A single drafty door can leak enough conditioned air to add $50–$100 a year to your energy bill, according to the U.S. Department of Energy. The fix takes about 90 minutes, costs under $20, and requires nothing more than a tape measure, utility knife, and screwdriver. Weather-stripping is one of those rare home repairs where the payoff starts the same night you finish.
How to Tell Which Doors and Windows Need Attention
Close an exterior door on a piece of printer paper. If the paper slides out without resistance, the seal at that spot is shot. Repeat on all four edges — top, bottom, latch side, and hinge side.
For windows, hold a lit incense stick near the edges on a breezy day. If the smoke drifts sideways, air is getting through. Focus on the worst offenders first: entry doors, garage-to-house doors, and any window you keep closed year-round but never properly sealed.
Choosing the Right Type of Weather Stripping
Hardware stores carry several types, and each suits a different gap:
- V-strip (tension seal): Best for double-hung window channels and door frames. Lasts 3–5 years and stays out of sight once installed.
- Adhesive-backed foam tape: Easiest to install — ideal for the top and sides of door frames. Choose closed-cell foam for better compression and moisture resistance.
- Door sweeps: Close the gap between door and threshold. An aluminum-and-vinyl sweep costs $8–$12 and installs with four screws.
Skip felt — it wears out fast and handles moisture poorly. For most exterior doors, adhesive foam on the top and sides plus a door sweep on the bottom covers everything.
Step-by-Step: Weather-Stripping a Door
Start by removing old stripping. Scrape off adhesive residue with a putty knife and wipe the frame with rubbing alcohol so the new adhesive bonds cleanly. Measure each edge of the door frame separately — top, latch side, and hinge side — because older homes rarely have perfectly square frames.
Cut your foam tape to length and press it firmly along the inside of the door stop so the door compresses it when closed. Close the door and check for uniform contact all the way around. If you see daylight anywhere, add a second layer or switch to a thicker strip.
For the door sweep, close the door and mark where the bottom meets the threshold. Hold the sweep so the vinyl just touches the threshold, drill pilot holes, and screw it in. The door should close with slight resistance but not drag. If you have tackled a related project like fixing a sticking door, this process will feel familiar.
Handling the Windows
Double-hung windows benefit most from V-strip pressed into the channel where the sash slides. Cut the strip to the full height of the channel, then slide the sash up and down a few times to seat it. For casement or sliding windows, adhesive foam along the frame where the sash meets the stop works well.
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Making It Last
Inspect your seals at the start of each heating and cooling season — twice a year takes five minutes. Adhesive foam typically lasts 1–3 years depending on traffic; V-strip and door sweeps hold up for 3–5. Replace any section that looks compressed flat, cracked, or peeling. And if you are planning more small fixes, our guide to patching a drywall hole pairs well with a weather-stripping evening — once you start noticing the little things, you knock them out in batches.
Frequently Asked Questions
How much does it cost to weather-strip a door?
Most exterior doors can be fully weather-stripped for $10–$20 in materials. A roll of adhesive foam tape costs $4–$7 and a door sweep runs $8–$12. No special tools are required beyond a tape measure, utility knife, and screwdriver.
How often should you replace weather stripping?
Adhesive foam tape lasts 1–3 years under normal use. V-strip and door sweeps typically last 3–5 years. Check all seals twice a year and replace any sections that are compressed, cracked, or peeling.
Does weather stripping really lower energy bills?
Yes. The U.S. Department of Energy estimates that sealing air leaks around doors and windows can reduce heating and cooling costs by up to 20 percent. The materials typically pay for themselves within a single season.
Photo by Brett Jordan
on Unsplash
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