Roof Cieling Fire Rating

Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance.

Roof cieling fire rating.

Rating of partitions floor ceiling assemblies roof ceiling assemblies beams and columns. Fire tests may be conducted at any one of several recognized facilities. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. Both ul and ga include specific guidance regarding the use of insulation in assemblies.

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. 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. 15 9 mm t g plywood floor sheathing. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.

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. We must emphasize however that individual roof components are not rated at all. 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. Floor ceiling and roof ceiling systems were fire tested at less than 36 inches total depth.

Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr. 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. Helpful documents and resources for usg s roof assemblies can be found on this page. Rating also applies with 5 8 15 9 mm fire shield c kal kore plaster base.

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. 276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. Roofing systems are rated by realistic fire tests. If you are unfamiliar with ul fire resistance ratings begin with a review of meeting code requirements pg.

Urb concealed grid system and tile. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr. Fire resistance ratings represent the results of tests on assemblies made up of specific materials in a specific configuration.