Understanding the different types of metal deck finishes before getting your next project started can help you get the best end result. In this article we will review the four different types of metal deck finishes:
- Galvanized
- Galvanized and prime painted
- Prime painted gray
- Phosphotasized and prime painted
Metal Deck Finishes Overview
Galvanized Metal Decking
This is the most commonly used type of metal deck and it is the standard for pretty much all metal floor deck and metal roof deck projects.
Galvanized metal decking is usually preferred because the finished coat of paint does not need to be applied to the metal decking. This type of metal decking is also suggested in corrosive or high moisture environments.
Galvanized and Prime Painted
Galvanized and prime painted metal deck is not very common in traditional construction projects. This type of metal deck finish is usually used in jobs that have a longer span, are exposed to frequent weather events, or that need to achieve a particular architectural look or style. If metal decking cannot be ordered with an architectural paint finish, it needs to be painted in the field. This job is more easily done when the metal deck comes with factory primer.
The issue with using galvanized and prime painted metal decking is the availability factor. This material is hard to find immediately. The typical lead time to acquire this type of material is 3-5 weeks due to minimum order quantities, which will vary depending on the supplier.
Prime Painted Gray Metal Decking
Prime painted gray metal decking is usually found in applications where the metal deck does not have to be exposed. The most common application includes a built up roof that’s installed on top of the metal decking.
The prime painted B deck is preferred because it is a cost effective option. The drawback is that if the material is left exposed to the weather, it will rust easily.
Phosphatized and Painted Metal Decking
Phosphatized and painted metal decking has a top deck that is neither galvanized nor painted, paired with a primed and painted finish on the bottom. The top of this metal decking is ideal for forming a chemical bond with concrete, which would be poured over it on-site.
Phosphatized and painted metal decking tends to be cheaper than other alternatives that include galvanized finishes. This makes a difference when taking into account larger scale jobs, for example a high-rise building.
We strongly recommend applying a paint finish to this material in order to prevent rust stains.
CSM Metal Deck Finishes
Most floor deck projects use a galvanized metal decking finish, while roof deck projects tend to be galvanized or gray prime painted. Not often you will see the other finishes. It is crucial to always use a galvanized finish if the top or bottom panels will be exposed to the weather. If this rule of thumb is not applied, the panel will develop red rust streaks.
At CSM Products & Solutions, our manufacturing team has the necessary knowledge and tools to create metal deck that meets the needs of your small-scale construction project. If you need guidance or recommendations on which finish is best for your particular construction application, please contact us today.
