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FIRE RESISTANCEt.TINGS e FLOOR AND CEILING CONSTRUCTIONS-Continued Fire Resistance Based on Standard Fire Tests e - RESISTANCE RATINGS WALLS AND PARTITIONS-Continued FIRE Ratings e e Tests Based on Standard Fire Ratings Resistance Fire Rating Construction 2Yz in. (minimum thiclatess over cells) reinforced con- crete on top of U.L. listed cellular steel floor units. Ceiling of 1~ in. U.L. listed sprayed fiber on face of adhesive coated metal lath. Lath supported not less than 4Yz in. from underside of steel floor units. Other details as specified in U.L. listinge, under Floor or Roof, and Ceiling Constructions-Design No. 4-3 HR. of Details Type Steel Unitsu, Cellular , J Rating Construction 6 in. hollow tile of medium burned clay, not less than 45% solid, two cells in thiclatess; both sides plastered with % in. 1:3 gypsum and sand plaster. (9, 59)........ not less than % in. gypsum of Details Type Clay Tile 2 hrs.. 6 in. hollow tile of medium burned clay, 30% solid; plastered on both sides with and sand plaster. (9, 59) brs. 3 4 hrs. 4Yz in. (measured from bottom of corrugations) con- crete on top of U.L. listed corrugated steel floor units. Ceiling of 1 in. (measured from face of lath) gypsum- vermiculite plaster on metal lath. Lath supported not less than 14Yz in. from underside of steel floor. Plaster mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft. vermiculite to 100 lbs. gypsum. Other details as specified in U.L. listinge, under Floor or Roof, and Ceiling Constructions-Design No. 7-4 HR. 4Yz in. (measured from bottom of corrugations) ex- panded slag concrete on top of U.L. listed corrugated steel floor. units. Ceiling of ~ in. gypsum-perlite plaster (measured from face of lath attached directly to steel floor units) on metal lath, and sufficient plaster pushed through the lath to fill the corrugations of the steel floor units. Plaster mix: scratch and brown coat 2 cu. ft. U.L. listed perlite to 100 lbs. gypsum. Other details as specified in U.L. listinge, under Floor or Roof, and Ceiling Constructions-Design No. 8-4 HR. Steel Unitsu, Corrugated lYz hrs.. 3 in. hollow tile not less than 500/0 solid, or 4 in. hollow tile not less than 400/0 solid, of medium burned clay; plastered on both sides with % in. 1:3 gypsum and sand plaster. (9, 59) hr.. hr.. 1 1 tile cored not to exceed 47%, plastered on with ~ in. 1:3 gypsum and sand plaster. in. facing back side (30) 4 hr.. hr.. 1 1 :3 in wall thickness plas- 1:3 gypsum and sand 1 :3 ~ in. % in. with side with side each (5) each (9) 4 in. hollow tiie having 2 cells tered each side with Kin. plaster. (9) in. hollow tile plastered gypsum and sand plaster. in. gyp hollow tile plastered sum and sand plaster. 4 6 . . hr.. 1 4Yz in. wall consisting of 3 in. U.L. listed composite blocks, plastered on both sides with ~ in. 1 :1, 1:2 gypsum sand plaster. Other details as specified in U.L. listinge under Walls and Partitions-Design No. 2-3 HR Composite Blocks 4 hrs. 4 hrs. 4Yz in. (measured from bottom of corrugations) lime- stone concrete on top of U.L. listed corrugated steel floor units. Ceiling of ~ in. (measured from the bottom of the corrugations) U.L. listed sprayed fiber applied directly to underside of adhesive coated cor- rugated steel floor units. Other details as specified in U.L. listinge, under Floor or Roof, and Ceiling Constructions-Design No. 9-4 HR. .........-.......,...........,.. 4Yz in. (measured from bottom of corrugations) lime- stone concrete on top of U.L. listed corrugated steel floor units. Ceiling of Yz in. (measured from the bottom of the corrugations) U.L. listed vermiculite acoustical plastic applied directly to underside of cor- rugated steel floor units. Other details as specified in U.L. listinge, under Floor or Roof, and Ceiling Constructions-Design No. 10-4 HR , I . , I Ii I 3 hrs.. 4Yz in. wall consisting of 3 in. U.L. listed composite blocks, (tongue and groove joints-without mortar but with 4 in. strips of metal lath nailed over joints), plastered on both sides with ~ in. plaster. Scratch and brown. coats 3 cu. ft. U.L. listed perlite plaster aggregate to 100 lbs. fibered gypsum. Other de- tails as specified in U.L. listinge under Walls and Partitions-Design No. 4-3 HR 3 hrs.. 2 hrs.. 1 hr.. 3 in. blocks of shredded wood bound with magnesium oxysulfate cement, plastered each side with Yz in. 1:3 gypsum and sand plaster. (9) in. blocks as above, (9) 4 hrs. above. 8 or 12 in. U.L. listed concrete blocks, laid as specified, in U.L. listinge, under Walls and Partitions-Design No. 1-4 HR plastered as 2 Concrete Masonry Units page 47. to notes, Letter superscripts refer 4 hrs.t 8 or 12 in. U.L. listed concrete blocks; cells filled with loose, dry expanded slag and laid as specified in U.L. listinge, under Walls and Partitions-Design No. 1-3 HR or No. 1-2 HR 25 . e 4 hrs.t no members load bearing with noncombustible or page 47. to notes, refer 32 t Rated as wall. Letter superscripts · Nonbearing. framed into