Section 408.10528. Ladder jack scaffolds.

(1) A ladder jack scaffold shall be used on a Type 1, sometimes-called heavy duty, manufactured ladder only, and at heights not more than 20 feet from the ground or floor level.

(2)   The span of a wood plank shall be not more than 8 feet between ladder jacks, and the planking shall be as prescribed in R 408.10512.

(3)   The span of a pick shall not exceed 24 feet.

(4)   A ladder jack scaffold shall be limited to 2 employees at any 1 time, except if 3 ladders support the plank, then 3 employees may occupy the plank. Not more than 2 employees shall occupy any given 8 feet of plank at any 1 time.

(5)   A ladder used with a ladder jack shall be equipped with nonslip feet pursuant to General  Industry  Safety   Standard    Part   4   “Portable   Ladders,”   as    referenced   in R 408.10509.

(6)   A ladder jack shall be made of metal with a designed strength to sustain the load as prescribed in R 408.10513(1). A ladder jack shall be designed to bear on the side rails in addition to the rungs, or if bearing on the rungs only, the bearing surface shall be not less than 10 lineal inches on each rung.

History: 1979 AC; 2008 AACS; 2016 MR 16, Eff. Aug. 18, 2016.