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Changes reduce some FM classifications

Tech Today Article



FM 4470; uplift; resistance; membrane; liquid-applied; roof assemblies;

FM Approvals has revised its criteria for determining the uplift resistances of membrane and liquid-applied roof assemblies. Because many roofing professionals rely on FM Approvals' classifications when designing and specifying low-slope roof assemblies, you should be aware of the changes made and their effect on specific roof assembly classifications.

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