1910.29(b)(1) - A standard railing shall consist of a top rail, an intermediate rail, and posts, and shall have a vertical height of 42 inches, plus or minus 3 inches, above the working-walking surface. 1910.29(k)(1) - A standard toeboard shall be 3 1/2 inches in vertical height from the top edge to the bottom level of the floor, platform, runway, or ramp.