Ul Class A Roofing System

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Ul class a roofing system.

For fire tests of roof coverings and ul 790 standard test methods for fire tests of roof coverings the tests provide the basis for the class a b and c designations. The ul certification mark on roofing products and assemblies is relied on by code enforcement officials and buyers to verify that your products and systems meet regulatory requirements. 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. Any ul class a b or c roofing system tgfu or prepared roof covering tfwz layer 2 roof sheathing.

This is proven if it can. Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating. There are three levels of fire resistance. Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.

Class a b or c the deck construction supporting the roofing system combustible or noncombustible any restrictions on the roof incline required or optional if so indicated barrier boards ply sheets and surfacing. Class a designates resistance to relatively severe fire test exposure. The ul 790 classification e g. A class 1 roof has undergone a series of tests that evaluate the entire roof assembly including the external spread of flame test utilized for the class a rating.

Experience maximum flame spread of 6 feet. Ul class a industrial roof system. Class b designates resistance to relatively moderate fire test. 15 32 thick wood structural panels min.

It also serves as a key differentiator for products within the roofing market. Class a roof assemblies are those that are effective against severe fire test exposure. Class a is the highest level. Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction.

To achieve a class a rating the roof must be effective against severe fire exposure. This system is classified for all types of roof deck construction for fire resistive construction methods. Fire resistance is based on two test standards. Ul 790 and astm e 108.

A roof is classified as a class a as the result of one test the external spread of flame test astme 108 or ul 790 standard.