Galvalume vs Galvanized Steel: Which is Better for Corrugated Roofing?
When planning large-scale industrial roofing or agricultural infrastructure, selecting the right metallic coating is critical for longevity and TCO (Total Cost of Ownership). Procurement managers often choose between Galvanized (Zinc-coated) and Galvalume (Al-Zn alloy-coated) steel. This guide compares their metallurgical performance and application suitability for 2026.
1. Composition and Coating Mechanics
Galvanized Steel features a 100% pure zinc coating that provides “sacrificial protection.” If the surface is scratched, the zinc corrodes first to protect the core steel.
Galvalume Steel, however, uses a 55% Aluminum, 43.4% Zinc, and 1.6% Silicon alloy. The aluminum provides a barrier protection while the zinc provides sacrificial protection at cut edges.
2. Comparative Performance Matrix
3. Sourcing Recommendation for B2B Buyers
For residential roofing or coastal industrial warehouses, AZ150 Galvalume is the industry standard due to its 30-year limited warranty. Galvanized steel remains the better choice for environments where high levels of ammonia are present (such as livestock housing) as the Al-Zn alloy can react negatively with high-PH chemicals.
Compare Bulk Rates for GI & GL Roofing
Sino East Steel provides both Hot-Dipped Galvanized and 55% Al-Zn Galvalume roofing sheets with strict mill test certifications.
