Section 1210. Penthouses and Roof Structures. —
Height — No penthouse or other projection above the roof in structures of other than Type V construction shall exceed 8.40 meters above the roof when used as an enclosure for tanks or for elevators which run to the roof and in all other cases shall not extend more than 3.60 meters in height with the roof.
Area — The aggregate area of all penthouses and other roof structures shall not exceed one third of the area of the supporting roof.
Prohibited Uses — No penthouse, bulkhead, or any other similar projection above the roof shall be used for purposes other than shelter of mechanical equipment or shelter of vertical shaft openings in the roof. A penthouse or bulkhead used for purposes other than that allowed by this Section shall conform to the requirements of this Code for an additional storey.
Construction — Roof structures shall be constructed with walls, floors, and roof as required for the main portion of the building except in the following cases:
On Types III and IV constructions, the exterior walls and roofs of penthouses which are 1.50 meters or more from an adjacent property line may be of one-hour fire-resistive incombustible construction.
Walls not less than 1.50 meters from an exterior wall of a type iv construction may be of one-hour fire-resistive incombustible construction.
The above restriction shall not prohibit the placing of wood flagpoles or similar structures on the roof of any building.
Towers and Spires — Towers and spires when enclosed shall have exterior walls as required for the building to which they attached. Towers not enclosed and which extend more than 20.00 meters above the grade shall have their framework constructed of iron, steel, or reinforced concrete. No tower or spire shall occupy more than one-fourth of the street frontage of any building to which it is attached and in no case shall the base area exceed 150 square meters unless it conforms entirely to the type of construction requirements of the building to which it is attached and is limited in height as main part of the building. If the area of the tower and spire exceeds 10.00 square meters any horizontal cross section, its supporting frames shall extend directly to the ground. The roof covering of the spires shall be as required for the main room of the rest of the structure. Skeleton towers used as radio masts, neon signs, or advertisement frames and placed on the roof of any building shall be constructed entirely of incombustible materials when more than 7.50 meters in height, and shall be directly supported on an incombustible framework to the ground. No such skeleton towers shall be supported on roofs of combustible framings. They shall be designed to withstand a wind load from any direction in addition to any other loads.