Steel is the most common material for metal roofing panels. Steel roofing can refer to Galvalume steel or galvanized steel. Galvalume refers a coating which consists of 55% aluminum, 43.4% zinc, and 1.6% silicone, giving it enhanced during compared to galvanized steel which has a coating of just zinc.
There are different panel options within the steel roof category. Corrugated metal panels are the most affordable type of metal roofing system, costing nearly half as much as standing seam roofing. However, a standing seam panel has maximum weathertightness from the elements, compared to an exposed fastener panel, and is many times preferred over a corrugated metal roof for its clean, contemporary appearance.
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