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FIRE RESISTANC~"'TINGS ,e e FIRE IISTANCE FLOOR AND CEILING CONSTRUCTIONS-Continued Fire Resistance Based on Standard Fire RATINGS WALLS AND PARTITIONS-Continued Tests Ratings . . Tests Based on Standard Fire Ratings Resistance Fire ., ... Rating hr. 2 in. concrete floor slabY on metal lath. Ceiling of Yz in. gypsum-perlite plaster, on ~ in. perforated gypsum lath attached to ~ in. furring channels spaced 16 in. on centers, with special wire clips at edges of lath and midpoint of lath width at each channel. Plaster mix: 2Yz cu. ft. perlite to 100 lbs. gypsum. (65) ,.....,. 2 in. concrete slabY on metal lath. Ceiling of ~ in. gypsum-perlite plaster, applied to ~ in. perforated gypsum lath attached to ~ in. furring channels spaced 16 in. on centers, with steel wire clips giving con- tinuous support to lath. Plaster mix: 2Yz cu. ft. perlite to 100 lbs. gypsum. (65) Construction Details of T1Pe Steel Joists (Fabricated from Rolled Sections or from Strip or Sheet Steel) or Steel Beamsu .. " Ratiug Construction 3 in. gypsum plank with tongue and groove joints grouted with gypsum, surfaced one side with 20 gauge corrugated steel panels bolted to gypsum at top and bottom with Yz in. bolts 6 in. on centers. Plank made with 10 per cent wood sawdust, and reinforced with 2 in. wire mesh placed Yz in. from each face. (34) ,....... Details of Type Gypsum Plank Partitions 4 hrs.. 4~ in. gypsum plank with tongue and groove joints grouted with gypsum. Plank cast on 22 gauge cor- rugated (V beam) sheets which form one face. Plank made with 10 per cent wood sawdust, and reinforced with 4 in. wire mesh placed Yz in. from gypsum face. (35) hr. I 2 in. reinforced concrete slab on metal lath. Ceiling of ~ in. U.L. listed wallboardcc, secured to ~ in. furring channels spaced 16 in. on centers, with sheet- metal screws, or to ~ in. nailing channels with 1 ~ in. nails. Joints in wallboard not taped or cemented. Other details as specified in U.L. listingc under Floor and Ceiling Constructions-Design No. 2-1 HR. 4 hrs,. 2 in. gypsum planks with tongue and groove joints grouted with plaster. Planks cast on 22 gauge gal- vanized sheets which form one face, and made with 10% wood sawdust, reinforced with 4 in. wire mesh placed Yz in. from gypsum face. (68) hr. 2 in. reinforced concrete slab on metal lath. Ceiling of ~ in. gypsum-perlite plaster applied to ~ in. U.L. listed perforated gypsum lath attached to ~ in. fur- ring channels spaced 16 in. on centers, with inter- locking wire clips giving continuous support to lath. Abutting ends of lath secured to each other with metal finger clips. Plaster mix: scratch coat and brown coat 2Yz cu. ft. U.L. listed perlite to 100 lbs. fibered gypsum. Other details as specified in U.L. listingc, under Floor or Roof, and Ceiling Construc- tions-Design No. 7-1 HR. . . hr.. 1 in. monolithic wall of U.L. listed cement, steel rein- forced, constructed as specified in U.L. listingc under Walls and Partitions-Design No. 4-4 HR and as de- scribed in detail in U.L. report R 3208 dated July 2, 1951 8 Monolithic Cement 4 hrs. hr. 1 ~ in. wood flooring nailed to wood sleepers on cover- ing of asbestos paper weighing 14 lb. per 100 sq. ft. cemented on sheet steel deck. Ceiling of ~ in. 1 :2, 1:3 gypsum and sand plaster on metal lath. (9) """.. hr. 1 2 in. reinforced vermiculite concrete on steel plate deck. Ceiling of 1 in. gypsum-vermiculite plaster, (measured from face of lath) on metal lath supported at least 7 in. below underside of steel floor plates, and spaced at least 2Yz in. from steel members. Plaster mix: scratch coat 2 to 2Yz cu. ft. and. brown coat 3 to 3Yz cu. ft. U.L. listed vermiculite to 100 lbs. fibered gyp- sum. Other details as specified in U.L. listingc, under Floor or Roof and Ceiling Constructions-Design No. 2-4 HR. Steel Plate Deck on Steel Joists (or Beams)u f 2Yz hrs.. hr.. I 5 in. wall consisting of four layers of Yz in, gypsum wallboardcc applied so that joints in adjacent layers are staggered. lYz in. 18 gauge fluted metal facing sheets with tongue and groove, applied each side of core, and bolted together with ~ in. x 20 bolts. Wall secured to steel angles at floor, wall and ceiling with ~ in. x 20 bolts. (100) ....................,........,...................,...... 3~ in. wall composed of rockwool lined steel panels and a middle layer of asbestos cement boards, secured to steel channels at floor, wall and ceiling. Other de- tails as specified in U.L. listingc, under 'Valls and Partitions-Design No. 8-1 HR. Partition Panel Units ;. '" I 4 hrs. 2Yz in. concrete on steel plate deck. Ceiling of 1 in. gypsum-vermiculite plaster proportioned within the range of 3Yz to 5Yz cu. ft. vermiculite per 100 lb. gypsum on metal lath. (9) 4 hrs. in. concrete on steel plate deck. Ceiling of 2 in. re- inforced gypsum tile with Yz in. 1:3 gypsum and sand plaster. Tile clipped to channels which are clipped to joists. (9) 2 8 in. hollow units of expanded slag concrete, 52% solid, minimum wall and web thicknesses 1 Yz in., unplas- teredo Units laid vertically on lintel with flange of ring anchors in center groove of units at the joints on the lintel. 3 in. paper tubing set on top of ring anchors and pressed into joint. Joints grouted to paper tubing. ~ in. horizontal reinforcing rod in- serted through the exposed section of ring anchors and tied in place. Floor strap anchors tied to rein- forcing rod. All steel covered with concrete. (98) Precast Concrete Wall Sections 4 hrs. 4 hrs. page 47. to notes, refer 21 Letter superscripts e e page 47. refer to notes, 36 Letter superscripts · N onbearing.