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Drift on Sloped Roof

Drift on Sloped Roof

Drift on Sloped Roof

(OP)
Can drift be reduced by the sloped roof factor?
Using ASCE 7

EIT
www.HowToEngineer.com

RE: Drift on Sloped Roof

No, but there is a suggested procedure in the ASCE document "Guide to the Snow Load Provisions of ASCE 7-10" by O'Rourke. If the top of the sloped lower roof is below the upper flat roof, calculate your drift as if the lower roof is flat. Then redistribute that cross-sectional area of the drift to create a drift with the same cross-sectional area top surface sloped at 4:1 and the bottom surface sloped equal to the roof slope. If the two roofs meet (i.e., the flat upper roof transitions directly into the sloped lower roof like a mansard roof) then it's a more complicated calculation.

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