16 X 20 Patio Cover Plans . Fit 6×6 braces to the ridge beam. Mark the cut lines to the beams and then get the job done with a. 16x24 (4) Carport Patio Covers Awnings San Antonio Best Prices in from carportpatiocovers.com They chose a 16′ x 20′ diy pavilion plan from the shadescape™ series with a full arched knee braces and decorative keystones on all sides. Our first free deck design is a basic 12 x 16 foot deck with footings and a short staircase. Attach the trims to the rafters and insert 2″.