Roof Cieling Fire Rating

Rating of partitions floor ceiling assemblies roof ceiling assemblies beams and columns.

Roof cieling fire rating.

As explained there these ratings are applied to certain types of roof ceiling and floor ceiling construction assemblies which are tested and assigned hourly ratings mandated by building codes or other building safety requirements. Fire tests may be conducted at any one of several recognized facilities. Floor ceiling and roof ceiling systems were fire tested at less than 36 inches total depth. 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.

Ul p533 roof ceiling one layer 5 8 15 9 mm fire shield c ga rc 2603 wallboard attached to 1 2 12 7 mm resilient furring. Urb concealed grid system and tile. Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr. The slope of the test specimen is preselected and since steeper slopes are more of a challenge due to melting material feeding the fire the rating applies to the maximum slope passed.

However the total depth of the systems with either directly attached or suspended ceiling membranes shall be permitted to extend greater than 36 inches. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. As applied to 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. If you are unfamiliar with ul fire resistance ratings begin with a review of meeting code requirements pg.

Helpful documents and resources for usg s roof assemblies can be found on this page. 276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. Rating also applies with 5 8 15 9 mm fire shield c kal kore plaster base. 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.

Concrete with cellular steel 3 hr. We must emphasize however that individual roof components are not rated at all. 15 9 mm t g plywood floor sheathing. 3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete.

Roofing systems are rated by realistic fire tests. Both ul and ga include specific guidance regarding the use of insulation in assemblies. Fire resistance ratings represent the results of tests on assemblies made up of specific materials in a specific configuration.