Ul Class A Roofing System

Ul 790 and astm e 108.

Ul class a roofing system. Class a roof assemblies are those that are effective against severe fire test exposure. Ul class a industrial roof system. Class b designates resistance to relatively moderate fire test. The ul 790 classification e g.

This is proven if it can. 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. Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.

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. Any ul class a b or c roofing system tgfu or prepared roof covering tfwz layer 2 roof sheathing.

Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction. 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. There are three levels of fire resistance. Class a designates resistance to relatively severe fire test exposure.

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. It also serves as a key differentiator for products within the roofing market. Class a is the highest level. 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.

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. 15 32 thick wood structural panels min. The details for the manufacturers system typically include the following information. Fire resistance is based on two test standards.

To achieve a class a rating the roof must be effective against severe fire exposure.