Ul Class A Roofing System

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Ul class a roofing system.

Fire resistance is based on two test standards. 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. This system is classified for all types of roof deck construction for fire resistive construction methods. 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.

Class a is the highest level. Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction. Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating. Grade c d or sheathing.

It is not limited to thickness or incline restrictions like most foam roofing systems. To achieve a class a rating the roof must be effective against severe fire exposure. Class a designates resistance to relatively severe fire test exposure. Ul class a industrial roof system.

Ul 790 and astm e 108. The details for the manufacturers system typically include the following information. Experience maximum flame spread of 6 feet. 15 32 thick wood structural panels min.

Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency. The ul 790 classification e g. 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 b designates resistance to relatively moderate fire test.

This is proven if it can. It also serves as a key differentiator for products within the roofing market. 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. There are three levels of fire resistance.

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.