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Fire Rating

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Guest User
10/13/2004
How do I find out the fire rating (Class 'A', 'B', or 'C') for metal roofing system? The "UL Roofing Materials and Systems Directory" has listings for "Roof Deck Constructions" which each system is listed by a construction number and they all say "Uplift - Class 90, Fire Not Investigated". The metal roofing material itself is probably Class 'A' since it's non-combustible material, what about the roofing system? (for example, the UL directory clearly states that for asphault shingles made by this manufacturer to be a Class 'A' roof, you need a minimum 15/32-in thick plywood and 30# felt...) Where can I look up info similar to this to prove that certain metal roofing system is Class 'A'? And I am also wondering if you know any other agencies that approve roofing systems besides UL? Does ICBO or Factory Mutual approve roofing systems? Thanks very much!!
Guest User
10/13/2004
Many metal roof systems will have listings with the International Building Code. Fire ratings are granted to metal roofing based upon the roof assembly so you do not need to worry about different ratings between the covering and the system. To obtain information and requirements related to fire ratings on various metal roofing profiles, you will need to contact the manufacturer. Most steel roof systems do carry Class A ratings.
Guest User
10/14/2004
Shall we look at the deck requirements, slope, and underlayment specified in IBC as the minimum standards for installing a metal roof? Installing per IBC doesn't mean your roof is Class 'A', right? And fire rating for metal roofs really depends on the recommended assembly by the manufacturer? Can you tell me what are some of the most popular metal roofing manufacturers out there? I would like to call them to get some general idea on what's required to get a Class 'A' metal roof. Thanks again!
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