Ul Class A Roof Assembly

Order to gain a class 1 designation.

Ul class a roof assembly.

Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency. The preeminence of ul is most likely due to their ansi ul 790 protocol. Coated steel or aluminum roofing panels. Truth about roofing underlayments 4 photovoltaic systems scan with your mobile qr code reader to find out more about ul support for code authorities.

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. 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. 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. For example shake roofing with a fire retardant treatment rates class b on its own but achieves a class a rating when combined with specified underlying materials such as type 72 roll roofing material.

Roof systems are segregated into combustible and non combustible construction types. Roofing assembly classification will need to be for each roofing project. 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. Under ul 790 roof systems are evaluated for external fire.

All class 1 roof assemblies are class a roofs but not. Ul 790 class a assemblies home resources ul 790 class a assemblies. While a class 1 assembly can be substituted for a class a b or c roof assembly a class a b or c assembly cannot be substituted for a class 1 roof assembly. Class a roof assemblies are those that are effective against severe fire test exposure.

The information needed to achieve code compliant installations is included below. Certification database ul product iq. It also serves as a key differentiator for products within the roofing market. The operative word here is systems.

A secure online source for increased visibility into your ul project files product information documents samples and services. Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction. Ice and water shield. A roofing membrane that is classified as part of a class a assembly when installed over a particular insulation may not qualify as part.

Contrary to what many think there are no class a roofing membranes. The ul evaluation report an additional differentiator provides code authorities. Questions often arise about the construction needed to achieve a class a b or c fire rating for a roof assembly.