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Stairs, other than those in single-family and two- family dwellings or serving only one dwelling unit in a multiple dwelling, shall comply with the following construction requirements:
(a) Stairs shall be constructed entirely of noncombustible materials in the following buildings:
(1) Buildings of Types I-A, I-B, I-C and II construction;
(2) Buildings of institutional and assembly units except churches;
(3) Buildings of all occupancies four stories or more in height or having an occupancy content of more than 40 persons above or below the grade floor level.
(b) The under side of stairways of combustible construction shall be protected to provide fire resistance of not less than one hour.
(c) Stairs shall be constructed with solid risers, treads and platforms except that open risers may be used for stairways constructed of noncombustible materials serving as exits from boiler rooms and other mechanical equipment areas.
(d) The finished surface of treads and landings shall be of materials which will not cause danger of slipping.
(e) No closet or storage space shall be located beneath stairs.
(Prior code § 67-10.4)