Galvalume Metal Roofing: Applications, Pros, and Cons

May. 27, 2024

Galvalume Metal Roofing: Applications, Pros, and Cons

Galvalume is a term that tends to confuse many who aren't well-versed in roofing terminologies. It is a type of metal that is in high demand because of its functionality and several benefits. However, people sometimes confuse Galvalume metal with galvanized steel.

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Before you choose a metal roof for your building, it is essential to understand what makes each metal stand out, including Galvalume and its drawbacks. Knowing their properties and differences will help determine which suits your project better.

In this article, we'll clear any confusion by describing Galvalume and discussing its applications, limitations, and benefits.

What Is Galvalume Metal?

Galvalume is a kind of steel metal invented in the 1970s. It comprises steel, zinc, and aluminum, three of the most relevant metals in the roofing industry. Manufacturers produce it at a high temperature of 600°C by hot-dipping a carbon steel base sheet continuously with zinc and aluminum alloy until it is 55% aluminum, 43.4% zinc, 1.6% silicone, and some trace elements. The combination of aluminum’s increased durability and protection and zinc’s electrochemical protection makes this metal a popular choice.

Applications of Galvalume Metal

Generally, you can use Galvalume for roofs, trims, walls, and other applications. However, one of its most prevalent applications is outdoor metal paneling and roofing due to its high corrosion resistance. It is commonly used in the following:

Home appliances: Galvalume is used in home appliances such as air conditioners, solar water heaters, and refrigerator back panels.
Automobile industry: In the automobile industry, manufacturers employ Galvalume metal to make exhaust pipes, fuel tanks, mufflers, car body panels, and other parts.
Construction industry: This steel type is used for roofing panels, fence panels, door panels, partition walls, garage doors, and chimneys.
Industrial uses: Some industrial uses include electric control cabinets, vending machines, and industrial freezers.

Despite its high demand, there are some cases where Galvalume is not suitable for use because the coating may disintegrate early, causing a system failure. Some such cases include:

Coastal environments: Galvalume’s coating can't withstand coastal conditions. When sodium chloride (salt) comes into contact with Galvalume in large amounts, it destroys its coating and disintegrates the wall or roof system, shortening its lifespan. Experts recommend using an engineered aluminum roof system in coastal areas as it can withstand saltwater for a much longer period without corroding.
Animal sheds/shelters: Using Galvalume metal on animal shelters is not advisable. When animals pass out waste, the waste disintegrates into ammonia gas, which reacts with the Galvalume coating, causing it to break down and the metal to degrade.

Although experts do not recommend this metal type for buildings housing animals, some farmers use it on contemporary chicken shelters built with a vapor barrier. The barrier is usually between the roof and the chicken area for sufficient ventilation.

Advantages of Galvalume Metal

Superior corrosion resistance: Galvalume’s resistance to corrosion is two to four times that of galvanized steel due to the combined protection qualities of zinc and aluminum. When zinc fades, the aluminum creates a thick oxide layer that contains further corrosion of the base metal. Research indicates that Galvalume metal roofing can last up to 50 years or more without corroding.
Aesthetically pleasing: Galvalume has a silver-white color with a smooth surface that gives it visual appeal. Unlike galvanized steel, it has more uniform spangles, making it a preferred choice for many buildings.
Warranty on substrate: Galvalume offers a 25.5-year substrate warranty, often referred to as the perforation warranty. This, combined with paint warranties, protects your investment and extends its lifespan.
Heat resistance and reflectivity: This steel type has good heat resistance and can endure temperatures as high as 315°C for a significant period without losing its color. It also has double the heat reflectivity of galvanized steel, making it ideal for roofing.
Good adhesion: Galvalume doesn’t need weathering or pretreatment before painting. Its good adhesion makes it a common choice for color-coated steel as the base metal.

