Foil-backed Butyl Tape
This information reflects our best understanding of product composition in 2016, with the exception of the following components that have since had their composition updated: Kraft Paper (updated 2019), Release Coating (updated 2021).
In forced air heating and cooling systems, conditioned air is distributed using a duct system. Air leaks can occur at joints within the HVAC duct system. To prevent leakage, ducting can be sealed using a tape or wet-applied sealant. This CP...
In forced air heating and cooling systems, conditioned air is distributed using a duct system. Air leaks can occur at joints within the HVAC duct system. To prevent leakage, ducting can be sealed using a tape or wet-applied sealant. This CP describes a foil-backed butyl tape for indoor or outdoor use on metal ducts, glass fiber duct board, and flexible ducts, as well as on duct wrap vapor barriers. These products are commonly UL181B-FX listed. In order to meet fire-safety requirements, a mechanical fastener such as a strap, may be required along with the tape.