Section R. 408.41218 - Plywood scaffold platformsRule 1218.
(1) If plywood is used as a work platform, the plywood shall be supported by 2- by 10-inch planks. The planks shall support 2 parallel edges of the plywood and shall also be spaced not more than 24 inches center to center.(2) The plywood work surface shall be secured to the planks.(3) If the plywood work surface is a load-carrying member, it shall have a minimum thickness of 5/8 inch.Mich. Admin. Code R. 408.41218