Water spot on ceiling caused by toilet?

Old 07-23-01, 05:20 AM
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I recently noticed what appears to be a water spot on a downstairs ceiling. The sheetrock is damp but there is no visible water or leak upon closer inspection of the area. The toilet in the upstairs bedroom is located just above the water spot. The carpet around the upstairs toilet is NOT wet. Where do I begin to search for this apparent leak?
Old 07-23-01, 05:57 AM
Mike Swearingen's Avatar
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A bathroom leak on a ceiling below it can be difficult to find because of the many possible sources.
It could be from a supply line, a drain, or simply from excessive water on the bathroom floor from shower or tub use. And, of course, the spot may not be directly under the leak source.
To eliminate water supply lines, you can make certain that all in the house are OFF, and check the water meter. It will have a small dial or triangle that spins rapidly when water is ON, slowly when there is a supply line leak, and won't move at all if there is no leak.
To eliminate the toilet, observe it over time to see if the water inlet valve comes on although it hasn't been flushed. If it is leaking around the wax seal under it, that can be a good indicator, but will be intermittant.
If the spot seems to get wetter when the tub or shower is in use, it could be that drain or the excess water on the floor. A shower or tub drain may not leak unless there is weight in the shower or tub.
The vanity sink may leak when in use.
It is a process of elimination.
Good Luck!


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