What should be the insulation type for exposed ductwork in a conditioned space?

When selecting insulation for exposed ductwork in a conditioned space, fiberglass insulation is the most suitable choice. Fiberglass offers excellent thermal insulation properties, which are crucial for maintaining the desired temperatures within the ductwork and preventing energy loss. This material is non-combustible and has a high resistance to moisture, making it effective in conditions where humidity may be a concern.

Moreover, fiberglass insulation is lightweight, easy to install, and cost-effective, making it a popular choice in both residential and commercial settings. Its ability to reduce sound transmission also adds an extra benefit in environments where noise control is important.

While other insulation types may offer certain advantages in specific applications, they are generally not as well-suited for the exposure conditions of ductwork in conditioned spaces as fiberglass insulation. For instance, silicone insulation is typically more suited for high-temperature applications, foam insulation might not offer the same level of fire resistance, and mineral wool insulation, although effective, is generally heavier and may not be as cost-effective for duct applications.