Rated Roof Assemblies

Elements of buildings the fire resistance rating classifies the ability of an assembly to confine and isolate fire within a zone comprised of fire resistance rated walls ceiling and floor assemblies.

Rated roof assemblies.

Floor ceiling assemblies yes ceiling roof no. The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams. Sound transmission class stc rating. Have a question about assemblies.

Use assembly that is rated to meet exceed zone 3 across the whole roof. If the roof deck is combustible such as wood plywood or osb two additional tests must be conducted. The stc rating shown reflects testing or evaluation of an assembly with one or more products under test conditions and may not apply to all products listed for each assembly. Use assembly that is rated to meet exceed each zone.

Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency. Shaft wall limiting heights spans. Project is within an air force approach zone. Floor ceiling assembly below to the underside of the floor or roof sheathing slab or deck above or to the fire resistance rated floor ceiling or roof ceiling assembly above and shall be securely attached thereto.

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. Refer to our roof ceiling assembly documents which includes ul fire rated roof assemblies for easy guidance through the assembly of a roof or ceiling on your next project. Ultimately the design and detailing of the project assembly or system is the responsibility of a professional and all projects must comply with applicable building. All new fire rated roof ceiling assembly files.

Our cad and revit library of design drawings of wall intersections joints and other construction details. Dec 14 2011 7 zoning overlay requires roof wall stc 65. Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction. Joined oct 20 2009 messages 172 location tucson az.

Assembly rated class a roof coverings are those that meet class a standards when combined with other elements. Where the room side fire resistance rated membrane of. Find usg product specific cad and revit files. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels.

Reduce the spacing between rows of fasteners by using one intermediate row in zone 2 and zone 3. Class a roof assemblies are those that are effective against severe fire test exposure. Helpful documents and resources for usg s roof assemblies can be found on this page.