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Plumbing · Colorado
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Slab Leak

A leak trapped under concrete keeps running until it is found, and it will wash out the soil supporting the slab long before anything appears on the floor.

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When this becomes an emergency

What a pro does

Confirming the leak is really under the slab is where this starts, since a line inside an interior wall can produce very similar signs. The plumber isolates sections of the system and watches for pressure loss, then narrows the position with acoustic listening and line tracing so nothing gets cut on a guess. Colorado adds a complication most regions don't have. Slab-on-grade construction sits on expansive clay across much of the Front Range and the eastern plains, and that soil heaves as its moisture content changes, so a slab here is already under stress before a leak adds water to the equation. A leak feeds that cycle directly. Water escaping under the pour swells the clay in one spot and pushes the concrete unevenly, which is why the cracks that show up often run in a line rather than scattering. Radiant floor systems come into it too, common in newer mountain builds and easy to confuse with a supply leak. Once the location is confirmed the decision is between a targeted opening in the slab and rerouting the run overhead so the buried section can be abandoned.

Frequently asked questions

Because the water changes the ground itself. Clay that takes on moisture swells with real force, and it does that where the leak is rather than uniformly. The slab gets lifted at one point, and the movement can do more damage to the structure than the water alone would.
Locating it, yes. Pressure isolation, listening equipment and line tracing narrow it to a small area before anything is opened, and sometimes what follows is a decision to reroute the line rather than cut the floor at all.
Not in a house with radiant heat in the slab, which is common enough in newer builds here to be worth ruling out first. A plumber checks whether there's a heating loop where the warmth is before treating it as a hot water line letting go.
Wear from both sides. Water chemistry thins the tubing from within over years, while contact with concrete and soil works on the outside. Movement in the ground abrades it further. Eventually pressure finds the thinnest point and opens a pinhole.

Slab Leak?

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