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<br />10
<br />
<br />.
<br />
<br />e
<br />
<br />47
<br />
<br />"Group 1. Blast-furnace slag, limestone, calcareous gravel, trap rock,
<br />httrnt c1av or shale, cinders containinll not more than 25% of combustible
<br />;nilterial and not more than 5% of volatile material, and other materials
<br />meeting the requirements of these specifications and containing not more than
<br />30% quartz, chert, flint, and similar materials.
<br />
<br />Letter superscripts refer
<br />
<br />or larger.....,..........."....."
<br />
<br />to notes,
<br />
<br />page 47.
<br />
<br />2
<br />1~
<br />1
<br />
<br />1
<br />1
<br />
<br />1
<br />1
<br />1
<br />
<br />J
<br />1
<br />1
<br />
<br />k Group 1 and group 2 aggregates are defined
<br />tions for Concrete and Reinforced Concrete" of the
<br />port" as follows:
<br />
<br />SxS
<br />12 x
<br />
<br />in. or
<br />12 in.
<br />
<br />in the "Standard Specifica-
<br />1940 "Joint Committee Re-
<br />
<br />Steel
<br />Columns
<br />6 x 6 in. or
<br />largerm
<br />
<br />Brick with brick fill.
<br />
<br />Concrete, coarse aggregate calcare-
<br />ousD or limestone; fill of same
<br />material. (9, 26)
<br />6 x 6 in. or larger......,.......................
<br />
<br />arger.,.................""......,
<br />
<br />( clay)
<br />
<br />(26)
<br />
<br />3~
<br />
<br />1~
<br />
<br />3~
<br />
<br />3~
<br />
<br />2~
<br />
<br />
<br />Type
<br />
<br />Detail.
<br />
<br />1~ in. concrete, coarse aggregate granite, sandstone,
<br />or siliceous gravels; 16 in. or larger round or square
<br />columns.m (27)
<br />
<br />of
<br />
<br />Protection
<br />
<br />Minimum Thickness1
<br />Inches, for Rating of
<br />
<br />4 hra. 3 hra. 2 hrs. hr.
<br />
<br />3 hrs.
<br />
<br />It
<br />
<br />s
<br />
<br />J Ratings given are applicable where there is no combustible material or con-
<br />struction in the enclosed ceiling space. Ceiling to be at such a level that the
<br />beams, girders or trusses to be considered as protected by the ceiling, will not
<br />extend below the level of the ceiling more than 6 in. (as illustrated below), unless
<br />otherwise specified. This depth at any point, to be considered as the average
<br />depth on the two sides. Ratings are for protection only from fire beneath the
<br />ceiling.
<br />
<br />1 ~ in. concrete, coarse aggregate granite, sandstone
<br />or siliceous gravels; light 2 in. mesh expanded metal
<br />centrally located in the protective covering, 12 in. or
<br />larger round or square columns.m (27) .....,......,"...,....,
<br />
<br />3 hrs.
<br />
<br />1~ in. concrete, coarse aggregate granite, sandstone
<br />or siliceous gravels; light 2 in. mesh expanded metal
<br />centrally located in the protective covering. 14 in. or
<br />larger rounel. or square columns.m (27) ..,........,.,.,..'"",
<br />
<br />4 hrs.
<br />
<br />.
<br />
<br />I
<br />
<br />1 ~ in. concrete, ~ in. coarse aggregate granite, sand-
<br />stone or siliceous gravels; covered with 1 in. 1 :2~
<br />(by volume) portland cement and sand or gypsum
<br />and sand plaster, with admixture of not over ~ part
<br />lime; surface of column hacked or column cast
<br />in metal lath form, 16 in. or larger round or square
<br />columns.m (27)
<br />
<br />4
<br />
<br />hrs,
<br />
<br />, Il The ratings of load bearing hollow clay tile depend in certain cases on
<br />the number of cells and units in the wall thickness. These are shown in the table
<br />along with the total thickness (in inches) of the wall, "2U" representing for
<br />example, two units and "4C" representing four cells in the wall thickness.
