Galvalume Roof Coating

Galvanization or commonly referred to as galvanized is a protective zinc coating that is applied to a steel or iron substrate through a hot dip galvanizing process.

Galvalume roof coating.

Steel coated with galvalume appears similar to galvanized steel but with a smoother appearance. However wear occurring along the roof s drip edge where all the water and snow run off will eventually wear away the aluminum coating once the paint finish fails and rust will ensue. The coating used on galvalume is very important because it is critical to the length and conditions of the entire warranty of the panel product. Normally galvalume is offered in both bare and pre coated pre painted versions.

The mixture of zinc and aluminum protects the galvalume metal against corrosion and rust helping galvalume typically last much longer than galvanized steel. Major applications are for metal building components including roofs side sheets and structural members. Normally the term used is galvanized steel but. Before the introduction of galvalume to the metal roofing industry in the late 20th century using galvanized sheet and coil was a common practice.

Galvalume az steel is a coated product contains approximately 55 percent aluminum 43 percent zinc and 2 percent silicon. Galvanization only includes the zinc alloy. Arcelormittal galvalume plus is an unpainted steel sheet product that starts with our galvalume substrate and its highly corrosion resistant 55 aluminum 45 zinc alloy hot dipped coating. Galvalume metal roof and siding panels are coated with a mixture of zinc and aluminum and siliconized coating to help resist scuffs and fingerprints better than a bare metal product.

Galvalume has an excellent performance lifespan in bare exposures unpainted panels as well. A clear organic resin coating is applied to both sides of the substrate using sophisticated reverse roll coaters. The aluminum is what differentiates galvalume from galvanized steel. Coated metal roof panels have progressed from a single coat straight polyester paint system in the early years to poly vinyl idene fluoride pvdf acknowledged as the premium resin for coil coatings.

Nearly all steel has a protective coating to prevent corrosion. The coating weight of the product is preceded by az which is the designation for galvalume. Most residential grade galvalume metal roofing products like galvanized steel are coated with kynar 500 or hylar 5000 paint finishes. Galvalume has a coating of aluminum over the steel and will likely take more time for rust to occur at the exposed locations of the panel.