Fire Rated Wood Roof Assembly

Floor assemblies using wood trusses may be approved for exemption if the floor assembly demonstrates equivalent fire performance.

Fire rated wood roof assembly.

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. Fire rated wood frame wall and floor ceiling assemblies. For additional information on fire resistance rated assemblies see sbca research report 1509 01. 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.

See full report for details. Substrate roof floor ceiling time assembly ff file no. Fire rated suspended ceiling wood truss council of america floor or roof fire notes 1. 722 6 2 1 fire resistance rating of wood frame assemblies.

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. 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. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. 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.

The fire resistance rating of a wood frame assembly is equal to the sum of. W 1 x 8 wood planking 2 layers 1 2 plywood span 10 live load 40lbs. 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. 2 x 6 f d joists 16 o c.

Fire safety caution passing a fire test in a controlled laboratory setting and or certifying or labeling a product as having a one hour two hour or any other fire resistance or protection rating and therefore as acceptable for use in certain fire rated assemblies systems does not mean that either a particular assembly system. 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. Assemblies include ducts dampers lighting or other fixtures in the tested assembly. Fire resistance rated truss assemblies.