Which form of fiberglass insulation is commonly used as a flexible wrapping material around ducts and pipes?

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

Answer: (C)

Fiberglass wrap is used because it is flexible and can conform to curved ducts and pipes. This form comes as pliable rolls or sheets with a facing (like foil or kraft) that helps act as a vapor barrier and seal seams. When wrapped around a duct or pipe, it creates a continuous insulating layer, reducing heat loss or gain and improving overall HVAC efficiency. Batt insulation is designed for flat cavities between studs or joists, not for wrapping cylindrical shapes. Board insulation is rigid and used on flat surfaces, not for wrapping around curves. Pre-formed pieces may fit certain shapes but aren’t the general wrapping material for ducts and pipes.