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(a) A penthouse is hereby defined as an enclosed space located on a roof for the housing of a stairway or equipment used in the operation of a building such as tanks, fans or elevator machinery, but containing no habitable or storage space.
(b) Penthouses occupying an aggregate area exceeding one-third of the roof area shall be considered a story of the building and shall be subject to all applicable requirements of this Code.
(c) Walls of penthouses located less than five feet from the exterior walls of the building shall provide fire resistance as required for the exterior wall. Walls of penthouses located five feet or more from the exterior wall of a building, except in buildings of Types II, IV-A and IV-B construction, shall provide fire resistance of not less than one hour.
(d) Roofs of penthouses shall provide fire resistance as required for the roof construction on which the penthouse is located.
(Prior code § 62-11.2)