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  1. #1
    Join Date
    Dec 2009
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    2

    Question Bathroom exhaust fan drips water

    We have a bathroom exhaust fan that condensates or drips water. The hose for the fan goes to the roof through our attic. Any ideas on what would cause this to happen?

  2. #2
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: Bathroom exhaust fan drips water

    Hi, It can be can just be condensation... Is there a vent stack pipe cap on the pie that sticks out threw the roof? Is the vent exhaust pipe insulated?
    Years ago in Colorado i simply installed a longer exhaust pipe and looped it in the attic= no more drip as it was simple condensation...

  3. #3
    Join Date
    Dec 2009
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    2

    Default Re: Bathroom exhaust fan drips water

    Thanks for your reply. And no it is not insulated. We will give it a try.

    Thanks Janet

  4. #4
    Join Date
    Dec 2009
    Location
    Casper, Wyoming
    Posts
    159

    Default Re: Bathroom exhaust fan drips water

    Installing some flexible duct material will help stop the condensation. The change in temperature between the bathroom and attic-roof is probably causing the condensation. They sell it at all the big box home improvement stores.

  5. #5
    Join Date
    Jan 2010
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    3

    Default Re: Bathroom exhaust fan drips water

    Warm air with some humidity will be rising through the vent pipe all the time, when the fan is off too.
    Is your home unusually humid during the winter -- humidifier going, lots of boiling style cooking, etc. (?)

  6. #6
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Bathroom exhaust fan drips water

    Quote Originally Posted by Marcy Tate View Post
    Installing some flexible duct material will help stop the condensation. The change in temperature between the bathroom and attic-roof is probably causing the condensation. They sell it at all the big box home improvement stores.
    I suggest if you are posting to try and promote your internet service you should get your information correct.

    For all we know that could mean the crappy white plastic flex duct that many folks already use.

    A bath exhaust fan when used during showers is blowing out warm 100% humidity up through the ducting in the attic and out the roof.

    When the attic is cool or freezing cold that humidty is condensing and may be freezing inside the ducting --- regardless of the ducting --- metal or the white plastic flex --- if it isn't insulated .

    Consider when the duct is vented out the roof it's running vertically ---- more or less straight up ---- so any water from the condensation will run back down and drip from the fan.

    The duct should be insulated along the entire run in the attic to minimize the warm humid air being exhausted to condense.

    As also mentioned earlier---- when the fan is not being used warm air may escape up the exhaust fan duct and also condense. One way to minimize this is to check the backdraft damper is present and functioning ---- ideally a spring loaded type is best.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  7. #7
    Join Date
    Feb 2010
    Posts
    1

    Default Re: Bathroom exhaust fan drips water

    I just want to ask if the bathroom's in-wall exhaust fan exhausting directly through wall? If that happens, I would recommend that you should check the attic and see what is really happening. If water isn't evident on the exterior of the vent pipe, then it isn't the flashing. Bathroom Fan
    Last edited by lauretta07; 02-23-2010 at 01:30 AM.

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