The main component in a framed floor that supports the joists that hold the flooring board is called what?

The main component in a framed floor that supports the joists that hold the flooring board is called what?

• A. Beams
• B. Joists
• C. Trusses
• D. Girders

Answer: (D)

In floor framing, the joists are the long members that run across and support the subfloor and finish flooring. The load from those joists is carried by the largest supporting member, the girder. The girder is the main horizontal beam that spans between supports (posts or bearing walls) and distributes the joist loads down to the foundation. Trusses are used mainly for roof framing (or engineered floor systems) rather than standard floor joist systems. A beam is a broad term for a large support member, but the specific term for the primary floor-supporting member beneath the joists is girder.

In floor framing, the joists are the long members that run across and support the subfloor and finish flooring. The load from those joists is carried by the largest supporting member, the girder. The girder is the main horizontal beam that spans between supports (posts or bearing walls) and distributes the joist loads down to the foundation. Trusses are used mainly for roof framing (or engineered floor systems) rather than standard floor joist systems. A beam is a broad term for a large support member, but the specific term for the primary floor-supporting member beneath the joists is girder.