What type of tape is sometimes used along with adhesive for applying flexible fiberglass duct insulation?

The use of fiber tape or foil tape alongside adhesive for applying flexible fiberglass duct insulation is common due to its durability and effectiveness in sealing seams and joints. This type of tape is specifically designed to adhere strongly to various surfaces, including fiberglass, and provides a reliable barrier against moisture and air leaks, which is essential in maintaining the thermal efficiency of the insulation.

Fiber tape or foil tape is often reinforced for added strength and can withstand a range of temperatures, making it ideal for HVAC applications. Its ability to provide a tight seal helps prevent energy loss, which is crucial for ensuring that the heating or cooling being generated is not wasted. This not only enhances the performance of the insulation but also contributes to energy efficiency in overall building systems.

In contrast, other types of tape mentioned are not suitable for this application: duct tape may not adhere properly long-term under varying temperature conditions, electrical tape is not intended for insulation applications and doesn’t provide the same sealing qualities, and masking tape lacks the strength and inherently strong adhesive quality needed for HVAC insulation work.