What Is Foil Tape For

Aluminum foil tapes are used on seams and joints of fiberglass and aluminum backed duct board. Coated with a rubber based pressure sensitive adhesive, they provide an excellent barrier to vapor and conform to irregular surfaces. Aluminum foil tape may be used for shielding and covering thermal insulation.

What is the difference between foil tape and duct tape?

Foil-backed tape: This is the best tape for heating ducts. It uses a large amount of acrylic or butyl adhesive to resist drying out and becoming brittle. The metal foil backing also withstands temperature changes without shrinking and failing the way cloth-backed duct tape does.

Can you use foil tape on a muffler?

Don’t be stingy with the foil. Wrap a few turns around the repair, then wrap wire tightly around the foil to hold it in place. … Even better, after you’ve put on the first layer of foil, is to wrap on a layer of exhaust system repair tape, which adds some thickness to the repair, helping reduce noise.