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The Repipe Cast · Episode 04

Under the Concrete: Slab Leaks and the Repipe Decision

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A slab leak is a leak in the water supply lines that run beneath or inside a home's concrete foundation, and the decision it forces is simple to state and hard to make: repair this one leak, or replace the piping that produced it. The right answer depends on what your pipes are made of, how many leaks you have had, and what the water in Orlando and Central Florida has been doing to those lines for decades.

This guide explains why slab leaks are so common under Central Florida homes, the warning signs they give off, what a spot repair actually fixes, and when the smarter money goes to a whole home repipe in Orlando. Shamrock Plumbing has completed more than 80,000 repipes across Orlando and Central Florida since 2003, and most of them started exactly where you might be right now: with water showing up somewhere it should not be.

What Is a Slab Leak and Why Does Orlando Have So Many?

Most Orlando and Central Florida homes are built slab-on-grade: a concrete foundation poured directly on the ground, with the original water supply lines running beneath or through that concrete. When one of those lines develops a pinhole, the leak happens under your floors, where nobody can see it.

Two things make the region a slab leak factory. First, the era of construction: tens of thousands of area homes were plumbed with polybutylene or thin-wall copper that is now decades old. Second, the water itself: chlorinated, mineral-heavy municipal water works on pipe interiors year after year until the wall of the pipe gives somewhere. The concrete does not cause the leak. It just hides it.

What Are the Warning Signs of a Slab Leak?

Slab leaks announce themselves indirectly. Any one of these signs is worth a professional look, and two together are close to a confirmation:

• Warm spots on the floor. A hot water line leaking under the slab gently heats the concrete above it. A patch of tile or flooring that is always warm is the classic giveaway.
• The sound of running water with everything off. If you can hear water moving when every fixture and appliance is off, it is going somewhere it should not.
• An unexplained jump in your water bill. An under-slab leak runs around the clock, and the bill is often the first place it becomes visible.
• Moisture, cracks, or lifting in flooring. Water working up through the slab shows up as damp carpet, warped planks, loose tiles, or hairline floor cracks.
• A water meter that never stops. With everything off, the meter should sit still. If it keeps creeping, a hidden leak is feeding it.

Confirming the leak and pinpointing it under the concrete is its own discipline. Our leak detection service locates the failure without exploratory demolition, so the decision that follows starts from facts.

How Are Slab Leaks Repaired?

There are two honest ways to fix a single slab leak, and both have a place:

• Spot repair through or under the slab. The floor is opened at the leak, or a tunnel is dug beneath the foundation, and the failed section of pipe is repaired. It fixes the leak in front of you. It also disturbs the home the most, and it leaves every other foot of the same aging pipe in service.
• Rerouting the failed line. Instead of breaking concrete, the leaking run is abandoned in place and a new line is routed overhead through walls or attic space. Less disruption, and that one line is now new. The rest of the system is still the same age, in the same water.

Both approaches share one limitation: they treat a symptom. The pipe that failed was made of the same material, carrying the same water, for the same number of years as every other line under the house.

Should You Repair the Slab Leak or Repipe?

Here is the honest decision framework we use on real Orlando homes:

• A repair can make sense when it is your first leak, the rest of the system is newer copper or PEX in good condition, and nothing else is showing symptoms. Fix it, document it, move on.
• A repipe is the smarter money when this is your second slab or pinhole leak, when the home still has polybutylene or decades-old thin-wall copper, when pressure and water color are declining, or when your insurer is raising the plumbing at renewal. At that point each additional repair is money spent delaying a replacement that is already necessary.
• The math to run is not one repair vs one repipe. It is the series of repairs you are signing up for, each with its own access and restoration cost, against one permitted project that ends the cycle. Our guide to the cost to repipe a house in Orlando breaks down what sets the number, and our guide on how to choose a repipe company shows you what a complete quote must include.

How Does a Repipe End Slab Leaks for Good?

A modern whole home repipe does not tunnel through your slab. New PEX or copper lines are routed overhead through walls and attic space, and the old under-slab runs are abandoned in place, depressurized and harmless. The failure environment that produced your slab leak is simply no longer part of your plumbing.

Every Shamrock repipe is a permitted project: pressure tested before the walls close, passed by the county inspector, drywall repaired as part of the scope, and backed by our written workmanship warranty, with transparent upfront pricing and financing available. It is why more than 80,000 Orlando and Central Florida homes have ended their leak cycle with a repipe in Orlando by our crews since 2003.

Slab Leak Risk Check

How many pipe leaks has your home had in the past five years?

Slab and pinhole leaks that keep returning are the clearest sign a system is failing as a whole.

Two or more One None

Slab Leak Risk Check

What are your supply pipes made of?

Polybutylene and decades-old thin-wall copper are the materials behind most Central Florida slab leaks.

Polybutylene or old copper Not sure PEX or newer copper

Slab Leak Risk Check

When was your home built?

Central Florida homes built before the mid 1990s often still run their original under-slab supply lines.

Before 1995 1995 to 2005 After 2005

Slab Leak Risk Check

Any warm floor spots, water sounds, or a bill jump right now?

Active symptoms mean water is already moving where it should not be.

Yes, at least one Maybe, not certain No, all clear

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