Wind on Large Overhangs
Wind on Large Overhangs
(OP)
The code doesn’t really go into depth on wind on large overhangs. We have a 30’-0” overhang and I need advice on how to approach wind loading and uplift on the overhang. I have done a roof components and cladding run but I am not sure if that is accurate. Would we use the same component and cladding load for zones 1, 2, and 3 on both the underside and the top side?
Thank you for your time,
Dennis Boley
Thank you for your time,
Dennis Boley






RE: Wind on Large Overhangs
RE: Wind on Large Overhangs
RE: Wind on Large Overhangs
RE: Wind on Large Overhangs
RE: Wind on Large Overhangs
RE: Wind on Large Overhangs
In the absence of better guidance from ASCE 7 on this subject, I have always defaulted to the most conservative wind loading- overhang pressures. I think the portion of the roof overhang adjacent to the building will have the highest underside (upward) pressure on the ceiling/soffit because the wind is hitting the wall of the structure and then going upwards and there are localized high pressure zones. However, as you get further away from the building wall this pressure likely diminishes. But how much? I think at some point it transitions into behaving more like an open structure with very little upward pressure on the ceiling/soffit. I have heard some suggestions like out 10-15 feet you could switch over to open roof loading pressures. I would not argue with this logic either, and may have taken similar approaches in the past. Or maybe I am way off here...
RE: Wind on Large Overhangs