What is Metal Decking: Steel Deck Types, Gauges & ...

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Galvanized metal decking exposed to ordinary atmospheric conditions does not need to be field painted for structural purposes. Often times, painting galvanized deck is desired for astechtic purposes. It’s important to note that proper steps are taken to ensure proper adhesion to galv coils if a primer is not applied at the factory. Various oils or chemicals used to prolong the life of the coil may impact paints ability to adhere properly.

On rare occasion for composite floor deck – a uncoated steel sometimes referred to as Phos-painted maybe specified. This composite deck is painted with primer on the bottom side, and either galvanized steel, bare steel on top. It is imperative that phos/painted composite deck do not have paint on top of the deck as the bonding action between concrete and steel will be adversely affected by painting the surface of a composite deck where it meets the slab.

Since bonding action is not necessary for non-composite form decks, they may be painted on one or both sides. Form decks that are non-structural after the overlying concrete slab is cured may be made from steel that is uncoated on both sides. Uncoated steel is sometimes referred to as “black,” which does not imply that it is painted with black-colored paint

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