The _____ is the lowest member of a wood floor construction and attaches to the foundation wall using anchor bolts.

The _____ is the lowest member of a wood floor construction and attaches to the foundation wall using anchor bolts.

• A. Joist
• B. Sill
• C. Lintel
• D. Header

Answer: (B)

The bottom member of a wood floor frame is the sill, often called the mud sill. It sits directly on the foundation wall and is secured with anchor bolts that pass through the sill into the foundation. This connection anchors the entire floor system to the structure, providing a stable base for the floor joists to bear on. The joists themselves are what span across and rest on the sill, while lintels and headers are terms used for structural members above openings in walls, not for the floor’s base. So the sill is the component that is both the lowest framing member and the one attached to the foundation with anchor bolts.

The bottom member of a wood floor frame is the sill, often called the mud sill. It sits directly on the foundation wall and is secured with anchor bolts that pass through the sill into the foundation. This connection anchors the entire floor system to the structure, providing a stable base for the floor joists to bear on. The joists themselves are what span across and rest on the sill, while lintels and headers are terms used for structural members above openings in walls, not for the floor’s base. So the sill is the component that is both the lowest framing member and the one attached to the foundation with anchor bolts.