When selecting coated steel for your project, Galvalume steel and Aluminized steel are two top contenders — each with unique strengths depending on how and where the material will be used. While they may appear similar, the differences between them can impact durability, performance, and cost.
We’ll help you understand the key differences so you can choose the right material for your specific application. If you have any questions, feel free to contact us.
Galvalume Steel at a Glance
Composition:
Galvalume is coated with a mix of 55% zinc, 43.4% aluminum, and 1.6% silicon.
Best For:
- Outdoor structures like roofing, siding, and carports
- Agricultural buildings and HVAC systems
- Projects where long-term corrosion resistance is essential
Advantages:
- Outstanding corrosion resistance, especially in outdoor and coastal environments
- Bright, spangled appearance
- Self-healing properties at cut edges (thanks to the zinc component)
Limitations:
- Not suitable for contact with concrete or pressure-treated wood
- May discolor in high-heat applications
Learn More about our Galvalume Steel
Aluminized Steel at a Glance
Composition:
Aluminized steel is carbon steel coated with pure aluminum or an aluminum-silicon alloy via a hot-dip process.
Best For:
- High-temperature applications like exhaust systems, ovens, and heat shields
- Projects requiring radiant heat reflectivity
Advantages:
- Excellent performance in high-heat environments
- Good corrosion resistance under elevated temperatures
- Reflects heat and light well
- Smooth, matte silver finish
Limitations:
- Less effective than Galvalume in salt-rich or coastal environments
- Cut edges are more vulnerable to corrosion
Learn More about our Aluminized Steel
Side-by-Side Comparison
Feature | Galvalume | Aluminized Steel |
Coating | Zinc + Aluminum + Silicon | Aluminum or Aluminum-Silicon |
Corrosion Resistance | Excellent for general outdoor use | Excellent in high-heat environments |
Heat Resistance | Moderate | High |
Edge Protection | Strong (self-healing) | Less effective |
Common Uses | Roofing, siding, HVAC, carports | Ovens, mufflers, heat shields, furnaces |
Appearance | Bright, spangled finish | Smooth, matte silver |
Cost | Typically lower | Typically higher |
Which Should You Choose?
- Choose Galvalume if your project is exposed to outdoor elements and you need strong, cost-effective corrosion resistance — especially in humid or coastal regions.
- Choose Aluminized Steel if your application involves sustained high temperatures or requires superior heat reflectivity, such as in ovens, mufflers, or industrial furnaces.
Both materials offer outstanding performance — but for different scenarios. By considering your application’s temperature exposure, environment, and performance demands, you can make the right choice for your project.
Need help deciding? Our experts at Hascall Steel are here to guide you toward the best material for your specific needs.