Fire Rated Roof Ceiling Assemblies

12 x 24 2 x 4 8 w10 x 25 beam floor units and beam support 3 hr.

Fire rated roof ceiling assemblies. No ceiling or suspension system product alone constitutes a fire rated assembly. 276 fire rated ceiling assemblies suspension ceiling designs floor ceiling designs a003 3 hr. Roof ceiling assemblies ceiling system lighting hvac outlets and other penetrants through the ceiling the plenum roof support structure and roof assembly including deck insulation and roofing system. For occupancies such as stores apartments of fices and other commercial and industrial uses build ing codes commonly require floor ceiling and wall assemblies to be fire resistance rated in accordance with standard fire tests.

Two types of fire rated construction assemblies pertain to acoustical ceiling systems. Fire safety caution passing a fire test in a controlled laboratory setting and or certifying or labeling a product as having a one hour two hour or any other fire resistance or protection rating and therefore as acceptable for use in certain fire rated assemblies systems does not mean that either a particular assembly system. Roof ceiling 1 hour 2 x 4 1 1 2 wide wood web trusses 24 o c 5 8 t g plywood r 30 fiberglass insulation 1 1 2 x 25 gauge hat channel w 1 layer 1 2 sheet rock. Roof ceiling and floor ceiling construction assemblies which are tested and assigned hourly ratings mandated by building codes or other building safety requirements.

Fire partitions must extend from the top of the floor below to the underside of the floor or roof sheathing or to the underside of the fire resistance rated floor ceiling or roof ceiling assembly above. You can use only the specific type size and. Ul tests rate an entire assembly. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels.

Urb concealed grid system and tile. 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. Openings penetrations joints and duct air openings must be protected. 3 4 fr 83 12 x 12 z runners fluorescent type none 2 1 2 concrete.

However floor ceiling designs that specify a finish floor are typically not used as roof ceiling assemblies. Concrete with cellular steel 3 hr. Helpful documents and resources for usg s roof assemblies can be found on this page. 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.