UL 90 | Ask The Experts Forum | Metal Roofing Alliance

Guest User 1/27/2006	I am trying to determine the correlation between a UL-90 wind rating and wind speed in mph.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/7510/find/
Todd Miller Isaiah Industries, Inc. 1/30/2006	This is pretty complex, including a safety factor of two which is imposed on metal roofs under the building code. However, if a product has passed UL 90 testing, then it would be simulating the effects of winds in excess of 200 mph. However, keep in mind that, in an actual windstorm, proper installation of the roof is critical. Additionally, wind-blown debris and structural movement can impact roof performance.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/7511/find/
Guest User 9/16/2010	200 mph? not true	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/7512/find/

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