1011.3 Headroom.
BC § 1011.3
Stairways shall have a headroom clearance of not less than 84 inches (2133.6 mm) measured vertically from a line connecting the edge of the nosings. Such headroom shall be continuous above the stairway to the point where the line intersects the landing below, one tread depth beyond the bottom riser. The minimum clearance shall be maintained the full width of the stairway and landing. Projections into the required width shall not be limited above the minimum headroom height. Exceptions: 1. In Group R-2 and R-3 occupancies stairways shall have a headroom clearance of not less than 80 inches (2032 mm).
2.Spiral stairways complying with Section 1011.10 are permitted a 78-inch (1981.2 mm) headroom clearance.
3.In Group R-3 occupancies; within dwelling units in Group R-2 occupancies; and in Group U occupancies that are accessory to a Group R-3 occupancy or accessory to individual dwelling units in Group R-2 occupancies; where the nosings of treads at the side of a flight extend under the edge of a floor opening through which the stair passes, the floor opening shall be allowed to project horizontally into the required headroom not more than 4 3/4 inches (120.7 mm).
