Galvanized Zinc Roof

It is a coating thickness designation in the galvanizing specification astm a653.

Galvanized zinc roof.

Galvanized g90 g90 is not a galvanizing specification. Before the introduction of galvalume to the metal roofing industry in the late 20th century using galvanized sheet and coil was a common practice. In most cases when someone refers to galvanized metal roofing they are specifically referring to an inner metal layer of iron and carbon alloy steel that has been dipped in a hot zinc bath and is now coated with a thin layer of the material. However paint on metal roofs often peels or rusts in which case it is time to repaint it.

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. Zinc coating weights are measured in ounces per square foot and range from g90 to g60 g40 and g30 galvanized steel. 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.