WebNov 29, 2024 · One common misconception is the belief that FM Approvals’ windstorm classification ratings such as 1-60, 1-90 or 1-120 correlate to wind speeds of 60, 90 or 120 miles per hour (mph). Building owners and some specifiers and designers don’t realize that the ratings apply to uplift pressures in pounds per square foot (psf), not wind speeds. WebMar 21, 2024 · For example, an FM I-90 classification designates a tested design uplift resistance of 45 psf of the roofing system. Therefore, the values in a roof systems’ uplift resistance is based on pounds per square foot (psf), not design wind speeds. The design wind speed or basic wind speed is used in the calculation of the design uplift pressure …
Wind by design Professional Roofing magazine
WebMay 21, 2024 · Low-slope built-up, modified bitumen and single-ply 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 Test Methods RE-1, RE-2 and RE-3 of ANSI/SPRI ES-1, except Vult wind speed shall be determined from Figure … WebWhen FM 1- guidelines are not reuired ind uplit calculations should be done to determine hether a more appropriate uplit pressure 1-6 or 1- is better suited or that speciic building … sacred pace book
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WebAug 11, 2010 · 2 Don't design the roof to FM standards if you don't have to. “The roofing industry, including manufacturers, is guilty of creating generic, boilerplate specifications that state a building shall meet FM 1-90 UL Class A,” says Schwetz. However, once wind-speed calculations are determined for the building, it may not need to meet this high ... http://archive.oa.mo.gov/fmdc/dc/fmdc_dip/6%20Roof%20Design%20Manual/Roof%20Design%20Manual.pdf WebBasic wind speed (mph) Pressure (psf) 85 18.5 90 20.1 100 25.6 110 31.0 120 36.9 130 43.2 140 50.2 150 57.6 160 65.5 170 74.0 180 82.0 3 4. ASCE 7‐16 and its impact on roof system designs June 18, 2024 ... FM 1‐90 FM 1‐90 FM 1‐105 This comparison illustrates why it is important for ... isc work shirt