Which component runs parallel with the ceiling and serves as a central support for the floor system?

Which component runs parallel with the ceiling and serves as a central support for the floor system?

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

Answer: (C)

In floor framing, the main member that provides central support for the floor and often runs along the room in line with the ceiling is the girder. A girder is a large, sturdy beam that carries the loads from the joists and transfers them to vertical supports such as columns or walls. It acts as the backbone of the floor system, typically positioned near the center to reduce the span that lighter joists must cover. Joists themselves span between supports and are supported at their ends by girders and walls, while beams are smaller members that help carry loads between joists and girders. Trusses are used for roof framing, not for central floor support. So, the component described is the girder.

In floor framing, the main member that provides central support for the floor and often runs along the room in line with the ceiling is the girder. A girder is a large, sturdy beam that carries the loads from the joists and transfers them to vertical supports such as columns or walls. It acts as the backbone of the floor system, typically positioned near the center to reduce the span that lighter joists must cover. Joists themselves span between supports and are supported at their ends by girders and walls, while beams are smaller members that help carry loads between joists and girders. Trusses are used for roof framing, not for central floor support. So, the component described is the girder.