However floor ceiling designs that specify a finish floor are typically not used as roof ceiling assemblies.
Roof ceiling assemblies.
Additional layers of gypsum board are permitted to be added to any assembly.
Helpful documents and resources for usg s roof assemblies can be found on this page.
Fire resistance assembly rating.
Urb concealed grid system and tile.
276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr.
N beam designs for floor ceiling assemblies p roof ceiling designs s beam designs for roof ceiling assemblies u or v wall and partition designs x or y column designs ii.
12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr.
These listings are short summaries to serve as a.
Channels spaced 12 305 mm o c.
Ibc item 4 or item 5 would allow use of assemblies tested as floor ceiling or roof ceiling in the other application even if not specified as such in the listing based upon rational design provided to the building official.
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.
When insulation is used or.
These ratings are based on astm standards and compliance is determined by several independent non government testing services such as underwriters laboratories inc.
Concrete with cellular steel 3 hr.
Floor ceiling or roof ceiling assembly is permitted provided that one additional layer of gypsum board of the same type specified in the design is added to the ceiling.
Fire partitions shall extend from the top of the foundation or floor ceiling assembly below to the underside of the floor or roof sheathing slab or deck above or to the fire resistance rated floor ceiling or roof ceiling assembly above and shall be securely attached thereto.
Ul tests rate an entire assembly.
3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete.
Roof ceiling and floor ceiling construction assemblies which are tested and assigned hourly ratings mandated by building codes or other building safety requirements.
General the following information is applicable to all fire resistive designs described in this directory.
Roof ceiling steel framed one layer 5 8 15 9 mm toughrock fireguard c gypsum board or 5 8 15 9 mm densarmor plus fireguard c gypsum panels applied at right angles to resilient or rigid furring channels with 1 25 4 mm type s drywall screws 12 305 mm o c.
Two types of fire rated construction assemblies pertain to acoustical ceiling systems.
Stud sizes specified in wood or steel stud assemblies are minimums.
