Will a Metal Roof Rust?

These days, the demand for a more structurally sound roof system is only getting higher. Metal roofing has become more and more popular due to its versatility. Compared to non-metal roof systems, it is light weight, fire and wind resistant, energy-efficient and durable. It also has the capability to shed snow easily, unlike non-metal systems, which makes it a superior option for areas with heavy winters!

There are so many great reasons to choose metal roofing – so why do people turn away form it? RUST. Even just the possibility of this occurring scares a lot of people...

When does rust occur?

Rust forms when iron and oxygen react in the presence of water or moisture in the air.

How is metal roofing protected from rust?

Since rust forms through the process of oxidation, there are protective coatings to assist in stopping that process. Zinc is most used as a coating for this- this process is called galvanization – where steel is simply coated with zinc. Once the metal is coated with zinc, it no longer has the ability to react with oxygen and water, therefore stopping the formation of rust.

Another common product used for this is Galvalume. Galvalume is a mixture of aluminum, zinc and silicon; These properties make Galvalume more corrosion resistant. Galvalume is more common in the metal roofing industry since the aluminum in it helps better to protect the panels against corrosion in some environments and provides a smaller, smoother spangle which is more aesthetically pleasing. Another route to go with Galvalume would be getting it in a color. Acquiring this material with an extra baked-on painted coating not only adds more uniqueness to your home, but also can further prevent any reaction with oxygen and water (rust) from happening.