Coastalume
TM
New!
Breakthrough Steel Protection at the Coast!
Coastalume Steel Coil & Sheet Metal
Coastal Grade Aluminum-Zinc Coated Galvalume®
AZ60 with Tedlar® PVF Film
Coastalume was engineered to deliver long-term durability specifically for residential and commercial construction in coastal environments. By combining the proven corrosion resistance of AZ60 Galvalume steel with the advanced barrier protection of Tedlar PVF film, Coastalume offers unmatched performance for projects near breaking surf or large bays, and brackish water sources like marshes and intercoastal waterways. This maintenance-free, and highly sustainable roofing and siding solution offers a revolutionary level of warranty protection up to 300’ from breaking surf and large bays, and no setbacks from intercoastal waterways or brackish water sources, so you can build confidently with steel on the coast.
ADVANTAGES OF COASTALUME:
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North America’s first GALVALUME® product designed
for demanding coastal environments -
Outstanding resistance to saltwater, humidity, UV exposure,
mold, mildew, chalking, and abrasion -
High strength-to-weight ratio
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Excellent formability with cut-edge protection and self-healing properties
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Warranty coverage extending up to 300 feet from breaking surf
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No setbacks from brackish water sources like marshes and intercoastal waterways
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Maintenance-free - No fresh water rinse required for finish warranty
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Offered in a curated collection of crisp and earthy colors
Coastalume Quick Reference
†For limited warranty information, including detailed coverage and exclusions, contact a Metal Alliance representative. Coastalume™ is a registered trademark of United States Steel Corporation. Galvalume® is a registered trademark of BIEC International Inc. Tedlar® is a registered trademark of DuPont de Nemours, Inc.
What is Coastalume?
A breakthrough in coastal durability, COASTALUME™ coated steel combines cutting-edge materials with unmatched performance and lasting protection. At its core is AZ60 Galvalume® steel. Long prized for its proven corrosion protection, strength, and long service life, Galvalume is formulated with a 55% aluminum, 43.4% zinc and 1.6% silicon alloy metallic coating that is applied to both sides of carbon steel. AZ60, specifically engineered for hostile or aggressive environments like marine settings, has a thick coating weight of 0.60 ounces per square foot.
The Galvalume substrate is finished with Tedlar PVF film, a high-performance barrier that seals the metal from salt, moisture, UV light, and airborne pollutants to produce Coastalume. This powerful combination was developed specifically for buildings near the ocean and bay shorelines, where traditional finishes and coatings degrade more quickly. The result is a product that delivers a longer service life, reduced maintenance needs, and a consistently attractive appearance.
GALVALUME AZ60
Formulated with a thicker aluminum-zinc coating weight of 0.60 oz. per sq. ft, AZ60 is specifically engineered to perform better in demanding coastal environments.
THE NEXT WAVE IN
COASTAL CONSTRUCTION
Tedlar® is a non-PFAS alternative to traditional paint coatings giving COASTALUME™ coated steel its unmatched edge. When combined with thick 0.60 oz. coated Galvalume, Coastalume offers a revolutionary, maintenance-free, and highly sustainable roofing and siding solution built to endure the harshest seaside conditions.
How Does Coastalume Excel in Coastal Environments?
Proven Strength and Corrosion Resistance
What sets GALVALUME® AZ60 (Al-Zn) apart is how its aluminum and zinc layer work in tandem to shield steel against corrosion, and how that protection is amplified by the heavier AZ60 coating weight. This dual-metal system provides both a lasting surface barrier and a sacrificial layer that defends vulnerable areas, ensuring long-term durability even in salt-laden, high-humidity environments.
Barrier Defense
The aluminum in Al-Zn alloy acts as a barrier, forming a tough, passive oxide layer that prevents oxygen, and corrosive elements like salt from penetrating to the steel beneath. Because aluminum oxides are stable and tightly bonded, they significantly slow down surface corrosion and help the coating retain its integrity over time.
Sacrificial Action
Zinc is more reactive than steel, so when the coating is scratched, cut, or otherwise breached, the zinc preferentially corrodes instead of the exposed steel. This sacrificial action protects vulnerable areas such as edges, fastener holes, or abrasions, delaying rust from forming at those sites.
Amplified Corrosion Defense
When the Al-Zn coating weight is increased to 0.60 ounces per square foot, it supercharges corrosion resistance. A boost in aluminum slows down the surface corrosion rate significantly, especially in environments with continuous salt exposure and humidity, while added zinc creates a longer-lasting sacrificial shield at vulnerable cut edges and fasteners—delaying breakdown and extending performance well beyond standard coatings.
Cut-Edge Protection of AZ60 Galvalume
Coastalume’s AZ60 core offers advanced longer-lasting self-healing cut-edge protection to resist rust and corrosion over time – delaying coating breakdown and extending performance.
Superior Protection in Harsh Environments
Providing a final, durable shield, TEDLAR® PVF Film adds an extra surface layer of defense that directly addresses the challenges of harsh coastal conditions. The film's steady chemical, physical, and thermal properties make it ideal for preventing salt spray, pollutants, and moisture from ever reaching the steel substrate, keeping the underlying AZ60 coating in reserve.
Seamless Surface Protection
Unlike painted coatings, Tedlar is a continuous fluoropolymer film that bonds tightly to the Galvalume substrate. The 100% PVF film is applied uniformly so there are no weak spots that could flake or chip. And because the film is highly flexible it won't chip or crack from thermal expansion, high winds or installation stresses.
Long-Term Color & Corrosion Defense
The chemical stability of Tedlar ensures colors won't chalk or fade even after decades of UV ray, salt, and humidity exposure. Its inert surface won't react with salt, pollutants, or organic matter, further protecting the steel beneath from corrosion and surface damage.
Clean, Low-Maintenance Performance
Tedlar's non-porous fluoropolymer surface keeps panels looking fresh by naturally resisting staining, mold, and mildew-even in humid salt-air environments where organic growth thrives. Its low surface energy prevents dirt, pollutants, and biological matter from sticking, so the surface stays vibrant and clean with minimal maintenance, extending beauty and performance far beyond painted finishes.
After 2000 Hours of Salt Spray Exposure
Tedlar PVF Film
PVDF
Tedlar PVF film bonds tightly with the AZ60 substrate and acts as a shield to protect Coastalume from corrosive elements like salt spray and humidity from penetrating the surface.