UNDER THE SLAB
Slab Leak Detection & Repair in Tempe, AZ
Copper cast into the concrete, a pinhole spraying where you cannot see it. We locate it exactly, then fix it or route it out of the slab for good.
- Licensed and insured
- Diagnosed and quoted first
- Answered 24 hours
A slab leak is a leak in a water line that runs within or beneath the concrete foundation. In Tempe that describes a very large share of homes, because Valley builders have poured slab-on-grade foundations for decades and run copper supply lines through them. When one of those lines fails, the water has nowhere obvious to go, so it works through the slab and into the house.
The good news is that a slab leak is almost always fixable without replacing the whole foundation. The decision that matters is how to fix it: open the concrete for a spot repair, or abandon the failed run and reroute it overhead. Both are legitimate, and the right call depends on the pipe's age and how many times it has already failed.
How a slab leak repair actually goes
Confirm and locate
We verify the leak is under the slab, not a fixture, then pin it to a small area with acoustic and thermal equipment so nothing is opened on a guess.
Choose the approach
A single, first-time pinhole in otherwise sound copper is often a clean spot repair. A line that has failed before, or old thin-walled copper, usually earns a reroute instead.
Repair or reroute
A spot repair opens a small section of slab, replaces the damaged pipe and closes it up. A reroute abandons the slab run and carries a fresh line overhead through the attic and walls.
Dry and restore
If the leak ran for a while, drying the slab and sub-base comes next, because caliche traps that moisture and holds it long after the pipe is fixed.
Spot repair or reroute: the honest trade-off
A spot repair is cheaper today and disturbs less of the house, and for a young pipe with one clean failure it is the sensible choice. But if the copper is old and corroding from very hard water, fixing one pinhole often just means waiting for the next one a few feet away. In that case an overhead reroute, and sometimes a full repipe, ends the cycle instead of extending it. We lay out both costs so you are choosing, not being sold.
Why the slab gets blamed but the water is the cause
Homeowners often think the concrete crushed the pipe. Usually it is the other way around. Very hard Tempe water corrodes copper from the inside over decades, and the caliche under the slab flexes with each wet-dry cycle, so the thinned pipe finally splits at a stress point. Understanding that is why we look at the whole supply system's age, not just the one hole, before recommending a fix.
Working around a family still living in the house
Most slab repairs happen in an occupied home, so how the work is staged matters as much as the fix itself. We keep the water on for as much of the job as possible, isolate only the section being worked on, and plan access points to disturb the least amount of tile and flooring. Where a reroute is the right call, the overhead run is done in stages rather than opening the whole house at once. And because the caliche under the slab holds moisture, if the leak ran for a while we build in time to dry the sub-base properly before closing anything up, rather than sealing damp material back under the floor. The result is a repair that fits around normal life instead of turning the house into a construction site for a week.
Every slab repair starts with confident leak detection, and if the source is a section that keeps failing we move the conversation to a whole-house repipe. When a slab leak has soaked the surrounding materials, our water damage restoration crew handles the dry-out so the fix does not leave a mold problem behind.
Questions
Slab Leak Detection & Repair questions
Do you have to jackhammer my floor?
Not always. A spot repair does open a small section of slab, but many hot-water slab leaks are better solved by rerouting that line overhead, which leaves the floor intact. We recommend the approach that fits the pipe's condition, not the one that sounds most dramatic.
Will one repair fix it, or will another leak follow?
If the copper is young and the failure was a one-off, a spot repair usually holds. If the pipe is old and corroding on this hard water, a single fix often buys a year or two before the next pinhole. That is the moment to weigh a reroute or repipe honestly.
How did the leak get under the concrete in the first place?
The supply lines were poured into the slab when the home was built, standard for Valley construction. Decades of very hard water thinning the copper, plus caliche shifting under the foundation, eventually opens a pinhole. It is a slow failure that surfaces suddenly.
Is the foundation itself damaged?
A slab leak damages the pipe and can saturate the soil under the foundation, but it is a plumbing failure, not a structural one by default. If saturation has caused movement, that is a separate structural assessment; we stop the leak and dry the slab, and say so plainly if we think a structural engineer should look.
Need a plumber in Tempe?
Call and describe the problem. You will reach a plumber who diagnoses and quotes before any work starts.