The ul 790 classification e g.
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.
This system is classified for all types of roof deck construction for fire resistive construction methods.
Ul class a industrial roof system.
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.
To achieve a class a rating the roof must be effective against severe fire exposure.
Class b designates resistance to relatively moderate fire test.
The details for the manufacturers system typically include the following information.
It also serves as a key differentiator for products within the roofing market.
Grade c d or sheathing.
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.
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.
Experience maximum flame spread of 6 feet.
Fire resistance is based on two test standards.
There are three levels of fire resistance.
Class a is the highest level.
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 roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.
Certification database ul product iq access ul certification data on products components and systems identify alternatives and view ul guide information with product iq.
It is not limited to thickness or incline restrictions like most foam roofing systems.
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.
Any ul class a b or c roofing system tgfu or prepared roof covering tfwz layer 2 roof sheathing.
15 32 thick wood structural panels min.
Class a roof assemblies are those that are effective against severe fire test exposure.
