Galvalume roofing is a modern, high-performance metal roofing material made from a steel core coated with a precise blend of aluminum and zinc. Known for its exceptional corrosion resistance and long lifespan, Galvalume has become a top choice for builders and homeowners across Canada seeking strength, efficiency, and longevity in their metal roof systems. 

It offers superior protection against harsh weather, UV exposure, and moisture, all while maintaining a sleek, contemporary appearance that complements both traditional and modern architectural designs.

Introducing Galvalume: A Modern Roofing Solution

The name Galvalume was trademarked in the 1970s by Bethlehem Steel, and since then, the product has revolutionized the metal roofing industry. Designed to overcome the limitations of traditional galvanized steel, Galvalume’s unique aluminum-zinc alloy coating provides outstanding protection against rust, oxidation, and weathering. It is now widely used for residential and commercial buildings, as well as agricultural and industrial applications.

In Canada, where roofing must endure freeze-thaw cycles, humidity, and snow loads, Galvalume stands out as a low-maintenance material built to handle harsh weather conditions for decades.

The Composition Of Galvalume Roofing

Steel Core: The Foundation Of Strength

At the heart of every Galvalume steel panel is a high-strength steel substrate. This steel core provides the structural integrity needed to handle high winds, snow accumulation, and impact from debris. The steel is typically cold-formed, allowing it to be shaped into durable metal panels for standing seam roofs, corrugated sheets, and custom roofing systems.

Aluminum-Zinc Alloy Coating: The Protective Layer

The steel is then coated with an aluminum-zinc alloy coating, about 55% aluminum, 43.5% zinc, and 1.5% silicon. This combination brings together the rust-resisting properties of aluminum and the galvanic corrosion protection of zinc. The aluminum offers a strong protective barrier, while the zinc provides self-healing properties for small scratches or cut edges.

This Galvalume coating outperforms pure zinc or galvanized coating in most environments, delivering superior corrosion resistance even in coastal or industrial regions with high humidity or ammonia gas exposure.

The Manufacturing Process Of Galvalume

The process of producing Galvalume metal roofs involves several precise steps:

  1. Cleaning and Preparation: The steel substrate is cleaned of oils, oxides, and impurities.
  2. Hot-Dip Coating: The clean steel is passed through a bath of molten aluminum-zinc alloy at roughly 600°C.
  3. Cooling & Solidifying: Once coated, the sheet is cooled to form a smooth, adherent aluminum zinc coating layer.
  4. Acrylic Coating Application: A clear acrylic coating may be added to protect against fingerprints, oxidation, and oil canning during installation.
  5. Forming & Cutting: The finished coils are rolled and cold-formed into metal roofing panels or siding products ready for installation.

This process produces an even, reflective surface that retains its corrosion-resistant properties for decades with minimal maintenance.

Key Benefits Of Galvalume Roofing

Exceptional Corrosion Resistance

The standout benefit of Galvalume roofing is its excellent corrosion resistance. Compared to traditional galvanized steel, it can last two to four times longer before showing signs of rust. The aluminium zinc alloy coating prevents oxidation even on cut edges and flat surfaces, making it one of the most corrosion-resistant materials available in the roofing industry.

Thermal Reflectivity & Energy Efficiency

The bright, reflective surface of unpainted Galvalume helps reflect sunlight, reducing heat absorption. This results in lower cooling costs during Canadian summers and better overall energy efficiency. When used in standing seam metal roofs, it also supports proper ventilation and thermal regulation.

Longevity & Durability

A Galvalume metal roof can last 40 to 60 years, depending on exposure and maintenance. It resists cracking, peeling, and blistering far better than other materials, such as asphalt shingles or wood. Its steel core gives it superior impact strength, while the aluminium-zinc coating protects against degradation caused by harsh weather conditions.

Cost-Effectiveness Over Time

While Galvalume metal roofing may have a higher upfront cost than asphalt or treated lumber, it offers lower lifetime costs due to its low-maintenance material qualities and reduced need for replacement. Fewer repairs, fewer coatings, and long-term structural performance make it a wise investment for both homeowners and commercial buildings.

Applications Of Galvalume Roofing

Residential Uses

Many Canadian homeowners are choosing Galvalume roofs for their aesthetic appeal and performance. It suits a wide range of architectural styles, from modern farmhouses to cottages and urban homes. Beyond curb appeal, its reflective surface helps regulate indoor temperatures, lowering energy bills during hot summers and reducing ice dam formation in winter. The material’s strength also makes it a practical option for regions with heavy snow or high winds, offering peace of mind through every season.

