Roof assemblies resistances to exterior fire exposure are typically tested and classified using two similar test methods.
Ul 790 roof assembly.
Building with fire safety in mind.
Spread of flame ul 790 burning brand testing ul 790 impact test ul 2218.
Coated steel or aluminum roofing panels.
Ul 790 evaluates the ability of the roof assembly to resist a simulated fire source originating from outside the building on which the roof coverings are installed.
If metal panels are installed over combustible decks the assembly needs to be tested using astm e108 or ul 790.
Ul 790 class a assemblies home resources ul 790 class a assemblies.
Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction.
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.
Ul certification customers have free access to ul standards not including ul iec based standards.
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.
Ul certification customer information.
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.
Ice and water shield.
Copper or thicker can be installed over combustible decks and be considered class a without testing.
These ratings are based on the ability to prevent a fire from penetrating through the roof and the ability to minimize the spread of a fire along the roof surface.
Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.
Class a b and c roofing required by this section to be listed shall be tested in accordance with ul 790 or astm e108.
It also serves as a key differentiator for products within the roofing market.
This test standard and closely related standards such as underwriters laboratories ul 790 and uniform building code 15 2 is used to determine the ability of a roof system to hinder the horizontal spread or vertical penetration of an external fire source.
Class a roof assemblies include those with coverings of brick masonry and exposed concrete roof deck.
