What is Galvalume?

Galvalume is a composite coating layer made from aluminum, zinc, and silicon that is applied to steel substrate sheets in the manufacturing process. This coating protects the underlying steel from rust and oxidation, extending the lifespan of metal roofing panels used in residential and commercial applications across Georgia.

The coating typically consists of approximately 55 percent aluminum, 43.4 percent zinc, and 1.6 percent silicon. When exposed to weather, this alloy creates a naturally protective layer that slows corrosion through a process called galvanic protection, where the zinc and aluminum sacrifice themselves to shield the base steel. This self-healing quality means minor scratches or exposed edges do not immediately compromise the panel's durability.

Galvalume outperforms standard galvanized coatings in many climates because the aluminum component provides superior corrosion resistance in areas with salt spray, industrial pollution, or high humidity. The zinc portion delivers rapid initial protection, while the aluminum extends the overall service life. For this reason, metal roofing contractors in Georgia frequently specify Galvalume-coated panels in coastal regions, near industrial areas, or in environments where extended weathering resistance is important.

The thickness and quality of the Galvalume coating directly affect panel longevity and warranty periods offered by manufacturers and installers.