Fire Rating Of Roof Systems

Your roof can have one of four fire ratings classifications.

Fire rating of roof systems.

Underwriters laboratories has defined the ul 790 standard tests of roofing material fire resistance to external fire sources. Iko fire rated roofing systems include those designed to handle extreme temperatures and to mitigate fire. Ib roof system s products are specifically engineered for strength and our pvc roofing membranes far surpass the minimum astm standard 200 lbf in. Class a is the highest rating offering the highest resistance to fire and unrated is the worst.

Fires that originate outside of the structure itself. Rating having a minimum typical breaking strength of 332 lbf in. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. 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.

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. 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. We must emphasize however that individual roof components are not rated at all. A class a roof is ideal for fire protection and may be required by your building codes depending on your place of residence.

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. Fire ratings for roofs are classified as either class a class b class c or are unrated if a roof covering cannot meet the requirements for any of these classifications. Roofing systems are rated by realistic fire tests. Class a class b class c or unrated.

These assemblies need to meet fire and smoke safety and environmental sustainability requirements. 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.