Which layer is placed over the joists to provide a base for finished flooring?

Which layer is placed over the joists to provide a base for finished flooring?

• A. Joists
• B. Drywall
• C. Subflooring
• D. Sheathing

Answer: (C)

The layer placed over the joists to provide a base for finished flooring is subflooring. It sits directly on the joists, giving you a flat, continuous surface that finish flooring can be securely attached to. Subflooring is usually plywood or OSB and is fastened to the joists to distribute loads, reduce movement, and provide a solid nailer or adhesion surface for the final floor. Drywall is used on walls, not floors, and sheathing is the structural exterior or floor panels used to stiffen the building, not to serve as the base for finished interior floors. With subflooring in place, the finished floor has a stable foundation that helps prevent movement, squeaks, and damage.

The layer placed over the joists to provide a base for finished flooring is subflooring. It sits directly on the joists, giving you a flat, continuous surface that finish flooring can be securely attached to. Subflooring is usually plywood or OSB and is fastened to the joists to distribute loads, reduce movement, and provide a solid nailer or adhesion surface for the final floor. Drywall is used on walls, not floors, and sheathing is the structural exterior or floor panels used to stiffen the building, not to serve as the base for finished interior floors. With subflooring in place, the finished floor has a stable foundation that helps prevent movement, squeaks, and damage.