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<br />Ratinc
<br />-
<br />3 hrs.
<br />3 hrs.
<br />3 brs.
<br />3 hrs.
<br />3 brs.
<br />2~ hrs.
<br />2~ hrs.
<br />2~ hrs.
<br />
<br />2% in. reinforced gypsum concrete on :Ji in. gypsum
<br />plaster board supported by joists of which the lower
<br />% is encased in precast gypsum and the upper ~ ex-
<br />tends into the floor slab; 1 in, minimum fireproofing
<br />on joists. Ceiling of ~ in. 1:1 gypsum and sand
<br />plaster on metal lath. (22) ."..........,.,...,...,."....'"""........"
<br />2 in. concrete slabY on metal lath. Ceiling of ~ in.
<br />gypsum-perlite plaster, on :Ji in. perforated gyp-
<br />sum lath attached to ~ in. furring channels spaced
<br />16 in. on centers, with special wire clips giving con-
<br />tinuous support to lath. Plaster reinforced with wire
<br />mesh. Wire mesh attached to furring channels at
<br />joints in lath. Plaster mix: 2~ cu. ft. perlite to
<br />100 Ibs. gypsum. (65) .................."..........".,......................
<br />2 jn. concrete slabY on metal lath. Ceiling of % in.
<br />gypsum-perlite plaster on ~ in. perforated gyp-
<br />sum lath attached to ~ in. furring channels spaced
<br />12 in. on centers, with interlocking wire clips giving
<br />continuous support to lath. Plaster reinforced with
<br />14 gauge galvanized wire secured diagonally to clips
<br />or channels at each intersection. Plaster mix: scratch
<br />coat 2 cu. ft. and brown coat 3 cu. ft. perlite to 100 Ibs.
<br />gypsum. ( 65) ......................,...........,.,...................................
<br />2 in. concrete floor slabY on metal lath. Ceiling of %
<br />in. g}'psum perlite plaster on :Ji in. perforated gypsum
<br />lath attached to ~ in. furring channels spaced 12 in.
<br />on centers with special wire clips at edges of lath
<br />and third points of lath width at each channel. Plaster
<br />mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft.
<br />to 100 Ibs. gypsum. (65) ................................................,...
<br />2~ in. perlite concrete slabY on paper-backed wire
<br />fabric. Ceiling of ~ in. gypsum perlite plaster (meas-
<br />ured from face of lath) on metal lath secured to joists
<br />with wire clips. Plaster mix: scratch coat 2 cu. ft.
<br />and brown coat 3 cu. ft. U.L. listed perlite to 100 Ibs.
<br />fibered gypsum. Other details as specified in U.L.
<br />listing<:, under Floor or Roof, and Ceiling Construc-
<br />tions-Design No. 6-3 HR. ".....,'...........,............',.,.......
<br />2~ in. concrete slabY on metal lath. Ceiling: 1 in.
<br />sprayed asbestos fiber on metal lath. (33) .............,......
<br />2 in. concrete floor slabY on metal lath, or 2 in. rein-
<br />forced gypsum tile covered with 34 in. mortar, on
<br />joists. Ceiling of 1 in. unsanded wood-fibered gypsum
<br />plaster, or ~ in. gypsum-vermiculite plaster propor-
<br />tioned within the range ot 3~ to 5~ cu. ft. ver-
<br />miculite per 100 lb. gypsum, on metal lath. (9) ",.......
<br />2 in. concrete slabY on metal lath. Ceiling of ~ in.
<br />gypsum-perlite plaster applied to ~ in. perforated
<br />gypsum lath secured to ~ in. furring channels spaced
<br />16 in. on centers, with interlocking wire clips giving
<br />continuous support to lath. 14 gauge galvanized wire
<br />secured diagonally to clips or channels at each int~r-
<br />section. Plaster mix: 2~ cu. ft. perlite to 100 Ibs.
<br />gypsum. (65)
<br />
<br />FIRE RESISTANCE i.INGS
<br />
<br />FLOOR AND CEILING CONSTRUCTIONS-Continued
<br />Fire Resistance Ratings Based on Standard Fire Tests
<br />
<br />Construction
<br />
<br />of
<br />
<br />Details
<br />
<br />Steel
<br />Joists
<br />(Fabricated
<br />from Rolled
<br />Sections or
<br />from Strip
<br />or Sheet
<br />Steel) or
<br />Steel
<br />Beamsn
<br />
<br />Type
<br />
<br />e
<br />
<br />.
<br />
<br />"
<br />I
<br />.
<br />.
<br />"i
<br />
<br />~
<br />
<br />e
<br />
<br />.
