Project descriptionAdd a 16-by-20-foot deck using pressure-treated SYP joists supported by 4x4 posts set into concrete footings. Install composite deck material in a simple linear pattern. Include a built-in bench and planter of the same decking material. Include stairs, assuming three steps to grade. Provide a complete railing system using either a matching system made of the same composite as the decking material or a compatible vinyl system.