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<br />LIGHT AND VENTILATION.
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<br />soil and not less than 12 inches thick nor more than 35 feet in height,
<br />provided the walls are laterally supported at intervals not exceed-
<br />ing 12 times the wall thickness.
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<br />1. Habitable rooms.
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<br />(a)~ Every habitable room shall be provided with natural light
<br />and ventilation by one or more windows, opening directly on a street
<br />or on a court conforming to subsection 5 of this section.
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<br />(b). Such rooms shall be not less than 7 feet wide in any part,
<br />and shall contain not less than 70 square feet of gross floor area.
<br />Such rooms shall have a clear height of not less than 7 feet 6 inches
<br />for at least 60 square feet of floor area.
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<br />2. Other rooms. Every room, other than a habitable room,
<br />used or occupied by persons, except storage rooms with infrequent
<br />occupancy, shall be provided with one or more windows or venti-
<br />lating skylights opening directly on a street or on a court conform-
<br />ing to subsection 5 of this section; or such rooms shall be provided
<br />with an approved means of mechanical ventilation.
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<br />14.
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<br />SECTION
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<br />3. Access to rooms and waterc1osets.
<br />(a). In multifamily houses hereafter erected or altered access
<br />shall be had to living roms, kitchens and bedrooms without pass-
<br />ing through a bedroom.
<br />(b). Access without passing through a bedroom shall also be
<br />provided to at least one water closet, unless every bedroom has
<br />direct connection with a water closet or a bathroom having water
<br />closet accommodation.
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<br />Gypsum partition tile and block shall be laid in gypsum mor-
<br />tar. Non-bearing partitions and fireproofing of structural clay
<br />tile may be laid in gypsum mortar. Fire brick shall be laid in fire
<br />clay mortar.
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<br />3.
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<br />(a). Thickness of Bearing "Walls.
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<br />(1) Except as otherwise provided in paragraphs (2) to (6)
<br />below, the minimum thickness of solid masonry bearing walls other
<br />than fire walls and party walls shall be not less than 12 inches for
<br />the uppermost 35 feet of their height, and shall be increased 4 inches
<br />for each successive 35 feet or fraction thereof measured downward
<br />from the top of the wall.
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<br />(2) Where solid masonry bearing walls are stiffened at dis-
<br />tances not greater than 12 feet apart by cross walls, or by internal
<br />or external offsets or returns at least 2 feet deep, or 12 feet vertically
<br />by reinforced concrete floors or roof, they may be 12 inches thick
<br />for the uppermost 70 feet, measured downward from the top of the
<br />wall, and shall be increased 4 inches in thickness for each successive
<br />iO feet or fraction thereof.
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<br />except stone walls.
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<br />Solid masonry walls,
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<br />4. Windows.
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<br />(a). The aggregate glass area of windows required by this
<br />section shall be not less than 1/10 of the floor area of the room served
<br />by them; provided that in habitable rooms such glass area shall be
<br />not less than 10 square feet, and in bathrooms it shall be not less
<br />than 3 square feet.
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<br />(b). Windows or other openings required for ventilation shall
<br />have an aggregate op~nable area of at least 50 percent of the glass
<br />area required for lighting.
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<br />5. Courts. Every court or yard if light and ventilation are
<br />dependent on such, required by this section to serve habitable rooms,
<br />shall have a width, at any given level, of not less than 1/3 of the
<br />height of such court, but not less than 6 feet.
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<br />MEANS OF EGRESS.
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<br />1. Application of section. Buildings hereafter erected, except
<br />dwellings, shall be provided with exit facilities in accordance with
<br />the requirements of this section. No building shall be altered so
<br />as to reduce the number or capacity of exits to less than required
<br />for new buildings.
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<br />15.
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<br />SECTION
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<br />2. Exit way defined.
<br />(a). "Exit way" means the exit doorway or doorways, or
<br />such doorways together with connecting hallways or stairways,
<br />either interior or exterior, or fire escapes, by means of which per-
<br />sons may proceed safely from a room or space to a street or to an
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<br />(3) In residential buildings not more than 3 stories in height
<br />solid masonry bearing walls may be 8 inches thick when not over
<br />35 feet in height. Walls in one-story dwellings and one-story private
<br />garages may be 6 inches thick when not over 9 feet in height, except
<br />th~1;,.~.h.eight..to~t,h~peak 9J.a ga~le mCl:y""be-M~feet.,.- , ,..-.-
<br />~M4) Solid masonry bearing walls of business buildings and stor-
<br />ge buildings not more than one story high, may be 8 inches thick;
<br />provided the~ are reinforced at inten:als, not exceeding' 20 feet, by
<br />~g)SS walls, pIers or buttresses.' .. .".."..,,0 "
<br />.. , (5) Outside of the fire limits solid masonry bearing walls, 8
<br />inches thick, may be used for buildings not exceeding 30 feet nor 2
<br />stories in height, the walls of which, under this code, could be of
<br />wood frame construction; provided they do not exceed 50 feet in
<br />length between cross walls, piers, or buttresses.
<br />(6) Solid masonry bearing walls above roof level, 12 feet or less
<br />in height, enclosing penthouses or roof structures may be 8 inches
<br />thick and may be considered as neither increasing the height nor
<br />requiring any increase in the thickness of the wall below, provided
<br />the requirements for allowable stresses are met.
<br />.x. (b). Thickness of Non-bearing Exterior walls. The thickness
<br />of non-bearing exterior walls, except fire walls and party walls,
<br />shall be not less than 8 inches for the uppermost 15 feet, and shall
<br />increase 4 inches in thickness for. each successive 35 feet or fraction
<br />thereof measured downward from the top of the wall.
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<br />(c). Lateral Support. Solid masonry walls shal be supported
<br />at right angles to the wall face at intervals not exceeding 20 times
<br />the nominal wall thickness if laid in Type A, B, or C mortar, and not
<br />exceeding 12 times the nominal wall thickness if laid in Type D
<br />mortar. Such lateral support shall conform to subsection 10 of
<br />this section.
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