![]() Next, draw a diagonal line at the 36.5-inch partition of the board. ![]() This line should divide the board into two equal right-angled trapezoids with upper and lower horizontal bases of 22-inch and 74-inch, respectively. You need not make measurements for the coping and steel piece since they’re in an appropriate size already. Place your 3/8-inch board on the ground and length-to-length with your 3/4-inch plywood. Partially, pin one of your 8 feet 2×4 boards on the width side of the 3/8″-inch plywood using a screw. The screw should be 2′ from the corner of the plywood and 6′ from the tip of the 2×4 board. Also, make sure the ground is flat enough to make accurate measurements. Put a pencil on the longer end of the 2×4 that touches the 3/4-inch plywood. Rotate the 2×4 like a clock’s hand as you leave a concave line that almost goes with the diagonal line on the 3/4-inch board. Note that it’s the 11.5-inch portion of the 3/4-inch board adjacent to the 3/8-inch plywood when plotting the two boards down. Step 3: Cut the boards and plywoodīefore doing this step, always remember to protect yourself from cuts and injuries. Begin to cut on the lines you made on your wood components. Be sure to use sharp saws to leave smooth edges. With the two trapezoid boards, cut a 1.625″ right angle at the corner between the upper base and the curve for the coping. Lastly, snap the lower endpoint of the arch, and leave enough height from the bottom side of the board to cover the tip of the 2×4 board.įor easier understanding, let’s visualize the boards in trapezoid shape still after the arch cut. Begin by mirroring your trapezoid boards at a distance equal to the length of your 2×4 boards. Have someone support you as you drill the ends of your 2×4 on the lower tip of your boards’ curves. The broad surfaces should face down and up. Next, put another 2×4 on the bottom and upper right-angled corners of the plywood.
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