Whether you are opting for a rigid frame or pre-engineered metal buildings, you need a material that lasts long and keeps maintenance costs low. There are various options available, but Galvalume stands out for many reasons. It’s highly corrosion-resistant, making it suitable for use in harsh weather conditions. If you want to know more about galvalume metal buildings and why they are becoming popular, let’s dig in!
Why Metal Buildings Use Galvalume Structures?
Nowadays, builders are actively using galvalume structures in metal buildings due to their affordability and self-healing properties. Let’s discuss these reasons in detail:
Corrosion Resistant
Since galvalume is actually a zinc-aluminum alloy, it offers incredible corrosion resistance. It typically contains 55% aluminum, 43.4% zinc, and 1.6% silicon, which protect the steel from rust or damage.
The aluminum in its composition forms a tough and long-lasting oxide layer that acts as a physical barrier against moisture and corrosion. Even if the film gets damaged, it regenerates quickly (self-healing mechanism).
In addition, the zinc provides galvanic or sacrificial protection. Whenever the coating is cut or scratched, the zinc preferentially corrodes due to an electrochemical reaction, while the underlying steel remains protected from oxidation. Combined, these elements stop the formation of red rust on the exposed edge, ensuring the metal building material remains structurally sound.
Long Lifespan
Another reason galvalume structures are pretty common in metal buildings is their long lifespan. The self-healing and corrosion-resistant properties help galvalume last two to four times longer than traditional galvanized steel. Once installed, they can perform well for at least 40 to 70 years, depending on environmental conditions, installation quality, and overall maintenance.
Sustainability
The world is facing increased waste and global warming, and the construction sector is among the major contributors to this. Statistics show that the construction sector globally could generate around 2.2 billion tonnes of construction and demolition waste in 2025. Unfortunately, only 40% of this waste is recycled or reused, requiring swift policies on the use of green and recyclable materials.
In such situations, Galvalume metal buildings truly win the hearts of eco-conscious consumers. That’s because galvalume is 100% recyclable and even made from recycled steel, which significantly lowers the need for raw materials. This ensures that your space aligns with global green practices, reducing your overall carbon footprint.
Cost-Effectiveness
While many people think galvalume is expensive, it actually offers long-term financial benefits that offset the initial cost. It’s very durable, so once you’ve set up the galvalume metal buildings, there’s no need for frequent component replacement. But that’s not all; Galvalume also offers high solar reflectivity.
This means its heat absorption is significantly lower than that of other materials, reducing your cooling costs and overall energy bills. The best part is that it requires very little maintenance. Even with occasional cleaning and inspections, the material retains its appearance over time.
Versatility
The popularity of galvalume is also due to its highly versatile nature. It’s available in coils and sheets that you can customize according to your specific applications. For instance, it can be rolled-formed into panels and corrugated sheets, as well as structural framing, and offers a blend of strength, durability, workability, and aesthetic options.
Types of Galvalume Steel Used in Metal Buildings
Now that you are aware of the major reasons why metal buildings use galvalume, let’s discuss its different types so you can choose the right one for your applications:
AZ50
The galvalume AZ50 is a cold-rolled steel sheet coated with an aluminum-zinc alloy. In this, 50 refers to the coating weight, which is around 0.50 ounces per square foot on both sides. You’ll commonly see it in the structural elements of metal buildings, household appliances, or ventilation ducts.
AZ60
The AZ60, as its name suggests, has a density of 60 grams per square meter (approximately 0.6 ounces per square foot) on both sides. It can withstand temperatures exceeding 300°C and is commonly used for wall panels, metal roofing, and other construction applications.
AZ70
Compared to AZ50 and AZ60, galvalume metal buildings with AZ70 can better withstand harsh, corrosive environments. The AZ indicates the aluminum-zinc coating, while the 70 indicates that the coating weight is approximately 70 grams per square meter. This material for metal buildings has good heat resistance and thermal reflectivity. Therefore, you can use them in versatile scenarios such as roofing, siding, and cladding panels.
Besides these grades, you’ll find two types of galvalume metal building materials: bare and pre-painted. The bare or unpainted galvalume has a natural metallic, spangle finish. Commercial metal buildings, such as warehouses and industrial spaces, where appearance isn’t a major concern, can use this type.
Pre-painted, on the other hand, includes a color coating that enhances the aesthetics and durability of the galvalume. You should choose this material when you are completing a residential or business metal building project where you need specific colors.
Applications of Galvalume in Metal Building Construction
Within the construction sector, as well as in metal buildings, Galvalume is used for various structures. Here are some common ones:
- Roofing Systems: Galvalume is widely used for metal roofing because of its exceptional resistance to rust and heat. It survives well in harsh conditions, saving you from the hassle of frequent roof repairs and replacements.
- Wall Cladding: Exterior wall panels made from galvalume offer long-term protection against moisture and temperature changes. That’s why businesses prefer them for factories, storage facilities, and workshops where a specific environment is necessary.
- Carports and Canopies: Sometimes galvalume sheets are used for open or semi-enclosed structures like carports and covered walkways. They remain strong over time, providing protection to people from all environmental challenges, including heat and rain.
How to Select the Right Grade for Galvalume Metal Buildings?
Choosing the right galvalume metal building grade is quite important as it directly affects durability, performance, and life cycle cost. The following factors help you in decision-making:
Carefully Understand the Application Environment
Before you select a specific galvalume grade for the metal building, you should analyze the application environment. Is the area highly corrosive? Perhaps it experiences high heat every day? Based on the answers, you can choose any of the following:
- Mild Climate: AZ50 or AZ55
- High Humidity and Rainfall: AZ60 or AZ70 is recommended
- Coastal or Industrial Zones: AZ150, as it has incredible thermal reflectivity and can withstand corrosion attacks easily
Consider Maintenance Requirements
If you are looking for something that’s durable and requires minimal upkeep, you should go for higher grades. They have more aluminum-zinc coating on each side, which enhances their lifespan. With these simple maintenance tips, you can keep the galvalume in good condition:
- Clean the surface using a mild detergent solution in water. Rub it using a soft sponge to avoid scratches.
- Always rinse the surface with freshwater after cleaning to remove all soapy residue.
- Regularly inspect for damage and reapply paints or coats wherever necessary. Also, remove environmental contaminants like pollens and bird droppings to ensure the galvalume is pristine.
Comply with Regulations
When you choose to work with or install galvalume metal buildings, you must first look at the local guidelines and regulations. Check if there are any sustainability or grade requirements you must meet before starting the project.
If all this feels like a hassle, you can partner with reputable, certified suppliers or manufacturers who can guide you based on their previous projects in a similar area. This makes sure you don’t fall victim to heavy fines or penalties.
Balance Budget with Functionality
While it’s tempting to opt for the highest galvalume grade, we suggest balancing budget with functionality. If your project is in moderate condition, a lower, more affordable grade can do the work. Only use high-grade materials for industrial buildings that face challenging conditions.
However, when investing in galvalume metal buildings, you should be aware of the common myths and misconceptions surrounding this material. People think that galvalume is noisy, but when installed over a solid sheathing and with proper insulation, the noise is significantly less than that of other alternatives.
In addition, there are speculations that galvalume attracts lightning, which isn’t true. Light is often drawn to the highest point in an area rather than to a specific material.
Conclusion
Galvalume Metal buildings are truly a treat for people who want a good return on their investment. Wondering where you can get top-notch galvalume structures or steel? Get in touch with Zhaojian Steel today! We have years of experience serving customers in different areas and offer certified products that truly meet and exceed expectations.
