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Question DetailsAsked on 1/4/2018

My 1st. floor bathroom ceiling vent fan is consistently leaking and is directly below the 2nd. floor bathroom. Help

We shut the toilet off for days and it still leaked. We stopped using the shower and it still leaked but a bit less frequently. The second floor bathroom vent is not leaking from the roof, just the first floor bathroom vent fan which is directly below the 2nd floor bathroom.

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1 Answer


Answer as very similar question here - though in your case, since on first floor, a roof leak is much less likely - though a leak at the roof jack (the seal around the duct where it exits the roof) could still be the cause, as could frosting of the vent pipe if you are having unusually cold weather.

On the frosting - if the drip gets worse when you run the fan for awhile (commonly not more than a few to maybe 5-15 minutes as it melts / evaporates the condensation but then tapers off to nothing or near nothing, it is almost certainly condensation/frosting in or on the outside of the ducting in cold attic or such that is the source.

Also on the condensation/frosting thing - where was I - oh yeah, each fan should have separate ducting through the roof (or wall in some cases), so might have different conditions there - longer exposure length in cold attic, one is insulated (individually or by attic insulation) and other is exposed, etc. Can also be due to leaking seal through the roof or damaged roof vent, so one could leak and the other not for that reason.

Because you say it leaked a bit less after not using the shower, could be just conincidental if the outside temp changed or you used the fan more (so evaporated out the condensation in the exhaust duct) - or could be you have a leaking shower valve. That you can iusually check out by removing the faucet handle (usually mounted with a setscrew, or with ball type like Peerless/Delta commonly by popping off a decorative logo cap which conceals a center screw), then undoing the couple of screws (sometimes just slide on) on the cover plate around the valve and pulling it off to look at the valve itself. (Cover plate is commonly caulked on to tile/enclosure, so you would have to be prepared to redo the caulk afterwards if you get into there).

If still leaks many hours or even days after last using shower, that would rule out a leaking shower base or pan.

Answered 2 years ago by LCD

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