How to Fix a Drafty Window with Weatherstripping

easyHome Repair30-60 minutes8 steps

Safety Warnings

Utility Knife — Standard retractable

Tape Measure — 12-foot

Scissors — Heavy-duty

Adhesive-backed weatherstripping — V-seal or foam(As needed per window)

Rubbing Alcohol — 70% isopropyl(Small bottle)

Clean Cloth — Lint-free(1)

Identify the source of the draft by feeling for air currents around the window frame and sashes.

Tip: Do this on a windy day for easier detection.

Clean the window frame surfaces where the weatherstripping will be applied using rubbing alcohol and a lint-free cloth.

Tip: Removing all dust and oils ensures the adhesive bonds permanently.

Measure the length of the window frame sides and the bottom rail using a tape measure.

Tip: Measure twice to ensure a precise fit.

Cut the weatherstripping to the measured lengths using a utility knife or heavy-duty scissors.

Tip: Cut pieces slightly long to ensure full coverage.

Peel off the adhesive backing from the weatherstripping strip.

Tip: Peel only a few inches at a time to prevent the strip from twisting.

Press the weatherstripping firmly into the gap between the sash and the frame, ensuring a tight seal.

Tip: Apply steady pressure along the entire length of the strip.

Trim any excess material from the edges of the frame to ensure the window closes smoothly.

Tip: Use a sharp blade for a clean, professional finish.

Close and lock the window to compress the weatherstripping and test for a tight fit.

Tip: The window should require slightly more effort to close if the seal is effective.

Ensure the surface is completely dry after cleaning with alcohol before applying adhesive.
Avoid stretching the foam weatherstripping during application as it may shrink later and create new gaps.

Synthesized from 4 verified sources:

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