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Question DetailsAsked on 7/22/2015

I have a small leak that is in my bathroom and the adjacent wall in the garage. Checked washer and water heater

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If you can't find a leak at or under fixtures (including especially the overpressure relief valve on the water heater), then probably a leaking water or sewer pipe in the wall between these two rooms. You can have a plumber do it, or find it yourself either by opening up holes in the wall (start at the wet spot on floor about a foot above floor so you can look (with a small hand mirror) and reach both down and up in the opening, or use a fiber optic inspection scope/camera to inspect for the source by drilling about a 1/2" hole in the wall (probably on garage side) to look inside the wall, then track up to the top of the wet zone (unless spraying, in which case wetness may reach above the leak point).

Depending on how small a leak, you may be able to detect it (after turning off all noise sources in house) using a stethoscope - I have found water line leaks that way which were so small they were not spreading - evaporating from the wall as fast as the water came mout, just a very tiny mist or slow drip. Of course, sewer pipe leaks (rarer) come with sound only if the water is dripping off the pipe and hitting somewhere lower down, so tougher to track that way.

Answered 4 years ago by LCD

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