Galvalume Vs Galvanized Roofing

When we looked gavalume vs galvanized roofing it s important to note galvanized metal roofing is similar to galvalume metal roofing in that the galvanized coating is protecting the steel underneath it from corrosion and rusting.

Galvalume vs galvanized roofing.

From galvanized steel roofing to galvalume metal roofs both finishes reinforce metal s strength performance and increase its longevity. 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. This is known as a galvanized metal. Galvanized metal and galvalume metal both create stunning looks on interior and exterior metal projects.

Aluminum has tremendous corrosion resistance so it will generally corrode more slowly than galvanized steel. Before the introduction of galvalume to the metal roofing industry in the late 20th century using galvanized sheet and coil was a common practice. Galvalume is similar to galvanized steel but instead of coating the steel in zinc oxide it is hot dipped in a mixture of zinc aluminum and silicone. While galvalume can initially show signs of corrosion faster than galvanized it has a sacrificial property that will prevent the corrosion from growing whereas once corrosion has started on a galvanized panel it can continue to corrode until panel integrity is lost.

Galvanized coating accomplishes this with the use of just zinc. For these reasons galvalume metal roofs are much more popular. Two popular roofing materials that use this process of binding two or more dissimilar metals are referred to as galvanized and galvalume each of which use steel as the base metal. Galvalume also has improved corrosion resistance but it also has better heat resistance thanks to the aluminum and silicone.

Galvalume is offered in both bare and pre coated versions. Most galvalume like galvanized steel is coated. The one exception is when the coating is penetrated scratched or chipped by falling or blowing debris for example. The zinc acts as a protective layer to iron or steel to prevent rust.

However because of the superior durability and corrosion resistance of galvalume 90 percent of the metal roofing and wall industry in the early 2000s transitioned from galvanized substrates to a galvalume substrate. Typically galvanized sheet roofs are used mainly for agricultural buildings where rust is less of an issue and costs must be kept low.