Galvalume Vs Galvanized Metal Roof

Galvalume is roughly twice as resistant to rust and corrosion as the steel used for corrugated metal roofing because of this special galvanizing process.

Galvalume vs galvanized metal roof. Iron or steel can be coated with zinc. 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 answer lies in the difference between the two. Similar to galvanized steel galvalume is produced by a hot dip process.

Traditional galvanized metal roofing is a corrugated sheet of carbon steel with a galvanized coating. 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 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 metal is a high performing option for environments that frequently experience high temperatures and high amounts of precipitation and marine environments.

Galvalume metal roofs offer better surface protection than galvanized roofs however they re more vulnerable to scratches blemishes and cut edges. Most galvalume like galvanized steel is coated. 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. The combination of aluminum and zinc is used once again as a protective layer to the steel.

Most galvalume metal roofs come with a 25 year warranty if the metal roofing manufacturer is using galvalume with a full az55 coating. 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. Studies show that when used on a residential house that a galvalume metal roof will outlast a galvanized metal roof by almost double. Zinc bonds with the steel surface to create a barrier to corrosion causing moisture.

The zinc acts as a protective layer to iron or steel to prevent rust. The zinc ions bond with iron molecules in the steel to create a shiny rust resistant finish on its surface. Instead of 100 zinc the dip is 55 aluminum 43 5 zinc and 1 5 silicon. The coating is created by dipping the straight sheet in hot molten zinc.

This is known as a galvanized metal.