Description of Galvalume Roofing Sheet

Galvalume roofing sheet is popular in commercial, residential, agricultural, and industrial applications. It is covered with a coating of aluminum-zinc alloy, which gives it excellent corrosion and heat resistance. Due to its superior performance, it is ideal for homeowners, contractors, architects and investors. Wanzhi Steel manufactures a wide range of metal roofing products in different materials, including GI, GL, PPGI and PPGL in various sizes and designs to meet your requirements. Feel free to contact us for more details!

Galvalume Roofing Sheet
Galvalume Roofing Sheets
Galvalume Roofing Sheet (2)
GL Roof Panels

Specifications of Galvalume Roofing Sheet

Item Galvalume Roofing Sheet
Coating Al-Zn alloy
Thickness 0.13-1.2 mm
Width 600-1250 mm
Length As per your requirements
Surface Treatment Coated or bare galvalume
Packaging Standard export packaging

Application of Galvalume Roofing Sheet

Galvanized steel sheets are used for residential and commercial roof installation projects.
1. Commercial buildings – hospitals, schools, stores, government buildings, etc.
2. Residential projects – private homes, apartments, temporary housing, garages, etc.
3. Industrial applications – warehouses, factories, etc.
4. Agricultural applications – barns, storage rooms, greenhouses, etc.

Galvalume Roofing Sheet (4)
Galvalume Roofing Sheet (3)

What is the difference between galvanized roofing and galvalume roofing?

When completing a project with corrugated sheeting, should you choose galvanized metal roofing or galvalume metal roofing?

The answer lies in the difference between the two. Traditional galvanized metal roofing is a corrugated carbon steel sheet with a galvanized coating. This coating is formed by dipping the straight sheet into hot, molten zinc. The zinc ions combine with the iron molecules in the steel to form a shiny, rust-resistant coating on its surface. This process is known as galvanizing.

After the coating hardens, the sheet is placed in a cold forming corrugation process that bends the sheet into a parallel linear pattern. These “corrugations” give the sheets greater strength and stability when installed as a roof.

Bethlehem Steel’s patented Galvalume process, invented in 1972, is similar to galvanizing, but also adds aluminum and silicon to the zinc. As the coating dries, patches of aluminum and zinc molecules coalesce into a pattern on the surface of the sheet. The aluminum zone provides corrosion resistance, while the zinc provides galvanizing protection. A small amount of silicon helps the coating adhere to the underlying metal, even when it is cut or rolled into a corrugated pattern.

So, which is better for roofing? Each type has advantages and disadvantages.

Galvalume’s extra corrosion resistance means scratched, bent, or cut edges won’t rust as quickly, and it’s also a better choice in rainy climates and salty air.

The paint does not adhere well to Galvalume, so the aesthetic appeal may not be as good. In addition, Galvalume costs more than galvanized metal roofing – but the fact that Galvalume metal roofing will last twice as long as galvanized roofing of the same thickness can make up the difference. For these reasons, Galvalume metal roofs are more popular.
Typically, galvanized sheet metal roofing is used primarily for agricultural buildings where rusting is not as much of a problem and costs must be kept low. Galvanized metal roofing may also be used by architects looking for a traditional, rusty look in new construction.

What Is Galvalume Metal Roofing?

Galvalume metal roofing sheets are coated with a blend of 55% aluminum, 43.4% zinc, and 1.6% silicone to protect the base steel from corrosion and rusting. Therefore, it is suitable for most applications, including in extreme environments. In addition, galvanized steel roofing offers a smaller, smoother patina, which results in a more uniform surface. Let’s review the differences between galvanized roofing panels and aluminized zinc roofing panels.

Galvanized Roofing Panels VS Galvanized Roofing Panels
These two types of metal roofing panels are steel substrates that are coated with different coatings and then molded into the corrugated design of the roof. Their characteristics are very different.

Galvanized panels are coated with an aluminum and zinc alloy (55% aluminum, 43.4% zinc, 1.6% silicon), while galvanized steel is covered with a zinc coating. Compared to galvanized sheets, aluminum has a natural ability to resist corrosion and better protects the steel core from corrosion. This means that galvanized sheet has better corrosion and heat resistance than galvanized materials. It is proven that GL roofing will last over 60 years, which is 20-30 years longer than GI roofing sheets.

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