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Great project you have going. Your question for tips on screwing the corrugated roofing panels on an existing patio cover is something you definitely can do yourself. First you need to pre-drill the holes on the corrugated roofing panels. Start by placing one panel at a time on the rafters and cross brace. Place the closure strip on top of the corrugated metal and drill through the closure hole in the valley. This uses your closure strip like a template and ensures the panels and closure strips are aligned. You can screw/nail the closure strip to the cross braces using exterior rated fasteners.
Measure the length you need to cut, starting at one end of the corrugated plastic roofing sheet. Mark a cut line along the right and left sides and along the middle of the sheet, using a felt-tipped pen. Line up a straightedge with the marks you made on the roofing sheet. Use your felt-tipped pen to draw a straight line on the sheet. Attach a carbide saw blade to a circular saw or multipurpose cutting tool. Cut along the straight line you drew on the roofing sheet. Smooth the cut edge, using an emery cloth.