Galvalume Vs Aluminum Roof

Steel is the most common material used with roofing metal.

Galvalume vs aluminum roof.

Galvalume and galvanized steel roofing are affected differently by corrosion. 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. Galvalume is offered in both bare and pre coated versions. While more expensive than galvalume aluminum roofing is still at a medium price point for metal roofing.

In fact a high end kynar 500 white metal roof is energy star rated and classified as a cool roof by the cool roof rating council. Such a roof can be reasonably expected to be some 50 to 60 degrees cooler than a dark color asphalt shingles roof. The big difference is that aluminum will oxidize chalk if exposed to the elements but the aluminum will not look unsightly and continue on with a rapid oxidation process deterioration rust as steel will. Corrosion is the death of metal roofing as we all know.

This article discusses the different types of metal used in metal roof systems the properties of each metal and their application including galvanized steel roofs aluminized steel roofs galvalume roofing aluminum roofs copper roofs and zinc metal roof systems. Galvalume roofing material combines three of the most important metals used in roofing today steel aluminum and zinc. The one exception is when the coating is penetrated scratched or chipped by falling or blowing debris for example. Manufacturers begin with a carbon steel base sheet that is then continuously hot dipped with aluminum and zinc alloys until it reaches a coating consisting of 55 aluminum 43 4 zinc and 1 6 silicone.

Most galvalume like galvanized steel is coated. Aluminum has tremendous corrosion resistance so it will generally corrode more slowly than galvanized steel. It s also lightweight and easy to form on our end and even more recyclable than galvalume steel which appeals to the environmentally conscious. Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof.

Aluminum roofing comes with paint finishes as well and have their own warranties. Gulf coast goes a step further using an ultra fade resistant pvdf premium paint finish on products such as gulflok gulfseam versaloc and megaloc. Manufacturers fight rust by coating the roofing panels with either zinc or galvalume an alloy of aluminum and zinc to form a protective barrier. Types of metal used in roofing.

It s main benefits for homeowners are. Modern steel roofs are lightweight with very good corrosion resistance.