Why do I need copper flashings and stainless steel nails instead of galvanized metal?
A. If your home is within a few miles of the ocean the salt air will rot out galvanized metals long before typical roofing products see the end of their useful lives. Near the coast the more expensive copper and stainless products will be often re-usable at the end of a shingle roofs life. If you home is 5 miles or more away from the ocean usually galvanized metals are just fine.