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No wall or part of a wall in any existing building nor
<br />in any building hereafter erected, shall be removed to produce
<br />a larger floor area than herein specified. Openings in fire
<br />walls of buildings shall in no case exceed three in n~zber,
<br />nor be over g' 0M in width, nor more than 10' O" in height,
<br />and there must be a curtain wall 3' O" high between the top
<br />of such door openings and the ceiling line above. These
<br />openings must be provided with approved automatic self-closing
<br />fireproof doors on both sides of the wall.
<br /> Fl~orareas in any building must not exceed the
<br />following limitations: In all stores, warehouses, or factories
<br />of Class A or B construction, and in all buildings of Class C
<br />construction, no single floor area between fire wall shall
<br />exceed the following limitations:
<br /> Fronting on one street only.
<br />
<br />Fronting on one street only
<br />Fronting on corner or extend-
<br />ing from street to street 12,000 lO,O00 6750
<br />Fronting on three streets 15,000 11,250 7500
<br />With permanent open space
<br />at least 30'0" wide on all
<br />sides 20,000 15,000 9000
<br />
<br />Class
<br /> sq. ft. sq.ft, sq. ft.
<br />...10,000 ?500 5000
<br />
<br /> In Class A and B buildings when the occupancy is other
<br />than stores, warehouses or factories, the above specified
<br />areas may be increased one-third.
<br /> In case buildings covered by the above provisions
<br />equipped with an approved system of automatic sprinklers, the
<br />areas given above mmy be increased 5© per cent. The automatic
<br />sprinkler system, including the water supply, shall be kept
<br />in perfect working order by the owner, lessee or occupant of
<br />the premises. When more than two buildings communicate, although
<br />protected by double standard fireproof doors, they shall be pro-
<br />vided with an approved system of automatic sp~nklers where
<br />occupied as stores, warehouses or factories.
<br /> Roofs of Class A buildings must be constructed through-
<br />out with fireproof material, but may have a top coating of
<br />msphAtum or composition roofing. 0~ all Class B or C buildings
<br />metal or composition roofing mmy be u~ed, and rafters must not
<br />be less than 24 inch from center to center, covered with one
<br />inch boarding.
<br /> Every building within the fire limits shall be provided
<br />with iron or steel water conductors, with sufficient capacity
<br />to convey all surface drainage from the roof to the street or
<br />alley. Such conductor must be extended to the curb line,
<br />~nd discharge into the gutter, and must be below the surface of
<br />the sidewalk, and where buried in the ground must be of cast
<br />iron. Every conductor pipe must be constructed with an overflow
<br />4 inches above the level of the roof at its lowest point.
<br /> The space between the ceiling of the top story and the
<br />roof in any Class B,C, or D building, shall be divided by light
<br />partitions of one inch boards into eection~ having an area not
<br />exceeding 2500 s~. ft. Some means of entering each One of these
<br />section~ must be provided, so that easy access may be had from
<br />the roof.
<br /> There must be a hatchway provided with a means of
<br />fastening, so that the hatch may be easily open from the inside
<br />~t any time.
<br /> All skylights in Class A, B or C buildings other than
<br />over elevator or stair shafts, sh~ll be of wire glass not less
<br />than 1/4M thick, set in metallic frames or prismatic glass s~t
<br />in concrete. Skylights over elevators and stair shafts must
<br />be made of glass not more then l/g" thick and covered above and
<br />below with strong wire netting, and wire glass must not be used.
<br />Over elevator shafts there must be a skylight of at least 3/4
<br />the area of the shaft, and there shall ~c a skylight over every
<br />stair enclosure o£ at least 3/g the area of the shaft, the same
<br />~s required for elevator shafts.
<br /> Elevator shafts in Class "A" buildings must be com-
<br />pletely enc2osed and constructed of fire proof materials through-
<br />out, and sha~l extend from the basement to at least 3' O" above
<br />the roof. A~l door openings in such elevator enclosure shall be
<br />provided with standard fire doors and the si~l sha2~ be of in-
<br />combustible material. Wire glass may be used to form part of such
<br />enclosure, and must be not less than 1/4 inch thick in fixed
<br />metal frames and sash. When the lower end of the shaft is open
<br />to accommodate machinery, such machinery must be enclosed in
<br />manner similar to the shaft, so that the shaft and machinery
<br />covering form a complete fireproof enclosure. In Class B and
<br />buildings elevators must be enclosed in the shaft similex to
<br />Class MA" except in this case stud partitions may be allowed to
<br />be substituted for the fireproof construction if covered with
<br />metal lath and plaster on both sides 3/4 "thick,and a21 doors
<br />in such shafts may be constructed of metal or metal covered with
<br />tin or wire glass and the roo~ containing the elevator machinery
<br />shall be of the same construction as required for the elevator
<br />shafts, ~he elevator cage,must be made of fireproof material
<br />excepting the floor which may be of hard wood.
<br />
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