What type of steel deck is made by attaching a bottom steel sheet to a panel?

• A. Composite deck
• B. Roof deck
• C. Cellular deck
• D. Form deck

Answer: (C)

Cellular deck is defined by attaching a bottom steel sheet to the back of the deck panel, which creates sealed hollow cells between the top profile and the bottom sheet. Those cells form a lightweight yet stiff core, allowing the deck to span longer distances and carry loads effectively. The bottom sheet closing the cells is the key feature that distinguishes this deck type from others, making it the right answer. Form deck is temporary for concrete formwork, while roof deck is a general term and composite deck relies on the concrete slab for strength rather than a cellular core.