... custom design to a more traditional common staircases. RISER -- 3/4" thick, various widths, used to create the vertical "rise" in ... trim, landing tread. Thickness is same as flooring( 3/4" or floor material is sometimes used). These are used to create finished ... stairwell, sunken living room, etc. Finished moldings should match your floor or be painted to match other nearby trims. The detail ...