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SESK: Stuff Everyone Should Know · sesk.info/home-c-caulk-quarter

ENERGY STAR says caulk is the right fix for gaps around window or door trim of what size?

Gaps of a quarter inch or less.

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  1. A quarter inch or less ✔
  2. About one inch
  3. Up to three inches

Why: Caulk fills narrow cracks. For larger gaps, ENERGY STAR points to low or non-expanding foam sealant, fiberglass strips or backer rod, then foam or caulk on top if needed.

Huh, didn't know that: Do not force backer rod into a gap so hard that the frame bends, since that can make the window or door stick.

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References

Answer: A quarter inch or less. Caulk fills narrow cracks. For larger gaps, ENERGY STAR points to low or non-expanding foam sealant, fiberglass strips or backer rod, then foam or caulk on top if needed.

  1. ENERGY STAR: Sealing Windows and Doors www.energystar.gov/saveathome/seal_insulate/sealing-window-door
    Caulk: For gaps a quarter inch or less.
    Checked 2026-10-10.

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