cutting galvanized roof panels. use 3-inch white sheet metal screws with neoprene washers on the ridges in the. half-round copper gutter lead coated copper roof panels . download2832 x 1888 . fabricating a galvanized metal panel; manufacturing a white metal roofing sheet . sheet metal roofing panels 55 with sheet metal roofing panels. corrugated roofing sheets metal 24 with corrugated roofing sheets metal.