Ul 790 and astm e 108.
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 industrial roof system.
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.
Any ul class a b or c roofing system tgfu or prepared roof covering tfwz layer 2 roof sheathing.
Certification database ul product iq access ul certification data on products components and systems identify alternatives and view ul guide information with product iq.
15 32 thick wood structural panels min.
Due to the materials used in their construction most asphalt shingle roof assemblies have a class a fire resistance rating.
Class a roof assemblies are those that are effective against severe fire test exposure.
This system is classified for all types of roof deck construction for fire resistive construction methods.
This is proven if it can.
Class b designates resistance to relatively moderate fire test.
Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction.
Class a designates resistance to relatively severe fire test exposure.
Class a is the highest level.
It is not limited to thickness or incline restrictions like most foam roofing systems.
Experience maximum flame spread of 6 feet.
The details for the manufacturers system typically include the following information.
The ul 790 classification e g.
There are three levels of fire resistance.
Grade c d or sheathing.
Fire resistance is based on two test standards.
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.
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.
