What is Zincalume Roofing? (And How is it Different from Traditional Roofing)

If you’re looking for a new roof, you might have heard of Zincalume. But what is it? And how is it different from traditional roofing?

Zincalume is a type of roofing material that has been used in Australia since the 1970s. It has become increasingly popular as of late due to its durability and longevity, but it has also been criticized for being too expensive.

In this article, we’re going to explore what Zincalume roofing is, how it compares to traditional roofing materials, and whether or not it’s worth the investment.

What is Zincalume roofing?

Zincalume roofing is a type of steel roofing that is coated with a blend of zinc, aluminum, and silicon.

This coating provides excellent corrosion resistance and helps to increase the lifespan of the roofing material.

Zincalume roofing is often used in industrial and commercial buildings, as well as residential homes.

It is known for its durability, strength, and resistance to extreme weather conditions, such as heavy rain, strong winds, and snow.

It is also lightweight and easy to install, making it a popular choice for many builders and homeowners.

How is Zincalume roofing different from traditional roofing?


Zincalume roofing is made from steel that is coated with a mixture of zinc, aluminum, and silicon. Traditional roofing materials may include asphalt shingles, clay or concrete tiles, wood shingles or shakes, or metal roofing that is not coated with zinc.


Zincalume roofing is highly durable and resistant to corrosion, making it a long-lasting choice for roofing. Traditional roofing materials may not have the same level of durability and may require more maintenance over time.


Zincalume roofing is lightweight compared to traditional roofing materials like clay or concrete tiles, which can be heavy and require additional structural support.

Weather resistance

Zincalume roofing is known for its excellent resistance to extreme weather conditions, such as heavy rain, strong winds, and snow. Traditional roofing materials may not have the same level of resistance, especially over time as they age and degrade.


Zincalume roofing is relatively easy to install, making it a popular choice for builders and homeowners. Traditional roofing materials may require more complex installation methods and may take longer to install.

What are the benefits of using Zincalume roofing?

  • Longer lifespan: Zincalume roofing has a longer lifespan compared to other roofing materials, which means it may need to be replaced less frequently.
  • Better corrosion resistance: Zincalume roofing is highly resistant to corrosion, which helps to extend its lifespan and reduces the need for maintenance.
  • Better heat reflectivity: Zincalume roofing has high heat reflectivity, which helps to reduce energy costs by keeping buildings cooler and reducing the need for air conditioning.
  • More color and texture options: Zincalume roofing is available in a variety of colors and textures, which allows for greater customization and aesthetic appeal.
  • Reduced noise: Zincalume roofing can help to reduce noise levels inside buildings, which can be especially beneficial in industrial or commercial settings.
  • Improved energy efficiency: Zincalume roofing can help to improve energy efficiency by reducing heat gain in the summer and heat loss in the winter, which can help to lower heating and cooling costs.
  • Lower long-term costs: Although Zincalume roofing may have a higher upfront cost compared to other roofing materials, its longer lifespan and reduced maintenance needs can result in lower long-term costs.
  • Better durability: Zincalume roofing is highly durable and resistant to damage from weather, pests, and other factors, which helps to extend its lifespan and reduce the need for repairs.
  • Improved safety: Zincalume roofing is fire-resistant, which can help to improve safety in buildings and reduce the risk of fire damage.

What makes Zincalume roofs better than zinc roofs?

Zinc roofs are made of pure zinc and are highly resistant to corrosion. They have a distinctive matte appearance and are relatively lightweight.

Zinc roofs are also known for their longevity and durability, with some lasting up to 100 years or more.

Zincalume roofs, on the other hand, are made of a combination of zinc, aluminum, and silicon, creating a galvanized steel material that is highly resistant to corrosion and rust.

Zincalume roofs are also lightweight and offer excellent thermal efficiency, which helps to reduce energy costs. They are also highly durable and can last for many years with minimal maintenance.

Compared to Zinc roofs, Zincalume roofs have superior resistance to corrosion and better thermal efficiency.

Zincalume also has a smooth, shiny appearance and can be painted to match any design preference.

