15-8-500 Stairways and exitways.

   In stairways required by Section 15-8-490 to be of noncombustible construction, finish flooring of combustible materials shall not exceed one-sixth inch in thickness.

(Prior code §  62-10.5)

15-8-510 Roof structures.

   Except aerial supports, not exceeding 12 feet in height, all roof structures hereafter placed above the roof of any building within the fire limits, or above the roof of any building exceeding 55 feet in height, shall be constructed of noncombustible materials and shall be supported by construction of noncombustible materials, except the walking surface of a rooftop deck may be of combustible materials meeting the requirements for Class A roof coverings if constructed above a roof of noncombustible material and supported by construction of noncombustible material. Such structures shall also comply with the special requirements of Sections 15-8-520 to 15-8-560, inclusive.

(Prior code § 62-11; Amend Coun. J. 3-29-17, p. 45477, § 5)

15-8-520 Skylights and monitors.

   (a)   Sashes and frames of skylights which are inclined more than 30 degrees from the vertical shall be constructed of noncombustible materials, except, as provided by the building commissioner, in buildings where acid fumes deleterious to metal are incidental to the use of the building.

   (b)   All skylights, except in greenhouses, shall be glazed with wired glass having no single pane exceeding 720 square inches in area or 48 inches in any dimension.

   (c)   Walls of skylights and monitors shall be of construction not less fire-resistant than required for the roof on which they are erected; provided, however, the walls which extend more than ten feet above the roof shall be constructed of noncombustible materials.

(Prior code § 62-11.1; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 42; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)

15-8-530 Penthouses.

   (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)

15-8-540 Mansard and sloping roofs.

   Mansard or sloping roofs, the plant of which forms an angle of more than 60 degrees but not more than 75 degrees with the horizontal, shall be classified as roofs and shall comply with all applicable requirements of this Code, except that such roofs, erected on buildings more than 40 feet in height, of Types III-A, III-B or III- C construction shall be constructed of noncombustible materials or fire-retardant-treated wood, providing fire resistance of not less than one hour. Such use shall comply with Section 13-128-100(a) if applicable.

(Prior code §  62-11.3)

15-8-550 Towers.

   (a)   Towers are defined as structures, including spires, domes or cupolas, extending above the roof of a building and used only for architectural embellishment or for housing bells, clocks and similar installations.

   (b)   Every tower shall be of a type of construction not less fire-resistant than required for the building on which it is erected and when exceeding the height limitations for the building as established in Section 13-48-030.

      (1)   Towers exceeding 60 feet in height above grade shall be constructed of and supported by Types I- A, I-B or I-C construction.

      (2)   Towers exceeding 25 feet in height above the roof on which they are erected or exceeding 200 square feet in area at any horizontal section shall be constructed of and supported by noncombustible materials and shall be separated from the building below by a floor or roof deck providing fire resistance of not less than one hour.

(Prior code §  62-11.4)

15-8-560 Miscellaneous roof structures.

   Miscellaneous roof structures, including dormers, bulkheads, scuttles and similar structures shall be constructed of material not less fire-resistant than required for the roof construction on which they are erected.

(Prior code §  62-11.5)

15-8-570 Firestopping.

   Firestopping, complying with the provisions of Sections 15-8-580 to 15-8-640, inclusive, shall be designed and constructed to close all concealed draft openings and to form effective fire barriers between stories of every building and in all concealed spaces therein against the spread of fire.

(Prior code §  62-12; Amend Coun. J. 6-14-95, p. 2841)