Galvalume Roof Rusting

For these reasons galvalume metal roofs are much more popular.

Galvalume roof rusting.

Galvalume and galvanized steel roofing are affected differently by corrosion. 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. 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.

Corrosion is the death of metal roofing as we all know. 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. How to repair a rusted metal roof.

Galvanized metal roofs may also be used by architects looking for a traditional rusted appearance in a new building. Aluminum has tremendous corrosion resistance so it will generally corrode more slowly than galvanized steel. Answer by joe miller to follow up. 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.