Attic is an unvented box

Discussion in 'Roofing and Siding' started by Soparklion, Sep 3, 2013.

  1. Sep 3, 2013 #1

    Soparklion

    Soparklion

    Soparklion

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    I recently purchased a two story home with a pitched slate roof. There is NO soffit or other ventilation to the attic.

    How should I ventilate it? I plan to place a gable vent on one end with a gable fan in the other end, but I have no idea how to size them. I've heard 1 cu ft/min per 150 sqft of roof space, which in my case is ~600 sq ft. How do I size the passive gable vent? Given that it is a slate roof, I don't plan to poke holes and add roof vents.

    All replies appreciated.
    Brian
     
  2. Sep 3, 2013 #2

    nealtw

    nealtw

    nealtw

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    Are you sure you haven't got drip edge vents just above the gutters for intake and some tile roofs have built in ridgevent at the top.
     
  3. Sep 3, 2013 #3

    Jungle

    Jungle

    Jungle

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    It's strange because in the city i grew up none of the houses have roof twirlers, while the small town most of the houses do.
     

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