Plumbing Notes/slab leaks
Slab leak repair — re-route in PEX-A
When copper fails under an Inland Empire slab, we don't jackhammer the floor chasing it. We abandon the bad line and run a fresh PEX-A re-route through the walls and attic.
By Brad Staiger — Staiger Plumbing, LIC. #802197
The call we get most
A homeowner in an older Norco tract calls because a hot-water spot has shown up on the hallway tile and the water bill jumped. We run pressure-decay and acoustic detection, find the leak on a copper supply line that crosses under the slab, and the conversation turns to how we fix it. This is the bread-and-butter call for Brad's crew. Riverside and San Bernardino county homes built from the 50s through the late 80s almost all have copper run under the concrete, and 40-plus years in expansive clay is hard on it. The clay swells and shrinks with every wet and dry season, the pipe shifts, and Inland Empire water hardness corrodes it from the inside at the same time. Once the first pinhole opens on a line, the rest of that run is usually close behind.
What we find under the concrete
Detection tells us where the leak is, but it also tells us the story of the whole system. When we open an access point to confirm, the copper coming out is the same picture every time: green corrosion crusted along the pipe, thin walls, and on drain-side jobs an old cast iron elbow or hub sitting in the soil with the metal flaking off. On a commercial bathroom drain replacement we did recently, the slab cut showed the ABS and PVC stub-outs we were tying into right next to the failing original copper supply. That contrast is the point. The old metal has aged out. Dropping a patch on one pinhole in a Fontana or Hemet home built in 1984 means we are back in six months for the next one on the same line, and the homeowner pays twice.
Why we re-route instead of cut
Here is the part that surprises people. We do not tunnel under the slab or saw-cut the floor to chase a supply leak. Jackhammering a slab in expansive Chino Hills or Norco clay disturbs the soil that is already moving the house around, and it leaves you with a patched floor over a pipe that is the same age as the one that just failed. Instead we abandon the leaking line and run a new water supply in PEX-A through the walls and overhead through the attic. PEX-A flexes with the basin's seasonal ground movement, it does not corrode in hard water the way copper does, and there are no buried fittings sitting in wet clay waiting to fail. The slab stays intact. For a single line in a tight spot we will sleeve it in-wall, but the re-route is the repair that lasts.
What the repair looks like
Most single-line slab leak re-routes are a one-day job. We isolate the failed run, set the new PEX-A path through walls and attic, tie it back into the fixtures, and pressure-test the whole thing before we close anything up. Drywall gets cut clean at the access points and patched. A full re-pipe, where the whole house is on aged copper and we move all of it to PEX-A, runs longer but follows the same logic. We never put copper back in. Leak detection is free and comes with a written estimate, the estimate is same-day, and every slab leak repair we do carries a lifetime warranty. That warranty is the tell. We only stand behind it because the re-route takes the failure point out of the equation instead of patching around it.
What this means for your house
If your Inland Empire home was built before 1990 and you are seeing a warm patch on the floor, a meter that creeps with everything shut off, or a second pinhole on the same line inside two years, the under-slab copper has reached the end of its run. The age of the house narrows the odds but the clay out here moves regardless, so we have pulled slab leaks out of 2005 builds in Menifee and Canyon Lake too. The fix is not a hole in your floor. It is a fresh PEX-A line routed around the problem, tested, and warrantied for as long as you own the home. Catching it early keeps a leak from turning into mold and foundation damage, so the meter check is worth the two minutes.
Related notes
- Signs of a Slab Leak — How to Catch It Before the Damage
A slab leak rarely shows itself right away. Here is what Inland Empire homeowners notice first, why local copper fails early, and what our crew checks on a free diagnostic call.
- Why Catching a Leak Early Saves Tens of Thousands
A pinhole we catch this week runs a couple hundred dollars. The same leak found six months later, after it has soaked the slab, is a completely different number. Here is how that math works.
- How We Find a Slab Leak Without Tearing Up Your House
Brad's crew finds a slab leak with pressure testing, acoustic gear, and thermal imaging before any concrete gets touched. Here is the order we work in and what detection costs you.