Test conditions and pass criteria are shown in table 1.
Roof assembly fire class criteria.
Tested roof systems are fire classified class a b or c where the most fire resistant roof assemblies are class a and class c is least resistant.
Building code fire resistance requirements building codes establish fire resistance requirements for roofs based on the type of construction e g concrete steel wood for the building.
Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.
An exterior fire retardant treated shake roof has a stand alone class b rating.
Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction.
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.
Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance.
1 an intermittent flame test in which the flame is turned on and off during the roof assembly to resist.
Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.
A roofing membrane that is classified as part of a class a assembly when installed over a particular insulation may not qualify as part.
We must emphasize however that individual roof components are not rated at all.
Class a roof assemblies are those that are effective against severe fire test exposure.
B or c roof assembly a class a b or c assembly cannot be.
Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.
Roofing assembly classification will need to be for each roofing project.
Roofing systems must meet or exceed building codes and insurance requirements.
Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction.
But by including a particular underlying material it can meet the requirements for a class a roof.
Examples of a by assembly fire rating include fire retardant treated wooden shakes and aluminum roof coverings.
For roof assemblies with combustible decks wood plank t g astm e 108 and ul 790 require two additional fire tests.
These listings are short summaries to serve as a.
1505 2 class a roof assemblies class a roof assemblies are those that are effective against severe fire test exposure.
It should be noted that these classifications apply to roofing assemblies and not the roofing membrane.
