If you have purchased corrugated iron roofing sheets for your new home or for the purpose of replace the existing ones currently installed on your home, it is likely that you may have a few excess sheets. If you do, you need to watch out for white rust.

Through years of innovations and development, galvanised steel products have earned a solid reputation for being tough and having a long lifespan. That, however, does not mean that these building materials can handle negligence.

In particular, if you are storing these roofing sheets, you need to make sure that these are stored indoors in a dry environment. Otherwise, if you keep them stacked outdoors or in areas where there is a high level of moisture, you risk exposing these to zinc corrosion or white rust. Zinc corrosion is the result when these roofing sheets are exposed to water without oxygen.

One of the signs that a roofing sheet has white rust is the white deposit that can have a waxy texture when wet, or that is brittle and hard when dry. When you spot this sign, you have to act promptly to avoid long-term damage to the roofing sheet. Typically, the zinc's corrosion occurs on the surface level and rarely seeps down to the metal. However, if you do not act immediately, the zinc can erode and deprive the metal of protection, especially against oxidation. 

Here, prevention is always better than the cure. Make sure that you place the roofing sheets indoors in an area where there is good ventilation. Avoid storing the roofing sheet such that it comes into contact with other materials which may cause the zinc to erode. 

If you notice signs of white rust, remove any material that may be causing the corrosion. If the roofing material has already been installed, prevent it from coming into contact with other types of building materials manufactured with other types of metal.

In order to remove white rust, you should pour vinegar on the affected areas and allow it to sit for about five minutes. After that, rinse the affected areas with warm water. In some cases, this will be enough to remove the surface stains. After that, you can apply a coating of either a zinc-rich water- or solvent-based primer.

However, if the vinegar cannot remove the white rust, you will need to scrub it off using sandpaper. After that, you will need to rinse the affected area with warm water and dry it using a clean rag. Only after that can you apply zinc-rich primer. Once the roofing sheet has dried, you can apply a layer of exterior paint.

If you are looking for a trusted BlueScope Supplier, Bayside Roofing Materials promises the lowest prices and fast deliveries.