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Metal roofs can rust, but steel is a material that holds up well to environmental factors, especially if it’s painted or galvanized. One of the main determining factors regarding rust is the environment the roof is in. Harsher environments with a lot of salt in the air will rust much more quickly than a steel or metal roof in a dry climate. Zinc-coated steel, called galvanized steel, is excellent at preventing rust from forming.

A metal roof can significantly reduce your energy bills by reflecting heat away from your home, so your cooling system doesn’t need to work as hard to keep the inside cool. After installing a metal roof, you may see up to 40% lower energy costs, depending on how energy efficient your previous roof was and your area’s average climate.

Regular cleaning, rust prevention treatments, and protective coatings extend lifespan and appearance.

The green coloration that develops on copper roofs is called a “patina,” and it’s a result of mild oxidation on the surface. The oxidation process is not harmful to your roof. In fact, the surface corrosion acts as a protective layer and won’t spread to the core of your copper roof materials. The discoloration will progress much more quickly in damp or humid climates than it will in dry climates. If you don’t like the green color, you can seal your roof to preserve the shiny, rose-gold look.