Leak Detection Guide
A slab leak is a leak in a water supply or drain line that runs underneath your home's concrete foundation. Because the pipe is inaccessible without breaking through concrete, slab leaks are identified with non-invasive methods — acoustic listening and thermal imaging — rather than simply looking for the problem.
A foundation crack is a structural fracture in the concrete slab or footing itself, caused by soil movement, settling, or in some cases, sustained water exposure. Foundation cracks are a structural engineering concern first, not a plumbing one, even though the two can end up connected.
Warm or damp floor spots, an unexplained water bill increase, the sound of running water with everything off, and mold or musty smells all point toward a slab leak rather than a purely structural issue — these are all water-related symptoms that a structural crack alone wouldn't produce.
Cracks that appear in a stair-step pattern along masonry, doors or windows that suddenly stick or won't close properly, and visibly uneven or sloping floors point toward foundation movement rather than a plumbing leak, particularly when none of the water-related symptoms above are present.
A slab leak left unaddressed can erode the soil supporting the foundation, and that soil loss can eventually lead to real structural settling and cracking. This is exactly why catching a slab leak early matters beyond just the water bill — it's also preventing a much larger structural repair down the line.
If your symptoms point toward water — damp spots, high bills, running-water sounds — a leak detection specialist is the right first call, since finding and fixing the leak is the actual issue. If your symptoms point toward structure — cracking without water signs, doors sticking, uneven floors — a structural engineer's assessment should come first.
