Should You Expect Rust with Colorbond Roofing

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Repairing and maintaining your roof can add significant costs annually, which is why many property owners are looking for less pretentious and more durable roofing materials. Modern roofing systems are designed to last for many years without needing much maintenance, and Colorbond steel roofs are a perfect example.

What Is Colorbond Roofing?

Metal roofs are not a new thing; copper roofs were used many centuries ago by the Romans, Indians and other cultures. Although tile roofs like terracotta or concrete are still regarded as the first choice in terms of roofing products, metal roofing is gaining ground because it has numerous advantages over more traditional roofing.

One of the most performant roofing materials on the market is Colorbond, a steel roof that is bonded with a paint finish. It was developed by the company BlueScope Steel, a leader on the Australian roofing market, and it is adapted to the needs of an Aussie home. Compared to other roofing, it is more lightweight, easy to maintain, weather-resistant and cost-effective.

In terms of longevity, if asphalt shingle tile roofs are expected to last 15 years, Colorbond roofing can last for over 50 years with minimum maintenance. Its long life is what contributes to a lower cost overall, with low cost of roof restoration and the roofing installed.

How Is Metal roofing So Weather-Resistant?

Adding a protective zinc coating on metal roofs was first done in France, in 1837, which led to a convenient material to cover train sheds, factories, and other large buildings. Other ways of protecting metal roofing were developed, and the technology is continuously being improved, with BlueScope Steel investing millions of dollars into research.

The original Colorbond steel had a zinc and aluminum coating under the paint layer, offering the needed protection against oxidation. This product is known as zincalume steel and it did get a few improvements lately. The newest steel products used in construction work have magnesium compounds in the zincalume layer, contributing to the durability of the material.

Although Colorbond is one of the most durable roofing materials out there, the producer recommends setting realistic expectations in case you live in marine or industrial areas, where salt spray or chemical fumes may affect the integrity of the steel. Colorbond steel can corrode faster if exposed to moisture for a long time, or to certain chemicals.

Should You Expect Rust with Colorbond Roofing | City2Surf Roofing

Does Colorbond Roofing Rust?

So here is the big question: does Colorbond roofing rust? The only way that Colorbond will rust is if the metal is exposed, and water must get through many layers of corrosion-resistant coating before it affects the base layer.

Getting the Colorbond steel in contact with any metals other than aluminum, galvanised steel or zinc will contribute to the corrosion of the material. When designing your Colorbond steel, make sure that water coming from lead or copper pipes will not drain over the Colorbond.

Another amazing property of Colorbond steel is its ability to “heal” itself. If you need to drill or cut the Colorbond steel, only use cold cutting. This will allow the zinc in the coating to cover the exposed metal at the edge, protecting it from rust and corrosion. In BlueScope Steel, the zincalume coating is thick enough to provide long-term protection.

Long story short: if you are careful to buy the original Colorbond steel and to hire experienced contractors like our company City2Surf Roofing, who know how to work with it, your Colorbond roof will be safe from rust for a long time.