GC/AAA Fences Cedar Board Fence panels are made with 1" x 4" white cedar boards, fastened with aluminum ring shanked nails to 2" x 3" or 2" x 4" white cedar square or moulded doweled back rails. The top can be scalloped or crowned and a cap strip may be added to accentuate the surroundings. There are different post options available from the basic bevel top cedar or pressure treated to 5x5 or 6x6 cedar or pressure treated with post caps. Tapered panels offer a smooth transition from high to low.