Ul 790 Roof Assembly

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 790 roof assembly.

Class a b and c roofing required by this section to be listed shall be tested in accordance with ul 790 or astm e108. Ul 790 class a assemblies home resources ul 790 class a assemblies. 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. Roof assemblies resistances to exterior fire exposure are typically tested and classified using two similar test methods.

Copper or thicker can be installed over combustible decks and be considered class a without testing. Class a roof assemblies include those with coverings of brick masonry and exposed concrete roof deck. 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 customer information.

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 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. An exception for combustible decks is that 16 oz sq. Ul certification customers have free access to ul standards not including ul iec based standards.

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. Building with fire safety in mind. Any ul classified type g1 g2 or g3 base ply sheet type 15 20 or 30 felt or ul classified prepared roofing accessory or gcp applied technologies inc. If metal panels are installed over combustible decks the assembly needs to be tested using astm e108 or ul 790.

It also serves as a key differentiator for products within the roofing market. Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction. Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency. Astm e108 standard test methods 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.