504.4.8 Rooftop access underneath cantilevered or overhead buildings.
FC § 504.4.8
Where a building is constructed directly above another building, including a building cantilevered over another building, a vertical clearance from the rooftop of the building below shall be provided for firefighting operations in accordance with the following requirements. Design and installation documents documenting compliance with this section, including the fire analysis filed with the Department of Buildings, shall be submitted for Fire Department review and approval. Such vertical clearance: 1. shall be at least 12 feet (3658 mm); and 2. shall be at least 9 feet (2743 mm) above the highest building feature on the rooftop when the building feature is 25 feet (7620 mm) or less from the closest exterior surface of the building constructed above; but 3. shall not apply to rooftop areas above which a noncombustible screen wall or other similar structure has been constructed for purposes of zoning compliance, provided that such structure extends below the cantilever from the side wall of the new building facing a street for a width not to exceed 8 feet (2438 mm) and a depth not to exceed 12 feet (3658 mm).
