Define a joist.

Define a joist.

• A. horizontal framing member used to construct walls
• B. vertical support for roof
• C. curved beam
• D. decorative trim

Answer: (A)

Joists are horizontal framing members that support floors or ceilings, spanning between walls or beams and carrying loads down to the foundation. They are part of the floor/ceiling structure, not used to frame walls. Wall framing uses vertical studs and horizontal plates, not joists. The other descriptions refer to different elements: a vertical roof support would be a rafter or post, a curved beam isn’t typical for floor or ceiling framing, and decorative trim is purely cosmetic. In practical terms, you’ll encounter joists sized and spaced to support the floor or ceiling loads, distinct from the components that form walls.

Joists are horizontal framing members that support floors or ceilings, spanning between walls or beams and carrying loads down to the foundation. They are part of the floor/ceiling structure, not used to frame walls. Wall framing uses vertical studs and horizontal plates, not joists. The other descriptions refer to different elements: a vertical roof support would be a rafter or post, a curved beam isn’t typical for floor or ceiling framing, and decorative trim is purely cosmetic. In practical terms, you’ll encounter joists sized and spaced to support the floor or ceiling loads, distinct from the components that form walls.