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<br />Steel
<br />Beams,
<br />Girders
<br />and
<br />Trusses
<br />individually
<br />protected
<br />
<br />Letter superscripts refer
<br />8
<br />
<br />Clay tile or concrete block; plastered
<br />with ~ in. portland cement or
<br />gypsum plaster. ..",.""...".."..":."."..,,
<br />Clay tile or concrete block; plastered
<br />with ~ in. portland cement or
<br />gypsum plaster; all spaces between
<br />member and tile or block filled
<br />
<br />solid. ,.,....,'.,......,."",..,...........................
<br />Clay tile or concrete block; unplas-
<br />
<br />tered. ..."....,....,.....,....,........"..............,...
<br />C:hlv tilp. nr r.nnr.rp.tp. hlndc: nnnlll.!l-
<br />" tered;- all spaces between' member
<br />and tile or block filled solid.
<br />
<br />to notes,
<br />
<br />page 47.
<br />
<br />2
<br />
<br />2
<br />
<br />2
<br />
<br />2
<br />
<br />2
<br />
<br />2
<br />
<br />2
<br />
<br />2
<br />
<br />.
<br />
<br />''1
<br />
<br />.
<br />
<br />49
<br />
<br />(11) "Tests of the Fire Resistance and Thermal Properties of Solid Con-
<br />crete Slabs and Their Significance," by Carl A Menzel. American Society for
<br />Testing Materials, Proceedings, Volume 43, 1943.
<br />
<br />(12) Ohio State University Research Foundation Report No. 37, June, 1945
<br />(unpublished). Abstract of report published in reference (42).
<br />
<br />(13) Ohio State University Research Foundation Report No. 39, Aug., 1945
<br />(unpublished). Abstract of report published in reference (42).
<br />
<br />(14) Ohio State University Research Foundation Report No.1, May 5, 1939
<br />(unpublished). Abstract of report published in reference (42).
<br />
<br />(15) Columbia University, Dept. of C. E. Testing Laboratories Report No.
<br />F. W. 2, Aug. 29, 1919 (unpublished).
<br />
<br />(16) Ohio State University Research Foundation Report No. 43, !<'eb. 6,
<br />1946 (unpublished). Abstract of report published in reference (42).
<br />
<br />(17) Columbia University, Dept. of C. E. Testing Laboratories Report No,
<br />F. W. 59. Aug., 1930 (unpublished).
<br />
<br />Type
<br />
<br />Details
<br />
<br />of
<br />
<br />Protection
<br />
<br />Minimum Thickness.
<br />Inches, for Rating of
<br />
<br />4 hrs. 3 bra. 2 bra. hr.
<br />
<br />~
<br />
<br />(10) Underwriters' Laboratories, Ine. Report on Interior Building Con-
<br />struction Consisting of Metal Lath and Gypsum Plaster on Wood Supports, Aug.,
<br />1922.
<br />
<br />Reinforced
<br />Concrete
<br />Beams,
<br />Girders and
<br />Trusses
<br />
<br />in.l
<br />
<br />concrete
<br />
<br />1
<br />
<br />hr.
<br />
<br />(7) "Fire Tests of Wood- and
<br />of Standards Report BMS 71, 1941.
<br />
<br />(8) Columbia University, Dept.
<br />F. W." 46, July, 1929 (unpublished).
<br />
<br />(9) "Fire Resistance Classifications of
<br />Bureau of Standards, Report BMS 92, 1942.
<br />
<br />Building Constructions,"
<br />
<br />National
<br />
<br />of
<br />
<br />C. E. Testing Laboratories
<br />
<br />Report
<br />
<br />No.
<br />
<br />Estimated
<br />
<br />Any ceiling protection described under Floor and Ceiling
<br />Constructions, Steel, if the beams, girders or trusses
<br />do not extend below the level of the ceiling surface
<br />more than 6 in. (see note j)
<br />
<br />Ratings
<br />
<br />Same as
<br />Floor
<br />Rating
<br />
<br />.
<br />
<br />.~
<br />
<br />Metal-Framed
<br />
<br />Partitions,
<br />
<br />National
<br />
<br />Bureau
<br />
<br />Ceiling of 1 in. (measured from face of lath) sprayed
<br />fiber on metal lath, with not less than 2 in. air space
<br />between lath and structural members. Steel members
<br />to project not more than 8 in. below ceiling surface.
