Galvalume Vs Aluminum Roof

Aluminum has tremendous corrosion resistance so it will generally corrode more slowly than galvanized steel.

Galvalume vs aluminum roof.

Modern steel roofs are lightweight with very good corrosion resistance. Galvalume roofing material combines three of the most important metals used in roofing today steel aluminum and zinc. Corrosion is the death of metal roofing as we all know. The one exception is when the coating is penetrated scratched or chipped by falling or blowing debris for example.

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. Steel is the most common material used with roofing metal. Galvalume and galvanized steel roofing are affected differently by corrosion. Paint finish warranties are key to understanding the expected longevity of a galvanized or galvalume metal roof.

Manufacturers fight rust by coating the roofing panels with either zinc or galvalume an alloy of aluminum and zinc to form a protective barrier. The term usually refers usually to one of the zinc coated steels galvanized galvalume zincalume etc and here s a rundown on its attributes. 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. 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.

Types of metal used in roofing. Galvalume is offered in both bare and pre coated versions. 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. Steel roofs are usually supplied with a colored finish.

Most galvalume like galvanized steel is coated. 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. We also carry aluminum roofing. Gulf coast goes a step further using an ultra fade resistant pvdf premium paint finish on products such as gulflok gulfseam versaloc and megaloc.

Aluminum roofing comes with paint finishes as well and have their own warranties. Such a roof can be reasonably expected to be some 50 to 60 degrees cooler than a dark color asphalt shingles roof.