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Soparklion 09-02-2013 05:48 PM

Attic is an unvented box
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.

nealtw 09-02-2013 09:43 PM

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.

Jungle 09-03-2013 02:06 PM

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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