Also, Zincalume roofs tend to be more affordable than pure zinc roofs.

Is Zincalume Roofing corrosion resistant?

Zincalume roofing is highly corrosion-resistant. It is made from steel that is coated with a blend of zinc, aluminum, and silicon, which creates a barrier that protects the underlying steel from corrosion.

This coating is applied using a process called “hot-dipgalvanization,”, which involves dipping the steel into a bath of molten zinc to create a bond between the zinc and steel.

The zinc coating on Zincalume roofing serves as a sacrificial anode, which means that if the coating is scratched or damaged, the zinc will corrode instead of the underlying steel. This helps to protect the steel and extend the lifespan of the roofing material.

Zincalume roofing has been extensively tested for corrosion resistance in a variety of environments, including coastal areas with high salt content in the air.

It has been found to be highly resistant to corrosion in these environments, and it is often recommended for use in areas with harsh weather conditions.

How durable is Zincalume roofing?

  • Corrosion resistance: Zincalume roofing is highly resistant to corrosion, which helps to prevent rust and other forms of degradation that can weaken the material over time.
  • Toughness: Zincalume roofing is designed to be tough and resilient, which helps to resist damage from impacts such as hailstones or falling debris.
  • Weather resistance: Zincalume roofing is designed to withstand a wide range of weather conditions, including high winds, heavy rain, and snow.
  • UV resistance: Zincalume roofing is resistant to UV radiation, which can cause other roofing materials to degrade over time.
  • Longevity: Zincalume roofing has a long lifespan and is designed to last for many years without requiring extensive maintenance or repairs.

What type of warranty does Zincalume Roofing have?

Zincalume roofing typically comes with a warranty that covers defects in material or workmanship, as well as corrosion resistance.

For example, Bluescope Steel, one of the largest manufacturers of Zincalume roofing, offers a warranty on their products called the “Zincalume and ColorBOND Warranty”.

This warranty covers the steel substrate against corrosion for up to 36 years from the date of installation in certain environments. It also covers the paint system for up to 20 years against flaking, peeling, or cracking.

Other manufacturers may offer different warranties, so it’s important to check with the specific manufacturer or supplier of the Zincalume roofing product for details on their warranty coverage.

It’s worth noting that in order to qualify for warranty coverage, Zincalume roofing must be installed correctly and in accordance with the manufacturer’s specifications.

This may include using specific accessories, fasteners, and installation techniques, so it’s important to follow the manufacturer’s instructions carefully.

What is the SRI value of Zincalume roofing?

The Solar Reflectance Index (SRI) is a measure of a material’s ability to reflect solar heat and reduce heat buildup in the building below. The SRI value ranges from 0 to 100, with higher values indicating greater reflectivity and heat reduction.

The SRI value of Zincalume roofing can vary depending on the specific product and color. However, in general, zinc roofing has a relatively high SRI value compared to many other roofing materials.

According to Bluescope Steel, Zincalume roofing has an SRI value of up to 69 but averages around 57 depending on the color.

This high SRI value makes Zincalume roofing an effective choice for reducing the heat island effect in urban areas and improving energy efficiency in buildings. By reflecting more solar heat, Zincalume roofing can help reduce the amount of energy needed to cool the building below, which can result in lower energy bills and a reduced environmental impact.

What type of maintenance is required for Zincalume roofing?

  • Clean the roof: Over time, dirt, debris, and other pollutants can accumulate on the roof, which can reduce its reflectivity and compromise its performance. To prevent this, it’s recommended to clean the roof periodically using a gentle cleaning solution and a soft-bristled brush. Avoid using abrasive cleaning tools or harsh chemicals that can damage the surface of the roof.
  • Inspect the roof: Regular inspections can help identify any potential issues with the roof, such as damage to the surface, leaks, or other signs of wear and tear. Inspect the roof at least once a year and after any major weather events to check for any signs of damage or deterioration.
  • Check for damage: If you notice any signs of damage, such as dents, scratches, or corrosion, it’s important to address them promptly to prevent further damage. Small scratches or chips can be repaired using touch-up paint or sealant, while larger damage may require professional repair or replacement.
  • Trim nearby trees: Trees and other vegetation can drop leaves, branches, and other debris onto the roof, which can cause damage or reduce its performance. To prevent this, it’s recommended to trim any trees or vegetation that are growing near the roof and remove any debris that accumulates on the roof.

