Apr 30, · Step 1. To nceal the treated deck framing, use cedar 1 x 12s around the perimeter ( Project Diagram, Drawing 6 ). Mark the center of each side of the deck and then cut the ends of the short fascia (I) and long fascia (J) at 45-degree angles. Clamp them to the deck and mark the rners of the deck where they need to be mitered to wrap the deck