Metal roofing can be installed without removing old roofing. Corrugated galvanized metal is steel that has been dipped or coated to prevent rusting. This is also called galvanizing. This will make the steel last longer and prevent it from corrosion. Any steel that has been exposed to the outside conditions are protected due to the galvanizing. Corrugated Metal Roofing with galvanization should last for a long time as long as it is not under constant extreme conditions, such as acidic rainfall. These roofing sheets can be purchased in a wide range of colors. Roofing sheet can also be applied right on top of old roofing. Corrugated metal sheets are very reasonable in cost. The curve sheets helps to bring a unique design to any structure. They are often used on businesses to bring a professional look and appeal.