1608.5 - Very High Roof Separations
When the ratio hr/LT is greater than 1.0, where LT is the dimension in feet of the upper roof perpendicular to the wind flow (perpendicular to lu in Figure 7-8 of ASCE 7) and hr = hb + hc, the drift surcharge load on the lower roof due to drifting of snow from the upper roof may be reduced. The reduced height of the drift surcharge, hdr, shall be not less than: hdr = hr (2 - hr/LT), except that when hr/LT is greater than 2.0, hdr shall be equal to zero.
Notes
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