What Is Galvalume Steel?
Galvalume steel is flat rolled steel coated with a unique alloy of 55% aluminum, 43.4% zinc, and 1.6% silicon. This combination offers the best of both worlds: the corrosion resistance of aluminum and the sacrificial protection of zinc.
The result is a material that lasts significantly longer than traditional galvanized steel in many outdoor environments. Galvalume not only provides strength and durability but also cost savings over decades of service life.
Why Builders Prefer Galvalume
Builders often choose galvanized for short-term, budget-sensitive projects and galvalume when long-term performance matters most.
One of the unique benefits of Galvalume is its self-healing ability. When a small scratch occurs or hole is drilled into the material, the aluminum-zinc alloy coating re-seals itself to protect the exposed steel and prevent rust from spreading, unlike galvanized steel where corrosion can quickly take hold. This not only makes it a versatile material for solid exterior panels, but fasteners and fixtures that require extra processing.
Many commercial roofing systems now specify galvalume as standard due to its 40+ year service life. Compared to asphalt shingles or galvanized panels, galvalume provides superior ROI over the building’s functional lifetime.
- Superior Corrosion Resistance
In roofing and siding, galvalume outlasts galvanized steel by two to four times, especially in areas with high humidity or salt exposure.
- Cost-Effectiveness
Its long lifespan reduces replacement and maintenance costs, making it attractive for builders and owners alike.
- Consistent Appearance
Galvalume develops a uniform patina that resists rust streaking and staining.
- Sustainability
Long service life and recyclability make galvalume a more sustainable option than some alternatives.
- Versatility
Available in coils and sheets, galvalume can be roll-formed into panels, corrugated sheets, or structural framing.
Key Applications in Construction
- Roofing
Standing seam panels, corrugated roofing, and agricultural structures.
- Siding and Cladding
Used for warehouses, barns, and commercial exteriors.
- Framing and Structural Components
Purlins, girts, and joists benefit from corrosion resistance.
- Industrial Buildings
Factories, power plants, and utility structures use galvalume for both durability and cost savings.
Galvalume vs. Galvanized Steel: Which to Choose?
Feature | Galvalume | Galvanized |
Coating | Zinc-Aluminum-Silicon alloy | Zinc |
Lifespan (roofing) | 40–60 years | 15–25 years |
Corrosion Resistance | Excellent | Good |
Cut Edge Protection | Moderate | Strong (zinc sacrifices at edges) |
Paintability | Fair to good | Good |
Cost | Slightly higher upfront | Lower upfront |
FAQs About Galvalume Steel
How long does galvalume roofing last?
Galvalume roofs can last 40–60 years depending on climate and maintenance.
Is galvalume better than galvanized for roofing?
In most cases, yes. Galvalume generally offers two to four times the service life of galvanized in outdoor conditions.
Can galvalume steel be painted?
Absolutely. Pre-painted galvalume panels are common, though proper prep is needed for painting on-site.
Does galvalume work in coastal areas?
It performs well in many coastal regions, but extreme salt exposure may require stainless steel for maximum longevity.
Is galvalume environmentally friendly?
Yes. Its long service life reduces replacement waste, and it is fully recyclable.
Why Order Your Galvalume Steel from Hascall?
In today’s volatile steel market, having a dependable partner matters more than ever. Hascall Steel stands apart as a non-traditional service center with one of the largest unallocated inventories in the Midwest. We source domestically, offer expedited turnaround, and back it all with responsive service you can count on.
While many service centers operate on rigid contracts, we’re different in that we keep inventory on the floor and ready, so when you call, we have the steel you need without the wait. That’s why buyers across industries consider Hascall the trusted expert and the reliable choice for their steel supply.
Hascall provides galvalume coils and sheets for roofing manufacturers, construction firms, and OEMs. We deliver consistent quality, flexible order sizes, and fast processing so builders can keep projects on schedule.
If you need steel, the trusted experts at Hascall Steel are just a phone call away.