Galvalume Roofing Sheet

Galvalume roofing sheet is popular for commercial, residential, agricultural, and industrial applications. It is covered with a coating of aluminum-zinc alloy, which gives it superior corrosion and heat resistance.

Due to its superior performance, it is an ideal option for homeowners, contractors, architects, and investors. Wanzhi Steel has a wide range of galvalume metal roofing sheets in sizes and designs to meet your requirements. Welcome to contact us for more details!

Specifications of Galvalume Roofing Sheet

Item	Galvalume Steel Roofing Sheet
Material	GL steel (DC51D+AZ)
Thickness	0.15mm-0.8 mm
Overall Width	700mm-1,250 mm
Effective Width	600mm-1,050 mm
Al-Zn Coating Content	Aluminum (Al) 55%, zinc (Zn) 43.5%, silicon (Si) 1.5%
Al-Zn Coating Thickness	60 g/㎡-185 g/㎡
Length	As per your requirements
Standard	GB, JIS, ASTM, EN
Surface Treatment	Passivation, fingerprint resistance, oiling, pre-painting, etc.
Packaging	Standard export packaging

Benefits of Galvalume Roofing Sheet

1. Superior Corrosion Resistance

The aluminum layer offers galvalume steel excellent corrosion resistance. When the zinc is worn away, the aluminum forms a dense layer of aluminum oxide, preventing corrosion-resistant substances from further corroding the interior. So the corrosion resistance of GL sheet is 3 times that of galvanized sheet. The service life of GL roofing sheet is 2-6 times that of GI roofing sheet under the same circumstances.

2. High Heat Reflectivity

Its reflection coefficient is twice that of galvanized metal roofing sheet, which can reduce the indoor temperature in summer and reduce the power consumption of air conditioner. This feature makes it perfect for hot climates.

3. High-temperature Resistance

GL roofing sheet has good heat resistance and can withstand high temperatures of more than 300 degrees. Therefore, it can be used for a long time at high temperatures.

4. Smooth Surface & Uniform Appearance

Galvalume roofing sheet is smooth, silvery-white in color with uniform spangles. It looks beautiful and can be used directly. Hence, it is widely used in commercial and residential uses.

5. Great Formability & Adhesion

The adhesion between GL coating and paint is good, which makes it easy to paint. Also, it has great formability. That is, it is easy to stamp, cut, etc.

These features of galvalume roofing make it popular in many projects. At Wanzhi Steel, we promise to offer you quality roofing sheets. Besides, third party quality inspection is acceptable. So no matter where you will use the roofing sheets, you can try GL roofing panels.

Uses for Galvalume Roof Panels

Galvalume steel roofing 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, makeshift houses, garages, etc.
3. Industrial applications – warehouses, factories, and more.
4. Agricultural uses – barns, storage houses, greenhouses, etc.

What Is Galvalume Metal Roofing Sheet?

Galvalume metal roofing sheet is a kind of building material. It is formed with galvalume coil, which is a kind of steel coated with a mixture of 55% aluminum, 43.4% zinc, and 1.6% silicone through the hot-dip galvalume process. The aluminum-zinc alloy protects the base steel against corrosion and rust. It has many advantageous features, such as high heat resistance, superior corrosion resistance, excellent formability, high reflectivity, etc. So it is suitable for most applications, including in extreme environments.

What Color Is Galvalume Metal Roof?

Does galvalume steel come in different colors? In fact, the GL steel is silver in color. It looks not as shiny as galvanized steel. But its spangles will be more even and uniform. If you want a colorful roofing sheet, you can choose PPGI or PPGL roofing sheets. Below are two pictures of GI and GL roofing sheets for your reference.

Is Galvalume Roofing Sheet Better than Galvanized Sheet?

These two metal roofing sheets are widely used. They are used for a variety of similar applications, but their features significantly differ. Below are more details.

1. Different Materials

Galvalume sheet is coated with aluminum and zinc alloys (55% aluminum, 43.4% zinc, and 1.6% silicone), while galvanized steel is covered with pure zinc coating. For roofing sheets or floor decks (outdoor uses), the zinc layer of galvanized sheets is more than 275 g/㎡ (Z27), and 350 g/㎡ (Z35) for the coastal areas. However, if you use galvalume steel it should be more than 100 g/㎡(AZ100) and 185 g/㎡(AZ185) for floor decks.

