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<br />shall be deemed a story when used for purposes other than storage
<br />or heating.
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<br />Height, as applied to a wall, means the vertical distance to the
<br />top measured from the foundation wall, or from a girder or other
<br />immediate support of such wall. '
<br />
<br />Hollow masonry unit means a masonry unit whose net cross-
<br />sectional area in any plane parallel to the bearing surface is less
<br />than 75 per cent of its gross cross-sectional area measured in the
<br />same plane.
<br />
<br />.
<br />
<br />.
<br />
<br />Lot means a portion or parcel of land considered as a unit,
<br />devoted to a certain use or occupied by a building or a group
<br />of buildings that are united by a common interest or use, and the
<br />customary accessories and open spaces belonging to the same.
<br />
<br />lot from another, or from
<br />
<br />a
<br />
<br />Masonry means brick, stone, plain concrete, hollow block, solid
<br />block or other similar building units or materials, or combinations
<br />of them, bonded together with mortar. Reinforced concrete is not
<br />classed as masonry.
<br />
<br />Multifamily house means a building occupied as the home or
<br />residence of individuals, families or households living independently
<br />of each other, of which three or more are doing cooking within
<br />their apartments; including tenement house, apartment house, flat.
<br />
<br />unit which has
<br />
<br />adopted
<br />
<br />Place of assembly means a room or space in which provision
<br />is made for the seating of one hundred or more persons for religious,
<br />recreational, educational, political, social or amusement purposes or
<br />for the consumption of food or drink. Such room or space shall
<br />include any occupied connecting room or space in the same story,
<br />or in a story or stories above or below, where entrance is common
<br />to the rooms or spaces.
<br />
<br />fabricated
<br />
<br />Prefabricated means composed of sections or panels
<br />prior to erection on the building foundation
<br />
<br />more
<br />
<br />Solid masonry means masonry consisting of solid masonry units
<br />laid contiguously with the joints between the units filled with mor-
<br />tar, or consisting of plain concrete.
<br />
<br />a masonry unit whose net cross-
<br />parallel to the bearing surface is 75
<br />cross-sectional area measured in the
<br />
<br />Solid masonry unit means
<br />sectional area in every plane
<br />per cent or more of its gross
<br />same plane
<br />
<br />Sprinkle red means equipped with an approved automatic sprink-
<br />ler system properly maintained.
<br />
<br />Street means any public thoroughfare, street, avenue, boulevard,
<br />park, lane" terrace, concourse or space 20 feet or more in width which
<br />has been dedicated or deeded to the public for public use.
<br />
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<br />Lot line nleans a line dividing one
<br />street or other public space.
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<br />story from communicating to any other story; provided t.hat in
<br />buildings of heavy timber construction there shall be no floor open-
<br />ing that is not protected as prescribed in this section or in some
<br />other approved manner.
<br />(b). The provisions of this section shall apply to all shafts
<br />used for ventilation, light, elevator, pipes, or other purpose, except
<br />stairways, air ducts, incinerator chutes, flues, shafts in buildings of
<br />wood frame construction, shafts in dwellings, and ramps in garages
<br />exempted by section 37-6.
<br />
<br />2. Shaft enclosures. The enclosing walls of shafts in residence
<br />buildings of ordinary construction or noncombustible construction
<br />or unprotected metal construction shall have a fire resistance rating
<br />of not less than 1 hour. The enclosing walls of shafts in other
<br />buildings shall be of noncombustible construction having a fire re-
<br />sistance rating of not less than 2 hours.
<br />
<br />3. Openings. Shaft enclosures shall" have no openings other
<br />than those necessary for the purpose of the shaft; provided that in
<br />elevator shafts there shall be at least one door in every 30 feet of
<br />the height of such shaft. Such openings shall be protecteQ with
<br />approved fire doors, approved fire shutters or approved fire windows.
<br />
<br />Municipality means the governmental
<br />this code under due legislative authority
<br />
<br />.
<br />
<br />two or
<br />
<br />Shaft means a vertical opening or passage through
<br />floors of a building or through floors and roof.
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<br />4. Enclosure at top.
<br />(a). Shaft enclosures extending through the roof which are to
<br />be enclosed at the top, shall be provided with a skylight of at least
<br />10 per cent of the area of the shaft in the top story and glazed with
<br />plain glass ~-inch in thickness; provided that the skylight may be
<br />replaced by a window of plain glass of equivalent area in the side
<br />of the shaft if the sill of such window is not less than 2 feet above
<br />the roof and the window does not face a lot line within 10 feet, or
<br />may be replaced by approved means of ventilation.
<br />(b). A shaft that does not extend through the roof shall have
<br />the top enclosed with a form of construction having a fire resistance
<br />rating equal to that of the walls of the shaft.
<br />
<br />5. Enclosure at bottom. A shaft that does not extend to the
<br />bottom of the building shall be enclosed at its lowest point with a
<br />floor construction of the same type as that required for the lowest
<br />floor to or through which it passes, but such shaft floor construction
<br />shall have a fire resistance rating of not less than one hour.
<br />
<br />6. Elevator machinery compartment. Compartments contain-
<br />ing machinery for operating elevators shall be separated from the
<br />elevator shafts by noncombustible construction having a fire re-
<br />sistance rating of not less than 2 hours, with door openings equipped
<br />with approved fire doors
<br />
<br />elevators
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<br />more than 3
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<br />Not
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<br />7. N umber of elevators in shaft.
<br />shall be placed hereafter in one shaft.
<br />
<br />ROOFING.
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<br />31
<br />
<br />SECTION
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<br />.
<br />
<br />(a). Every roof hereafter placed on a building shall be cov-
<br />ered with an approved roofing of brick, concrete, tile, slate, metal,
<br />asbestos, prepared asphalt asbestos-felt shingles, or of built-up
<br />roofing finished with asphalt, slag or gravel, or other approved
<br />material.
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