Sewer Line Replacement Under the Slab for Back-to-Back Bathrooms

When two bathrooms share a wall, their drain lines are usually tied together under the slab. It's an efficient layout - until something goes wrong. Old pipe, root intrusion, or years of buildup can turn a shared drain system into a shared problem real fast.

Here's what we were working with: failed sewer lines running beneath the foundation between back-to-back bathrooms. The only real fix was breaking through the slab, pulling the old line, and running new pipe the right way. No shortcuts, no patch jobs.

That's the kind of work most people never think about until they have slow drains, sewage odors, or water showing up where it shouldn't. By the time those signs show up, the damage is usually already done. Getting ahead of it - or catching it early - makes a big difference in what the repair actually involves.

We cut the slab, excavated down to the problem, and ran new PVC drain lines to serve both bathrooms properly. Everything got tied back in with the correct slope and connections so water and waste move the way they're supposed to. Clean work, done right.

This is exactly the kind of job that sits at the intersection of slab leak detection and serious plumbing repair. Not every plumber is comfortable working under a foundation. We do it regularly, and we take it seriously every time.