open a claim BEFORE any repair begins (required in most FL policies)
Hire an independent electronic leak detection specialist — separate from the repair plumber
Get 2–3 written bids for the repair method — prices vary significantly
Ask each plumber: "Do you recommend spot repair or reroute, and why?"
Do NOT sign an AOB without reading all terms and consulting your adjuster
Request before/after pressure test documentation from your plumber
Schedule a licensed mold inspection if any wet drywall or flooring was exposed over 24 hours