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Finding It Without Opening the Floor
Locating the leak and repairing it are two separate jobs, and the first should be finished before the second starts.
In one paragraph
Acoustic listening, tracer gas, thermal imaging and pressure isolation each settle something different. Listening locates a pressurized leak; tracer gas finds one too quiet to hear; thermal imaging follows a hot line; isolation establishes which side of the system is losing water.
The methods
| Method | What it does | Where it struggles |
|---|---|---|
| Pressure isolation | Proves which line is losing — hot, cold, or neither | Says nothing about where along it |
| Acoustic listening | Hears escaping water through the slab | Noisy houses, thick slabs, very small leaks |
| Tracer gas | Introduces a gas that rises through concrete where the pipe is open | Needs the system drained; slower |
| Thermal imaging | Shows a hot-side leak as a warm plume | Cold-side leaks; heated floors |
Most locations use two of these together, because each answers a different question and one alone leaves a guess in the middle.
The question worth asking
How confident are you in the location, and what happens if it is wrong?
That is not a hostile question. Opening a slab in the wrong place costs somebody, and whether it costs you should be settled out loud before the first cut rather than afterwards.
Ask also for the isolation result — hot or cold — because it is the simplest step in the whole diagnosis and it constrains everything that follows.
Before anyone cuts
Establish what kind of slab you have. That is a question for the builder, the original plans, a structural engineer, or your local building department, and it belongs before the repair method is chosen rather than after.
Read next
If the meter moved with everything off, you have a leak.That is the finding worth leading with, because it saves an hour of diagnosis. We connect you with a contractor who covers your area, and your ZIP code is what decides who that is. You are never charged. It does not have to be a slab leak either — every kind of plumbing request is routed.
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