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Ie FIRE RESISTANCE RATINGS ;e e FIRE tSISTANCE FLOOR AND CEILING CONSTRUCTIONS-Continued Resistance Based on Standard Fire . e RATINGS AND PARTITIONS-Continued Based on Standard Fire WALLS Resistance Tests Ratings Fire +' Tests Ratings Fire 4~ in. slab with expanded slag aggregate. t:l tection to steel reinforcement. (62-A) ,.....,..... 6 in. slab with air-cooled slag aggregate. 1 in. pro- tection to steel reinforcement. (62- J) ............................ 5 in. slab with limestone aggregate, with electrical race- ways and junction boxesdd. Ceiling of 1 in. (meas- ured from face of lath) gypsum-vermiculite plaster on metal lath supported from the bottom of the concrete slab. Plaster mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft. U.L. listed vermiculite to 100 lbs. fibered gypsum. (62-K) .....,........,......,.......................,..................,. 3 in. slab with limestone aggregate. Ceiling of 1 in. (measured from face of lath) gypsum-vermiculitll plaster on metal lath supported from the bottom of the concrete slab. Plaster mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft. U.L. listed vermiculite to 100 lbs. fibered gypsum. (62-K) .....,.............................. 4 in. slab with limestone aggregate, with electrical race- ways and junction boxesee. Ceiling of t:l in. (meas- ured from face of lath) gypsum-vermiculite plaster on metal lath supported not less than 11 ~ in. from the bottom of the concrete slab. Plaster mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft. U.L. listed vermiculite to 100 lbs. fibered gypsum. (62-1) 2 in. slab with limestone aggregate. Ceiling of t:l in. (measured from face of lath) gypsum-vermiculite plaster on metal lath supported not less than 13~ in. from the bottom of the concrete slab. Plaster mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft. U.L. listed vermiculite to 100 lbs. fibered gypsum. (62-1) 6 1 in. Rating 4 hrs. 4 hrs. pro- in. Construction of Details Type Reinforced Concreteu -I I Rating Construetion One side sheathed with 1 in. magnesium oxysulphate wood fiber board attached to studs, 1 in. air space, and 3t:l in. brick secured with metal ties to studs every fifth course. Other side faced with ~ in. 1:2 gypsum and sand plaster on metal lath secured directly to studs. (9) of Details Type Steel Stud Brick- Veneered Wallsz 4 hrs. 1 ~ hrs. One side sheathed with ~ in. wood fiberboard sheathing next to studs; t:l in. air space formed with t:l in. by 1% in. wood strips placed over the fiberboard and secured to the studs; paper-backed wire lath nailed to these strips, 3t:l in. brick veneer held in place by filling t:l in. space between brick and paper-backed lath with mortar. Inside facing of t:l in. neat gypsum plaster on metal lath attached to 5/16 in. wood strips secured to edges of the studs. (9) 4 hrs. 1~ hrs. 2 hrs.. plaster on metal gypsum wood-fibered ~ in. unsanded, lath. (7, 9) 1 1 Steel Stud Hollow Partitions, Plastered Finished each side as noted 2 brs.. sand plaster on metal lath. gypsum and :~ ~, in. 1 (9) 3 hrs. . . 2 hrs. t on metal 1}i in. gypsum-perlite plaster on metal lath attached to 4 in. studs, and sufficient plaster pushed through the lath to give an average total thiclmess of 1% in. Plaster mix for scratch and brown coats, 100 lbs. fibered gypsum to 3.7 cu. ft. perlite. (70) plaster gypsum wood-fibered in. unsanded, lath. (7, 9) 3 hrs. 2 hrs.. 1~ in. gypsum-perlite plaster on metal lath attached to 4 in. studs, and sufficient plaster pushed through the lath to give an average total thiclmess of 1~ in. Plaster mix for scratch and brown coats, 100 lbs. fibered gypsum to 4 cu. ft. perlite. (71)......,... protection in. slab with traprock aggregate. to steel reinforcement. (62-L) 3 hrs. 3 hrs. pro- in. in. slab with crushed limestone aggregate. tection to steel reinforcement. (62-B) 6 3 hrs. pro- 1 in. slab with calcareous gravel aggregate. tection to steel reinforcement. (62-C) 6 3 hrs. pro- in 1 aggregate.. (62-D) in. slab with siliceous gravel tection to steel reinforcement. 6 2~ hrs. pro- in. t:l 4t:l in. slab with air-cooled sl~g aggregate. tection to steel reinforcement (62-M) I 'I ~. ~ f 2 hrs.. in. gypsum-perlite plaster on metal lath attached to 4 in. studs, and sufficient plaster pushed through the lath to give an average total thickness of 1~ in. Plaster mix for scratch and brown coats, 100 lbs. fibered gypsum to 3.75 cu. ft. perlite. (73)". 2 brs.. in. (measured from face of lath) gypsum-perlite plaster, on metal lath attached to 4 in. studs. Plaster mix: scratch coat 2 cu. ft. and brown 3 cu. ft. of per- lite to 100 lbs. fibered gypsum. (55) 1 2 hrs. t:l in. protec- 4t:l in. slab with trap rock aggregate. tion to steel reinforcement. (62-E) 2 brs.. wood-fibered gypsum plaster on metal t:l in. unsanded, lath. (7, 9) 1 2 hrs. pro- in. 1 4t:l in. slab with calcareous gravel aggregate. tection to steel reinforcement. (62-F) 2 hrs. in. 1 4t:l in. slab with crushed limestone aggregate. protection to steel reinforcement. (62-G) ......., 4t:l in. slab with siliceous gravel aggregate.. protection to steel reinforcement. (62-H) 2 brs. in. t:l br. 1 pro- t:l page 47. in. slab with siliceous gravel aggregate. tection to steel reinforcement. (33) to notes, Letter superscripts refer 17 4 . 1~ hrs. metal 1~ hrs.. on sand plaster and gypsum :~ 1:~, (9) ~ in. lath. of in. loaded not to exceed 5,120 lbs. per sq. · Nonbearing. t For partitions stud area the rating is 2~ hrs. Letter - page 47. refer to notes, 40 superscripts