SPRI recently published ANSI/SPRI WD-1, "Wind Design Practice
for Roofing Assemblies." This standard provides a recognized
consensus-developed methodology for designing wind-uplift
resistances for low-slope built-up, polymer-modified bitumen and
single-ply membrane roof systems that do not rely on aggregate or
paver ballast to provide their wind resistances.
ANSI/SPRI WD-1 is divided into two primary parts. The first part
addresses how to determine design wind-uplift loads. The second
part discusses choosing an appropriate roof system by comparing
factored, tested wind-uplift resistance capacities with the design
wind-uplift loads determined in the first part.
In ANSI/SPRI WD-1, determining design wind-uplift loads is
accomplished using 21 tables based on Building Category II, surface
roughness (exposure category), building height (mean roof height)
and peak gust wind zone...
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