May. 06, 2024
Architectural design often hinges on the choice of the right materials, especially when it comes to standing seam metal roofing systems. One frequent query from architects revolves around the differences between Galvalume and Galvanized Steel for roofing. To address this common question, we've outlined the key distinctions below.
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Firstly, a bit of background is necessary. Galvalume, invented by Bethlehem Steel in 1972, is often mistaken as a generic term but is actually a trademarked product. It consists of steel coil coated with an alloy of 55% aluminum and 45% zinc, providing it with a distinctive smooth appearance. An extension of this product, Galvalume Plus, features a thin, clear acrylic coating, facilitating easier and safer installation.
Combining zinc and aluminum, Galvalume enjoys both barrier corrosion resistance and heat resistance, akin to aluminized materials, along with galvanic protection like galvanized steel. This makes Galvalume robust against rust, elements, and fire, ensuring a durable protective covering.
While Galvalume offers superior corrosion resistance compared to galvanized steel, its aluminum component provides barrier rather than galvanic protection, making scratches and cut edges slightly more vulnerable. Available in both bare and pre-coated versions, Galvalume excels in various exposures, with a weight similar to galvanized steel. Interestingly, both materials contain about 35% recycled content. The cost comparison reveals no significant difference.
The coating on Galvalume plays a pivotal role in determining the longevity and warranty conditions of the panels. Metal roof panels have evolved from simple polyester paints to superior coatings like Polyvinylidene fluoride (PVDF), known for its outstanding chalk resistance, gloss retention, and chemical resistance.
However, not all coatings are created equal. Inferior polyester coatings, although cheaper, do not perform well in metal roofing applications. Significant price variations between painted Galvalume panels usually indicate differing coating quality.
It's crucial to note that Galvalume is unsuitable for use near concrete or mortar due to rapid corrosion in alkaline environments. In such settings, galvanized products perform better.
Furthermore, neither Galvalume nor galvanized substrates carry warranties for use in animal confinement or agricultural settings due to corrosive agents. Despite this, Galvalume panels boast excellent corrosion resistance in industrial and marine environments, and their heat reflectivity offers energy efficiency and comfort advantages in buildings.
In summary, Galvalume stands out as a superior metal roofing material, credited for its strength, corrosion resistance, and longevity. For any further inquiries about Galvalume, reach out to Englert.
Galvanized Steel Sheet refers to a carbon steel sheet coated with zinc on both sides. The production of galvanized steel involves two primary processes: continuous hot dip galvanizing and electrogalvanizing.
The hot dip process involves passing steel through a molten zinc bath, whereas electrogalvanizing applies zinc through electrolytic treatment. The zinc layer adheres firmly to the base metal through the iron-zinc bonding layer, ensuring durability.
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Galvanizing is an effective and economical method to protect steel from corrosion. The zinc coating not only acts as a barrier but also offers sacrificial protection to the steel. When exposed to water and oxygen, zinc corrodes instead of iron, preventing steel corrosion even at cut edges or drilled holes.
Widely known for its durability and corrosion resistance, galvanized steel is used in applications ranging from HVAC systems to garden decorations. The shiny, appealing finish is a result of the galvanizing process.
Galvanized steel is created by coating carbon steel with zinc, most commonly through a hot-dip process. This method involves submerging the steel in a molten zinc bath at approximately 680 degrees Fahrenheit. As the steel cools, it forms an iron-zinc alloy bond, resulting in a crystalline or bright surface finish.
Another galvanizing method is continuous galvanizing, where a continuous steel strip (coil) passes through a zinc bath at high speed. Excess zinc is removed with an air knife to achieve the desired coating thickness before the material is cooled.
Hot Dipped Galvanized Steel Sheets are ideal where corrosion resistance is crucial. The zinc coating extends product life, making it suitable for various manufacturing applications, and its appealing finish satisfies consumers.
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