How do you install Zincalume roofing?

  1. Prepare the roof deck: Before installing the Zincalume roofing, the roof deck should be clean, dry, and free of any debris or protrusions that could interfere with the installation. If necessary, the roof deck may need to be repaired or reinforced to ensure it can support the weight of the new roofing.
  2. Install the underlayment: Depending on the specific product and installation method, an underlayment may be installed over the roof deck to provide a smooth surface for the roofing. The underlayment may also help provide additional protection against moisture and wind.
  3. Install the Zincalume roofing panels: The Zincalume roofing panels are typically installed starting at the eaves and working up toward the ridge. The panels are fastened to the roof deck using screws or other fasteners that are designed to be compatible with the Zincalume material. It’s important to follow the manufacturer’s instructions carefully to ensure that the panels are installed correctly and securely.
  4. Finish the roof edges: Once the roofing panels are installed, the edges of the roof may need to be finished with flashing, trim, or other materials to provide a clean, watertight seal. The finishing materials should be compatible with the Zincalume material and installed according to the manufacturer’s instructions.
  5. Inspect the installation: After the Zincalume roofing is installed, it’s important to inspect the roof carefully to ensure that it is installed correctly and there are no leaks or other issues. Any issues should be addressed promptly to prevent damage to the roof or the building below.

What colors are available with Zincalume Roofing?

  • Classic metallic finishes: Zincalume roofing is available in its classic metallic finish, which is a light silver-gray color that can complement a range of architectural styles.
  • Colorbond colors: Zincalume roofing is often coated with Colorbond technology, which allows it to be painted in a range of colors. Some common Colorbond colors for Zincalume roofing include Deep Ocean, Monument, Surfmist, Shale Grey, and Jasper.
  • Custom colors: Depending on the manufacturer, Zincalume roofing may be available in custom colors to match specific design requirements or to create a unique look.

Is Zincalume better than galvanized roofing?

When comparing Zincalume and galvanized roofing, both options have their own unique advantages and disadvantages.

The choice between the two will depend on the specific needs and requirements of the project.

Zincalume roofing is more corrosion-resistant than galvanized roofing due to its higher proportion of aluminum to zinc.

This means that it is less likely to rust or corrode, even in harsh environments.

Also, Zincalume roofing has a higher heat reflectivity than galvanized roofing, which can help reduce cooling costs in warm climates.

It also has a longer lifespan than galvanized roofing, which can help reduce long-term maintenance and replacement costs.

However, Zincalume roofing is generally more expensive than galvanized roofing due to its higher aluminum content.

In terms of aesthetics, Zincalume roofing has a more modern, sleek appearance than galvanized roofing, which may be preferable for some architectural styles.

Is Zincalume rust-proof?

Zincalume roofing is not entirely rust-proof, but it is highly corrosion-resistant.

Zincalume roofing is made up of a steel base with a thin layer of aluminum and zinc coating applied to it.

This coating provides a barrier against corrosion, and the aluminum in the coating helps to protect the steel base from rust.

The combination of aluminum and zinc creates a self-healing property that can help prevent rust from spreading if the surface is scratched or damaged.

What is Zincalume made of?

Zincalume is a type of roofing material that is made of a steel base coated with a mixture of aluminum and zinc.

The steel base is typically made of high-tensile steel, which is a strong and durable material that can withstand the weight of the roof and the elements.

The aluminum and zinc coating is applied to the steel base using a hot-dipping process, where the steel is dipped into a bath of molten aluminum and zinc.

This process creates a thin layer of aluminum and zinc alloy on the surface of the steel, which provides protection against corrosion and improves the longevity of the roofing material.

The exact composition of the aluminum and zinc coating can vary, but typically it consists of around 55% aluminum, 43.5% zinc, and 1.5% silicon.

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Author: Logan

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