Taking the Confusion Out of UL and FM Fire Ratings

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Abstract
A solid understanding of Underwriters Laboratories (UL) and Factory Mutualy (FM) fire ratings is essential to proper roof specification. The use of UL classifications and FM approvals for single-ply roofiong materials is subject to substantial confusion, misunderstanding and some misrepresentation in the marketplace. This article attempts to give to straight answers on fire-rating of roofs.

Date
2/1989

Author(s)
Coursey, Richard

Page(s)
34-

Source
RSI/Roofing Siding & Insulation / Advanstar Publications

Keyword(s)
UL; FM; fire rating; fire test; fire resistance

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