Which statement describes decking and its relation to roof?

• A. Sillplate secures the floor to the foundation
• B. Subfloor is the roof sheathing
• C. Joists are the roof deck
• D. Decking is the roof sheathing

Answer: (D)

Decking refers to the surface layer installed on top of the roof framing to create a solid base for the roofing materials. This layer is the roof sheathing, typically plywood or OSB, attached to the rafters or trusses to form the structural deck of the roof. The roofing material (shingles, metal, etc.) is then fastened to this deck. The other terms describe different parts: a sillplate anchors the floor to the foundation, the subfloor is the base for interior floors, and joists are the main framing members that support the roof or floor but are not the surface itself. So, identifying decking as the roof sheathing correctly matches the function and placement in the roof system.