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STEP 1
Assemble The Bottom Frame
1.1 Assemble the frame using 3 1/2" x 3 1/2" pressure-treated material. You will need two boards
cut to 10'-6"' that will be the rim joist and four boards cut to 3'-5" that will be the joist.
1.2 Secure the beams into the frame with 2x5" wood screws.
1.3 Using a speed square or carpenter's square, check the corners to make sure they are 90 degrees.
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