Pvc Roofing Fire Rating

This is proven if it can.

Pvc roofing fire rating.

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. Ib pvc roofing membranes can be used in many ul class a roof assemblies. But if it is required all the above factors are evaluated to give the structure its rating. 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.

Not all buildings are required to have a class a fire rating for their roofs. Pvc roof membranes are inherently flame resistant but as discussed above that s only one part of the equation. Pvc roofing membranes such as sika s can self extinguish and resist the spread of flame. 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.

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. 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. 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. These roofs are difficult to ignite burn slowly do not support combustion and self extinguish when the source of flame is removed.

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. Pvc roofing membranes have passed fm and ul fire testing and have an unlimited slope approval. Pvc roofs are also extremely durable long lasting and have high. Class a is the highest rating offering the highest resistance to fire and unrated is the worst.

Pvc roofing membranes have a solid fire resistance rating. 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. To achieve a class a rating the roof must be effective against severe fire exposure. These membranes show excellent resistance to spread of flame and self extinguish when the source of the flame is removed.

Polyvinyl chloride vinyl or pvc is a naturally fire resistant polymer a distinction between it and all other roofing plastics. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. Experience maximum flame spread of 6 feet.