Galvalume Vs Galvanized Metal Roof

Typical g90 galvanized metal roofing can cost anywhere from 5 00 to 13 00 per square foot and can fluctuate further based on thickness color installation costs location and more.

Galvalume vs galvanized metal roof.

The coating is created by dipping the straight sheet in hot molten zinc. Aluminum is a metal that naturally resists corrosion and reflects heat too. Galvalume is aluminum and zinc coated steel. The answer lies in the difference between the two.

Galvalume metal roofs offer better surface protection than galvanized roofs however they re more vulnerable to scratches blemishes and cut edges. Standing seam metal roofs are commonly made from a material called galvalume which is steel that has been super galvanized this super galvanizing coating is an aluminum zinc alloy. Galvalume metal is a high performing option for environments that frequently experience high temperatures and high amounts of precipitation and marine environments. Galvalume is roughly twice as resistant to rust and corrosion as the steel used for corrugated metal roofing because of this special galvanizing process.

Similar to galvanized steel galvalume is produced by a hot dip process. Studies show that when used on a residential house that a galvalume metal roof will outlast a galvanized metal roof by almost double. Most galvalume like galvanized steel is coated. Iron or steel can be coated with zinc.

Most galvalume metal roofs come with a 25 year warranty if the metal roofing manufacturer is using galvalume with a full az55 coating. 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. The zinc acts as a protective layer to iron or steel to prevent rust. The combination of aluminum and zinc is used once again as a protective layer to the steel.

Galvanized while both products were developed to essentially sacrifice themselves to protect the steel sheeting they coat the above exposure comparison shows that galvalume performs up to nine times better in fighting corrosion as compared to galvanized coating. The zinc ions bond with iron molecules in the steel to create a shiny rust resistant finish on its surface. However in the last 20 years the pricing of these two materials has fluctuated back and forth but predictions for november 2019 show galvanized material is about 6 higher in price over galvalume. Traditional galvanized metal roofing is a corrugated sheet of carbon steel with a galvanized coating.

Galvalume is offered in both bare and pre coated versions.