1011.15.2 Treads of ships ladders.
BC § 1011.15.2
Ships ladders shall have a minimum tread depth of 5 inches (127 mm). The tread shall be projected such that the total of the tread depth plus the nosing projection is not less than 8 1.2 inches (215.9 mm). The maximum riser height shall be 9 1/2 inches (241.3 mm).













