Fire Rated Wood Roof Assembly

W 1 x 8 wood planking 2 layers 1 2 plywood span 10 live load 40lbs.

Fire rated wood roof assembly.

For occupancies such as stores apartments of fices and other commercial and industrial uses build ing codes commonly require floor ceiling and wall assemblies to be fire resistance rated in accordance with standard fire tests. 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. Assemblies include ducts dampers lighting or other fixtures in the tested assembly. Substrate roof floor ceiling time assembly ff file no.

Fire rated wood frame wall and floor ceiling assemblies. See full report for details. Floor assemblies using wood trusses may be approved for exemption if the floor assembly demonstrates equivalent fire performance. Therefore in order to apply this exemption to floor trusses the trusses must be tested and evaluated for equivalency to the fire performance of nominal 2 x 10 lumber.

This section contains procedures for calculating the fire resistance ratings of walls floor ceiling and roof ceiling assemblies based in part on the standard method of testing referenced in section 703 2. 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. 2 x 6 f d joists 16 o c. Where the room side fire resistance rated membrane of the corridor is carried through to the underside of the floor or.

Helpful documents and resources for usg s roof assemblies can be found on this page. 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. Building code requirements. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels.

The reluctance to rely on approved test results is unwarranted as explained in section 17a and section 17b of sbca s metal plate connected wood truss handbook. For additional information on fire resistance rated assemblies see sbca research report 1509 01. The fire resistance rating of a wood frame assembly is equal to the sum of. 722 6 2 1 fire resistance rating of wood frame assemblies.