R 408.41129 Double-cleat ladders; width; additional rail; side rails .

Rule 1129. (1) The width between outside rails of a double-cleat ladder shall be not less than 38 inches or more than 46 inches . (2) A double-cleat ladder shall have an additional rail located at the center of the ladder (3) The side rails and middle rail for a double-cleat ladder shall be not less than nominal 2-inch by 4-inch construction grade lumber for double-cleat ladders less than 12 feet in length and not less than nominal 2-inch by 6-inch construction grade lumber for a double-cleat ladder from 12 feet to 24 feet in length . (4) The side rails of a double-cleat ladder shall be secured at the bottom and as close as possible to the top to prevent moving or toppling .