Galvanized Steel
Interstate Metals uses both AzkoNobel CERAM-A-STAR® 1050 and GALVALUME® sheet steel to produce the best roofing, siding and trim. Our commitment to quality products is paramount.
GALVALUME ® is a steel sheet coated with aluminum-zinc alloy by a continuous hot-dip process. The nominal coating composition is 55% aluminum and 45% zinc. A small but important addition of silicon is included in the coating alloy. It is added not to enhance the corrosion performance, but to provide good coating adhesion to the steel substrate when the product is roll-formed, drawn, or bent during fabrication.
GALVALUME® steel sheet combines the excellent barrier corrosion protection of aluminum with the galvanic protection of zinc. The result is a coating that lasts a long time, a coating that provides cut-edge protection along sheared edges, and therefore, a coating that offers excellent protection to steel sheet. Although there are a few exceptions, for most applications in most types of environment, GALVALUME® steel sheet is the preferred product when long-term resistance to atmospheric corrosion is desired. It outlasts a galvanized coating of comparable thickness, and offers cut-edge protection that is not available with aluminum-coated sheet. This cut-edge protection means there is less rust-staining along sheared edges, at scratches, and other imperfections in the coating. Also, since the coating is so resistant to corrosion, it retains a very bright surface appearance when exposed to most atmospheres.
These attributes make GALVALUME® steel sheet the preferred material for roofing.The superior corrosion resistance of GALVALUME® steel sheet is achieved by the presence of microscopic zinc-rich and aluminum-rich areas within the coating. The aluminum-rich areas, which corrode very slowly, provide the long-term durability while the zinc-rich areas, which corrode preferentially, provide galvanic protection.With GALVALUME®, the aluminum and zinc act together to resist corrosion and provide barrier protection on the sheet steel surface. This means it resists rust and resists cracking and peeling from weather. It also resists cracking and peeling from the roll-forming process when the sheet steel are formed into roofing and siding panels.
Example: Both panels have been scribed and weathered for years. You will see the picture on the left has much more extensive damage than the one on the right. You can clearly see the rust that has formed on the Galvanized panel on the left. Even the bends in the metal have started to rust due to the inferior protection that is provided by a Galvanized roofing panel compared to the GALVALUME® roof panel on the right.
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Galvalume® Steel
To Place an Order Call: 877-346-4449