Gaf versasheild is a fiberglass underlayment that gets an assembly a class a rating.
Class a metal roof assembly.
A roofing membrane that is classified as part of a class a assembly when installed over a particular insulation may not qualify as part.
Class a roof assemblies also include ferrous or copper shingles or sheets metal sheets and shingles clay or concrete roof tile or slate installed on noncombustible decks or ferrous copper or metal sheets installed without a roof deck on noncombustible framing.
Coated steel panels surfacing identified as deep vee r tee high seam tee zee lock zee lock double lock cee lock tee lock bermuda roof m s tile s spanish tile deep deck and double rib and tee lock panel.
While a class 1 assembly can be substituted for a class a.
Class a roof assemblies include minimum 16 ounce per square foot copper sheets installed over combustible decks.
Building code fire resistance requirements.
It should be noted that these classifications apply to roofing assemblies and not the roofing membrane.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
Class 1 roof covers.
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.
A common misconception about roofs fire ratings is that building codes require class a.
Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.
For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs.
The other option in densdeck that is a gypsum panel that gets the roof assembly 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.
To get the class a rating on a metal roof you need a listed assembly.
Roofing assembly classification will need to be for each roofing project.
A roof assembly must pass all these tests in order to gain a class 1 designation.
0 0416 kg m 2 copper sheets installed over combustible decks.
Class a roof assemblies include minimum 16 oz sq.
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 also include ferrous or copper shingles or sheets metal sheets and shingles clay or concrete roof tile or slate installed on noncombustible decks or ferrous copper or metal sheets installed without a roof deck on noncombustible framing.
