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<br /> ,_
<br /> FIRE RESISTANCE RATINGS
<br /> FLOOR AND CEILING CONSTRUCTIONS-Continued
<br /> Fire Resistance Ratings Based on Standard Fire Tests
<br /> =
<br />Type Details of Construction Rating
<br />
<br />e
<br />
<br />_
<br />
<br />FIRE IISTANCE
<br />
<br />.
<br />
<br />e
<br />
<br />Tests
<br />
<br />RATINGS
<br />
<br />AND PARTITIONS-Continued
<br />on Standard Fire
<br />
<br />Based
<br />
<br />Ratings
<br />
<br />WALLS
<br />
<br />Resistance
<br />
<br />Fire
<br />
<br />')
<br />
<br />4 hI's.
<br />
<br />4 hI's.
<br />
<br />4 hI's.
<br />
<br />4 hI's.
<br />
<br />4 hI's.
<br />
<br />2~ in. (minimum thickness over cells) crushed lime-
<br />stone concrete on top of D.L. listed cel1ular steel
<br />floor units. Ceiling of 1)4 in. D.L. listed sprayed
<br />fiber applied directly to underside of steel floor units
<br />with web area between cells coated with adhesive.
<br />Other details as specified in D.L. listingc, under
<br />Floor or Roof, and Ceiling Constructions-Design
<br />No. 13-4 HR, or No. 14-4 HR. ,..,....."...........,...............
<br />
<br />2~ in. (minimum thickness over cells) limestone con-
<br />crete on top of D.L. listed cel1ular steel floor units.
<br />Ceiling of 1~ in. D.L. listed sprayed fiber applied
<br />directly to wlderside of adhesive coated cellular steel
<br />units. Other details as specified in D.L. listing",
<br />under Floor or Roof, and Ceiling Constructions-
<br />Design No. 11-4 HR. ......',..........................................m.....
<br />
<br />2~ in. (minimum thiclmess over cells) concrete on top
<br />of U.L. listed cellular steel floor units. Ceiling of
<br />1~ in. (measured from face of lath) plaster consisting
<br />of % in. gypsum-vermiculite plaster and ~ in. ver-
<br />miculite acoustical plastic on metal lath. Lath sup-
<br />ported not less than 7)4 in. from underside of steel
<br />floor units. Plaster mix: scratch coat 2 to 2~ cu. ft.
<br />and brown coat 3 to 3~ cu. ft. U.L. listed vermicu-
<br />lite to 100 lbs. fibered gypsum. Other details as speci-
<br />fied in U.L. listingc, under Floor or Roof, and Ceiling
<br />Constructions-Design No. 4-4 HR. ,................"...........
<br />
<br />2 in. reinforced concrete on top of U.L. listed cellular
<br />steel floor units. Ceiling of % in. (measured from
<br />face of lath) gypsum-perlite plaster on metal lath.
<br />Plaster mix: scratch coat 2 cu. ft. and brown coat
<br />3 cu. ft. U.L. listed perlite to 100 lbs. fibered gypsum.
<br />Lath supported not less than 15~ in. from underside
<br />of steel floor, and spaced at least 3~ in. below steel
<br />beams. Duct opening in ceiling not larger than 70
<br />sq. in. in each 100 sq. ft. ceiling area, protected by
<br />fire damper of No. 12 USS gauge steel covered with
<br />two 1/32 in. thick layers of asbestos paper. Also No.
<br />12 USS gauge steel fire damper at junction between
<br />branch duct and main duct. Not more than one elec-
<br />trical outlet in each 90 sq. ft. ceiling area. Duct loca-
<br />tion, and other details as specified in U.L. listing",
<br />under Floor or Roof, and Ceiling Constructions-
<br />Design No. 5-4 HR. ....,................................,...................,
<br />
<br />2 in. (minimum thiclmess over cells) concrete on top of
<br />U.L. listed cellular steel floor units. Ceiling of 1~ in.
<br />U.L. listed sprayed fiber on metal lath. Lath sup-
<br />ported not less than 4~ in. from underside of steel
<br />floor. Other details as specified in U.L. listing", under
<br />Floor or Roof, and Ceiling Constructions-Design
<br />
<br />N9. 6-4 HR. ..,............,'....................,..............."..................,
<br />1~ in. concrete plus ~ in. cement mortar finish, on top
<br />of cellular steel units. Ceiling of 1 in. gypsum-vermicu-
<br />lite plaster proportioned within the range of 3~ to
<br />5~ cu. ft. vermiculite per 100 lb. gypsum, on metal
<br />lath secured not le~s than 2 in. below bottom of
<br />cellular steel units. (9)
<br />
<br />Steel
<br />Unitsu,
<br />Cellular
<br />
<br />.i,
<br />
<br />Rating
<br />
<br />Construction
<br />
<br />of
<br />
<br />Details
<br />
<br />T:rpe
<br />
<br />4 hI'S. t
<br />
<br />in.
