Which type of ceiling is not considered a structural ceiling?

A suspended ceiling is not considered a structural ceiling because it is typically an auxiliary layer that hangs below the main structure, serving primarily aesthetic and functional purposes—not supporting the building's load. It provides the benefit of concealing wiring, ductwork, and plumbing while allowing for easy access, but it does not contribute to the overall structural integrity of the building itself.

In contrast, concrete ceilings, steel beam ceilings, and wood plank ceilings serve as integral components of the building’s structure, supporting loads and maintaining structural stability. These types of ceilings are usually part of the building's framing system, contributing to the strength and support of the overall architecture.