All class 1 roof assemblies are class a roofs but not.
Ul class a 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.
Questions often arise about the construction needed to achieve a class a b or c fire rating for a roof assembly.
Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.
Class a roof assemblies are those that are effective against severe fire test exposure.
The preeminence of ul is most likely due to their ansi ul 790 protocol.
Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.
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.
The ul evaluation report an additional differentiator provides code authorities.
Under ul 790 roof systems are evaluated for external fire.
It should be noted that these classifications apply to roofing assemblies and not the roofing membrane.
It also serves as a key differentiator for products within the roofing market.
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.
Order to gain a class 1 designation.
Roofing assembly classification will need to be for each roofing project.
Certification database ul product iq.
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 class a assemblies home resources ul 790 class a assemblies.
Truth about roofing underlayments 4 photovoltaic systems scan with your mobile qr code reader to find out more about ul support for code authorities.
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.
Ice and water shield.
The information needed to achieve code compliant installations is included below.
A secure online source for increased visibility into your ul project files product information documents samples and services.
The operative word here is systems.
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.
For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs.
Contrary to what many think there are no class a roofing membranes.
