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<br />1~ hrs.
<br />1~ hrs.
<br />lY.i hrs.
<br />1 hr.
<br />1 hr.
<br />1 hr.
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<br />FIRE RESISTANCE"-TINGS
<br />FLOOR AND CEILING CONSTRUCTIONS-Continued
<br />Fire Resistance Ratings Based on Standard Fire Tests
<br />:
<br />Details of Construction Ratiol
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<br />FIRE IISTANCE
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<br />..... .....
<br />
<br />Wood floor consisting of 1 in. (nominal) tongue and
<br />groove sub and finish flooring, with building paper
<br />between. Ceiling of ~ in. gypsum-perlite plaster on
<br />~ in. plain gypsum lath nailed to joists with 1~ in.
<br />nails having ~ in. diameter heads. Plaster rein-
<br />forced with 1 in. mesh wire fabric nailed to joists
<br />through lath, with 2~ in. nails having ~ in. diameter
<br />heads. Plaster mix: scratch and brown coats, 2~
<br />cu. ft. perlite to 100 Ibs. fibered gypsum. (51) .'...,......
<br />
<br />Wood floor consisting of 1 in. (nominal) tongue and
<br />groove sub and finish flooring with building paper
<br />between. Ceiling of :r.'. in. gypsum-vermiculite plaster
<br />on metal lath nailed to joists with lY.i in. barbed
<br />roofing nails, having 7/16 in. heads and spaced 4:r.'. in.
<br />on centers. Plaster applied with sufficient pressure to
<br />form large keys on back of lath. Plaster mix: scratch
<br />coat 2 cu. ft. and brown coat 3 cu. ft. vermiculite to
<br />100 Ibs. fibered gypsum. (58) ..'".,.............."...,...."",......
<br />
<br />Wood floor consisting of 1 in. (nominal) tongue and
<br />groove sub and finish flooring with building paper
<br />between. Ceiling of :r.'. in. gypsum-perlite plaster on
<br />metal lath nailed to joists with 1~ in. barbed roofing
<br />nails having 7/16 in. heads and spaced 4:r.'. in. on
<br />centers. Plaster applied with sufficient pressure to
<br />form large keys on back of lath. Plaster mix: scratch
<br />coat 2 cu. ft. and brown coat 3 cu. ft. perlite to 100 Ibs.
<br />fibered gypsum. (57) .,.....,......,..""...."."......"".....".....,...',
<br />
<br />Wood floor consisting of 1 in. (nominal) tongue and
<br />groove sub and finish flooring with building paper
<br />between. Ceiling of Y.i in. gypsum-perlite plaster on
<br />~ in. perforated gypsum lath, nailed to joists with
<br />1 3/16 in. nails having 9/32 in. diameter heads. Plaster
<br />mix: scratch and brown coats 2~ cu. ft. perlite to
<br />100 Ibs. fibered gypsum. (52) ."",..........,.'"""",..,......"".
<br />
<br />Wood floor consisting of 1 in. (nominal) tongue and
<br />groove sub and finish flooring with building paper
<br />between. Ceiling of two layers Y.i in. gypsum wall-
<br />board with 1 in. mesh wire fabric between. First
<br />layer of wallboard nailed with 1% in. nails having
<br />7/32 in. heads; wire fabric and second layer of wall-
<br />board nailed with 2~ in. nails having ~ in. heads.
<br />Outside joints taped and pointed; nailheads covered
<br />with joint cement. (53) ,..........,..,.".",..,....,........,...,.....,.....
<br />
<br />Wood floor consisting of 1 in. (nominal) tongue and
<br />groove sub and finish flooring with building paper
<br />between. Ceiling of % in. U.L. listed wallboardcc
<br />nailed with 1~ in. nails, 6 in. on centers. Joints
<br />covered with fiber tape and joint finisher. Other
<br />details as specified in U.L. Iistinge, under Floor or
<br />Roof, and Ceiling Constructions-Design No. 1-1 HR.
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