Roof Cieling Fire Rating

We must emphasize however that individual roof components are not rated at all.

Roof cieling fire rating.

The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. Helpful documents and resources for usg s roof assemblies can be found on this page. Concrete with cellular steel 3 hr. 276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr.

However the total depth of the systems with either directly attached or suspended ceiling membranes shall be permitted to extend greater than 36 inches. Urb concealed grid system and tile. Rating of partitions floor ceiling assemblies roof ceiling assemblies beams and columns. Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance.

Floor ceiling and roof ceiling systems were fire tested at less than 36 inches total depth. Fire resistance ratings represent the results of tests on assemblies made up of specific materials in a specific configuration. Both ul and ga include specific guidance regarding the use of insulation in assemblies. Rating also applies with 5 8 15 9 mm fire shield c kal kore plaster base.

Roofing systems are rated by realistic fire tests. 15 9 mm t g plywood floor sheathing. 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.

3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete. 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. 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. 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. If you are unfamiliar with ul fire resistance ratings begin with a review of meeting code requirements pg. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr.