Do it 1-1/2 In. 10 ga Hot Galvanized Roofing Nails (107 Ct., 1 Lb.).

Ring shank, hot galvanized nail. Neoprene flat washer. For steel and fiberglass roofing. Neoprene washer seals hole that is made when driven. All sizes are 10-gauge with 7/16" head size. 1 lb. box.