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Title: Section 1511  •  Size: 4195

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SECTION 1511 - PENTHOUSES AND ROOF STRUCTURES

1511.1 Height. In buildings other than Type I construction, penthouses or other roof structures shall not exceed 28 feet (8534 mm) in height above the roof surface.

1511.2 Area. The aggregate area of all penthouses and other roof structures shall not exceed 331/3 percent of the area of the supporting roof.

1511.3 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. Penthouses or bulkheads used for purposes other than permitted by this section shall conform to the requirements of this code for an additional story.

1511.4 Construction. Roof structures shall be constructed with walls, floors and roof as required for the main portion of the building.

EXCEPTIONS: 1. On Types I and II-F.R. buildings, the exterior walls and roofs of penthouses which are 5 feet (1524 mm) or more from an adjacent property line may be of one-hour fire-resistive noncombustible construction.

2. On Types III and IV buildings, walls not less than 5 feet (1524 mm) from an adjacent property line may be of one-hour fire-resistive noncombustible construction.

3. Enclosures housing only mechanical equipment and located at least 20 feet (6096 mm) from adjacent property lines may be of unprotected noncombustible construction.

4. On one-story buildings, unroofed mechanical equipment screens, fences or similar enclosures may be of combustible construction when located at least 20 feet (6096 mm) from adjacent property lines and when not exceeding 4 feet (1219 mm) in height above the roof surface.

The restrictions of this section shall not prohibit the placing of wood flagpoles or similar structures on the roof of any building.

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