Fire Rating Of Roof Systems

Tested roof systems are fire classified class a b or c where the most fire resistant roof assemblies are class a and class c is least resistant.

Fire rating of roof systems.

Class a is the highest rating offering the highest resistance to fire and unrated is the worst. Roof covering packaging that encloses shingles or other roofing that have a fire rating will display the level of fire or wind resistance rating of the materials. Metal is a safe and environmentally responsible choice for a fire resistant roof classic metal roofing systems the leader in producing fire safe roofing for residential applications manufactures products that are 1 20 the weight of most tile products and eligible for class a b or c fire ratings as determined by roof preparation. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence.

The prevent line of polyester reinforced or composite fire rated cap sheets provide an extra protective coating and line of defense to iko s premium asphalt based roofing systems. These assemblies need to meet fire and smoke safety and environmental sustainability requirements. 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. Roofing systems are rated by realistic fire tests.

Fires that originate outside of the structure itself. Ib roof system s products are specifically engineered for strength and our pvc roofing membranes far surpass the minimum astm standard 200 lbf in. Building code fire resistance requirements building codes establish fire resistance requirements for roofs based on the type of construction e g concrete steel wood for the building. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.

Rating having a minimum typical breaking strength of 332 lbf in. Class a class b class c or unrated. Your roof can have one of four fire ratings classifications. Underwriters laboratories has defined the ul 790 standard tests of roofing material fire resistance to external fire sources.

Fire rated wall floor and ceiling assemblies provide the necessary fire and smoke barriers to create compartmentalization during a fire safeguarding against the spread of fire and smoke within a building or to and from a building. Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance.