Copper Slab Pinhole Leak Rerouted with PEX-A in Hacienda Heights

Slab pinhole leaks are sneaky. The pipe fails under the concrete, water starts pushing up or migrating through the structure, and by the time you notice the damage - like the ceiling staining you can see here - it's already been going on for a while. That's exactly the situation we were called out to handle in Hacienda Heights.

Here's what we were working with: a copper line buried in the slab had developed a pinhole leak. Rather than jackhammering through the concrete to patch a deteriorating pipe that would likely fail again, we took the smarter approach - rerouting the line entirely. We ran the new line up through the walls and across the ceiling to bypass the problem section completely. That keeps the slab untouched and gets rid of the compromised copper for good.

For the new route, we used PEX-A pipe with Viega PureFlow fittings. PEX-A is the most flexible grade of PEX available, which makes it much easier to work with in tight wall and ceiling cavities. Viega PureFlow fittings use an expansion connection method - meaning the fitting actually grips tighter over time as the pipe memory returns. No soldering, no corrosion risk, and a connection that's built to last.

The old corroded copper we pulled out tells the whole story. Heavy oxidation, green buildup, and a pipe that had clearly been under stress for years. Swapping that out for a clean PEX-A reroute is a night-and-day difference in long-term reliability. And because PEX doesn't corrode the way copper does, this repair isn't going to come back to haunt anyone.

Slab leaks don't fix themselves, and patching the slab without addressing the root cause is just delaying the problem. If you're seeing unexplained wet spots, water stains, or a water bill that's creeping up for no clear reason, that's worth looking into.