Comparison
Galvalume (GL) vs ZAM Coating for Solar Mounting Structures
Both are advanced metallic coatings that outperform plain zinc, but ZAM's magnesium content gives it self-healing behaviour at cut edges that matters in aggressive environments.
| Specification | Galvalume (Al-Zn) | ZAM (Zn-Al-Mg) |
|---|---|---|
| Composition | ~55% aluminium, ~zinc | Zinc-aluminium-magnesium |
| Cut-edge protection | Limited at exposed edges | Self-healing at cut edges |
| Corrosion performance | Strong in many environments | Superior at lower coating mass |
| Coastal suitability | Good | Very good |
| Relative cost | Moderate | Higher |
Frequently asked questions
- Why does ZAM resist corrosion at cut edges?
- The magnesium forms a stable protective layer that 'self-heals' exposed edges, giving better performance where members are cut or drilled.
Not sure which to choose?
We will recommend based on your site and load case.