Ladder jack scaffolds shall not be used unless approved.

Ladder jack scaffolds shall be used only as light duty scaffolds. The scaffold platform elevation of any ladder jack scaffold shall not be more than 20 feet above the floor or equivalent surface.

Ladders used in the construction of ladder jack scaffolds shall be designed, constructed and maintained in accordance with the provisions of this Part (rule) pertaining to ladders. Such ladders shall be so placed, fastened or held, or shall be so equipped with acceptable means as to prevent slipping. Platform planks shall be not less than two inches thick full size if constructed of wood. Metal planks shall be approved. Any plank used for such scaffold platform shall extend beyond any support not less than six inches nor more than 18 inches beyond any end support. The spans between supports shall not exceed eight feet. No more than two persons shall occupy any ladder jack scaffold at one time.