Meneghini Claudio
hi, i found in a metal roofing brochure a reference about UL 90. I don't know this standard and i'm not able to find it on UL website. Can you give some information about this standard ? thank you so much !!!
David Stermer
Meneghini, The standard that this is referring to is UL 580 - Test for Uplift Resistance of Roof Assemblies. The '90' is the typical result, specifically the result is Class 90. UL 580 is a test that simulates wind uplift with uniform air pressure. Regards, David Stermer

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