Which fiberglass form is commonly used as flexible wrapping around pipes or ductwork?

• A. Pre form
• B. Board
• C. Wrap
• D. Batt insulation

Answer: (C)

The idea here is choosing a fiberglass form that can fit around curved and irregular shapes. Flexible wrapping is the one that works best for pipes and ductwork because it comes in rolls that can be wrapped around cylinders and bends, cut to length, and secured with tape or adhesive. This form is designed to conform to the surface, providing insulation along the entire length of a pipe or duct and, if foil-facing is present, acting as a vapor barrier as well.

Pre-formed shapes are molded for specific, often straight or simple geometries, so they don’t adapt easily to pipes and bends. Boards are rigid panels used for walls or other flat surfaces, not for wrapping. Batt insulation is a blanket-like form that fits into cavities between studs or joists but isn’t the flexible wrap used for wrapping around pipes. So, the flexible wrap stands out for its ability to follow the contour of pipes and ductwork.