To begin with
ZINCALUME, also known by the trade name Galvalume, is a coating applied to the steel before it is painted. This coating consists of a mix of metals, which is why the process is commonly called metallic coating.
The coating is applied by passing the base steel through a molten pot of the metallic coating before it is dried and treated to create a uniform finish.
When it comes to choosing materials for roofing and cladding, Zincalume steel has become one of the most favourite and time-tested options in the construction industry. Known for its enduringness, corrosion resistance, and long-lasting performance, Zincalume has become a go-to choice for both residential and commercial buildings.
In this blog post, we will explore everything you need to know about Zincalume roofing, Zincalume sheet, and its miscellaneous applications, from its price to painting options and much more.
What is Zincalume Steel?
ZINCALUME (Galvalume) uses a metal mix of 55% aluminum and 45% zinc. Aluminum provides an inherent protective barrier compared to zinc, which prevents the spread of corrosion.
As a result, ZINCALUME combines the benefit of preferential corrosion (zinc), while slowing its spread (aluminum). This offers not only longer protection overall but slows corrosion that is caused by scratches or cuts to the surface.
The mix of the two materials was extensively developed in the 1960s and 70s to provide an optimized mix for long-term performance. In recent time, Bluescope Steel is a leading supplier of Zincalume in the worldwide market. It is continuing to innovate in the field of steel products.
The Composition of Zincalume
- Zinc: The zinc coating provides sacrificial protection. It corrodes before the underlying steel, thereby offering corrosion resistance.
- Aluminum: The aluminum component is responsible for providing an excellent barrier to corrosion, improving the material’s longevity.
- Silicon: Silicon is added to improve the adhesion between the steel and the protective coating, ensuring that the material remains durable and weather-resistant.
Applications of Zincalume Steel: Let’s explore the diverse field of Zincalume application
1. Zincalume Roof Sheeting
One of the most popular uses for Zincalume steel is as roof sheeting. Zincalume roof sheeting is known for its excellent weather resistance, energy efficiency, and aesthetic appeal. The reflective surface of Zincalume helps reduce heat absorption, keeping buildings cooler during hot weather, which can lead to significant energy savings over time.
Whether you are installing a new roof or replacing an old one, Zincalume roofing sheets provide excellent value. Handy in different profiles (such as corrugated or ribbed), Zincalume sheets are flexible, durable, and lightweight. They are easy to install and require minimal maintenance, making them an ideal option for both residential and commercial buildings.
2. Flat Zincalume sheets
Apart from roofing, Zincalume sheets are also used in the construction of walls, sheds, fences, and a range of other structural elements. Flat Zincalume sheets are often used for custom applications where specific shapes or dimensions are needed. These sheets can be cut and shaped to meet the exact needs of a project, whether it’s for architectural design elements or more practical applications like gutters, down-pipes, and flashing.
Zincalume AZ150: What Does It Mean?
When selecting Zincalume for a roofing or cladding project, you may come across the term AZ150. This refers to the amount of coating applied to the steel. Specifically, AZ150 indicates that the Zincalume sheet has a coating weight of 150 grams per square meter, meaning that 150 grams of zinc-aluminum coating is applied to each square meter of steel.
This level of coating offers excellent protection against corrosion and is typically used for roofs, walls, and other building materials exposed to the elements. The AZ150 coating is the most commonly used Zincalume specification, providing an ideal balance between cost and corrosion resistance.
If you are building or renovating a structure that will be exposed to harsher conditions, such as coastal areas or industrial sites, you might want to opt for a higher coating specification, like AZ200 or AZ300. Nevertheless, for most standard applications, AZ150 is ample.
Advantages of Zincalume Roofing and Sheeting: Ease over other roof sheeting
1. Durability and Longevity
2. Cost-Effectiveness
3. Energy Efficiency
4. Aesthetic Appeal
5. Lightweight and Easy to Install
Zincalume Roof Sheeting Price
The cost of Zincalume roof sheeting can alter depending on factors such as thickness, coating specification (e.g., AZ150), sheet profile, and supplier. On average, Zincalume roofing materials range from $10 to $20 per square meter. However, prices can fluctuate based on market conditions, location, and quantity purchased.
Painting Zincalume: Can You Paint It?
While Zincalume steel comes with a protective coating that provides excellent resistance to corrosion, some property owners prefer to paint their Zincalume roofs for aesthetic reasons or to further protect the material. Zincalume can be painted, but it requires proper preparation to ensure a long-lasting finish.
Steps to Paint Zincalume
- Clean the Surface: Use a mild detergent and water to clean the Zincalume surface. Make sure to remove any dirt, grease, or other contaminants.
- Apply a Primer: Zincalume’s surface requires a special primer for paint to adhere properly. Use a high-quality primer designed for metal surfaces.
- Apply Paint: Once the primer has dried, you can apply acrylic or other suitable paint designed for metal surfaces.
- Allow to Cure: After painting, ensure the surface is left to cure for the recommended amount of time before subjecting it to weather or foot traffic.
By painting Zincalume, you can not only enhance its appearance but also add another layer of protection against the elements.
Concluding Remarks
Zincalume roofing sheets are an excellent choice for any construction or renovation project. Whether you’re installing a Zincalume metal roof, using Zincalume flat sheets for custom applications, or considering the pricing of Zincalume roof sheeting, it offers great value for money due to its durability, energy efficiency, and corrosion resistance.
Zincalume remains a reliable, versatile, and cost-effective solution for modern building needs. Whether you’re painting Zincalume steel to enhance its look or simply using it for its protective qualities, Zincalume proves to be a wise investment in any building project.
Qingdao witop steel group have the factory which can produce more than 30 roofing shapes and models. They have very good quality and cheaper price than others in the market. We can produce 1000mm to 6000mm long roofing sheet.
We have reliable and stable quality, reasonable price, fast delivery time and 20-years of exporting experiences. Zincalume/ Galvalume roofing sheet have been approved by ISO9001 quality management system and certified by the third party of SGS and BV.
