G60 And G90 Hot Dipped Galvanized Metal Deck Explained

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While placing a metal decking order, you may have come across the terms G90 and G60 Galvanized. In this article, we explain what these terms mean so you can have a clear understanding if you need galvanized metal decking for your next commercial construction project.

Metal deck steel sheets are galvanized to protect them from rusting. Given this information, let’s break down the definitions of “hot-dipped galvanized” and “G60 and G90.”

Hot Dipped

In order to galvanize steel or iron for your metal deck, you need to use Zinc. In the hot-dipped galvanization process, the steel sheet is immersed in molten zinc at a temperature of 850 degrees Fahrenheit. During this process, the steel sheet and zinc form zinc-iron intermetallic layers. The zinc coating ends up on top of the sheet because it is more reactive than iron.

G60 & G90 Galvanizing

The numbers included in G60 and G90 galvanizing signify the quantity of Zinc in the coating on the steel sheet. This means that G60 has a designated coating of 0.60 oz/square foot while G90 has a designated coating of 0.90 oz/square foot. This is the total weight of Zinc on both sides of the sheet. There are lighter and thicker coating as well, like G30 and G140, however, G60 and G90 tend to be the most commonly used.

Hot dipped G60 galvanized steel is the most common galvanized metal coating, however, this is mostly used indoors. If you are performing an outdoor project, we highly recommend a hot dip G90 galvanized coating because the high-moisture outside is more likely to result in rust if your metal deck is not sufficiently coated.

High-Quality Metal Deck from CSM

At CSM, we produce metal roof and floor deck in a variety of widths, depths, and gauges, using G60 and G90 galvanized steel.

Experience the difference of a long-lasting, high-quality metal deck from a knowledgable manufacturer. Contact us today to get started on your order of metal deck. Our staff will be happy to help you find the best product for your specific needs.

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At CSM we know metal deck. We have been supplying metal deck throughout the country for over 50 years. Choose from metal roof deck, composite deck and form deck, in a variety of depths, widths and gauges.

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