Metal Roof Deck Fire Rating

Time temperature ratings the third major roof system fire test is astm e 119.

Metal roof deck fire rating.

As explained there these ratings are applied to certain types of roof ceiling and floor ceiling construction assemblies which are tested and assigned hourly ratings mandated by building codes or other building safety requirements. This is a system test that includes structural members such as beams trusses and roof deck. Both fm global and underwriters laboratories have tests to evaluate this type of exposure. Vulcraft fire resistance ratings with steel joists agency related.

Strength in fire is ensured by the inclusion of mesh sometimes called fabric or fibre reinforcement mesh reinforcement can be that present in ordinary room temperature design. Metal roof deck panels batts and blankets 60 ns p265 10k1 26 msg min. These tests may be conducted at ul inc fm global or any other certified testing laboratory. Astm e 108 for exposure to fires originating outside the building.

Class a is the highest rating offering the highest resistance to fire and unrated is the worst. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. If you are unfamiliar with ul fire resistance ratings begin with a review of meeting code requirements pg. They are rated class a severe b moderate or c light based on.

Astm e108 defines fire test methods for roof coverings. Ul and fm list many roof ceiling systems in their publications. Ns w6 x 16 p301. Most metal panel manufacturers have tested their roof assemblies and most if not all metal panels and shingles can be used in class a fire rated roof systems.

E108 defines the following conditions. Fiber board 48 w6 x 16 p267 10k1 metal roof deck panels batts and blankets 60 ns p268 20g 14plf 20g 14plf w8 x 15 10k1 24 msg min. It may not be necessary to add reinforcement solely for the fire condition. Over non combustible roof decks such as steel poured gypsum or concrete only the spread of flame on the top surface of the roof system is evaluated.

Standard method of fire tests of roof coverings ul 790. Of concrete over the top of the deck is required for fire ratings with fireproofing on the underside of the deck. Fm calls their acceptable risk systems class 1 while ul calls theirs classified insulated metal deck constructions. Astm e108 fire resistance fire rated roof systems ibc metal roof metal roof advantages ul 790.