Metal Siding Fire Rating

Fibre cement cladding from james hardie has a fire rating of a2 s1 d0 which is the highest possible fire rating for a coloured cladding board.

Metal siding fire rating.

The highest rating possible for fire resistance. If the numeric value is less than 25 then a class a flame spread index is assigned. Most metal siding is rated as noncombustible which means that in fire safety testing it was shown not to ignite and spread fires. Steel siding not only offers protection against a fire it is also naturally resistant and does not require the use of fire resistant treatments.

The thickness and number of the layers of type x gypsum wallboard are specified for each rating. Where the fire separation distance is greater than 5 feet the exterior wall needs only be rated from the inside section 705 2. This means that it is a non combustible cladding and will not ignite when exposed to direct flame or extreme heat nor will it contribute fuel to a fire. Our panel assemblies are ul class a fire rated when installed over gaf versashield underlayment or over min.

You ll need to take that into consideration when selecting your siding. Rollex navigator steel siding for example has a class a fire rating. The ratings are for unsymmetrical walls that require ratings from both sides. Numeric values for class b are between 25 and 75.

New uk legislation for cladding. Astm e108 fire resistance fire rated roof systems ibc metal roof metal roof advantages ul 790. Also metal siding is generally a more affordable option it s still more expensive than vinyl. Values above 75 fall into the class c category.

Brick and stone also rate well for fire resistance. Did you find this article helpful. In fact metal is arguably one of the best materials to put on your home to reduce fire damage. A class a rating means it is going to offer the maximum protection possible against fire and will not spread flames.

The mbma fire tests of exterior walls in 1997 resulted in a new uldesign no. 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. Less fire separation to the closest interior lot line to the centerline of a street or public way or to an imaginary line between two buildings on the same property be rated for exposure to fire from both sides. The ul fire rating for all our roofing panels has been expanded.

Most types of metal siding are rated as noncombustible which means that they have not been found to ignite and spread fires.