Pvc Roofing Fire Rating

Class a is the highest rating offering the highest resistance to fire and unrated is the worst.

Pvc roofing fire rating.

Pvc roofing membranes such as sika s can self extinguish and resist the spread of flame. 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. Our preference at royalty roofing is pvc single ply roofing systems but we can install any type of roof that our customers require. But if it is required all the above factors are evaluated to give the structure its rating.

Not all buildings are required to have a class a fire rating for their roofs. Experience maximum flame spread of 6 feet. Pvc roofing membranes have passed fm and ul fire testing and have an unlimited slope approval. These roofs are difficult to ignite burn slowly do not support combustion and self extinguish when the source of flame is removed.

Pvc roofs are also extremely durable long lasting and have high. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. A material with a loi value above 21 air contains 21 oxygen should not burn in air at room temperature and a value above 25 27 means that the material will only burn under conditions of very high applied heat. In a laboratory experiment a flame source was applied for ten seconds to sbs modified bitumen fire retardant tpo sikaplan membrane and fire retardant epdm.

Ib pvc roofing membranes can be used in many ul class a roof assemblies. Class a roofing is the preferred choice for any home but this type of roofing is particularly important if you live in an area that is prone to wildfires. Rigid pvc has an oxygen index of 45 50 compared to 21 22 for wood and 17 18 for most thermoplastics. This is proven if it can.

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. To achieve a class a rating the roof must be effective against severe fire exposure. Pvc roof membranes are inherently flame resistant but as discussed above that s only one part of the equation. The slope of the test specimen is preselected and since steeper slopes are more of a challenge due to melting material feeding the fire the rating applies to the maximum slope passed.

Pvc roofing membranes have a solid fire resistance rating. Polyvinyl chloride vinyl or pvc is a naturally fire resistant polymer a distinction between it and all other roofing plastics. Vinyl roofing membranes contain additional fire retardants making this cool roofing material slow to catch or spread fire and self extinguishing when the source of heat or flame is removed.