What is a main horizontal wood or steel component that runs parallel with the ceiling and acts as a central support?

What is a main horizontal wood or steel component that runs parallel with the ceiling and acts as a central support?

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

Answer: (A)

In framing, the main horizontal load‑bearing member that runs parallel to the ceiling and acts as a central support is a beam. Beams carry the loads from above (such as floors or upper walls) and transfer them to vertical supports like walls or columns. They run lengthwise under the joists, which typically rest on them, so the beam serves as the primary backbone that holds the structure together along that axis. Joists are lighter members that span across the beams, usually running perpendicular to them, and they support the floor or ceiling surface. Girders are larger, heavier beams that support other beams rather than directly carrying the floor or roof loads themselves. Trusses are frameworks of triangles used to support roofs, not a single horizontal central support member like a beam. So the best match for the description—main horizontal component running parallel with the ceiling and providing central support—is beam.

In framing, the main horizontal load‑bearing member that runs parallel to the ceiling and acts as a central support is a beam. Beams carry the loads from above (such as floors or upper walls) and transfer them to vertical supports like walls or columns. They run lengthwise under the joists, which typically rest on them, so the beam serves as the primary backbone that holds the structure together along that axis.

Joists are lighter members that span across the beams, usually running perpendicular to them, and they support the floor or ceiling surface. Girders are larger, heavier beams that support other beams rather than directly carrying the floor or roof loads themselves. Trusses are frameworks of triangles used to support roofs, not a single horizontal central support member like a beam.

So the best match for the description—main horizontal component running parallel with the ceiling and providing central support—is beam.