Wind Loads on Overhang
Wind Loads on Overhang
(OP)
I am designing the attachment of cladding on the underside of a roof overhang using ASCE 7-05 for the wind load determination. The wind load determined by using the GCp factor from figure 6-11B, page 56 (overhang), is the total load on the overhang, including pressure from the upper and lower surfaces (ref: footnote 6).
Does anyone out there know how to divide the GCp factor into separate values for the upper and lower surfaces? I assume it is not 50/50.
In this case the cladding is only subject to wind loads on the bottom of the overhang. I'm always conservative, but I believe using the total load would be excessive.
Thanks!
Does anyone out there know how to divide the GCp factor into separate values for the upper and lower surfaces? I assume it is not 50/50.
In this case the cladding is only subject to wind loads on the bottom of the overhang. I'm always conservative, but I believe using the total load would be excessive.
Thanks!






RE: Wind Loads on Overhang
John Southard, M.S., P.E.
http://www.pdhlibrary.com
RE: Wind Loads on Overhang
RE: Wind Loads on Overhang
RE: Wind Loads on Overhang
RE: Wind Loads on Overhang
RE: Wind Loads on Overhang
I have come accross a similar problem with free roofs which have both ceiling and roof joists and how to distribute roof pressure to upper and under surface.
RE: Wind Loads on Overhang
SECTION 1609 WIND LOADS
1609.1 Applications. Buildings, structures and parts thereof shall be designed to withstand the minimum wind loads prescribed herein. Decreases in wind loads shall not be made for the effect of shielding by other structures.
All exterior wall coverings and soffits shall be capable of resisting the design pressures specified for walls for components and cladding loads in accordance with Section 1609.1.1.