Does anyone know any titles and/or authors of any deck building books. I currently have a 12'X14' second floor deck but was told not to even try to put our intended 500 gal spa on it. I'd like to tie it into the upper deck posts and I guess pour concrete piers under the joists that will be supporting the spa. The lower deck will be the same size as the upper with handrails and steps on either side. Any info will be appreciated. Hopefully the book will have weight ratings or recommendations for the correct lumber.