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While this was a priority with older metallic roofing techniques, modern metal roofs are designed with protective coatings and finishes that prevent rust and corrosion. Steel roofing is typically galvanized or coated with a zinc-aluminum alloy, while aluminum and copper roofs naturally resist corrosion. With proper set up and upkeep, rust and corrosion aren't important considerations for today’s steel roofs. Fans of more conventional profiles can go for a metal shingle manufactured to resemble wood shak