Which term describes horizontal structural members used to support a ceiling or floor, to which drywall or subflooring is attached?

• A. Joists
• B. Masonry
• C. Hollow-core door
• D. Means of Egress

Answer: (A)

Joists are the horizontal framing members that carry the load of a floor or ceiling and provide the surface to which drywall or subflooring is fastened. They run between bearing walls or beams and transfer loads down to the foundation, while giving a sturdy surface for attaching the subfloor or ceiling materials. In wood construction, these are typically spaced regularly (often 16 inches on center) and sized to support expected loads; metal or engineered joists serve the same role. The other options aren’t structural members: masonry is building material, a hollow-core door is a door, and means of egress is the path to safety.