valley slope

Old 08-20-01, 09:33 PM
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I will have two roofs that slope toward eachother, creating a valley. One side will be 4/12 with asphault shingles, and the other will be 1/12 with roll roofing.I live in southern california where the only real threat is rain, does the valley have to be sloped to one side to get the water to drain. If so what is the minimum slope for the valley?
Old 08-21-01, 03:33 PM
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You don't want the water laying there, even in the warm California sun. Slope it one way or the other which ever seems best. As far as slope, 1/4 inch of rise per one foot of run is considered enough to drain a roof. How high each side of the valley is lined, how much water you expect to build up in heavy rains, and how it will look should be considered. Personally I would slope it as much as I could. The idea of a roof is to shed water, the faster the better.

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