Use and single occupancy of building is not likely to change in future. I construction shall be of noncombustible materials. Underside of canopy is exterior gypsum board. Plywood is fire retardant treated. Plywood is covered with noncombustible copper on top and protected with metal decking and gypsum board below, providing equivalent protection for plywood.
Plywood is necessary for attachment of copper roofing.
No access from the interior is provided to the hatch. Hatch has a fusible link to automatically open with build up of heat at top of stair, which is provided in lieu of interior access to hatch and roof in this central stair. Building designed for addition of 4 future floors. Central stair is designed to encourage use of stairs between floors instead of elevators. Intermediate handrails at stairways for every 88 inches of required width.