<br />
<br /> -
<br /> FIRE RESISTANCE RATINGS
<br /> WALLS AND PARTITIONS-Continued
<br /> Fire Resistance Ratings Based on Standard Fire Tests
<br /> :
<br />Type Details of Construction I Ratil18'
<br />-
<br />Solid 1~ in. minimum total thickness consisting of 1 in. U.L.
<br />Gypsum listed, laminated gypsum coreboard erected vertically
<br />Board and set in floor and ceiling runners made of 20 gauge
<br />Partitions sheet metal. Vertical joints of coreboard butted and
<br />(Without held with steel tee clips. Outer layer of :Ji in. or
<br />steel ~ in. U.L. listed wallboard applied vertically or hori-
<br />framing) zontally and secured to adhesive coated coreboard.
<br /> Vertical joints in wallboard butted and staggered with
<br /> joints of coreboard. Outside joints covered with tape
<br /> and joint finisher. Other details as specified in U.L.
<br /> listingc, under Walls and Partitions-Design No.
<br /> 9-1 HR. 1 hr..
<br />
<br />'.
<br />
<br />"
<br />"
<br />,
<br />
<br />I
<br />
<br />..
<br />
<br />I
<br />i
<br />f
<br />'Ii
<br />'l
<br />
<br />f
<br />
<br />I:
<br />
<br />.
<br />
<br />brs..
<br />
<br />2 hrs..
<br />2 hrs..
<br />2 hrs..
<br />1~ hrs..
<br />1 hr..
<br />1 hr..
<br />1 hr..
<br />1 hr..
<br />1 hr..
<br />1 hr..
<br />hr.*
<br />
<br />2~
<br />
<br />2 hrs..
<br />
<br />2Ya in. total thickness of neat gypsum plaster on metal
<br />lath attached to ~ in. or 1 in. steel channels. (9) .......,
<br />2~ in. total thickness of gypsum-perlite plaster, on
<br />metal lath attached to ~ in. steel channels. Plaster
<br />, mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft.
<br />U.L. listed perlite plaster aggregate to 100 lbs. fibered
<br />gypsum. Other details as specified in U.L. listing<:
<br />under Walls and Partitions-Design No. 2-2 HR. "....
<br />2~ in. total thickness of gypsum-vermiculite plaster on
<br />metal lath attached to ~ in. steel channels. Plaster
<br />mix: scratch coat 2 cu. ft. and brown coat 3 cu. ft. of
<br />vermiculite to 100 Ibs. gypsum. (79) ........""......,.,.......
<br />2 in. total thickness of unsanded, wood-fibered gypsum
<br />plaster on metal lath on steel studs. (94) ......,...........
<br />2~ in. total thickness of 1 :~, 1:~ gypsum and sand
<br />plaster on metal lath on steel studs. (9) "....,......'"........
<br />2 in. total thickness of 1 :~, 1:~ gypsum and sand
<br />plaster on metal lath attached to ~ in. or 1 in. steel
<br />
<br />channels. (9) ..,..................................",........",.....................
<br />1~ in. gypsum-perlite plaster on metal lath attached to
<br />~ in. steel channels, Plaster mix for scratch and
<br />brown coats 2~ cu. ft. perlite to 100 Ibs. fibered
<br />
<br />gypsum. (66) ...,..............,....""...,.......,......,..."........,',.,.....,....
<br />234 in. total thickness of ~ in. plaster of 86 parts
<br />gypsum, 12 parts sawdust and 2 parts asbestos fiber
<br />each side ~ in. asbestos lath (medium), with sheet-
<br />steel H supports. (7) ""..".........,........,.......,........,....,.......,...
<br />2~ in. total thickness of 1 :2, 1:3 gypsum and sand
<br />plaster on metal lath on steel studs. (7, 9),...........,..",..
<br />2 in. total thickness of 1 :2, 1:2 gypsum and sand
<br />plaster on metal lath on steel studs. (40) ....",..,.....",..,.
<br />2~ in. total thickness of ~ in. 1:1 gypsum and sand
<br />plaster each side of ~ in. gypsum lath; steel stud
<br />
<br />supports. (15) "......,.....,.,..........,......""........,.."...............,.....
<br />2~ in. total thickness of ~ in. 1 :2~ gypsum and sand
<br />plaster each side 1 in. board of shredded wood bound
<br />with magnesium oxysulfate cement, with sheet steel
<br />H supports. (7, 9) .......,."................,..."..."......,...................,.
<br />2 in. total thickness of 1:1 gypsum and sand plaster on
<br />metal lath on steel studs. (9)
<br />
<br />Solid
<br />Plaster
<br />Partitions
<br />(S teel
<br />framing
<br />embedded
<br />in plaster)
<br />
<br />Letter superscripts refer to notes, page 47.
<br />19
<br />
<br />.
<br />
<br />e
<br />
<br />* Nonbearing.
<br />Letter superscripts refer to notes, page 47.
<br />
<br />38
<br />
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