1 Hour Rated Roof

Roofing with a class c rating is able to.

1 hour rated roof. Concrete with cellular steel 3 hr. Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. 3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete.

No minimum joist size is given except that it needs to be adequate for structural loads. In the florida building code 2014 section 1505 1 roof assemblies rated for a fire classification need to be tested to astm e 108 or ul790. Base layer attached with 1 25 mm type s 12 corrosion resistant bugle head screws 8 203 mm o c. A recent building official stated.

A minimum 1 hour fire resistance rating to prevent embers and hot gases from making contact with the joists rafters or trusses or the underside of the roof decking. Ibc section 722 6 could be used to calculate up to a 1 hour rating for a wood frame wall floor or roof assembly. A similar section exists for ibc 2015. Customer service sales 1 800 950 3839 technical support 1 800 usg 4you product safety hotline 1 800 507 8899.

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 channel spaced 12 o c. 3 1 2 89 mm corrosion resistant 20 gauge 30 mils steel studs 24 610 mm o c. The roof panel construction must have a 1 hour fire rating and shall be non combustible. Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.

276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. Urb concealed grid system and tile. 1 hour rating floor or roof 24 oc min 12 depth 2 layers 1 2 type x gypsum sheathing min 15 32 wh tsc fca 45 02 wh tsc fca 45 04 ga fc5512 nominal 2x3 24 oc min 10 depth truswal metal truss plates 1 layer 5 8 type x gypsum sheathing min 3 4 nominal 2x3 24 oc min 10 depth. Class c roofing provides only light fire protection.

Experience maximum flame spread of 13 feet. These listings are short summaries to serve as a. 12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr. Face layer attached with 1 5 8 41 mm type s 12 corrosion resistant bugle head screws spaced 8.

Screw fastened perpendicular to lower chord of wood trusses of 2 x 4 38 mm x 89 mm. 6 usg fire resistant assemblies test certification test conditions and fire and sound tested assemblies listed in this selector are based on characteristics properties and performance certificationof materials and systems obtained under controlled test conditions as set forth in the appropriate astm standard in effect at the time of test. Resist eight cycles of a gas flame turned on and off.