Instructables
Picture of Cedar Raised Bed Frame
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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.
 
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Step 1: Materials and Hardware Needed

Picture of 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

Picture of 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

Picture of 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

Picture of Assemble Side Rails
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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

Picture of 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