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Ship ladders are permitted to be used in Group I-3 as a component of a means of egress to and from control rooms or elevated facility observation stations not more than 250 square feet (23 m2) with not more than three occupants and for access to unoccupied roofs.
Ship 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 no less than 81/2 inches (216 mm). The maximum riser height shall be 91/2 inches (241 mm).
Handrails shall be provided on both sides of ship ladders. The minimum clear width at and below the handrails shall be 20 inches (508 mm).

Related Code Sections

1009.14 Means of Egress, Ship Ladders
Ship ladders are permitted to be used in Group I-3 as a component of a means of egress to and from control rooms or elevated facility observation ...
1009.14 Means of Egress, Ship Ladders
Ship ladders are permitted to be used in Group I-3 as a component of a means of egress to and from control rooms or elevated facility observation ...
1011.15 Means of Egress, Ships Ladders
Ships ladders are permitted to be used in Group I-3 as a component of a means of egress to and from control rooms or elevated facility observation ...
408.3.5 Special Detailed Requirements Based on Use and Occupancy, Ship Ladders
Ship ladders shall be permitted for egress from control rooms or elevated facility observation rooms in accordance with Section 1009.14 ...
R311.7.12 Building Planning, Ships Ladders
Ships ladders shall not be used as an element of a means of egress. Ships ladders shall be permitted provided that a required means of egress ...