Class 1 roof covers.
Class a metal roof assembly.
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.
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.
While a class 1 assembly can be substituted for a class a.
The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.
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.
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.
0 0416 kg m 2 copper sheets installed over combustible decks.
Aluminum panels surfacing identified as tee cee lock zee lock zee lock double lock and tee lock.
For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs.
A common misconception about roofs fire ratings is that building codes require class a.
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.
Building code fire resistance requirements.
It should be noted that these classifications apply to roofing assemblies and not the roofing membrane.
A roof assembly must pass all these tests in order to gain a class 1 designation.
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.
Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.
Gaf versasheild is a fiberglass underlayment that gets an assembly a class a rating.
Class a roof assemblies include minimum 16 ounce per square foot copper sheets installed over combustible decks.
The other option in densdeck that is a gypsum panel that gets the roof assembly the class a rating.
Class a roof assemblies include minimum 16 oz sq.
Unfortunately the icc report indicates it requires a vent roof assembly.
