Which term describes an engineered framing for the floor?

The term that best describes an engineered framing for the floor is "floor truss." Floor trusses are specifically designed and manufactured structural members that provide support for flooring systems by spanning between load-bearing walls or beams. They are typically used in modern construction because they offer several advantages over traditional floor joists, such as greater spans, reduced weight, and the ability to incorporate space for mechanical, electrical, and plumbing systems.

Floor joists, while also crucial components of flooring systems, refer to individual horizontal framing members that support the floor. They do not carry the same engineered design principles as floor trusses, which are assembled in a factory to specific engineering specifications.

Floor beams are larger structural supports that carry loads from the joists or trusses, but they are not the primary framing that directly supports the floor surface. A floor slab refers to a solid concrete foundation used in some construction types but does not pertain to engineered framing in the same sense as trusses do. Thus, the correct answer is inherently linked to the engineered nature of the floor structure, which is defined by the characteristics of a floor truss.