<br />
<br />h An S-inch tile wall may be used for this rating if hollow spaces are filled
<br />as in Note d.
<br />
<br />I With combustible structural members framed into the wall, plaster is effec-
<br />tive in increasing the fire resistance (over that for a similar wall or partition
<br />unplastered) only when applied on the side opposite that on which the structural
<br />members are framed in, and only with respect to fire exposure from the plastered
<br />side.
<br />
<br />f Where combustible members are framed into the wall, the wall must be
<br />of such thickness or be so constructed that the thickness of solid material between
<br />the end of each member and the opposite face of the wall, or between members
<br />set in from opposite sides, will be not le~ than 93% of the thickness shown in
<br />the table.
<br />
<br />Reinforced
<br />ConcreteY
<br />Columns
<br />
<br />1~ in.l concrete coarse aggregate limestone, calcareousD
<br />gravel, trap rock or blast furnace slag; 12 in. or
<br />larger round or square columns.m (27) ,...".......".........
<br />
<br />2~ in. concrete, coarse aggregate granite, sandstone, or
<br />siliceous gravels; 16 in. or larger round er square
<br />columns.m (27)
<br />
<br />4 hrs.
<br />
<br />
<br />4 hrs.
<br />
<br />,e Equivalent thickness is the average thickness of the solid material in the
<br />wall. It may be found by taking the total volume of a wall unit, subtracting the
<br />volume of core spaces, dividing this by the area of the face of the unit. Where
<br />walls are plastered or faced with brick the thickness of plaster or brick may be
<br />included in determining the equivalent thickness.
<br />
<br />2 in. concrete, coarse aggregate cinderso,
<br />no fill. (9, 26)
<br />
<br />:2:5
<br />
<br />mix
<br />
<br />2~ MS.
<br />
<br />d A 10-in. wall may be used for this rating if hollow spaces near combustible
<br />members are filled with fire resistive material for the full thickness of the wall
<br />and for 4 inches or more above, below and between the combustible members.
<br />
<br />Cast Iron
<br />Columns
<br />7 in. diam.
<br />or largerm
<br />
<br />1 ~ in. portland cement plaster on ~ in. rib metal lath,
<br />with plaster pushed through sufficiently to leave not
<br />over ~ in. air space; Plaster mix (by volume):
<br />1 :1/10 :2~ portland cement, lime and sand; no fill.
<br />(9, 26)
<br />
<br />3 hrs.
<br />
<br />c: See "Fire Protection Equipment List" published annually by Underwriters'
<br />Laboratories, Inc. The use of materials listed by Underwriters' Laboratories, Inc.,
<br />provides reasonable assurance that the materials conform to the standard for such
<br />materials established by the Laboratories in connection with the listing.
<br />
<br />2 in.1 hollow clay
<br />mortar between
<br />
<br />tile with outside wire tiesq; ~ in.
<br />tile and column; no fill. (9, 26).."",.
<br />
<br />3 hrs.
<br />
<br />b Thicknesses given
<br />specified.
<br />
<br />a The ratings for walls with combustible
<br />apply for members framed in not over 4 inches.
<br />
<br />include
<br />
<br />do not
<br />
<br />the
<br />
<br />thickness
<br />
<br />of
<br />
<br />plaster
<br />
<br />where plaster
<br />
<br />is
<br />
<br />Type
<br />
<br />Details
<br />
<br />COLUMN PROTECTIONS
<br />Resistance Ratings Based on Standard Fire
<br />
<br />of Protection
<br />
<br />Tests
<br />
<br />Rating
<br />
<br />.
<br />
<br />.
<br />
<br />members framed
<br />
<br />into the
<br />
<br />wal~
<br />
<br />Fire
<br />
<br />FIRE
<br />
<br />IISTANCE
<br />
<br />RATINGS
<br />
<br />e
<br />
<br />e
<br />
<br />NOTES
<br />
<br />FIRE RESISTANCE
<br />
<br />lINGS
<br />
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