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  1. #1
    Join Date
    Feb 2014
    Posts
    1

    Default Attached Garage condensation

    Hi, I live in Minnesota and I have a double door garage that is attached to the house. 2 years ago I hired a contractor to mud and tape the garage as well as paint it, I also replaced the garage door. Since than I have noticed during the winter months that I have terrible condensation problems, looks like a rain forest! I know the exterior door and window needs replacing also but I did not have this problem before. Any reasons why? What can I do to rectify this problem. Thanks.

  2. #2
    Join Date
    Jan 2014
    Location
    NH
    Posts
    54

    Default Re: Attached Garage condensation

    Hi, Was a plastic vapor barrier installed at the same time? Thanks

  3. #3
    Join Date
    Dec 2013
    Location
    New Hampshire
    Posts
    27

    Default Re: Attached Garage condensation

    My guess is that you somehow managed to get the exterior walls and doors of the garage more tightly sealed than the adjoining wall to the house. Water vapor flows from the house to the the cold garage where it is trapped and condenses on the coldest surfaces.

    Make sure the door into the house and adjoining wall to the house is well sealed. Or adjust the weatherstripping on the overhead door for a looser fit. Or insulate the doors, windows etc. and keep the garage heated.

  4. #4
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,360

    Default Re: Attached Garage condensation

    The cold air is condensing on the warm surface. Is the insulation properly installed with vapor barrier before they drywall was installed?

  5. #5
    Join Date
    Dec 2013
    Location
    Montreal Canada
    Posts
    93

    Default Re: Attached Garage condensation

    Quote Originally Posted by HoustonRemodeler View Post
    The cold air is condensing on the warm surface. Is the insulation properly installed with vapor barrier before they drywall was installed?
    Cold air can not condense on a warm surface. warm air however can condense on a cold surface.

  6. #6
    Join Date
    Aug 2007
    Location
    Portland, Oregon, formerly of Chicago
    Posts
    1,583

    Default Re: Attached Garage condensation

    Minneasota can be very cold. Those walls are really cold at times. I assume you park in your garage and often bring in a lot of slush frozen to the underside of the car. The car in the moment you enter the garage has a lot of stored up heat energy from the engine and exhaust. This raises the temperature of the garage temporarily. The slush melts creating lots of moisture which then hits the very cold walls.

    Are your walls actually insulated, or just drywalled? Builders often don't insulate the garages, but hang drywall for aesthetics and fire purposes. The common wall to the house must be totally drywalled according to building code. The ceiling too if the attic continues over the living space.

    What to do: Insulate the walls if they are not. Raise the temperature in the garage. Keep air moving in the garage. Don't bring your car into the garage in winter when the bottom is covered with slush.

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