SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/home-air-seal-first

In the attic, what does EPA recommend you do first?

Air seal the attic, then add insulation.

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  1. Insulate first, then air seal
  2. Air seal first, then insulate ✔
  3. Skip air sealing, since insulation stops drafts

Why: Insulation slows heat flow, but air leaks let warm or cool air sneak around it. Sealing leaks first helps the new insulation do its job.

Huh, didn't know that: Many local utilities offer rebates for home energy assessments and for air sealing and insulation projects.

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Lettuce in. It's cold out here! (Knock, knock. Who's there? Lettuce.)
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References

Answer: Air seal first, then insulate. Insulation slows heat flow, but air leaks let warm or cool air sneak around it. Sealing leaks first helps the new insulation do its job.

  1. ENERGY STAR: Attic insulation project www.energystar.gov/saveathome/seal_insulate/attic-insulation-project
    EPA recommends air sealing the attic before adding attic insulation.
    Checked 2026-10-10.

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Test yourself in the game

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That's stuff everyone should know.