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<br /> e e e FIRE RESISTANCE tTINGS
<br /> FIRE RESISTANCE RATINGS
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<br /> FLOOR AND CEILING CONSTRUCTIONS-Continued FLOOR AND CEILING CONSTRUCTIONS-Continued
<br /> Fire Resistance Ratings Based on Standard Fire Tests e . Estimated Ratings
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<br />Type Details of Construction I Rating .~ Type I Details of Construction I Ratinl
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<br />Wood Wood floor consisting of ~ in. sub-floor and tongue ,~ Reinforced 2~ in. reinforced'" concrete floor slab on joists. Ceiling
<br />Joists and groove finish flooring with asbestos paper weigh- Concrete of 1 in. unsanded, wood-fibered gypsum plaster, or
<br /> ing 14 lb. per 100 sq. ft. between. Ceiling of ~ in. 1:2 Joists ~ in. gypsum-perlite or gypsum-vermiculite plaster
<br /> gypsum and sand plaster on ~ in. perforated gypsum (Not over on metal lath. Plaster mix: scratch coat 2 to 2~
<br /> lath attached by 1~ in. nails with ~ in. heads and 30 in. on cu. ft. and brown coat 3 to 334 cu. ft. perlite or
<br /> spaced 4 in. on centers; 3 in. strips of expanded metal centers) vermiculite to 100 Ibs. gypsum. .....,"'..,"'.......,..',............." 3 brs.
<br /> lath nailed over all joints in gypsum lath using 1~ 2~ in. reinforced'" concrete floor slab on joists. Ceiling
<br /> in. nails with ~ in. heads spaced 5 in. on centers
<br /> along joists and with 2 nails to each joist for joints of ~ in. 1 :2, 1:3 gypsum and sand plaster on metal 2 hrs.
<br /> perpendicular to joists. (9) "........",.,"""""'.."..,.,........... 1 hr. lath. ..............................................n...................................................................._......
<br /> Double * in. tongue and groove wood flooring with Steel Joists 2~ in. concrete or gypsum slab on metal lath. Ceiling
<br /> insulating layer between. Ceiling of ~ in. 2:1 wood- (Fabricated of * in. 1:2 gypsum and sand plaster on metal or
<br /> fibered gypsum and sand plaster on ~ in. plain gyp- from Rolled wire lath. "............,...,'.............,..................................,.......",... 2~ hrs.
<br /> sum plaster base attached by 1~ in. nails with 7/16 Sections or
<br /> in. heads, 12 to each 16 x 48 in. lath; 3 in. strips from Strip
<br /> expanded metal lath nailed over all joints in gypsum 1 hr. or Sheet
<br /> lath. (25) ........",.".........,..",.".......""",.........."....,..,.""......... Steel) or
<br /> Wood floor consisting of ~ in. sub-floor and tongue and Steel
<br /> groove finish flooring with asbestos paper weighing Beamsu
<br /> 14 Ibs. per 100 sq. ft. between. Ceiling of ~ in. 1 :2, -
<br /> 1:3 gypsum and sand plaster on metal lath nailed
<br /> with 1~ in. No. 11 gauge barbed roofers' nails hav- 1 hr.
<br /> ing 7/16 in. heads and spaced 6 in. on centers. (9) ......
<br /> Wood floor consisting of ~ in. sub-floor and tongue and . I'
<br /> groove finish flooring with asbestos paper weighing
<br /> 14 Ibs. per 100 sq. ft. between. Ceiling of ~ in. 1 :2,
<br /> 1:3 portland cement and sand plaster with 3 lb. ROOF CONSTRUCTIONS
<br /> asbestos fiber and 15 Ibs. hydrated lime added per Fire Resistance Ratings Based on Standard Fire Tests
<br /> 94-lb. bag of cement, on metal lath nailed with 1 ~ in.
<br /> No. 11 gauge barbed roofers' nails having 7/16 in. I I
<br /> heads and spaced 6 in. on centers. (9) .....,'................,.", 1 hr.
<br /> Type Details of Construction Ratinl
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<br /> Steel 3 in. U.L. listed reinforced vermiculite concrete on
<br /> Estimated Ratings ! Unitsu, ribbed steel floor units. Other details as specified
<br /> Ribbed in U.L. Iistingc, under Floor or Roof, and Ceiling
<br /> Ii Constructions-Design No. 1-134 HR. .............,............ 1~ hrs
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<br />Brick Minimum depth 4 in. for spanSl of 5 ft. or less; rise at '11
<br />Arch least 1 in. per ft. of span; at least 2 in. concrete fill ' ' Same as
<br /> : f.,. . Any construction described under "Floor and Ceiling Floor
<br /> on top of arch; ceiling plastered with ~ in. portland !./
<br /> cement or gypsum plaster (23) ..,.............,._........___ 3 hrs. Constructions." ....".....,."......"...."._.._..",....."".... Rating
<br /> Minimum depth 8 in.; rise at least 1 in. per ft. of span.
<br /> (23) ",.,.,....,......",.."",....",..",.",........,."."......""...,.........."...,. 3 hrs. Letter superscripts refer to notes, page 47.
<br />Hollow Minimum depth 6 in. with at least 2 cells in the depth j
<br />Clay Tile shells and webs not less than ~ in. in thickness;
<br />Arch vertical and horizontal dimension of cells not greater
<br /> than 4 in.; at least 2 in. concrete fill on top of arch;
<br /> ceiling plastered with ~ in. portland cement or gyp_
<br /> IIUIII plallh:r. (24) .......",.........,....,......................,.. 3 on.
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<br /> Letter superscripts refer to notes, page 47. ' .
<br /> 28 29
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