Class a roof assemblies shall be permitted for use in buildings or structures of all types of construction.
Rated roof assemblies.
Sound transmission class stc rating.
Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.
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.
Floor ceiling assemblies yes ceiling roof no.
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.
All new fire rated roof ceiling assembly files.
Class a roof assemblies are those that are effective against severe fire test exposure.
Both are burn through tests and the ultimate roof systems rating is the lowest of the three tests.
Dec 14 2011 7 zoning overlay requires roof wall stc 65.
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.
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.
Where the room side fire resistance rated membrane of.
Shaft wall limiting heights spans.
Use assembly that is rated to meet exceed zone 3 across the whole roof.
Helpful documents and resources for usg s roof assemblies can be found on this page.
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.
Joined oct 20 2009 messages 172 location tucson az.
Project is within an air force approach zone.
Have a question about assemblies.
If the roof deck is combustible such as wood plywood or osb two additional tests must be conducted.
The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams.
Find usg product specific cad and revit files.
The brands consist of an ignited wood lattice placed directly on top of the test specimen.
The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels.
Class a roof assemblies and roof coverings shall be listed and identified as class a by an approved testing agency.
Use assembly that is rated to meet exceed each zone.
Reduce the spacing between rows of fasteners by using one intermediate row in zone 2 and zone 3.
