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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.

Salt is corrosive to metal, and when it’s mixed with air and water, that corrosion increases. While this compound can cause your car to rust, it takes years to cause damage. However, once you see rust, it’s probably well advanced. Winterize your car and avoid driving before or immediately after ice storms to reduce rock salt effects.

Common materials used include aluminum, stainless steel, galvanized steel, and copper, each selected for their properties suited to specific repair needs.

The lifespan of a roof patch depends on which materials you use and the severity of the damage. Temporary solutions like tarps or plastic sheets last a few weeks to a few months, while roofing tape or caulk may hold up for a year or two. Permanent patches using roofing cement, flashing, or replacement shingles can last several years as long as they're properly maintained. Regular inspections and touch-ups can extend the patch’s lifespan, but eventually, a full repair or replacement would be needed.