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Question DetailsAsked on 9/22/2011

How can I find the source of moisture under vinyl flooring on an outside wall in bathrm? The toilet is not the source. Problem still exists

Problem was thought to be related to a toilet not set down properly. New flooring installed; new toilet installed; moisture now forming in same spot AND add'tl. spots.No water on surface. Cameras showed sewer lines were clear; no apparent breaks.

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2 Answers


Before the source of the water intrusion can be identified, is it known whether the presence of water is constant or periodic? If water is always present, the likely source is a plumbing leak from a water line in a wall or from a plumbing fixture in an upstairs bath. Water from a leaking toilet or water line can migrate behind walls and come to rest at a point some distance from its source.

If the presence of water is periodic, the source may be weather-retlated --particularly since the bathroom is on an outside wall. Is there evidence of water only after a rain storm? If so, then check around and below the bathroom window. The flashing may be leaking or the weep holes in the window frame may be blocked. If such is the case, water will penetrate into the wall and come to rest on the sub-floor beneath the finish floor.

If there is a bathroom stacked above the subject bathroom, the water source may be related to a leak in of its fixtures. Check the stops under the vanity sink, the toilet, shower and tub. Does the leak materialize only when someone is taking a shower or draining the bathtub. If so, one of them may be the source.

Remember, water often migrates a good distance before it makes itself evident and may come from a source that is obscured by walls or cabinets. Check for wet drywall and wet cabinet bottoms. Good luck.

Answered 9 years ago by Larry


I would pull the baseboard off of the wall in the area where you have the water problem. If the drywall at the bottom of the wall behind that baseboard is moist or is crumbling due to water problems, then the water source is likely inside of that wall. The source of that water could come from one of several different sources. It could come from a leaky pipe inside of that wall or from a plumbing fixture upstairs. It could come from an exterior wall leak or from a roof leak.

Source: J. G. Hamm Construction - Ypsilanti, Michigan

Answered 9 years ago by JGHamm

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