Ladders stairway-type

Stairway-type ladders — such as ladder stands, must have ... 

Stairway-type ladders — must (1) be provided with rest platforms at 12-foot intervals, and (2) have slip-resistant treads on all steps and landings. 

When scaffold platforms are more than 2 feet above or below a point of access, portable ladders, hook-on ladders, attachable ladders, stair towers (scaffold stairways/towers), stairway-type ladders (such as ladder stands), ramps, walkways, integral prefabricated scaffold access, or direct access from another scaffold, structure, personnel hoist, or similar surface shall be used. Crossbraces shall not be used as a means of access. 

Steps and rungs of ladder and stairway type access shall line up vertically with each other between rest platforms. 

Stairway-type ladders shall be positioned such that their bottom step is not more than 24 in. (61 cm) above the scaffold supporting level. Provided rest platforms at 12-ft (3.7-m) maximum vertical intervals a minimum step width of 16 in. (41 cm), except that mobile scaffold stairway-type ladders shall have a minimum step width of 11V2 in. (30 cm). Have slip-resistant treads on all steps and landings. 

A means of rapid egress from a btulding, primarily intended for nse in case of fire. Several types have been used a knotted rope or rope ladder seemed to an inside wall an open iron stairway on the bnilding s exterior an iron balcony a chute and... 

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