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I suggest you use stainless steel or galvanized screws to secure the 2x to the wall. If the screws will come into contact with any other metals you should use only stainless steel.
Use a good grade of polyurethane to seal the top of your patio cover. This is VERY IMPORTANT! If any water gets behind the patio cover it will get into your wall, rot the framing, damage the insulation, and could cause mold and mildew problems as well. This sealant must be checked on a yearly basis to insure it is still maintaining a water-tight seal.