These are great screws in their own right. I love them for pocket hole joinery but I also am using them to hang new windows. The self tapping is terrific, the pan head does not go through the plastic flashing, the the square drive holds the screw securely while I am one handed drilling them while hanging onto the ladder! I do not think they are weatherproof but after flashing and the trim, they will be protected enough. High quality screws, never have had one strip one me and the self tapping has NEVER caused the board to split even right near the edge.