Galvalume Roof Rusting

Via abc metal roofing.

Galvalume roof rusting.

Corrosion is the death of metal roofing as we all know. How to repair a rusted metal roof. Galvalume and galvanized steel roofing are affected differently by corrosion. The one exception is when the coating is penetrated scratched or chipped by falling or blowing debris for example.

Consequently galvalume and galvalume plus will resist rust the elements and fire while providing a sturdy and protective covering. 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 is more corrosion resistant than galvanized steel but because aluminum provides barrier protection instead of galvanic protection scratches and cut edges are less protected. The mixture of zinc and aluminum protects the galvalume metal against corrosion and rust helping galvalume typically last much longer than galvanized steel.

Typically galvanized sheet roofs are used mainly for agricultural buildings where rust is less of an issue and costs must be kept low. Aluminum has tremendous corrosion resistance so it will generally corrode more slowly than galvanized steel. Answer by joe miller to follow up. On top of the galvalume is a layer of stone texturing coated with acrylic resin that ensures a completely nonporous water proof uv resistant surface that won t rust or corrode.

Compared to shingles or rolled roofing metal roofing is easy to install and it can last for 20 years or more but it is susceptible to a defect that never.