Galvalume Finish Corrugated Metal Roofing
Galvalume finish corrugated metal is one of the most corrosion resistant corrugated materials offered in the architectural roofing and siding panel market. Unlike normal galvanizing, this metal material is an actual combination of aluminum and zinc to provide excellent protection. Galvalume-finished corrugated metal will give you a great product that lasts longer than the traditional galvanized finish. The corrosion resistance of this corrugated metal will make this the ideal product for almost any application, by marrying the lightweight aspect and advantage of aluminum, with less chance of the material corroding at the normal stress points, and areas where rusting can start.
GALVALUME® Steel Sheet is carbon steel sheet coated with aluminum-zinc alloy by a continuous hot-dip process described in Production Methods. The nominal coating composition is 55% aluminum and 45% zinc. A small but important amount 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 sheets combine 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 sheets. Although there are a few exceptions, for most applications in most types of environments GALVALUME steel sheet is the preferred product for long-term resistance to atmospheric corrosion. 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 conditions. 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.
In most cases we offer only certain styles and profiles in the galvalume material but are adding new products daily. Please feel free to call and request your next application in galvalume and we can always quote your particular job using the material. Galvalume is one of the best materials that one can use for the extreme outdoor applications that are required today, and since it is cheaper then stainless, and more corrosion resilient then galvanized – Galvalume is the choice!