Disadvantages of Galvalume Metal

High cost: Galvalume is more expensive than galvanized steel due to the use of high-quality materials and the technical coating process. This makes it less suitable for property owners on a budget.
Weak protection against acidic environments: Although Galvalume does well in most conditions, it has a low tolerance for acidic ones. Exposure to compounds like industrial emissions or acidic rain accelerates corrosion, causing the coating to wear off quickly.
Lack of color variety: While some people find Galvalume metal aesthetically pleasing, its limited color variety is a drawback compared to roofing materials like clay tiles and asphalt shingles.
Fast deterioration: When one point on a Galvalume steel roof corrodes, it quickly spreads to other parts until the entire roof is affected. This is not the case for galvanized roofs, where corrosion does not spread as rapidly.

Conclusion

Galvalume steel metal is quite popular in the roofing industry, offering several benefits, including high resistance to corrosion, warranty, and good adhesion. However, like other metals, it has its downsides. Your priorities, budget, and environment will determine if this metal type is a good choice for you. We also suggest seeking guidance from a professional roofing contractor.

Frequently Asked Questions

What is the difference between Galvalume and galvanized metal?

The significant difference is the coating composition. Galvalume has an aluminum-zinc alloy that consists of 43.4% zinc, 55% aluminum, and 1.6% silicone, whereas galvanized steel has a zinc coating.

What does Galvalume look like?

Galvalume is silver-white with a matte appearance. It has consistent spangles but is not as lustrous as galvanized steel. Many people use it without painting.

Is Galvalume more expensive than galvanized steel?

Yes, it is more expensive, but not by much. Factors like the aluminum-zinc alloy, manufacturing process, and coating thickness contribute to Galvalume's higher cost.

Can you paint Galvalume metal?

Absolutely! It has good adhesion, making it easy to paint. Although many use it in its natural state, some paint it to match their desired aesthetics. So, yes, you can paint it any color you want.

Is Galvalume metal a good roofing material?

It is undoubtedly an excellent roofing material and a popular choice among property owners. It offers several benefits, including high resistance to corrosion, high heat resistance, good adhesion, and a pleasing appearance.

Is Galvalume stronger than aluminum?

Yes, it is stronger than aluminum. Aluminum is a naturally soft metal and can't withstand harsh weather conditions like high winds and storms. Aside from being stronger, Galvalume is also more economical.

Choosing Your Metal Roof: Aluminum, Steel, or Galvalume?

Are you at a crossroads trying to pick the right metal for your roof? Choosing between aluminum, steel, and Galvalume isn't just a matter of taste. It's about finding the perfect match for your home's needs. It's a big investment, one that you want to get right. We get it.

In the world of metal roofing choices, each material stands out with unique benefits and considerations. Whether you're leaning toward the lightweight durability of aluminum, the classic strength of steel, or the rust-resistant qualities of Galvalume, making a well-informed decision is crucial for your home's shelter and style. At RoofCrafters, we've been helping families choose the best metal roofs for three decades, and we're here to help you too!

In this article, we'll explore the differences between aluminum, steel, and Galvalume, and discuss the pros and cons of each material. We'll also cover the different applications for each type of metal.

By the end of this article, you'll have a better understanding of aluminum, steel, and Galvalume. Hopefully, you'll be well-informed enough to make the best decision for your upcoming roof replacement.

Let's jump right in!

What is Aluminum Roofing?

Aluminum is a lightweight and corrosion-resistant metal often used in construction (windows, doors, siding, roofing) and manufacturing (beer and coke cans!). It's a popular choice for metal roofing because of its durability and resistance to rust and corrosion, making it a great option for coastal areas.

Aluminum is best used in situations where weight is a concern, such as on lightweight or low-sloped roofs. It's also a top choice for coastal areas due to its resistance to salt corrosion. Additionally, because aluminum is a soft metal, it can be easily formed and shaped into various styles and designs.

Why Choose Aluminum for Your Roof?

RoofCrafters recommends aluminum to homeowners looking for a durable and long-lasting metal. It's the best option for homeowners who want a painted metal roof and live in areas prone to salt corrosion. It's more affordable compared to other metal materials, such as copper, lead, or zinc. Plus, aluminum is available in a variety of styles and colors, so it can complement any home's design.

