WAC 296-874-20024. Make sure stairway-type ladders meet these requirements

(1) You must make sure stairway-type ladders meet all of the following: (a) Position the bottom step not more than twenty-four inches (61 cm) above the scaffold supporting level; (b) Have rest platforms not more than twelve feet (3.7 m) apart vertically; (c) Have slip-resistant surfaces on treads and landings; (d) Have steps that: (i) Are at least sixteen inches (41 cm) wide; and (ii) Line up vertically between rest platforms. (2) You must make sure mobile ladder stands have steps that are at least eleven and one-half inches (30 cm) wide.