SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/home-duct-tape

Which product does ENERGY STAR say you should never use to seal ducts?

Duct tape, because it isn't long-lasting.

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  1. Mastic sealant
  2. Metal tape
  3. Duct tape ✔

Why: Seal leaks in ducts you can reach with mastic sealant or metal tape, then insulate ducts in attics, crawlspaces, unfinished basements and garages. Ordinary duct tape does not last.

Huh, didn't know that: Most heating and cooling equipment contractors also repair ductwork.

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How does a penguin build a house? Igloos it together.
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References

Answer: Duct tape. Seal leaks in ducts you can reach with mastic sealant or metal tape, then insulate ducts in attics, crawlspaces, unfinished basements and garages. Ordinary duct tape does not last.

  1. ENERGY STAR: Duct sealing www.energystar.gov/saveathome/heating-cooling/duct-sealing
    Never use duct tape, as it is not long-lasting.
    Checked 2026-10-10.

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