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Galvalume Steel Coil & Sheet Metal
Pre-Painted and Acrylic-Coated Aluminum-Zinc Coated Steel
AZ50/AZ55
Galvalume is an aluminum-zinc alloy coated cold-rolled steel ideally suited for metal roofing and metal wall panel applications. Metal Alliance stocks Galvalume AZ50 and AZ55 in 24ga and 26ga coil and flat sheet in a variety of widths. Additional gauges also available upon request. Finishes include acrylic-coated for a natural metal look, and industry-leading protective metal coatings including Tedlar® PVF film, Fluropon® 70% PVDF with Kynar 500®, and WeatherXL™ SMP in over 60 color options.
What is Galvalume?
Developed by Bethlehem Steel in 1972, Galvalume's versatility, ease of use, long-term performance and aesthetic appeal have earned the overwhelming endorsement of architects, metal roofing manufacturers, contractors and building owners all over the world. Offering excellent resistance to corrosion and high heat and a high strength-to-weight ratio, Galvalume panels have a track record of outlasting galvanized sheet in various atmospheres by up to nine times¹.
Using a precise continuous hot-dip coating process, Galvalume is formulated with a 55% aluminum, 43.4% zinc and 1.6% silicone alloy metallic coating that is applied to both sides of carbon steel. Coating weights for architectural applications are 0.50 ounces per square foot (AZ50) for painted applications, and 0.55 ounces per square foot (AZ55) for unpainted. Permanently bonded to the underlying steel, the barrier protection and durability of aluminum, together with the galvanic activity of zinc combine to deliver the optimal performance of both elements, making Galvalume one of the most durable, weather-resistant roofing materials available. And thanks to outstanding formability, its ideal for roll forming into a wide variety of profiles without losing its protective coating.
How Does Galvalume Work?
Both zinc and aluminum have inherent physical and mechanical properties that offer their own forms of corrosion protection.
PROTECTIVE BARRIER: Aluminum is naturally inert and resists corrosion and rust. When applied to steel it is a protective barrier from water and pollutants.
SACRIFICIAL BARRIER: Zinc is more reactive than aluminum. When exposed to the atmosphere it starts to deteriorate, or corrode, sacrificing itself to protect underlying steel.
When combined, reactive properties of zinc and aluminum work together providing underlying steel superior protection compared with uncoated or other alloy-coated steels. Compared to 100% zinc-coated steel (galvanized steel), Galvalume has 2-4 times longer corrosion protection thanks to:
Better Corrosion Resistance When exposed to the environment, the zinc reacts first, forming a thin impermeable layer of oxidized zinc. The corrosive action of zinc extends the time the aluminum layer is left to do its work protecting the underlying steel from attack.
Cut-Edge Protection All metal panel products experience some exposed metal at cut edges or scratches. This can quickly lead to rust of underlying steel because it is no longer protected. However, as zinc begins to corrode in Galvalume, the newly formed oxidized zinc compound will spread to cover cut edges or other areas that become exposed, in effect sealing these areas off from exposure to the environment. Over time, this "self-healing” action results in the corrosion-damaged zinc becoming a barrier layer that is sacrificed in favor of the remaining zinc, leading to prolonged protection of the aluminum and underlying steel.
Metal Roof Color Guide
Fluropon® 70% PVDF Coatings containing
Standard Coatings
Premium Paint Finishes for Beautiful and Long-Lasting Performance
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Best in class performance
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Outstanding color & gloss retention
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High film integrity & adhesion
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Resistance to UV rays, humidity & heat
Premium Coatings
Deluxe Collection
Infinite Collection
Ultra-Premium Coatings
Infinite Collection
* Ultra-Premium coatings are special order and may require minimum quantities.
Going Coastal?
If your project is close to the sea, it will be subjected to extreme conditions. Now when you choose Fluropon 70% PVDF on aluminum, you’re covered against premature chalking, cracking, fading and loss of adhesion, even on the coast. Ask us about the enduring beauty and performance of Fluropon for your coastal projects.
Aluminum Metal Coil & Sheet Metal
Pre-Painted Prime Grade Aluminum
AL/AL
When it comes to metal roofing and metal wall panel systems, Aluminum is a premium choice thanks to its superior corrosion resistance. Metal Alliance offers pre-painted prime grade 3105 and 3003 aluminum coil and flat sheet in the industry's most long-lasting and innovative protective metal coatings including Tedlar® PVF film and Fluropon® 70% PVDF with Kynar 500®.
Known as the lightest metal roofing material available, aluminum is approximately 1/3 the weight of steel, but its strength-to-weight ratio is one of the highest of the common metals (think airplanes). Its light weight combined with resistance to corrosion and high heat make it an ideal material for metal roofing and metal wall panels, especially in coastal environments exposed to regular salt spray. Aluminum is very malleable making it easy to work with when roll forming metal panels and it's 100% recyclable. Aluminum naturally reflects light and emits heat so its also energy efficient.
Metal Alliance prime grade aluminum coil and metal sheet products meet or exceed established ASTM B209 standards.
PARADOXICAL NATURE OF ALUMINUM
Corrosion is the chemical reaction of a material with its environment that leads to the deterioration of its properties. Aluminum , like other metals is no exception, immediately and actively reacting when exposed to oxygen. But aluminum is also a passive metal, exhibiting behavior that seems a bit contradictory.
Active Corrosion vs. Passive Corrosion
Aluminum is chemically reactive, which means it will begin to "corrode" (lose its physical properties) when it interacts with the environment. The corrosion byproduct of aluminum is alumunim oxide, a white chalky substance. But because aluminum has a really strong affinity for oxygen, the aluminum oxide forms very rapidly creating a hard and stable, or "passive" protective layer that effectively seals inner layers of the underlying metal from future deterioration making it ideal for coastal environments and areas exposed to regular salt spray.
ALUMINUM - THE GREEN METAL
Known as the green metal, aluminum is one of the most environmentally friendly metals. It can be infinitely recycled producing second-generation aluminum as strong as its first iteration. In fact, nearly 75% of all aluminum ever produced is still in use today with nearly 40% of the North American supply created through secondary production.
In the architectural building products industry, a properly coated aluminum roof can reflect up to 95% of the sun's rays, keeping the structure underneath cooler and saving on energy costs. Aluminum is also often a key component that may contribute toward earning credits as part of The U.S. Green Building Council's LEED® certified green building program.
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