Why the Base Material of Metal Roofing Is a Key Determining Factor of Durability?

In tropical climates, the durability of metal roofing is not determined solely by its exterior appearance or protective coating, but rather by the quality of the base metal material used. Exposure to intense sunlight, high humidity levels, and recurring rainfall accelerates chemical reaction processes in metal. If the base material used has an unstable material structure, corrosion will continue to occur even when the roof is equipped with additional protective layers. Therefore, selecting the right base metal material becomes the primary foundation in determining the long-term durability of metal roofing, especially in environments with extreme conditions such as tropical regions.

What Is BlueScope and Why It Is Relevant for Metal Roofing?

BlueScope is a global steel manufacturer from Australia that is known as a pioneer in coated steel technology, including ZINCALUME® technology. With more than 100 years of experience, BlueScope develops steel through controlled production processes that meet international standards, resulting in materials with consistent composition and stable structure. BlueScope-coated steel is designed to provide optimal protection against corrosion, particularly in environments with high humidity levels and exposure to extreme weather conditions.

In the context of metal roofing, the use of certified steel such as BlueScope provides assurance that the base material used has undergone quality testing and meets national and international standards. This is important because high-quality steel has better natural resistance to oxidation, even before additional protective layers begin to function.

Why COMET Uses BlueScope as Its Base Material?

COMET chooses BlueScope as the base material for its metal roofing due to its consistent material quality and its ability to withstand the challenges of tropical climates. In professional construction practice, long-term durability cannot rely on a single layer of protection alone. By using BlueScope steel as the material foundation, COMET ensures that the metal roofing it produces has strong structural durability starting from its base material.

This approach aligns with the principle that protective layers or coatings function as a supporting system, not as the primary determinant of durability. When the base metal material already possesses high quality and stability, additional protection systems can work optimally and deliver more consistent performance over the long term.

Differences in BlueScope Coating Thickness: AZ100 and AZ150 at COMET.

In COMET metal roofing products, BlueScope is used in two main coating classes, namely AZ100 and AZ150, each designed for different needs and levels of protection. This difference refers to the thickness of the aluminium-zinc (Al-Zn) coating that protects the steel from corrosion processes.

The AZ100 coating provides standard protection suitable for general use in tropical environments. With this specification, COMET metal roofing is equipped with an anti-corrosion warranty of up to 10 years, making it a balanced option between performance and cost efficiency.

Meanwhile, the AZ150 coating has a higher aluminium-zinc thickness, providing a more maximum level of protection against corrosion. COMET’s premium series that uses BlueScope AZ150 is designed to withstand more demanding environmental conditions and long-term use. Therefore, products with this specification are equipped with an anti-corrosion warranty of up to 20 years, as a form of confidence in the durability of the material used.

Material Foundation as a Long-Term Investment

Selecting the right base metal material is not only a matter of technical specifications, but also a long-term investment decision. By using certified steel such as BlueScope and adjusting the AZ coating thickness according to building needs, the risk of corrosion can be significantly reduced, maintenance costs can be minimized, and the protective function of the roof can be maintained over a long period of time. This is why COMET places the quality of the base material as the main foundation in every product it produces, before addressing additional layers or visual aspects.