I need a little input for putting storage above my garage. I have a 3 car garage 22x22 with a wall separating a 12'6 x 22 single garage. The joist are 2x8's in the 22x22 garage and 2x6's in the 12'6 garage. Joist run parallel to the length on both garages with the 2x6s spanning the 12'6"...