Galvalume Metal Roof

Galvalume metal roof is a roofing material with galvalume steel plate as the main material. It has excellent weather resistance and corrosion resistance, as well as high heat resistance and insulation performance. It uses hot-rolled steel plate as the substrate, and a layer of aluminum-zinc alloy is plated on the surface of the steel plate by hot-dip plating. It is widely used in roof construction and architectural decoration. Wanzhi Steel Factory stocks a large number of regular-sized GL steel metal roofs. The substrate, thickness, width, and surface treatment can be customized, and mechanical processing services such as perforation and striping are provided. If you want to know more, please contact us

Specifications of Galvalume Metal Roof

Item	Galvalume Metal Roof
Place of Origin	Shandong, China
Standard	AISI, ASTM, DIN, JIS, GB, EN
Delivery Time	15-21 days
Steel Grade	DX51D, DX52D, DX53D, CGCC, CGCH
Surface treatment	Hot dip galvalume
Al-Zn Coating	AZ30-AZ150
Color	Silver
Width	≤ 1500 mm
Coil Weight	3-8 tons or as per your requirements
Surface treatment	Spray painting, fingerprint resistance, oiling, passivation, lamination, etc.
Aluminum Content	55%
Sample	Free Available
Payment term	TT 30% Advance + 70% Balance
Price Item	FOB, CIF, EXW, CFR, etc
Packing	Standard export packaging
Certification	ISO 9001, SGS, ABS, BV
MOQ	5 Tons

What Is Galvalume Metal Roof?

Galvalume metal roofing is a type of roofing sheet made from galvanized steel sheets. Galvalume steel roof combines the advantages of aluminum and zinc. Through hot-dip plating technology, a tightly adherent aluminum-zinc alloy layer is formed on the surface of the steel plate. This alloy is mainly composed of 55% aluminum, 43.4% zinc, and 1.6% silicon solidified at a high temperature of 600°C. Its entire structure is composed of aluminum, iron, silicon, and zinc, forming a dense quaternary crystal. It has excellent weather resistance, corrosion resistance, and good heat resistance.

How Long Does A Galvalume Metal Roof Last?

Galvalume metal roofs have a relatively long lifespan. Generally, if properly installed and maintained, they can last 20 to 50 years or even longer. The specific lifespan depends on the quality of the materials, installation techniques, exposure, maintenance efforts, and environmental conditions. To ensure a longer lifespan, it is critical to select high-quality materials. Regular maintenance, such as cleaning and repainting, will extend its lifespan.

Common coating thickness

• AZ50: economical, with relatively thin coating and low cost, suitable for projects that are cost-sensitive and have low environmental corrosion.
• AZ70: thicker coating than AZ50, with improved corrosion resistance and life, and better economy.
• AZ100: has good corrosion resistance, heat resistance, and processing performance, can be used for a long time at high temperatures of 315°C, and has excellent adhesion with paint, and can be painted without pretreatment and weathering.
• AZ150: excellent performance, thicker coating, stronger corrosion resistance, service life is 2-6 times that of ordinary galvanized steel sheets with the same coating thickness, excellent heat reflection performance, the ability to reflect heat and light is twice that of hot-dip galvanized steel sheets, and the reflectivity is greater than 0.70.

What Are The Advantages Of Galvalume Metal Roof?

• Excellent resistance to cut corrosion: The zinc-aluminum coating composition gives its cut an electrochemical protection effect, which is better than hot-dip galvanized steel sheets with the same coating thickness, and shows excellent resistance to cut corrosion in the middle and late stages.
• Excellent heat resistance: Galvalume steel sheets have good reflectivity to light and heat, and can be used for a long time in a working environment of 300°C, and for a short time in a high temperature environment of 500~600°C, while pure zinc coating is generally limited to use at room temperature.
• Beautiful appearance: It has a beautiful silver-gray appearance, shiny surface grains, and small crystals; its ability to reflect heat and light is twice that of hot-dip galvanized steel sheets. It can be used as a heat protection layer and is an ideal energy-saving building material.
• Higher economy: The initial cost is higher than that of galvanized steel, but in the long run, its rust resistance and life are better than those of galvanized sheets. Therefore, it has a high comprehensive cost-effectiveness and requires almost no maintenance.
• Good processing adaptability: It can replace galvanized steel in occasions with high corrosion resistance requirements or high processing performance requirements. It has better atmospheric corrosion resistance and humid gas corrosion resistance than galvanized sheet, good bending formability, unidirectional ductility, and weldability. It has strong adhesion to paint and can be used asa color-coated substrate and printed substrate.

Where Is Galvalume Metal Roof Used?

