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C1008/1010 CRS Steel Sheet - (ASTM A366) Cold Rolled Steel Sheets are rolled to a close thickness tolerance and possess a fine, smooth surface providing a excellent base for painting . CRS Steel Sheets are easy to weld, form, drill. Exposed sheet metal edges shall be hemmed and shall not be left raw cut with the exception of field fabricated joints found at corners. The top edge of the base flashing need not be hemmed when covered by a cap flashing. Individual sheet metal flashing pieces shall not exceed 3000mm (10 ft.) in length (Also see 8.5.2.4).