Moisture inside bathroom wall.


Old 08-04-13, 07:03 PM
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Moisture inside bathroom wall.

In March I opened up the top ½ of an interior wall (16” x 36”) behind a shower to replace a valve. When valve install was completed the wall cavity smelled musty so I kept it open for a few weeks – I assumed water got in there when the pipes were cut. The musty smell did not go away. I purchased the “DampRid” calcium chloride product to absorb and capture the moisture. The product was lowered into the wall cavity in April and hung from a string to check it weekly. It fills with the moisture it has absorbed and, at the end of 30-40 days, I replace it. After four months the wall cavity is still releasing moisture. And - the amount of water collected in the first period was 38 oz, 2nd period was 34 oz.

The shower has not been used since the valve was changed – 4 months. The shower valve does not leak. Possibly the sink drain line has a leak and crosses under the shower pan (there is no way to see the pipes without opening a block wall.) I stopped using the bathroom sink 3 weeks ago to see if the problem could be solved.

The next step might be to send a camera into the 1.5” drain line. Has anyone encountered a problem like this? Any suggestions?

Last edited by BGC; 08-04-13 at 07:47 PM.
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Old 08-05-13, 08:46 PM
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Is it a first floor shower? If so, what's below it?
Old 08-06-13, 05:53 AM
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Been on the roof to check if the rubber seal is not rotted out where the vent goes through the roof?
If you only opened up the top of the wall how do you know the valves not leaking?
Got some pictures?
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