2. Corrosion Resistance

The aluminum naturally resists corrosion to better protect the steel core against corrosion compared to galvanized sheets. The corrosion resistance of Al-Zn coating can last more than 50 years. It is proven that the service life of GL roofing will last more than 50 years, which is 20-30 years longer than that of GI roofing sheets. However, less zinc content makes anodic protection greatly reduced. That is, once the galvalume sheet is cut, the cut edge will rust quickly. So cut the GL metal as little as possible during installation. And remember to paint a layer of coating on the cut edge to prolong the service life of your roofing sheet.

3.  Heat Reflectivity

The thermal reflectivity of galvalume metal is very high, twice that of GI sheet. Therefore, as roofing sheets, GL sheets will be more suitable for the hot climate.

4. Surface

The surface of GL sheet is smooth, with even spangles. The base color is silver-white. While GI sheet is shinier, and its spangles are not even. Below are pictures for your reference.

Is Galvalume Metal Roof More Expensive?

Compared to galvanized roofing sheet, the GL metal roofing sheet will be more expensive. But it is also more durable to use. In the long term, galvalume metal roof panel is also a cost-effective solution. You can choose according to your use environment and budget. If you are in coastal climates with enough budget, we would like to recommend stainless steel sheets to you.

How Much Does A Galvalume Roof Cost?

The galvalume roofing sheets price ranges from $800 to $1,300 per ton. It price difference mainly depends on the AL-Zn coating thickness and the base steel price. If you want to know the cost to buy a galvalume metal roof, you need to know how many pieces of roofing sheets you will use first. Let’s start by calculating the weight of GL roof panels.

The weight of galvalume roofing sheet can be estimated by the formula below:

Thickness (mm) * Width (m) * Length (m) * 7.85 = (kg/pcs)

Let’s take the most popular roofing sheet thickness (0.45 mm) for example, the GL weight per square meter is about 3.53 kg. If the roofing is 10 ft (3m) in length, and 3.5 ft (1.067m) in overall width, the weight will be 11.3 kg. Then there are about 88 pieces per ton. On the other hand, you need to measure the house and work out how many pieces of roofing sheets to use. Please note that the edges of two adjacent sheets need to be lapped together. On this basis, you can roughly know the cost of buying galvalume roofing sheets. Besides, you also need to take the installation cost into account. Now you will know how much a GL metal roofing cost.

FAQs of Galvalume Roofing Sheets

Q: Is galvalume better than aluminum for roofing?

A: Considering the steel strength, galvalume is stronger than aluminum sheets since Al is kind of softer. Also, the GL sheet is much cheaper than aluminum sheets. That’s why galvalume roofing is better and more popular.

Q: How long will a galvalume roof last?

A: Generally, the service life of a galvalume metal roof is more than 50 years.

Q: Can galvalume roofing panels be painted?

A: Yes, it can be painted if you want. Galvalume coating has good adhesion. Just remember to use suitable paints.

Q: Is galvalume roofing sheet more expensive?

A: Generally, it is more expensive than galvanized roofing sheet (with the same coating thickness). But the GL metal roof price is not the most expensive. Moreover, it can last more than 50 years. The long lifespan makes it more cost-effective.

Request Galvalume Roofing Sheets Price

Wanzhi Steel has a hot-dip aluminum-zinc (55% Al-Zn) production line with an annual production capacity of 200,000 tons. And we also have many sets of rolling mills and shearing equipment to profile the steel coils into corrugated sheets for roofing.

At Wanzhi Steel, we can offer galvalume roof panels from 0.15 to 0.8 mm in thickness, and 600mm to 1,250mm in width. The length can be customized to your projects. The common surface processing methods available include passivation, fingerprint resistance, oiling, and others.

All these factors will influence the GL roofing sheet price. As a wholesale supplier, we would like to offer you the most cost-effective solution. Below are something you need to confirm first.

1. The size of the galvalume roofing sheet, including the thickness, width, length, Al-Zn coating thickness;
2. You can send us a sample or picture to confirm the corrugation design.
3. How many pieces or tons do you need? The MOQ is 25 tons. And we will offer great discounts for bulk orders.
4. When will you use these roofing sheets?
5. Your special requirements, such as the packaging, surface treatment, etc. If you are not sure, please contact our sales manager for professional tips.