Fire Resistant Flat Roof

Shingles are categorized into classes that identify their fire resistance.

Fire resistant flat roof.

Class a is the most fire resistant and should be the choice of anyone living in wildfire prone areas. Description the firestone rubbergard epdm fr fire retardant membrane is a 100 cured roofing membrane made of a synthetic rubber ethylene propylene diene terpolymer. Rubbergard epdm fr fire retardant roofing membrane 1. If you have one of these roofing types you might want to look into replacing the roofing material for a more fire resistant option.

The fire retardant sheet is made up of a bottom ply of standard and a top ply of fire retardant compound. A one hour rating would mean the structural elements have not yet reached their yield point when exposed to a under deck heat load defined in astm e119 for steel structural members as reaching 1 070 degrees f. Polycarbonate is almost as transparent as glass but with added benefits. Classes b and c denote progressively less fire resistant qualities.

Most metal roofs are made of steel copper zinc and alloys that are best for the dry environment in nevada. Class a roofing materials are the most fire resistant. A rooftop fire can result in ignition of the underlying combustible roof deck if the mass of surfacing membrane and insulation is inadequate to thermally protect the deck from reaching its ignition temperature. As many people know wood is fuel for a fire despite the fact that it is a valuable and reliable roofing material.

Examples of a class a roof covering include concrete or clay roof tiles fiberglass asphalt composition shingles and metal roofs. Meeting code is necessary but exceeding it could result in a thinner less weather resistant roof. It is flexible fire resistant chemical resistant and virtually unbreakable. It is much stronger than glass having an impact resistance that is 200 times that of glass.

Class a is the highest rating offering the highest resistance to fire and unrated is the worst. The benefit of metal tiles is that they are non corrosive and sit strong on houses with a steep slope. Fire resistance ratings time temperature include structural elements and everything above including the roof membrane and its surfacing. Metal tiles are made of a material that does not ignite when on fire with a fire resistant barrier with a class a protection.

Wood shake plywood or particle board roof are the most common roofing types listed as class c. An example of an unrated covering is an untreated wood shake roof. An alternative to glass is polycarbonate. The fire rating of a roof covering is either class a class b class c or unrated.

An unrated roof is the most vulnerable the most common example of an unrated roof covering is one made using non fire retardant treated wood shakes or shingles. How fire resistant is your current roof.