Which member supports the inner ends of floor joists?

Which member supports the inner ends of floor joists?

• A. Posts
• B. Girders
• C. Beams
• D. Headers

Answer: (B)

In floor framing, the inner ends of the joists are carried by girders. The girder is the main horizontal support that runs under the floor and collects the loads from the joists, transferring them down to posts or other foundation supports. This arrangement lets the joists span from the outer bearing (on a wall or ledger) to the central support, keeping the floor stable and properly supported. A post is vertical and provides support to the girder or other framing members; a beam is a broad term for a structural member that carries loads, but for this specific role the term commonly used is girders, emphasizing the primary horizontal support under the floor. A header is a horizontal member above openings and not the support for inner joist ends.

In floor framing, the inner ends of the joists are carried by girders. The girder is the main horizontal support that runs under the floor and collects the loads from the joists, transferring them down to posts or other foundation supports. This arrangement lets the joists span from the outer bearing (on a wall or ledger) to the central support, keeping the floor stable and properly supported.

A post is vertical and provides support to the girder or other framing members; a beam is a broad term for a structural member that carries loads, but for this specific role the term commonly used is girders, emphasizing the primary horizontal support under the floor. A header is a horizontal member above openings and not the support for inner joist ends.