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Step 4: Inner Frame Joists
From 8' lengths, cut five pieces of 2" x 6" x 7' 9" lumber rated for outdoor use for the floor joists. Measure from the outer rear corners
of the frame, and locate the centers of the inner floor joists at 16", 32", 48", 64" and 72". Use two 12d 3 1/4" galvanized common nails
to secure each end of the inner floor joists to the side rim joists. Measure the gaps between the inner floor joists and cut lengths of 2" x
6" lumber rated for outdoor use to fit between each pair of joists. Nail the blocks into place near the middle of the floor joists. Every
second block should be offset slightly to facilitate nailing.
Step 5: Plywood Floor
Set one 4' x 8' sheet of 3/4" CDX plywood on the frame, with one edge of the sheet flush with the rear rim joist. Use the plywood as a
guide to square up your frame. The front edge of the plywood sheet should fall exactly at the center of the floor joist that was secured
at 48" on center. Fasten the plywood to the joists with 1 5/8" #6 coated deck screws at 8" intervals around the perimeter and at 12"
intervals in the center of the plywood. Mark and cut the second sheet of 3/4" CDX plywood in half lengthwise. Put one half aside for
later use as the door. Set the other half on the floor joists next to the full plywood sheet, leaving a 1/16" gap between the two sheets.
Secure the half-sheet to the floor joists with 1 5/8" #6 coated deck screws.