Roof Cieling Fire Rating

15 9 mm t g plywood floor sheathing.

Roof cieling fire rating.

Both ul and ga include specific guidance regarding the use of insulation in assemblies. 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. 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. We must emphasize however that individual roof components are not rated at all.

Urb concealed grid system and tile. 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. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels.

Floor ceiling and roof ceiling systems were fire tested at less than 36 inches total depth. If you are unfamiliar with ul fire resistance ratings begin with a review of meeting code requirements pg. 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. Fire resistance ratings represent the results of tests on assemblies made up of specific materials in a specific configuration.

Roofing systems are rated by realistic fire tests. 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. Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr. 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. Rating of partitions floor ceiling assemblies roof ceiling assemblies beams and columns. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. Helpful documents and resources for usg s roof assemblies can be found on this page.

However the total depth of the systems with either directly attached or suspended ceiling membranes shall be permitted to extend greater than 36 inches. Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance. Concrete with cellular steel 3 hr.