Common applications include:

  • Standing seam metal roofs
  • Metal shingles or tiles
  • Roof systems for garages, workshops, and cottages
  • Soffit and fascia panels
  • Accent roofing for porches, dormers, or awnings

Galvalume’s ability to mimic the look of galvanized metal roofing while offering longer-lasting protection makes it a favourite in residential construction.

Commercial & Industrial Applications

For commercial and industrial buildings, Galvalume steel provides unmatched value and reliability. Its superior corrosion resistance and high strength-to-weight ratio make it suitable for a wide variety of roofing systems.

It is widely used in:

  • Warehouses and cold-formed metal products
  • Manufacturing plants and animal confinement facilities
  • Storage barns and agricultural roofing systems
  • Institutional and retail structures
  • Transportation depots and utility buildings

Its corrosion protection and long service life make it ideal for high-moisture or chemical-heavy environments such as animal enclosures, fertilizer storage, or coastal factories. In these demanding settings, Galvalume’s aluminum-zinc alloy coating maintains integrity even under continuous exposure to ammonia gas and salt-laden air, ensuring dependable, low-maintenance performance for decades.

Galvalume Vs. Other Roofing Materials

When comparing Galvalume vs. galvanized or Galvalume vs. other roofing materials, the differences are clear:

Compared To Galvanized Steel

Both Galvalume and galvanized steel start with a steel core, but their coatings set them apart. Galvanized metal uses a pure zinc coating, while Galvalume combines aluminum and zinc for far better corrosion resistance. In most environments, Galvalume lasts two to four times longer, making it the superior choice for long-term performance.

Compared To Aluminum Roofing

Aluminum roofs are lightweight and corrosion-resistant, but they’re also more expensive and prone to denting. Galvalume roofing delivers similar durability at a lower cost and provides greater strength thanks to its steel substrate. It also handles snow loads and impacts more effectively – a major advantage in Canadian climates.

Compared To Asphalt Shingles

While asphalt shingles remain popular due to their low upfront cost, they have a much shorter lifespan, typically 15 to 25 years, compared to Galvalume’s 40 to 60 years. They also require more maintenance and offer poor energy efficiency. Over time, a Galvalume metal roof proves far more cost-effective and environmentally sustainable.

Compared To Other Metal Roofing Materials

When evaluated against other corrosion-resistant materials, Galvalume metal roofs strike an ideal balance between price, performance, and appearance. They outperform galvanized metal roofing in longevity, match aluminum in reflectivity, and deliver the structural strength homeowners and contractors trust.

Maintenance Requirements For Galvalume Roofs

One of the greatest advantages of Galvalume metal roofing is its low-maintenance nature. However, regular care helps preserve its finish and longevity. Unlike other roofing materials, Galvalume doesn’t require annual painting or sealing, but proactive attention can prevent minor issues from developing over time. After storms or seasonal changes, a quick inspection ensures that fasteners remain tight and that panels are free of debris, dents, or standing water. It’s also wise to trim overhanging branches to prevent abrasion of the Galvalume coating and to keep gutters clean for proper drainage.

  • Clean periodically: Remove debris, leaves, or dirt to prevent water pooling on flat surfaces.
  • Inspect exposed edges: Check for scratches or cut edges that could expose the steel substrate.
  • Avoid direct contact with dissimilar metals: Copper, lead, or iron runoff can cause galvanic corrosion.
  • Prevent contact with concrete or treated wood: Chemicals like copper sulphate and alkalis can degrade the Galvalume coating over time.
  • Recoat if needed: Some installations include a clear acrylic coating to maintain shine and minimize fingerprinting; recoating can extend its life.

With these simple steps, Galvalume metal roofs can maintain their corrosion-resistant finish and structural integrity for several decades, even in Canada’s demanding climates.

Is Galvalume The Right Choice For Your Roofing Project?

If you’re weighing the benefits of Galvalume vs. galvanized or other roofing materials, the choice largely depends on your environment and goals. For Canadian climates with temperature swings, snow, and moisture, Galvalume roofing offers the ideal combination of durability, corrosion resistance, and energy efficiency.

It performs exceptionally well for both residential and commercial buildings, provides modern aesthetics with standing seam metal panels, and delivers excellent long-term value. Combined with proper installation and routine cleaning, it can outperform most metal roofing materials on the market today.

If you’re planning a new roofing project or replacing an old roof, IroSteel offers roofing solutions for lasting protection, modern design options, and the confidence of a roof built to endure Canada’s toughest weather. Just contact our team to learn more about our services and how we can best help you with your unique residential or commercial needs right here in Winnipeg.