Which of the following is an example of a surfacing material?

• A. Pipe insulation
• B. Elbow mud
• C. Asbestos paper wrap
• D. Acoustic ceiling plaster

Answer: (D)

Surfacing material is the finish layer that you see on interior walls and ceilings, providing the final texture, appearance, and sometimes acoustical or fire-rated properties. Among these options, acoustic ceiling plaster fits that role because it is applied as a finishing layer on ceilings to create the visible surface and contribute to acoustics. The other choices are not finish surfaces: pipe insulation wraps and elbow mud are used for protection or sealing around piping and joints, not as the final ceiling or wall surface; and asbestos paper wrap is a wrap around insulation, not a finished surface you’d see as the room’s interior finish. Therefore, acoustic ceiling plaster is the correct example of a surfacing material.