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.
1 hour rated roof.
Ibc table 722 6 2 2 allows 10 minutes for wood floor or roof joists at 16 o c.
Base layer attached with 1 25 mm type s 12 corrosion resistant bugle head screws 8 203 mm o c.
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.
Two layers 5 8 15 9 mm densglass fireguard sheathing applied vertically to min.
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.
Customer service sales 1 800 950 3839 technical support 1 800 usg 4you product safety hotline 1 800 507 8899.
3 1 2 89 mm corrosion resistant 20 gauge 30 mils steel studs 24 610 mm o c.
Last 1 hour before ignition.
Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.
6 usg fire resistant assemblies test certiļ¬cation 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.
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.
12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr.
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.
No minimum joist size is given except that it needs to be adequate for structural loads.
Class c roofing provides only light fire protection.
Ibc section 722 6 could be used to calculate up to a 1 hour rating for a wood frame wall floor or roof assembly.
The roof panel construction must have a 1 hour fire rating and shall be non combustible.
Experience maximum flame spread of 13 feet.
A similar section exists for ibc 2015.
A recent building official stated.
Roofing with a class c rating is able to.
3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete.
Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits.
Concrete with cellular steel 3 hr.
Gypsum wallboard roof ceilings wood framing pitched roof truss 11 1 hr.
