SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/home-a-seal-paper

In ENERGY STAR's paper test, a sheet shut in your window slides back and forth easily. What does that mean?

The window could be tighter. Add thicker weatherstripping.

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  1. The window is perfectly sealed
  2. The window could be tighter ✔
  3. The glass is too thick

Why: Close the window on a piece of paper. If the paper easily moves back and forth, the seal is loose and the window could be tighter. Thicker weatherstripping can help.

Huh, didn't know that: ENERGY STAR notes window and door projects may save less energy than attic and basement work, but they are easier to reach.

The dad joke
Why did the teacher draw on the window? Because he wanted his lesson to be very clear.
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References

Answer: The window could be tighter. Close the window on a piece of paper. If the paper easily moves back and forth, the seal is loose and the window could be tighter. Thicker weatherstripping can help.

  1. ENERGY STAR: Sealing Behind Window and Door Trim www.energystar.gov/saveathome/seal_insulate/sealing-window-door
    If it easily moves back and forth this means your window could be tighter.
    Checked 2026-10-10.

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