Now let's cover the pros, cons, and cost:

Pros:

Lightweight: Aluminum is one of the lightest metals used in roofing, making it suitable for homes that can't support heavier materials.
Corrosion-resistant: Aluminum is resistant to corrosion and rust, ideal for coastal areas or regions with high humidity.
Fire-resistant: Aluminum has a high melting point and does not burn, which means it can withstand high temperatures without catching fire.
Energy efficiency: Aluminum has high reflectivity, reflecting the sun's rays instead of absorbing them, helping to keep your home cooler in the summer and reduce energy bills.
Color options: Aluminum metal roofing offers many color options compared to other types of roofing.
Long-lasting: Aluminum roofing can last up to 50+ years with minimal maintenance.
Low maintenance: Compared to other roofing materials, aluminum requires minimal maintenance over its lifespan, saving you time and money in the long run.

Cons:

More Expensive: Aluminum is more expensive than other roofing materials like steel, Galvalume, and asphalt shingles.
Soft: Aluminum is a softer metal, making it more susceptible to denting from hail or falling tree limbs.
Noisy: The softness of aluminum can make it louder during rain or hailstorms compared to other roofing materials.

Cost:

The exact cost will depend on several factors, including the size and complexity of your roof, your location, and the cost of labor in your area.

On average, you can expect to pay between $13 and $19 per square foot for an aluminum standing seam roof. That's $39,000 to $57,000 for a home that is around 3,000 square feet.

What is Steel Roofing?

Steel is an incredibly strong and durable metal that has been used in construction for centuries. Steel roofing is a popular choice among homeowners due to its strength, resistance to the elements, and longevity. It's commonly used in commercial buildings, industrial facilities, and residential homes.

Steel is best used in situations where durability and strength are important. It's an excellent choice for areas that experience extreme weather conditions, such as high winds, heavy rain, and hail. Steel roofing is also ideal for homes with flat or low-sloped roofs, as it doesn't crack or break under pressure.

Steel Roofing: Is It Right for You?

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We'd recommend steel for homeowners who want a cost-effective and low-maintenance roof. Steel roofing is only available painted. Like a car, it will rust without a paint finish. The good news is it's available in a wide variety of styles and colors. Also, you'll need to live at least 10 feet away from the ocean. That's about a 10-minute walk in case you're like me and don't get the feet thing!

Let's cover the pros, cons, and costs:

Pros:

Durability: Steel roofing is strong, incredibly durable, and can withstand harsh weather conditions, including high winds, heavy rain, and hail.
Longevity: With proper installation and maintenance, steel roofing can last up to 50+ years.
Range of gauges: Steel is available in a range of gauges, including 22, 24, 26, and 29 gauges, allowing for greater flexibility in choosing the appropriate thickness for your home. (24 & 26 gauge are the most popular)
Fire-resistant: Steel roofing is fire-resistant, providing more safety and protection for your home.
Color options: Steel comes in a wide range of colors and styles. You can easily find a design that complements the look of your home. Additionally, steel is often coated with a reflective finish that can help reduce energy costs by reflecting sunlight and keeping your home cooler in the summer months.
Low maintenance: Steel roofing requires minimal maintenance and can be easily cleaned with a pressure washer or by hand.

Cons:

More expensive: Steel is more expensive than traditional roofing materials like asphalt shingles and can be prone to price fluctuations based on market conditions.
Heavy: Steel roofing is heavier than other roofing materials, which can increase labor costs because it's slower and more difficult to install.
Susceptible to rust: If steel roofing isn't properly coated (paint), it can be susceptible to rust and corrosion over time.
Scratching and denting: Steel roofing can scratch and dent from hail, tree branches, or other debris. If this occurs, it will rust, so scratches will need paint.

Cost:

The cost of steel varies depending on many factors, including the square footage of your roof, the thickness of steel you choose, and your location.

On average, you can expect to pay between $9 to $17 per square foot for steel roofing installation. That's $27,000 to $51,000 for a home that is around 3,

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