Rust on Your Roof and How Should You Deal with It?

07 September 2017

There are many advantages of corrugated roofing, mainly because it is lightweight and flexible. Compared to other roofing materials, metal roofing can be installed quickly and is the perfect roofing system for roofs with a slope, to help usher away rainwater quickly. Metal roofing is also less expensive than asphalt, clay, and cement tile roofs, which is just another reason why many property owners in Australia prefer this type of roofing option.

While there are many benefits of metal roofing, it still needs to be maintained to ensure long life, but when rust begins developing many property owners aren’t sure how to best deal with it.

How to Deal with Rust on Your Roof

If you have rust or corrosion developing on the corrugated iron roof of your shed, water tank, or car port, or, on your home that has metal roofing that is more than 15 years old, then it is time to do something about it. Corrosion and rust begins to develop on older metal roofing and corrugated iron roofs when moisture comes into contact with unprotected surfaces, after corrosion protectant and galvanised coating wears down.

Basically, the longer metal is exposed to moisture, the faster corrosion and rust will spread. Protective zinc coating on metal roofing will wear down when constantly exposed to harsh weather and environment over time, especially if located near coastal areas. The best maintenance tips for coastal homes with metal roofing is to rinse them down with water regularly, the same as you would a car to prevent corrosion from setting in.

However, if you have already noticed rust developing on your metal roof, there are some things you can do about it:

Mechanical methods of removing rust – using a wire brush or sandpaper is a good way to attack small patches of rust as they appear, but for larger areas of corrosion power tools are more effective. It is only recommended to use abrasive materials to remove rust, otherwise the protective coating on the surface of the metal roof can be stripped away, which can make metal roofing susceptible to corrosion and rust.

Using chemicals to remove rust – this is typically done in preparation for applying corrosion resistant paint, and should be done by professional roofers.

Roof restoration or replacement – this is recommended if too much rust has formed, especially if the roof has begun to leak. If this is the case, contact a professional roofer specialising in metal roofs to inspect your roof, they will recommend whether to restore or replace your roofing with Colorbond® that has five layers of corrosion resistant coating.

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