Quote:
Originally Posted by MoneyGuy
Water is leaking from our bathroom fan. I’m attempting to dry it out. My wife just had a shower and we’re running a portable humidifier constantly. I should know in a couple of hours if humidity is the problem but I don’t want to go onto an icy roof to check.
Thoughts?
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Quote:
Originally Posted by topfiverecords
Your problems are extreme cold, showers and gravity. Which one can you do away with?
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Great joke aside, building this out - it is likely just the built up moisture in the duct itself that is thawing out and dripping back down the pipe (assume you've got a sunny roof and asphalt shingles that has warmed your attic up above freezing).
Not uncommon and not a whole lot you can do about it. Insulating your ducts or replacing your ducts with a non-metallic material (PVC pipes, corrugated plastic) can help reduce the incidental build up slightly, but in the end, you're pumping highly moistened hot air our through a pipe that is -30 degrees. When you kill the fan there will be moisture on the sides that will still be condensed and refreeze. Rinse/repeat over a number of showers and there can be a decent amount of build up causing dripping when the attic warms.
Same concept as attic rain except here its just limited to your fan/exhaust and not the whole attic. Running the fan will help dry it out and prevent and puddles from stagnating too much.