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Metal roofs have an excellent reputation for longevity. Including aluminum roofing, you can expect a metal roof to last between 40 and 80 years under normal conditions and with proper maintenance. That longevity can shorten in areas where salty air is a concern and not accounted for during installation to provide additional material protections. 

Yes, you can salvage grill grates with some surface rust. Simply apply a commercial rust remover or a homemade vinegar, baking soda, or lemon juice paste with a wire brush or steel wool. After removing the rust from the metal, you can then apply a thin layer of rust-preventing oil to keep the grates looking good as new for longer. However, grate replacement is often better when the rust is deep.

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.

Depending on the condition of your roof, you may be able to add flashing to it. If you’re looking for a way to maintain its integrity while saving some money, you should ask a roofing pro if this is an option. Keep in mind that if your roof is in poor shape, a full replacement may be necessary before flashing is installed.