Ul Class A Roof Assembly

Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction.

Ul class a roof assembly.

A secure online source for increased visibility into your ul project files product information documents samples and services. 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. All class 1 roof assemblies are class a roofs but not. Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.

For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs. Order to gain a class 1 designation. Contrary to what many think there are no class a roofing membranes. Under ul 790 roof systems are evaluated for external fire.

Coated steel or aluminum roofing panels. The operative word here is systems. It also serves as a key differentiator for products within the roofing market. Roof systems are segregated into combustible and non combustible construction types.

A roofing membrane that is classified as part of a class a assembly when installed over a particular insulation may not qualify as part. 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. 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. Class a roof assemblies are those that are effective against severe fire test exposure.

The ul evaluation report an additional differentiator provides code authorities. 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. Truth about roofing underlayments 4 photovoltaic systems scan with your mobile qr code reader to find out more about ul support for code authorities. Ice and water shield.

It should be noted that these classifications apply to roofing assemblies and not the roofing membrane. Assembly rated class a roof coverings are those that meet class a standards when combined with other elements. Ul 790 class a assemblies home resources ul 790 class a assemblies. Questions often arise about the construction needed to achieve a class a b or c fire rating for a roof assembly.

The information needed to achieve code compliant installations is included below. The preeminence of ul is most likely due to their ansi ul 790 protocol. 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.