Is aluminum roofing more corrosion resistant than steel roofing?

Yes, aluminum roofs are significantly more corrosion-resistant than steel roofs, even those that are galvanized. The secret lies in the natural chemistry of each metal. Steel, an alloy of iron, rusts when exposed to oxygen and moisture. To prevent this, steel is coated with a protective layer such as zinc (galvanization) or paint. However, if this layer is scratched or damaged, the underlying steel becomes exposed and begins to rust immediately, and the rust can spread beneath the coating. In contrast, aluminum has an amazing self-protection mechanism. Upon exposure to air, it instantly forms a very thin but extremely hard and durable layer of aluminum oxide on its surface. This layer is invisible and protects the metal beneath from further corrosion. Most importantly, if the surface is scratched, this protective layer immediately re-forms, making it "self-healing." This natural property makes our aluminum roofs and facades the perfect choice for coastal areas with salty air, industrial environments, and anywhere moisture is a concern, ensuring a longer lifespan and a flawless appearance.