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Fix a draft from window

We'll locate the draft, inspect the weatherstripping and caulk, and fix or replace the seal—or tell you when to call a pro.

Troubleshooting · Home maintenance
15–45 min
What you'll need
  • Replacement weatherstripping (foam, vinyl, or rubber—match existing type)
  • Exterior-grade silicone or urethane caulk (for exterior gaps)
  • Caulk gun and putty knife (to remove old caulk)
  • Damp cloth (for cleaning)
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Steps

Goal: Confirm where the draft enters, then fix the seal.

  • Close the window and run your hand along the sash edges, meeting rail, and frame. Feel for cold or warm air.
  • Good: You locate the draft. Proceed to Inspect weatherstripping.
  • Bad: No draft felt—may be a different source (door, outlet, attic). See When to get help.

Inspect weatherstripping

Goal: Check the condition of the weatherstripping and caulk.

  • Look at the weatherstripping where the sash meets the frame—top, sides, and bottom. Check for wear (flattened or compressed), tears, gaps at corners, or missing sections.
  • Check the caulk where the window frame meets the wall—interior and exterior. Cracked, peeling, or missing caulk lets air in.
  • Good: You know what needs repair. Proceed to Replace weatherstripping or Recaulk frame.
  • Bad: Unsure—clean and reseat loose strips first, then replace if needed.

Replace weatherstripping

Goal: Remove old strips and install new weatherstripping.

  • Remove the old strip by pulling it from the channel or peeling adhesive-backed strips. Take a sample to a hardware store to match type and size.
  • Clean the sash edge and frame channel. Install the new strip—press adhesive-backed strips firmly; for channel strips, start at one end and work along the length. Cut to fit at corners.
  • Good: Continuous seal with no gaps. Test for drafts.
  • Bad: Strip will not stay—check for channel damage or call a pro.

Recaulk frame

Goal: Remove old caulk and apply a continuous bead.

  • Scrape out old caulk with a putty knife. Clean the surface with rubbing alcohol and let it dry.
  • Apply a continuous bead of caulk—interior-grade for inside, exterior-grade silicone or urethane for outside. Tool the bead with a wet finger or caulk tool. Let cure per the product label.
  • Good: No gaps and a clean, continuous seal. Test for drafts.
  • Bad: Caulk does not adhere—check surface cleanliness or call a pro.

When to get help

Call a window professional if:

  • The window is on an upper floor and requires a ladder.
  • The frame is warped or damaged.
  • You have replaced the weatherstripping and recaulked but it still drafts.
  • The window is a large picture or commercial unit.

Verification

  • No drafts felt when you run your hand along the sash edges, meeting rail, and frame.
  • Weatherstripping is flush against the frame with no gaps.
  • Caulk around the frame is continuous with no cracks or missing sections.

Escalation ladder

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

  1. Confirm symptom Locate where drafts enter—sash edges, frame, or meeting rail.
  2. Inspect weatherstripping and caulk Check for wear, tears, gaps, or missing caulk.
  3. Reseat or replace weatherstripping Clean, reseat loose strips, or replace worn strips.
  4. Recaulk frame Remove old caulk and apply a continuous bead.
  5. Call a pro High window, damaged frame, or fixes did not work—call a window pro.

What to capture if you need help

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

  • Draft location (sash, meeting rail, frame)
  • Weatherstripping condition
  • Caulk condition around frame
  • Steps already tried

Do you feel drafts at the window?

Run your hand along the sash edges, meeting rail, and frame. On a windy day, hold a lit candle or incense near the edges.

Close the window. Run your hand along the sash edges, meeting rail, and frame. Feel for cold or warm air. Good: you locate the draft. Bad: no draft felt—may be a different source (door, outlet, attic).

Yes No

You can change your answer later.

Is the weatherstripping worn or the caulk cracked?

Check the weatherstripping where the sash meets the frame. Check caulk where the frame meets the wall.

Inspect the weatherstripping for wear, tears, or gaps. Check caulk around the frame for cracks or missing sections. Worn or cracked: proceed to reseat or replace. Good condition: check for loose strips or gaps at corners.

Yes No

You can change your answer later.

Replace weatherstripping or recaulk

Remove old strips or caulk. Install new weatherstripping or apply a continuous bead of caulk.

Remove old weatherstripping or scrape out old caulk. Install new strips or apply caulk per the product label. Let adhesive or caulk cure before testing. Good: draft reduced or gone. Bad: still drafts—check for frame damage or call a pro.

Done

Reseat loose weatherstripping

Press loose strips back into the channel. Clean and reattach adhesive-backed strips.

Press loose weatherstripping back into the channel. Clean the surface and reattach adhesive-backed strips. Good: seal restored. Bad: strip will not stay—replace it.

Done

Call a window pro

Call a window professional if: the draft is not at the window (check doors, outlets, attic); the window is high and requires a ladder; the frame is warped or damaged; or you have replaced weatherstripping and recaulked but it still drafts.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why does a window let drafts in?
Common causes: worn or compressed weatherstripping, torn or missing strips, cracked or missing caulk around the frame, or gaps at the meeting rail. Check the weatherstripping and caulk first.
Can I fix a draft from a window myself?
Yes. Most drafts are fixed by cleaning, reseating, or replacing the weatherstripping and recaulking gaps. You can buy foam, vinyl, or rubber weatherstripping at hardware stores. If the window is high or the frame is damaged, call a pro.
When should I call a pro for a draft from a window?
Call a window professional if the window is on an upper floor and requires a ladder, the frame is warped or damaged, you have replaced the weatherstripping and recaulked but it still drafts, or the window is a large picture or commercial unit.

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