Maintenance Guides / Exterior & Structure

Air-seal attic penetrations

Difficulty: moderateTime: 240 minsEst. Cost: $30 - $150

Why it matters

Unsealed penetrations cause 15-25% energy loss; highest-ROI retrofit.

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How to do it

  • 1

    Gather expanding foam, caulk gun, foam rings, safety gear.

  • 2

    Identify penetrations: can lights, ducts, conduit, vents.

  • 3

    Apply foam sealant around each penetration.

  • 4

    Install foam rings around can light backplates.

  • 5

    Allow foam to cure; trim excess with knife.