Roof Ceiling Fire Rating

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.

Roof ceiling fire rating. Some are reluctant to rely on test results from flat parallel chord trusses applied to sloped roof trusses. Floor ceiling and roof ceiling systems were fire tested at less than 36 inches total depth. Astm e119 standard test methods for fire tests of building construction and materials is the test standard for determining the fire resistance rating of partitions floor ceiling assemblies roof ceiling assemblies beams and columns. Where the room side fire resistance rated membrane of the corridor is carried through to the underside of the floor or roof sheathing deck or slab of a fire resistance rated floor or roof above the ceiling of the corridor shall be permitted to be protected by the use of ceiling materials as required for a 1 hour fire resistance rated floor or roof system.

You can use only the specific type size and minimum. No ceiling or suspension system product alone constitutes a fire rated assembly. Fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. A question has come up concerning sloped roof trusses and fire assembly ratings.

12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr. Urb concealed grid system and tile. Ul tests rate an entire assembly. Helpful documents and resources for usg s roof assemblies can be found on this page.

Concrete with cellular steel 3 hr. Both ul and ga include specific guidance regarding the use of insulation in assemblies. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. Do you have any information regarding the suitability of the fire rated ceiling assemblies for sloped roof trusses.

3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete. Fire tests may be conducted at any one of several recognized facilities. This is a system test that includes structural members such as beams trusses and roof deck. Roof ceiling and floor ceiling construction assemblies which are tested and assigned hourly ratings mandated by building codes or other building safety requirements.

As a designer and installer you should know the fundamental differences between a suspended ceiling which is an integral part of a fire rated floor ceiling or roof ceiling assembly and the far more. Time temperature ratings the third major roof system fire test is astm e 119. In the world trade tower collapse heat load on the connections of steel trusses is suspect. Don t be left hanging understanding how the nec regards suspended ceiling designs and supports is critical for proper design and installation of electrical wiring and equipment.