Galvalume Roof Rusting

Galvalume and galvanized steel roofing are affected differently by corrosion.

Galvalume roof rusting.

If your roof were to rust and it s under warranty then attempting to clean off or coat the rusted area may void your roof s. How to repair a rusted metal roof. The mixture of zinc and aluminum protects the galvalume metal against corrosion and rust helping galvalume typically last much longer than galvanized steel. Answer by joe miller to follow up.

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

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. Typically galvanized sheet roofs are used mainly for agricultural buildings where rust is less of an issue and costs must be kept low. Via abc metal roofing. The one exception is when the coating is penetrated scratched or chipped by falling or blowing debris for example.

For these reasons galvalume metal roofs are much more popular.