Galvanized Zinc Roof

Metal wall and roof panels in galvanized g90.

Galvanized zinc roof.

When steel is galvanized it is really just adding a protective layer of zinc to dteel base to protect it from oxidation as steel is naturally corrosive or will rust when exposed to salt water or moist environment over a long period of time. Many metal roofs are made out of galvanized metal which is a type of metal that has been covered with hot zinc in order to protect it from the weather. 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. Before the introduction of galvalume to the metal roofing industry in the late 20th century using galvanized sheet and coil was a common practice.

It is a coating thickness designation in the galvanizing specification astm a653. Galvanized g90 g90 is not a galvanizing specification. Zinc coating weights are measured in ounces per square foot and range from g90 to g60 g40 and g30 galvanized steel.