• Industrial buildings: used for the roof construction of industrial plants and warehouses. Or places such as logistics centers that require large-area roof coverage.
• Commercial buildings: It is an ideal choice for the roofs of commercial buildings such as shopping malls, supermarkets, office buildings, and hotels.
• Agricultural buildings: used for agricultural greenhouses and livestock and poultry houses, barns, granaries, greenhouse structures, and simple housing structures of transfer stations.
• Civil and public buildings: used for roof construction of residential and villas or public facilities such as schools, hospitals, and gymnasiums, providing reliable solutions.
• Coastal/high temperature areas: Due to the serious salt spray corrosion in coastal areas, Galvalume steel plates have become the preferred material. In high-temperature environments, its heat resistance ensures the stability and safety of the roof.
• Renovation and renovation projects: For old roofs that need to be renovated and old house renovations, Galvalume steel plate roofs can be used as an economical and efficient alternative, which is easy to install and economical.

WanZhi GL Metal Roof Production Process

1. Pre-treatment of steel plates

First, degreasing treatment to remove grease, dust, and other impurities from its surface. The process includes acid washing, i.e., the steel plate is immersed into the acid washing solution, to remove the oxides and dirt on the surface by mechanical agitation. Then, it is put into the neutralization tank to neutralize the acid and alkali on the metal surface.

2. Purge

The pre-treated steel plate enters the cleaning tank for deep cleaning to remove residual acids, alkalis, and impurities from the surface. Solvents and cleaning agents are added to the cleaning tank. Common solvents are clean water and alcohol, and common cleaning agents are alkaline and acidic cleaning agents. Cleaning time is usually 5-20 minutes.

3. Hot-dip aluminum zinc plating

After cleaning, the steel plate is subjected to hot-dip aluminum-zinc plating. In this process, the steel plate passes through a plating bath filled with molten aluminum-zinc alloy. Through the hot-dip plating process, the aluminum-zinc alloy evenly covers the surface of the steel plate to form a layer of aluminum-zinc alloy plating. This coating significantly improves the corrosion resistance and service life of the steel plate.

 

Which is the best? Galvalume vs Galvanized vs Aluminum Roofing?

Determining which roofing material is “best” between Galvalume, Galvanized steel, and Aluminum roofing depends on specific needs and preferences. Each material has its own advantages and disadvantages.

Metal Roof Types	Capability
Galvalume Metal Roof	1. Combines the corrosion resistance of aluminum with the strength of steel. 2. Offers excellent durability and can resist corrosion even in salty or industrial environments. 3. Maintains its appearance well and resists fading. 4. Its price is higher than the other two metals.
Galvanized Steel Roofing	1. Galvanized steel roofing is coated with a layer of zinc to protect it from corrosion. 2. Available in a wide range of colors and styles. 3. It is generally less expensive than Galvalume but may not offer the same level of corrosion resistance. 4. If your requirements are not particularly demanding, it is recommended to choose Galvanized Roof Sheet.
Aluminum Metal Roofing	1. Aluminum roofing is lightweight and resistant to corrosion. 2. Offers good durability and can withstand extreme weather conditions. 3. It is recyclable, making it an environmentally friendly choice. 4. It is less hard and more prone to dents and scratches than other materials.

Price

Key factors affecting galvalume metal roofing pricing:

1. Material cost: Base steel price and galvalume coating grade (e.g., AZ50, AZ100) affect cost.

2. Gauge/thickness: Thicker panels (22Ga vs. 26Ga) are more durable but more expensive.

3. Finishes and coatings: Additional coatings (e.g., PVDF coatings) improve weather resistance and increase price.

4. Profiles and designs: Complex shapes (standing seam vs. corrugated seam) increase manufacturing costs.

5. Quantity and logistics: Bulk orders reduce unit costs; distant locations increase shipping costs.

FAQs of WanZhi Galvalume Metal Roof

Q: Is it OK to pressure wash a  Galvalume metal roof?

A: It hardly needs cleaning, and if it does. Use the right nozzle, Start with a low pressure setting, Maintain a consistent distance , Avoid harsh chemicals, Rinse thoroughly.

Q: How do you maintain a metal roof?

A: Regular inspection, cleaning the roof debris, soil, and checking the drainage system, can be regularly coated maintenance. There is damage in time to repair and replace, and timely sweeping guttering.

Q: What is the chemical composition of Galvalume?

A: The chemical composition of galvalume consists mainly of aluminum, zinc, and silicon.

Q: What are the common surface treatments for Galvalume Metal Roof?

A: Dry, Oil, Chromate, AFP/ Galva clean, Non-Gr/Gr-free.

Why choose Wanzhi Steel for your galvanized metal roof?

Wanzhi Steel provides premium galvanized metal roof solutions with 55% aluminum-zinc alloy coating for superior corrosion resistance and heat reflectivity. Advantages of our factory ensure you get the best value:

• Fully equipped: advanced coil coating line for uniform surface treatment, paint coating service.
• Customized specifications: All substrates, corrugation shapes, and plate thicknesses of various specifications (such as 22- 26 Gauge) are available.
• Quality assurance: Comply with ASTM A792/A653 standards, all products are strictly inspected before leaving the factory, and third-party quality inspection is accepted.
• Fast delivery: Competitive FOB/CIF price, long-term inventory of regular size GL plates, covering an area of ​​1,000 square meters, and a production capacity of 600,000 tons/year

Request a quote now and enjoy our steel expertise – trusted durability!