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| Metal Roofing Wind Uplift Requirements | |||||||||
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Most damage accurs at low wind speed |
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| Most roofing related wind damage occurs at relatively low wind speeds. Although hurricane and tornado winds are to blame for seventy-five percent of the total loss dollar volume, these storms represent only twenty-seven percent of roof damage insurance claims. Until recently, architects and engineers have not had a reliable standard procedure to determine the structural performance capacity of standing seam metal roofing systems. Lacking a better method, many specifiers have relied on the Underwriters UL 90 classification, theoretical engineering calculations, and guarantees from installers or manufacturers. Unfortunately this has often resulted in the quality and performance levels of a project being determined by “the bravest bidder”, rather than the engineer of record. Fortunately, help has arrived in the form of a new ASTM standard. With the proper understanding and use of ASTM E 1592, the “Standard Test Method for Structural Performance of Sheet Metal Roof and Siding Systems by Uniform Static Air Pressure Difference”, architects can have a much greater assurance that the system they specify (and that actually gets approved and installed) can meet the wind uplift pressures required by the building code (reference AIA Masterspec 07411-2). | |||||||||
| Above: the anchor clips are all that is left of the standing seam metal roofing system that once covered these buildings. Below: this shows a seam that has ruptured and is beginning to come apart. Both are due to improper clip spacing . ASTM E 1592 will assist you in determining the proper clip spacing. | |||||||||
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