<br />
<br />in. units, minimum face shell thickness 1~ in., mini-
<br />mum end shell thiclmess 1 5/16 in. and minimum
<br />interior web thiclmess 3 1/16 in., unplastered. Concrete
<br />studs built into wall on 2 ft. centers by filling every
<br />third cell along the length of the wall. Each stud
<br />reinforced with one ~ in. round bar. (74) ...
<br />
<br />side
<br />
<br />60)
<br />
<br />Aggregate.
<br />unplastered. (9,
<br />
<br />Expanded Shale
<br />units 60p'o solid
<br />
<br />10
<br />8
<br />
<br />Concrete
<br />Masonry
<br />Units
<br />
<br />2 hI's..
<br />
<br />2 hI'S. *
<br />1~ hI'S..
<br />
<br />1~ hI'S..
<br />
<br />in.
<br />
<br />with ~
<br />
<br />with ~
<br />
<br />units 61p'o solid; unplastered. (9,60)
<br />units 76% solid; plastered on both sides
<br />1:3 gypsum and sand plaster. (9, 60)......
<br />Expanded Slag Aggregate.
<br />10 in. unplastered cavity wall of two 4 in.
<br />apart; units 63p'o solid. (9, 60)
<br />
<br />on one
<br />(60)
<br />
<br />in. units 76% solid; plastered
<br />1:3 gypsum and sand plaster.
<br />in.
<br />
<br />in.
<br />in.
<br />
<br />4
<br />
<br />6
<br />3
<br />
<br />4 hrs.:j:
<br />3 hrs.t
<br />2 hI'S. *
<br />
<br />in.
<br />
<br />in. units 76p'o solid; unplastered. (9, 60)
<br />
<br />in. units 61% solid; unplastered. (9, 60)
<br />
<br />in. units 50% solid; plastered on' one side with ~ in.
<br />1:3 gypsum and sand plaster. (9,60)
<br />
<br />wythes 2
<br />
<br />6
<br />6
<br />6
<br />
<br />,I
<br />
<br />'~~
<br />I
<br />
<br />2 hI'S..
<br />
<br />2 hI'S..
<br />
<br />2 hI'S..
<br />
<br />in.
<br />
<br />in.
<br />
<br />with ~
<br />
<br />with ~
<br />
<br />in. units 76% solid; plastered on one side
<br />1:3 gypsum and sand plaster. (9, 60)......
<br />
<br />in. units 76% solid; plastered on both sides
<br />1:3 gypsum and sand plaster. (9, 60)"....
<br />
<br />in. units 63% solid; plastered on one side
<br />1:3 gypsum sand and plaster. (9, 60)..,..
<br />
<br />in.
<br />
<br />4
<br />
<br />3
<br />
<br />1~ hrs..
<br />1 hr..
<br />
<br />in.
<br />
<br />with ~
<br />
<br />60)
<br />
<br />4
<br />
<br />units 63% solid; unplastered.
<br />Pumice Aggregate.
<br />lOin. units 60% solid; unplastered. (60)
<br />4 in. units 63% solid; unplastered. (9, 60)
<br />
<br />(9,
<br />
<br />4
<br />
<br />t.
<br />
<br />4 hrs.t
<br />hr.
<br />
<br />3 hrs.t
<br />2 hrs.t
<br />
<br />Calcareous
<br />
<br />8 in. unplastered units,
<br />
<br />8 in. unplastered units,
<br />
<br />4 in. units 63 % solid; plastered on both sides
<br />1:3 gypsum and sand plaster. (9, 61)....
<br />
<br />in.
<br />
<br />Gravel Aggregate.
<br />78% solid. (61)
<br />57% solid.
<br />
<br />(61)
<br />
<br />~
<br />
<br />1~ hI'S..
<br />
<br />in.
<br />
<br />in.
<br />
<br />with ~
<br />
<br />hr.t
<br />
<br />load bearing with noncombustible or no members
<br />
<br />Letter superscripts
<br />
<br />1
<br />
<br />2 hI'S.
<br />
<br />is
<br />
<br />2
<br />
<br />the rating
<br />
<br />page 47,
<br />
<br />wythes
<br />
<br />wal
<br />
<br />of two 4
<br />61)
<br />
<br />refer to notes,
<br />
<br />the
<br />
<br />into
<br />
<br />10 in. unplastered cavity wall
<br />apart; units 63% solid. (9,
<br />
<br />frameda
<br />
<br />members
<br />
<br />· Nonbearing. t Rated as
<br />framed into wal1.
<br />:j: With combustible
<br />
<br />4 hI'S.
<br />
<br />Letter superscripts refer to notes, page 47,
<br />23
<br />
<br />,e
<br />
<br />e
<br />
<br />34
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