Difference between Galvanized and Galvalume

Galvanised and galvalume steel are types of steel that are essentially used in building strong and durable structures and most often used in making roofs. To have an in-depth understanding of these metals and their usage, it is important to first understand what these teams mean, what makes these two types of steel different from each other and how to choose the right material. Here’s a detailed explanation for the same. 

Both these metals are not all that different from each other by definition. That said, the advantages and drawbacks of galvalume and galvanized steel differ significantly, including their longevity, durability, and performance.

Galvanized Steel

This type of steel consists of a piece of steel that is cleaned and dipped into molten zinc. Following this, the zinc hardens onto the steel, thus creating a coating of extra protection. This enables the steel to combat dents, nicks, corrosion and rust.

Galvanized steel is the go-to option when it comes to construction, fabrication and manufacturing because of its durability and high resistance to corrosion. Galvanization can be found on a majority of steel structures. In general, galvanized steel will last nearly 15-20 years, requiring minimal maintenance.

One of the significant drawbacks of galvanized steel is that if the coating of zinc is scratched off the surface, the steel is left totally unprotected and subject to failure. 

First, a tad bit of background. Galvalume was successfully invented in 1972 by Bethlehem Steel. It is basically a trademarked name, but many individuals use the term generically to describe a product of metal roofing that consists of a steel coil coated with an alloy of metal.

Galvalume consists of a sheet of steel that is dipped in a coating of aluminium (55%), zinc (43.4%), and silicon (1.6%). This unique coating imparts a greater protection to steel from the elements, which gives it the ability to outlast and outperform traditional galvanized steel. 

Overall, galvalume is ideal as a roof, trim, wall, accent and much more in a majority of building applications. Moreover, it has proven its calibre in the most extreme and harsh environments, including high-temperature areas, hurricane zones, and regions that receive heavy rainfall or snowfall.

Galvanized vs GalvalumeAs can be seen, the primary difference between galvanized and galvalume is the type of protective coating around each sheet of steel. Galvanized steel has a coating of zinc, whereas galvalume’s coating is a combination of zinc, aluminium and silicon.

Both metal types are ideal for roofing, and each has its own set of advantages and disadvantages. Galvalume is much more durable and has a greater longevity, with a lifespan that is twice that of galvanized steel. Galvanized steel, on the other hand, is more cost-effective, while still offering great performance. This makes it an ideal choice for those on a stringent budget.

Visit JSW One MSME to shop for the best quality galvalume and galvanised steel products.