Galvalume vs. Galvanized
Both begin with:
steel.
The difference is the metallic coating protecting that steel.
What Is Galvanized Steel?
Galvanized sheet uses a zinc coating applied to carbon steel.
The zinc helps protect the steel underneath.
What Is Galvalume?
Galvalume uses an aluminum-zinc alloy coating.
ABC describes the coating as roughly 55% aluminum and 45% zinc, combining aluminum’s corrosion resistance with zinc’s galvanic protection.
Which Is Better for Roofing?
It depends on:
- Product
- Environment
- Paint system
- Building design
Galvalume is widely used for modern metal roofing because of its corrosion-resistance characteristics.
The Paint Finish Is Separate
A painted metal roof may include:
- Steel substrate
- Metallic protective coating
- Primer
- Exterior paint finish
So:
Galvalume ≠ paint colour.
Why Homeowners Should Ask
When comparing metal-roof quotes, ask:
- What substrate?
- What metallic coating?
- What paint system?
- What warranty?
“Metal Roof” Is Not a Complete Material Specification.
Envirotech Exteriors can help homeowners compare complete metal-roof systems rather than judging quotes by panel colour alone.