Metal roofing is generally made of steel, aluminum, or copper. Rolls of 24- or 26- gauge steel sheets are given a metallic coating to prevent rust, followed by a baked-on paint finish. Aluminum sheets don’t require the metallic coating but do get painted. Copper is neither coated nor painted and weathers without corroding. It is sometimes used for special features, such as the roof of a prominent window, gutters and downspouts. Steel roofing products are coated with either zinc (galvanized) or a mixture of aluminum and zinc (galvalume or zincalume). Of the two, galvalume offers the longest life. The coatings are offered in multiple thicknesses.

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