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"A deck that can be built onto a ship frame."
A deck piece is a structural ship component which is automatically generated along flat sections of a ship being built. You can also craft deck pieces to replace lost ones or to change their material from an Assembly Station.
Crafting Page: Deck
Decks can only be placed in areas between ship frame beams which are completely horizontal. No tilt allowed. In the ship editor the corresponding sections are filled with a purple colour.