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Cut two sets of the 8-foot 2x4s (eight pieces) to fit around the top perimeter of the four posts. Attach one set of the boards to the outside of the posts with lag bolts. The second set of 2x4s will be used to make the frame of the roof structure.
Attach the second set of 2x4s together in a square. Cut a 4x4 to run across the middle of the square to serve as a horizontal support beam. Fasten all the pieces together with framing nails. This will be the base of the roof structure.
Determine the pitch of the roof from the peak to corner. (Our roof overhangs by approximately one foot on all sides.) Determine the height from the middle horizontal support beam to the roof’s peak. Cut a 4x4 to this height. At the top end of this post, cut a notch on all four corners. Fasten the post vertically to the top of the horizontal support beam so that the flat sides are facing the corners of the roof frame.
Cut four 4x4 posts the length of the pitch (from the peak to the corners, or past the corners depending on how much of an overhang). At the peak end of the post, cut the posts at angle to meet the notch in the vertical post. Pre-drill the posts and fasten them together with lag bolts.
For extra support, cut a 4x4 to fit in each corner of the frame attaching the pitched posts to the 2x4 square frame. The bottom of the small support post should sit flush with the bottom of the square frame and the top should be angled up to meet the angle of the post. Lag bolt the pieces together.
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