Ul 921 Roof Assembly

The ul certification mark on fire resistant products systems and assemblies is relied on by code enforcement officials and buyers to provide confidence that products and systems meet regulatory and market requirements.

Ul 921 roof assembly. To the present day static simulation was the only available method to compare roofing assemblies with winduplift resistance. Base layer attached with 1 7 8 48 mm galvanized roofing nails 16 406 mm o c. Helpful documents and resources for usg s roof assemblies can be found on this page. Face layer attached with 2 3 8 60 mm galvanized roofing nails 8 203 mm o c.

Deep steel deck may be used when supports are spaced 4 ft. The published information cannot always address every construction nuance encountered in the field. It is a key differentiator for products within the exterior wall assembly market. 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.

The listed assemblies in this document may not contain all components of the approved assembly. Stagger joints between. A secure online source for increased visibility into your ul project files product information documents samples and services. Ul 790 evaluates the ability of the roof assembly to resist a simulated fire.

Two layers 5 8 15 9 mm densglass fireguard sheathing applied vertically or horizontally to 2 x 4 wood studs 16 406 mm o c. Roof deck units to be loaded not more than 75 percent of their max allowable bending stress. Or classified steel floor and form units. Ibc section 1505 requires that roof assemblies meet the ul 790 class a b or c fire performance based on the type of construction of the building on which they are utilized.

Ultraply tpo roof systems tested assembly guide august 2020 it is the responsibility of the user of this document to verify the included assemblies in the charts below with the associated firm s ul fm etc. For clear spans not more than 7 ft 8 3 8 in. The unrestrained assembly rating is equal to the restrained assembly rating. 6 usg fire resistant assemblies test certification test conditions and fire and sound tested assemblies listed in this selector are based on characteristics properties and performance certificationof materials and systems obtained under controlled test conditions as set forth in the appropriate astm standard in effect at the time of test.

Certification database ul product iq. Fire resistance assemblies and products are developed by the design submitter and have been investigated by ul for compliance with applicable requirements.