I have built 5 of these frames for my vegetable garden. The first two have held up so well, I decided to build two more and take the time to document the project. depending on the price of cedar, they cost about $55 each.
Step 1: Materials and Hardware Needed
6 - 1 x 4 x 8 Cedar boards
2 - 1 x 2 x 8 Cedar boards
4 - Simpson Strong-Tie Z-Max 7 in. 16-Gauge Steel L-Angle
32 - #8 x 1-1/4in Deckmate screws are used to attach the support pieces
32 - #6 x 3/4in for attaching the L-Angles
Step 2: Cutting Lumber To Size
You will need (6) 1X4x8 cedar boards. Four of them will be used at full length. Cut two of them in half. In this case, I am making two frames therefore there are four sets in the photo.
Step 3: Make Support Members
You will also need (16) 1 x 2 x 7in pieces cut from an eight foot piece for support members. Drill (2) 1/8in holes in each piece. On the centerline and in 1-1/2in from each end.
Step 4: Assemble Side Rails
Using 2 full length boards edge to edge and side by side with the rough side in, attach one Simpson Strong-Tie Z-Max 7 in. 16-Gauge Steel L-Angle to each end using the short side of the L-Angle. Attach using the #6 x 3/4in screws.
Next, turn assembly over so that the rough side is facing up, using two screws each, attach 5 of the 1 x 2 x 7 brace pieces: one on each end placed 1in from the end, one in the center and two at 24in from the center. Attach using the #8 x 1-1/4in Deckmate screws.
Repeat for the opposite side rail.
Step 5: Assemble End Rails
Using 2 48in boards edge to edge and side by side with the rough side facing up, using two screws each, attach 3 of the 1 x 2 x 7 brace pieces: one on each end placed 1in from the end and one in the center.
Repeat for the opposite end rail