1011.14.2 Treads of alternating tread devices.
BC § 1011.14.2
Alternating tread devices shall have a minimum tread depth of 5 inches (127 mm), a minimum projected tread depth of 8 1/2 inches (215.9 mm), a minimum tread width of 7 inches (177.8 mm) and a maximum riser height of 9 1/2 inches (241.3 mm). The tread depth shall be measured horizontally between the vertical planes of the foremost projections of adjacent treads. The riser height shall be measured vertically between the leading edges of adjacent treads. The riser height and tread depth provided shall result in an angle of ascent from the horizontal of between 50 and 70 degrees (0.87 and 1.22 rad). The initial tread of the device shall begin at the same elevation as the platform, landing or floor surface. Exception: Alternating tread devices used as an element of a means of egress in buildings from a mezzanine area not more than 250 square feet (23.2 m 2 ) in area that serves not more than five occupants shall have a minimum tread depth of 3 inches (76.2 mm) with a minimum projected tread depth of 10 1/2 inches (267 mm). The rise to the next alternating tread surface shall not exceed 8 inches (203.2 mm).
