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ANSI/SPRI ES-1 Certification
The turn of the century brought a rash of severe weather events and the promise of a dynamic climate that will continue to produce these natural assaults. Experts around the world agree that we are at the precipice of an extreme weather era. Whether due to global warming or simply following cyclical trends, it seems clear that the frequency and severity of high-velocity wind events will continue to place demands on our structural environment.
Some of the more notorious storms of the decade precipitated intensive study of the vulnerability of roofing systems by organizations such as the Roofing Industry Committee on Weather Issues (RICOWI) and Factory Mutual Global (FM). These studies revealed that the vast majority of all weather-related losses (75%) were due to roof failures, and of those, more than half were due to perimeter failure.
As a result, building codes and standards have evolved to demand better design and performance of roofing systems. The 2003 and subsequent editions of the International Building Code (IBC) contain provisions requiring edge-metal flashings (copings, fascia, gravel stop) to be designed and installed in accordance with ANSI/SPRI ES-1, "Wind Design Standard for Edge Systems Used with Low Slope Roof Systems."
1504.5 Edge securement for low-slope roofs. Low-slope membrane roof system metal edge securement, except gutters, shall be designed and installed for wind loads in accordance with Chapter 16 and tested for resistance in accordance with ANSI/SPRI ES-1, except the basic wind speed shall be determined from Figure 1609.
Although these studies and the adoption of the ES-1 standard by IBC are
most directly attributable to the destruction inflicted by
events such as straight-line winds and tornadic activity associated
common seasonal storms inflict wide-spread damage each year. FEMA has
divided the United States into four zones that reflect the number and
strength of extreme windstorms encountered in each region. The tables
the right clearly illustrate that no area is immune to wind-related