A number of metals are utilized in the construction of metal roofs, each possessing a unique blend of characteristics related to durability, cost, weight, and visual appeal.
Common Metal Roofing Materials
Steel
Steel is the most commonly used metal in roofing due to its exceptional durability and affordability. To shield it from rust, steel is typically treated with a protective coating of either zinc, a process known as galvanization, or a zinc-aluminum alloy. This material is widely available and offered in a diverse range of colors and finishes. While steel is strong and fire-resistant, it is also heavier than other metals and can be less resistant to corrosion if its protective coating is compromised.
Aluminium
For locations near coastlines where salt spray is a concern, aluminum stands out as an excellent choice because of its lightweight nature and high resistance to corrosion. It is naturally rust-proof and capable of reflecting a significant amount of solar heat, which can contribute to lower cooling costs for a building. However, aluminum is a softer metal, making it more susceptible to denting from hail or other falling debris, and it is also more expensive than steel.
Copper
Copper is a premium roofing material valued for its remarkable longevity and distinctive appearance. Over time, copper develops a beautiful blue-green patina, a natural process that adds to its unique aesthetic. It is extremely durable, capable of lasting for over a century, and requires very little maintenance once it is installed. Although it is lightweight and provides a high level of curb appeal, it is one of the most expensive roofing materials and is also a soft metal, making it vulnerable to dents.
Zinc
Zinc also has a natural ability to “self-heal” by forming a protective layer when scratched, making it incredibly durable. It is highly resistant to corrosion and require minimal maintenance, with lifespan that can extend for a century or more. However, its high cost limits its use to more exclusive architectural projects.