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UNDER THE CONCRETE
Slab Leak Detection & Repair in Gilbert, AZ
A warm spot on the floor, a hot-water pressure drop, or the sound of water under the slab. We locate the leak precisely and talk through the real repair choices before anyone breaks concrete.
- Licensed and insured Arizona plumbers
- Straight to a plumber, no forms
- Emergencies answered 24 hours
A slab leak is a leak in a water line that runs under or through the concrete foundation. Almost every Gilbert home is built slab-on-grade, so the supply lines that feed the house run in or beneath that slab, and when one develops a pinhole the water has to go somewhere: up through the floor covering, or sideways into the soil under the house.
These are worth taking seriously and worth getting right the first time. The wrong approach is to break the slab in the wrong place, or to spot-repair a pipe that is going to leak again a foot away. We locate the exact spot, then lay out whether a targeted repair, a reroute, or a section of repipe is the honest call.
How to tell a slab leak from something else
The most common Gilbert tell is a warm patch on a tile or wood floor, because most slab leaks that get noticed are on the hot-water line. Alongside that, people notice hot-water pressure dropping, a water heater that seems to run constantly, or the meter moving with the whole house shut off. Sometimes the first sign is a hairline crack in the floor or a section of baseboard that stays damp.
Why the hot side leaks first
Hot water is more aggressive on copper than cold, so the hot-side slab line tends to fail before the cold. That is useful for detection, because a warm floor and a hot-water pressure loss together point strongly at a hot-side slab leak rather than an appliance or a fixture.
Need a plumber out to Gilbert today?
Skip the rest of this page and call. We answer 24 hours for anything urgent.
Call (480) 806-2944Repair, reroute, or repipe
| Approach | When it fits | Trade-off |
|---|---|---|
| Spot repair | One isolated leak, easy access | Cheapest now; nearby pipe may fail later |
| Reroute above slab | Hot line with a bad history | Avoids breaking concrete; visible pipe in wall or attic |
| Partial or full repipe | Repeated pinholes across the house | Most disruptive; ends the pattern for good |
There is no single right answer. A first leak in an otherwise healthy system is often a clean spot repair. A hot line that has now leaked twice is usually better rerouted through the wall and attic so it is out of the slab entirely. A house that keeps springing pinholes is telling you the whole copper system has aged out, which is the repiping conversation.
What a slab leak is not worth doing
Avoid these shortcuts:
- Breaking the slab before the leak is pinpointed to a spot
- Ignoring a warm floor because the pressure still seems fine
- Patching a hot line that has already failed once in the same run
- Running the water heater harder to mask a pressure drop
Gilbert questions about slab leak detection & repair
Is a slab leak an emergency?
It is urgent but usually not a burst-pipe emergency. The water is escaping under the house rather than flooding a room, so you have time to detect and plan the repair properly. It should not be left for months, though, because it wastes water and can undermine the soil and the slab over time.
Do you always have to break the concrete?
No, and often we recommend not to. Rerouting the affected line above the slab, through a wall and the attic, avoids jackhammering the floor entirely and is frequently the better long-term fix for a hot-side leak. Breaking the slab makes sense mainly for a single, well-located leak with easy access.
How do you find the exact spot?
With
: pressure isolation to confirm the line, then acoustic listening and thermal imaging to narrow it to a point. Precise location is what keeps the repair small instead of exploratory.
Could this turn into a whole repipe?
It can, and we will tell you honestly if it should. A single slab leak is a repair. A pattern of them across a Gilbert home built in the same era usually means
will cost less over time than chasing leaks one at a time.
Related work under and around the slab
Slab leaks sit at the center of several Gilbert plumbing problems. They start as a job for leak detection, can end as a repipe when they keep recurring, and if one runs undetected they feed straight into water damage restoration. A slab leak also stresses the water heater, which works overtime against the constant loss. We handle slab leaks across Gilbert and the older slab-and-galvanized housing over in Tempe Junction.
Warm floor or a mystery hot-water pressure drop?
Get the slab leak pinpointed before you break anything. Call and we will walk through the options.