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Fix a draft from outlet

We'll confirm the draft source, add a foam gasket behind the cover plate, and seal the box from the attic if accessible—or tell you when to call a pro.

Troubleshooting · Home maintenance
15–30 min per outlet
What you'll need
  • Outlet foam gaskets (sold at hardware stores)
  • Screwdriver (to remove cover plate)
  • Low-expansion foam (if sealing from attic)
  • Voltage tester or lamp (to confirm power is off)
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Steps

Goal: Confirm the draft source, then seal the outlet.

  • On a windy or cold day, hold a lit candle or incense near the outlet cover plate. If the flame or smoke moves, air is flowing through.
  • Good: You confirm the draft is from the outlet. Proceed to Add foam gasket.
  • Bad: No draft—may be from a window, door, or another source. See When to get help.

Add foam gasket

Goal: Seal the gap between the cover plate and the wall.

  • Turn off power at the circuit breaker. Test the outlet with a lamp or voltage tester to confirm it is dead.
  • Unscrew the cover plate. Look for damage—scorch marks, exposed wire. If you see any, stop and call an electrician.
  • Place the foam gasket over the outlet so the openings align with the receptacle slots. Reinstall the cover plate and tighten the screw.
  • Restore power. Feel for drafts again.
  • Good: Draft reduced or gone. Test other outlets on the same wall if needed.
  • Bad: Still drafts—if on exterior wall, see Seal from attic or call a pro.

Seal from attic

Goal: Seal gaps around the electrical box from the attic side.

  • If the outlet is on an exterior wall and you have safe attic access, go to the attic.
  • Locate the wall cavity above the outlet. Look for gaps where the electrical box meets the top plate or where wires enter.
  • Apply low-expansion foam around the box and wire entries—do not fill the box. Let the foam cure per the product label.
  • Good: Gaps sealed. Return to the living space and test for drafts.
  • Bad: Cannot locate the box or attic access is unsafe—call a pro.

When to get help

Call an electrician if:

  • You see damaged wiring, scorch marks, or sparks.
  • You need to seal from inside the wall.
  • The attic access is unsafe.
  • You are not comfortable with electrical work.

Do not work on live circuits.

Verification

  • No drafts felt when you hold a lit candle or incense near the outlet.
  • The outlet works after restoring power.
  • Foam gasket is in place behind the cover plate.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm draft source Confirm the draft is from the outlet, not a window or door.
  2. Add foam gasket Turn off power, add gasket behind cover plate, restore power.
  3. Seal from attic If on exterior wall, seal gaps around the box from the attic.
  4. Call a pro Damage, unsafe attic, or need to work inside wall—call an electrician or contractor.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Outlet location (exterior wall, interior)
  • Whether attic access is available
  • Any damage to outlet or wiring
  • Steps already tried

Do you feel drafts at the outlet?

Hold a lit candle or incense near the cover plate on a windy day. Run your hand along the wall.

On a windy or cold day, hold a lit candle or incense near the outlet. If the flame or smoke moves, air is flowing through. Good: you confirm the draft is from the outlet. Bad: no draft—may be from a window, door, or another source.

Yes No

You can change your answer later.

Do you see damage to the outlet or wiring?

Turn off power first. Remove the cover plate and look at the outlet and wires.

Turn off power at the circuit breaker. Remove the cover plate. Look for scorch marks, melted plastic, exposed wire, or a burning smell. Damage: stop and call an electrician. No damage: proceed to add a foam gasket.

Yes No

You can change your answer later.

Add foam gasket and test

Place the gasket behind the cover plate. Reinstall and tighten. Restore power.

Place the foam gasket over the outlet. Reinstall the cover plate. Restore power. Feel for drafts again. Good: draft reduced or gone. Bad: still drafts—if on exterior wall, seal from attic or call a pro.

Done

Call an electrician or contractor

Call an electrician if you see damage, sparks, or scorch marks. Call a pro if you need to seal from inside the wall, the attic access is unsafe, or you are not comfortable with electrical work. Do not work on live circuits.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why does an outlet let drafts in?
Outlets on exterior walls have a box inside the wall cavity. Gaps around the box, cracks in the drywall, or an unsealed wall cavity let outside or attic air flow through. The cover plate does not seal the opening.
Can I fix a draft from an outlet myself?
Yes. Most drafts are fixed by adding a foam gasket behind the cover plate. Turn off power at the circuit breaker first. If the outlet box is accessible from the attic, you can seal gaps with foam. Do not open the outlet box or touch wiring unless you are qualified.
When should I call a pro for a draft from an outlet?
Call an electrician if you see damaged wiring, scorch marks, or sparks when plugging in. Call a pro if you need to seal from inside the wall or the attic access is unsafe. Do not work on live circuits.

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