Step 13: Attach 2"x4" Diagonal Bracing Boards.

Referencing the locations on the plan, place a 2"x4" board diagonally behind the 4"x4" posts. Using a pencil, mark the angle at each end and cut. Attach 2"x4" diagonal bracing board by toe-screwing two - 2 1/2" deck screws from each side. Repeat this step alternating angles from section to section. Some of the 2"x4" bracing boards near the corners of the deck may need a compound miter cut (a cut angled in two directions - vertically and horizontally).