Definition - What does Galvalume mean?
Galvalume is proprietary steel with a coating consisting of 55% aluminum, 43.4% zinc and 1.6% silicon over the base metal to protect it from the elements. This coating has superior corrosion resistance which gives it two to four times the life span over traditional galvanized metal.
Galvalume is ideally suited for:
- Roofing and siding applications
- Unexposed automotive parts
- Outdoor cabinetry
- Computer cases
Galvalume has gained wide acceptability due to its versatility, ease of use, aesthetics and long-term performance.
Corrosionpedia explains Galvalume
Galvalume has a unique finish that resembles a matte galvanized metal. It also boasts a resin coating that resists scuff marks and fingerprints, allowing a consistent, smooth finish.
Galvalume is a proven metal roofing material because of its strength, outdoor corrosion resistance and longevity. Galvalume should not be used on, in, or around concrete or mortar. Concrete and mortar are highly alkaline environments. Bare Galvalume and painted Galvalume sheets suffer rapid corrosion when in contact with mortar and concrete.
The zinc and aluminum in Galvalume enhance both the positive and negative effects of aluminum. Galvalume has barrier corrosion resistance and heat resistance similar to aluminized material and good bare-edge galvanic protection and forming qualities like galvanized material.
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. Most Galvalume-like galvanized steel is coated. But Galvalume has an excellent performance life in bare exposures as well.