Class A Metal Roof Assembly

Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.

Class a metal roof assembly.

Aluminum panels surfacing identified as tee cee lock zee lock zee lock double lock and tee lock. Class a roof assemblies include minimum 16 ounce per square foot copper sheets installed over combustible decks. A roof assembly must pass all these tests in order to gain a class 1 designation. Building codes establish fire resistance requirements for roofs based on the type of construction e g concrete steel wood for the building.

Building code fire resistance requirements. A roofing membrane that is classified as part of a class a assembly when installed over a particular insulation may not qualify as part. A common misconception about roofs fire ratings is that building codes require 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 1 roof covers. To get the class a rating on a metal roof you need a listed 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. It should be noted that these classifications apply to roofing assemblies and not the roofing membrane.

Class a roof assemblies include minimum 16 oz sq. Roofing assembly classification will need to be for each roofing project. 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.

While a class 1 assembly can be substituted for a class a. 0 0416 kg m 2 copper sheets installed over combustible decks. 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. Unfortunately the icc report indicates it requires a vent 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. 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.