What Is Galvanized Metal Decking? [G30 G60 Or G90] | FAQs

What is Galvanized Metal Decking?

Metal decking is essential for most developments, as it helps support the structural base as well as the roofing sections. And while there are many types of metal decking that are available, there are also several finishes that can be selected. The most common type of metal deck is galvanized metal deck.

Learn about why galvanized metal deck is so popular, the benefits and key uses for this type of decking and more. Here's a closer look:

The Process

Galvanized steel is essentially metal decking that has a protective coating added to it. The coating, which is most commonly made from zinc, helps to prevent rust. Galvanized metal decking is created via hot dip galvanizing process, which consists of placing steel into an acid bath to remove the surface scale. Once the acid bath removes this surface scale, the metal is then dipped into a molten zinc bath, whereby the zinc bonds to the steel to provide that protective coating. The coating also helps make the steel more malleable.

G60 and G90 Metal Deck

Galvanized metal deck is available in two main varieties: G60 and G90. G60 metal deck has about 0.6 ounces of zinc per square foot, while G90 metal deck has 0.9 ounces per square foot. G60 is the most common type of galvanized metal decking, while G90 is more often used on projects in corrosive environments, such as near the sea.

Benefits/Uses for Galvanized Steel

The main reason why galvanized metal decking is so popular is that it is durable, non-corrosive and long-lasting. The zinc coating acts as the protective barrier between the steel material and oxygen and moisture from the environment.

Once it's installed, it's unlikely to require repair or replacement for decades. It's also malleable and able to be crafted into various decking styles and patterns. It's ideal for just about any type of project, which is why it's the most popular type of metal decking.

Finally, galvanized metal decking is also very easy to inspect for quality. All it takes is a simple stress test to help determine how thick the zinc coating is.

Galvanized Steel Finishes

Some common galvanized steel finishes include:

Galvanized and prime painted: While not common, it's utilized in developments that are exposed to weather and require a more architectural finish. Prime painted and gray decking: This tends to be used in environments where the deck is not exposed. Phosphated and painted: Another uncommon variety, this decking is where the top is not galvanized or painted.

Contact O’Donnell Today

For more information on galvanized metal decking or to place an order for your next project, contact O’Donnell Metal Deck & Bar Joist today.