b'Fire Rated Assemblies Fire Rated AssembliesFloor/Ceiling Assembliescontinued Horizontal Membrane SystemsRating Detail UL/GA # Description Sound Rating Rating Detail UL/GA # Description Sound Rating3 hr. G512 7/8 hat channel attached to open web steel joists spaced 24o/c, with onen/a 1 hr. I501 Steel studs, 6, 33 mil (0.0329, 20ga.), are spaced horizontal 16o/c andn/aFC 3012 layer of5/8 FireBloc Type C wallboard applied at right to channels. SteelHM 7100 attached to perimeter channels, with three layers of 5/8 FireBloc Type X joists supporting 3/8 metal rib lath and minimum 2-1/2 concrete. wallboard applied perpendicular to the underside of the studs. Maximum horizontal span is 98-1/4, and assembly is re rated from either direction.1 hr. I504 Steel studs, 6, 33 mil (0.0329, 20ga.), are spaced horizontal 16o/c andn/aHM 7102 attachedtoperimeterchannels.Hangerwire(8ga.)attached/tiedto perimeterchannels24o/c,withthreelayersof5/8FireBlocTypeX Roof/Ceiling Assemblies wallboard applied perpendicular to the underside of the studs.Rating Detail UL/GA # Description Sound Rating2 hr. I502 Steel studs, 6, 33 mil (0.0329, 20ga.), are spaced horizontal 16o/c andn/aResilient channels attached 12"o/c. perpendicular to bottom of wood roofHM 7200 attached to perimeter channels, with three layers of 5/8 FireBloc Type X 1 hr. P545 trusses. One layer 5/8" FireBloc Type C wallboard applied at right angles ton/a wallboard applied perpendicular to the underside of the studs. Two layers of P544 resilient channels. No limit on overall thickness of berglass, loose ll or1-1/2 mineral ber insulation is laid on top side of steel studs. Maximum P554 mineral ber insulation applied directly over gypsum board. Optional ceilinghorizontal span is 98-1/4, and assembly is re rated from either direction.P556 dampers are available.RC 2612 2 hr. I505 Steel studs, 6, 33 mil (0.0329, 20ga.), are spaced horizontal 16o/c andn/aHM 7203 attachedtoperimeterchannels.Hangerwire(8ga.)attached/tiedto perimeterchannels24o/c,withthreelayersof5/8FireBlocTypeX 5/8 FireBloc Type C wallboard is attached perpendicular to traditional roofwallboard applied perpendicular to the underside of the studs. Two layers of 2 hr. P571 trusses spaced a maximum of 24o/c. Resilient furring channels spacedn/a 1-1/2 mineral ber insulation is laid on top side of steel studs.RC 2756 16o/c are fastened to the trusses, with two (2) additional layers of 5/8 FireBloc Type C wallboard secured to the furring members. Fiberglass,2 hr. K506 Steel studs, 6, 33 mil (0.0329, 20ga.), are spaced horizontal 24o/c andn/amineral wool, or loose-ll insulation applied directly over gypsum board. attached to perimeter channels, with three layers of 5/8 FireBloc Type C HM 7202 wallboard applied perpendicular to the underside of the studs. Resilient furring channels are then attached to steel studs 16o/c, with one additional layer of 5/8 FireBloc Type C wallboard applied perpendicular to the furring channels.1 hr. P550 Resilient channels attached at 12o/c to bottom cord of pitched or paralleln/aRC 2502 chord steel trusses spaced 48o/c, with one layer of 5/8 FireBloc Type C1.800.545.6302|americangypsum.comwallboard applied at right angles to channels. Roof trusses supporting metal roof deck panels covered by 1/2 or 5/8 cement backer board or 1/2 regular gypsum sheathing either loose laid, or adhesively/mechanically attached to roof deck. There is no limit on overall thickness of berglass, loose ll or mineral wool insulation allowed when applied directly over gypsum board.2 hr. P550 Resilient channels attached at 12o/c to bottom cord of pitched or paralleln/aRC 2753 chord steel trusses spaced 48o/c, with two layers of 5/8 FireBloc Type C wallboard applied at right angles to channels. Roof trusses supporting metal roof deck panels covered by 1/2 or 5/8 cement backer board or 1/2 regular gypsum sheathing either loose laid, or adhesively/mechanically attached to roof deck. There is no limit on overall thickness of berglass, loose ll or mineral wool insulation allowed when applied directly over gypsum board.2 hr. P551 Resilient channels attached at 12o/c to bottom cord of pitched or paralleln/aRC 2504 chord steel trusses spaced 48o/c, with two layers of 5/8 FireBloc Type X wallboard applied at right angles to channels. Roof trusses supporting metal roof panels. There is no limit on overall thickness of berglass, loose ll or mineral wool insulation allowed when applied directly over gypsum board.'