What term describes an engineered collection of building components forming a cohesive structural unit such as a roof or floor?

• A. Structural assembly
• B. Sheathing
• C. Exterior bearing walls
• D. Fire cut beams

Answer: (A)

This question is about the integrated system that makes up a roof or floor—the coordinated collection of components designed to work together as a single load-bearing unit. That whole, engineered grouping is called a structural assembly. It encompasses framing members like beams and joists, the decking, and connections that transfer and support loads, all arranged to function as one cohesive unit.

Think of the other terms as parts or details rather than the complete system. Sheathing refers to the outer covering that provides a surface and some rigidity, but isn’t the entire load-bearing unit. Exterior bearing walls are the walls that carry loads from above but don’t describe the entire roof or floor assembly. Fire cut beams describe a specific detailing technique to manage fire exposure, not the whole assembled system.