Ul Class A Roofing System

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.

Ul class a roofing system.

Class b designates resistance to relatively moderate fire test. Ul 790 and astm e 108. The details for the manufacturers system typically include the following information. 15 32 thick wood structural panels min.

This system is classified for all types of roof deck construction for fire resistive construction methods. Ul class a industrial roof 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. 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. Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency. Grade c d or sheathing. Experience maximum flame spread of 6 feet.

The ul 790 classification e g. To achieve a class a rating the roof must be effective against severe fire exposure. 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. Certification database ul product iq access ul certification data on products components and systems identify alternatives and view ul guide information with product iq.

Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating. This is proven if it can. Class a is the highest level. It is not limited to thickness or incline restrictions like most foam roofing systems.

Class a designates resistance to relatively severe fire test exposure. Fire resistance is based on two test standards. There are three levels of fire resistance. Class a roof assemblies are those that are effective against severe fire test exposure.

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.