It is used in the construction of bridges and other structures

Because of the combination of aluminum and zinc, both the positive and negative characteristics of aluminum are accentuated to a greater extent than they would otherwise be. Because aluminum is a highly corrosion-resistant metal in and of itself, galvalume steel is also a highly corrosion-resistant steel; in other words, the aluminum/zinc alloy provides barrier protection rather than galvanic protection in the presence of corrosion. In contrast, the disadvantage of using aluminum as an alloying element is that galvalume does not provide as much self-protection against scratches and cut edges as galvanized steel does in this regard.

The corrosion resistance of galvalume steel is also increased by a process known as tension bend staining, which occurs when the steel is bent while under tension. Galvalume zinc/aluminum and galvanized zinc coatings are applied very thinly over areas of steel that have deep folds or tight bends during the process of forming steel into the various metal roofing profiles. Because of the thinness of the coatings, they have a tendency to form microscopic cracks in the steel during the forming process. As a result of the galvanic action of zinc, galvanized steel is able to provide scratch resistance while causing minimal damage to the surrounding environment. However, because of the presence of aluminum in galvalume steel, some of the galvanic properties of zinc have been diminished, and as a result, the galvalume steel is less effective at protecting itself against cracks and other scratches in general.

Rusting occurs as a result of moisture or other corrosive elements permeating these cracks, allowing rusting to proceed more quickly. As a result, rust stains appear on the metal in areas where the material has been folded or bent. Over time, corrosion will eat away at the metallic coating, causing it to deteriorate even further.

Consequently, galvalume steel is most commonly used in relatively simple metal roof styles, such as standing seam, because the metal does not bend as much when compared to other types of steel; as a result, galvalume steel is less expensive than other types of steel. It is sometimes used unpainted or with a low-cost acrylic clear coat to give a more professional appearance to galvalume steel, which is more corrosion-resistant than galvanized steel due to its higher corrosion resistance. Unpainted galvalume is most commonly used in commercial applications, but some homeowners who prefer the bright, shiny metallic look of unpainted galvalume have also used it in their homes. Unpainted galvalume is available in a variety of colors. In order to increase the durability and aesthetic appeal of galvalume and galvanized steel, the majority of galvalume is painted.

Aspects that make it attractive include its extreme corrosion resistance, strength, and affordability (although it is occasionally slightly more expensive than galvanized steel).

Cons: There are some drawbacks. Due to its susceptibility to tension bend staining, it is only available in a limited number of profiles (mostly standing seam or simple shingle styles); Metal roofing types must be sheared rather than saw-cut; it is only available in a limited number of profiles (mostly standing seam or simple shingle styles).

Standing seam systems are typically constructed of 24 gauge (.024) steel, which is the most commonly used thickness for this type of construction.

The weight per square foot (100 sq. ft.) varies between 100 and 150 lbs depending on the material.

Recycled content accounts for approximately 35% of the total weight.

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