When a plumbing problem is under your foundation, reaching it is half the job. There are two main ways to get to pipe beneath a slab — tunneling from outside or accessing through the slab itself — and the right one depends on the situation.
The Two Approaches at a Glance
Tunneling means digging beneath the home from outside the foundation to reach the pipe from below, without cutting through the slab inside. Slab access means reaching the pipe by opening the slab directly from above.
Both are legitimate ways to reach under-slab plumbing. Neither is universally better — the right choice depends on where the problem is, what's above it, and what the repair requires.
Tunneling Beneath the Home
Tunneling is accessed from outside the foundation. The advantage is that it can reach the pipe from below without cutting through your slab or working inside the living space. It's often considered when the repair can be done from below and the layout allows it.
Tunneling is real excavation work — it takes a dig crew, and not every plumbing company has one. We run our own in-house dig crews, so there's no handoff.
Direct Slab Access
Slab access reaches the pipe through the slab itself. It's used when tunneling isn't the right fit — for example, when the problem is in a spot that's hard to reach from outside or when the repair needs direct access from above.
It involves opening and later restoring the slab, which is part of why it's a decision made after diagnosis, not before.
Why the Method Follows Diagnosis
You can't pick tunneling or slab access until you know exactly where the problem is and what fixing it requires. That's why we locate first — confirm the failure precisely — and then recommend how to reach it. Choosing a method before diagnosis is a guess, and a guess can mean the wrong cut or the wrong tunnel.
In Dallas–Fort Worth, we handle both approaches with our own crews, start to finish.
Diamondback Plumbing & Leak Locate — serving Dallas–Fort Worth and Ellis County.
