1011.12 Stairway to roof and roof access.
BC § 1011.12
In buildings four or more stories or more than 40 feet (12 192 mm) in height above grade, one stairway shall extend to the roof surface through a stairway bulkhead complying with Section 1510.2, unless the roof has a slope steeper than 20 degrees (0.35 rad). Access to setback roof areas may be through a door or window opening to the roof. Stairways terminating at the level of a setback shall provide access to the setback roof areas, except where the setback is less than 4 feet (1220 mm) in width and 10 feet (3048 mm) in length, measured from the inside of the parapet wall.
