Lay out the cedar two-by-tens for the canopy beams that will span the front and the rear of the arbor. Cut scalloped ends to match those on the side beams. Start at the inner end of each scallop and measure/mark about 12 inches toward the center of the beam. Place these marks on the bottom edge of the beam--they denote the two flat areas on the bottom of the canopy beams that must rest squarely on top of the side beams. In the next step, you will use these marks as references for making the center arch.