<br />Other details as specified in U.L. Iistingc, under
<br />Floor or Roof, and Ceiling Constructions-Design
<br />No. 2-3 HR (Beam 2 HR)
<br />
<br />2 hrs.
<br />
<br />Ceiling of 1 in. gypsum-vermiculite plaster (measured
<br />from face of lath) on metal lath. Plaster mix: 4:1 by
<br />weight or approx. 100 Ibs. fibered gypsum to 2~ cu. ft.
<br />vermiculite. (32)
<br />
<br />3
<br />
<br />hrs.
<br />
<br />Steel
<br />Beams,
<br />Girders
<br />and
<br />Trusses
<br />Protected
<br />by a
<br />Ceiling.J
<br />
<br />Ceiling of 1i in. (measured from face of lath) gypsum-
<br />vermiculite plaster, on metal lath suspended beneath
<br />structural members and ducts. Lath supported not
<br />less than 3~ in. below structural members. Duct
<br />openings not to exceed 85 sq. in. in each 100 sq. ft.
<br />ceiling area; not more than one electrical outlet in
<br />each 90 sq ft. ceiling area. Plaster mix: scratch coat
<br />2 to 2~ cu. ft. and brown coat 3 to 334 cu. ft.
<br />vermiculite to 100 Ibs. fibered gypsum. Damper pro-
<br />tection, duct locations and other details as specified
<br />in U.L. listinge, under Floor or Roof, and Ceiling
<br />Constructions-Design No. 1-3 HR
<br />
<br />3
<br />
<br />hrs.
<br />
<br />REFERENCES
<br />
<br />ee Portions
<br />junction boxes
<br />
<br />cc Wallboard or coreboard with a specially formulated core which provides
<br />greater fire resistance than regular wallboard or coreboard of the same thickness.
<br />
<br />electrical raceways and
<br />
<br />(1) "Fire Resistance of Brick Walls," National Bureau of Standards Tech-
<br />nical News Bulletin No. 124, Aug., 1927.
<br />
<br />(2) "Fire Resistance of Sand-Lime and Concrete Brick Walls," National
<br />Bureau of Standards Technical News Bulletin No. 132, April, 1928.
<br />
<br />(3) Underwriters' Laboratories, Ine. Card Data Service card "C85 Clay
<br />Brick, Common, Walls and Partitions-Fire Retardant Classification" (Serial No.
<br />UL128, Jan., 1939).
<br />
<br />(4) "Fire Resistance of Hollow Load-Bearing Wall Tile," National Bureau
<br />of Standards Research Paper No. 37, 1928.
<br />
<br />(5) "A Study of the Fire Resistance of Building Materials" Bulletin No.
<br />104 of the Engineering Experiment Station of Ohio State University (Jan., 1940).
<br />
<br />(6) Ohio State University Engineering Experiment Station Report No.
<br />T-26, Bulletin of the Board of Standards and Appeals of the City of New York.
<br />July 19, 1941.
<br />
<br />of this concrete
<br />may consist of a 2
<br />
<br />dd Portions of this concrete slab not containing
<br />junction boxes may consist of a 3 in. concrete slab.
<br />
<br />slab not containing
<br />in. concrete slab.
<br />
<br />electrical
<br />
<br />raceways
<br />
<br />and
<br />
<br />bb This construction is not acceptable for use where a 2-haur construction is
<br />required to be of noncombustible materials, as is specified for all two-hour parti-
<br />tions in the National Building Code.
<br />
<br />'{
<br />
<br />Type
<br />
<br />BEAM, GIRDER AND TRU.SS PROTECTIONS-Continued
<br />Fire Resistance Ratings Based on Standard Fire Tests
<br />
<br />Details
<br />
<br />of
<br />
<br />Construction
<br />
<br />Rating
<br />
<br />'.
<br />
<br />.
<br />
<br />z Ratings given are for fire exposure from the plastered
<br />higher ratings were obtained with brick face exposed to fire.
<br />
<br />BB Wire ties of No.8 SWG (0.16 in. diam.) steel wire
<br />steel colul1Ul on a pitch of 8 in.
<br />
<br />wound
<br />
<br />spirally around
<br />
<br />FIRE
<br />
<br />,_
<br />
<br />RESISTANCE
<br />
<br />RATINGS
<br />
<br />e
<br />
<br />e
<br />
<br />FIRE
<br />
<br />RESISTANCE
<br />
<br />e
<br />
<br />RATINGS
<br />
<br />side.
<br />
<br />Somewhat
<br />
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