O-1952-429 - Laserfiche WebLink

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(b). Doorways opening onto a street or to a court or open space communicating with a street, and serving as a required exit way for more than 40 persons shall have the doors, including the doors of vestibules, so hung as to swing open in the direction of exit travel; but this requirement shall not be construed to prohibit the use of sliding doors in stables, garages, or shipping and receiving rooms of business buildings and storage buildings. . (c). All exit doors in rooms occupied by 40 or more persons and al1 exit doors in exit ways from places of assembly shal1 be hung to swing open in tqe direction of exit travel. (d). No exit door shall open immediately on a flight of stairs, a landing the length and width of which are not less than the 16 but . . 21 Unprotected metal construction, as applied to buildings, means that in which the structural supports are unprotected metal and in which floors and roofs are of noncombustible construction, and the exterior walls are of noncombustible construction having a fire re- sistance rating of less than 2 hours. 9. Firestopping. (a). Exterior walls of wood frame construction shall be prop- erly firestopped at each floor level, at the top story ceiling level, at the roof level in the case of flat roofs, and at the foot of roof rafters in the case of sloping roofs. (b). Joists shall be firestopped at the ends and over supports for the full depth of the joists. (c). Interior stud partitions shall be firestopped at the floor and ceiling of each story by a 2-inch, nominal dimension, wood plate, the width of the stud, or the equivalent. (d). When sliding doors are pocketed in partitions, such pockets shall be completely firestopped at the top, bottom and ends. (e). Firestopping shall be of noncombustible material or of wood not less than 2 inches in thickness, nominal dimension. No firestopping shall be covered or concealed until inspected by the building official. 10. Draft stops in attic spaces. Draft stops shall in attic spaces as required by section 17-10. J SECTION TION. 20. UNPROTECTED METAL CONSTRUC- be provided 13. Hanging of doors. (a). The doors of required doorways shall be so hung and ar- ranged that when fully opened they will not in any way diminish or obstruct the required width of hallway, stair, or other means of exit. 11. Exit hallways. The clear width of every hallway or pas- sage leading to a required exit shall be not less than at the rate of 12 inches for every 100 persons to be accommodated by the hallway but not less than 44 inches; provided that in multifamily houses or in case less than 40 persons are to be accommodated, the minimum clear width may be 36 i,nches. 12. Width of doorways. The aggregate clear width of door- ways serving as required exits shall be not less than at the rate of 22 inches for every 100 persons to be accommodated. No exit doorway serving as an exit for more than 40 persons shall have a clear width of less than 34 inches (nominal 36-inch door.) . . to. Handrails. (a). Except for steps in aisles, stairs shall have secured balustrades or guards on both sides. (b). Such stairs when less than 44 inches in width shall handrails on at least one side. (c). Such stairs when required to be 44 inches or more width shall have handrails on both sides. (d). When the required width of a flight of stairs exceeds 88 inches, an intermediate handrail, continuous between landings, se- curely supported and terminating at the upper end in newels or standards at least 6 feet high, with no projections, shall be pro- vided. 8. Wooden columns shall tion 17-6. conform to the requirements of sec- 111 7. Load-bearing partitions shall of section 17-5. 6. Beams, girders and joists shall conform to the requirements of section 17-3, paragraphs (a) to (d) inclusive. Where ledger or ribbon boards are used to support joists, such boards shall be not less than 1 x 4 inch, nominal dimensions, shall be cut into the studs and securely nailed with not less than 2 tenpenny nails to each stud, and the joists shall be spiked to the studs. conform to the requirements 9. Landings. (a). No flight of stairs shall have a vertical rise of more than 12 feet. between floors or landings; except "that in stairways serving as exits in public buildings such vertical rise shall not exceed 8 feet. (b). The length and width of landings shall be not less than the width of stairways in which they occur. walls or have wel 5. Anchorage. (a). In all buildings 20 feet or more in width where joists run at right angles to the rafters, the rafters shall be tied to the ceiling joists with wood or metal ties nailed to the foot of alternate rafters and extending across 4 joists well nailed to each joist. (b). All joists shall be well lapped and nailed across the build- ing to form ties between outside walls. . . risers may, in the discretion. the building official, be adjusted to suit the age of the pupils for which the school is intended. Treads and risers shall be of uniform width and height in anyone story. (b). The use of winders is prohibited in required stairways. e e (c). Corrosion-resistant flasl, to prevent moisture from penetrating behind the stucco, shall be provided over wall openings and over projecting COurses. 4. Sills. Sills shall be anchored to the foundation walls at intervals not exceeding 6 feet by anchors equivalent to bolts not less than 0 inch in diameter with proper washers, embedded at least 6 inches in the foundation.