If you ask an old mason about roofing, he will likely mention “GI Sheets” (Galvanized Iron). For decades, this was the standard. But technology has moved forward. At Kanakdurga Technokraft India, we have replaced traditional galvanizing with Al-Zn (Aluminum-Zinc) Alloy Coating. To understand why this is a massive upgrade, we need to look at how these metals behave over twenty years.
The Problem with Simple Galvanizing
Galvanized sheets are coated only with Zinc. Zinc is great at protecting steel, but it is a “sacrificial” metal—it dissolves slowly to protect the iron. Once the Zinc layer is gone (which happens quickly in the salty air of Mecheda or Kolaghat), the steel begins to rust immediately.
The Al-Zn “Double Layer”
KD Sheets use a sophisticated alloy of Aluminum and Zinc.
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The Aluminum Barrier: Aluminum provides a permanent physical barrier. It doesn’t dissolve like Zinc; it stays as a tough oxide layer that moisture cannot penetrate.
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The Zinc Security: The Zinc in the alloy still provides that sacrificial protection at the cut edges and screw holes.
Longer Erosion Life
Because of this “Teamwork” between the two metals, KD Sheets offer Improved Erosion Coating. Scientific tests show that Al-Zn coated steel lasts 2 to 4 times longer than traditional galvanized steel in the same environment. This makes KD Sheets the most cost-effective choice because you won’t have to replace your roof for decades.
Conclusion
Don’t settle for 1980s technology for your 2026 home. Choose the Al-Zn coating of KDT India and give your building a “Longer Life” that saves you money and stress in the long run.
