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If you can feel cold air coming in around your exterior doors, you’re paying for it every month. A drafty door can add 10–15% to your heating and cooling costs — and the fix costs less than $30 in materials and takes about an hour.
Weatherstripping is the rubber, foam, or vinyl seal that runs around a door frame to block air, water, and noise. It wears out over time and needs replacing every 5–10 years. When it fails, you feel it — cold drafts in winter, hot air in summer, and higher energy bills year-round.
Quick answer: Remove the old weatherstripping, clean the door frame, measure and cut the new strip to length, and press or nail it in place. For the bottom of the door, install a door sweep to seal the gap between the door and the threshold.
Before You Start
Identify where the draft is coming from
Close the exterior door and run your hand around the entire frame — top, both sides, and bottom. Feel for air movement. You can also hold a lit candle near the frame on a windy day — the flame will flicker where air is entering.
Most drafts come from one of two places:
- Around the sides and top of the door — worn weatherstripping on the door frame
- Under the door — a worn or missing door sweep
Often it’s both. Replace both while you’re at it — the materials together cost under $30.
Types of weatherstripping
- Foam tape: Adhesive-backed foam strip. Cheapest option, easiest to install, wears out fastest (2–3 years). Good for low-traffic doors.
- V-strip (tension seal): Folded metal or plastic strip that creates tension against the door. More durable than foam, lasts 5–7 years. Best for the sides of doors.
- Door sweep: Rubber or brush strip that attaches to the bottom of the door and seals the gap against the threshold. Essential for the bottom of exterior doors.
- Door seal kit: Combines weatherstripping for the sides and top with a door sweep. Most convenient option for a complete replacement.
Our picks:
- M-D Building Products Door Seal Kit — includes foam weatherstripping for sides and top plus a door sweep. Fits most standard doors. About $15.
- Pemko 18061CNB Door Sweep — aluminum with rubber seal, more durable than adhesive sweeps. About $20.
- Duck Brand Self-Adhesive Foam Weatherstrip — budget option for low-traffic interior doors. About $6.
Tools needed
- Utility knife or scissors
- Tape measure
- Hammer and finishing nails (for nail-on weatherstripping)
- Flathead screwdriver (to remove old weatherstripping)
- Clean cloth and rubbing alcohol
Step 1: Remove the Old Weatherstripping
Open the door and examine the existing weatherstripping on the door frame (the stop molding — the narrow strip the door closes against).
For adhesive-backed foam or rubber: pull it away from the frame. It usually peels off in sections. Remove any remaining adhesive residue with rubbing alcohol and a clean cloth — new weatherstripping won’t stick to old adhesive.
For nail-on or stapled weatherstripping: use a flathead screwdriver and pry it away from the frame. Remove any remaining staples or nails with pliers.
For the bottom door sweep: unscrew it from the bottom edge of the door and remove.
Let the frame dry completely before installing the new weatherstripping.
Step 2: Measure and Cut the New Weatherstripping
Measure the door frame in three sections:
- Top (header): width of the door frame opening
- Left side: height from the threshold to the top corner
- Right side: height from the threshold to the top corner
Add 1–2 inches to each measurement — you can always trim, but you can’t add length. Cut the weatherstripping with scissors or a utility knife.
For the door sweep, measure the width of the door at the bottom edge.
Step 3: Install the Side and Top Weatherstripping
Work from the top down: install the header piece first, then each side piece.
For adhesive-backed weatherstripping:
Peel the backing off one end and start at one corner of the door stop (the narrow molding the door closes against). Press the strip firmly into place, peeling the backing as you go. Work slowly — repositioning adhesive-backed strips is difficult once they contact the surface.
At corners, cut the strip at a 45-degree angle for a clean miter joint. This looks better and seals more completely than butting two straight cuts against each other.
Press the entire length firmly with your fingers, then run a putty knife or the back of a spoon along the strip to ensure full contact.
For V-strip weatherstripping:
Cut each piece to length. Slide the V-strip into the door stop groove with the open end of the V facing toward the door opening — this is what creates the sealing tension. Nail in place with finishing nails every 2–3 inches, or use the self-adhesive backing if included.
Test the fit before finishing:
Close the door slowly and check that it closes completely without the weatherstripping causing resistance. The seal should be snug but not require extra force to close. If the door feels too tight, trim a small amount off the weatherstripping on the hinge side.
Step 4: Install the Door Sweep
The door sweep attaches to the interior bottom edge of the door and seals the gap between the door and the threshold.
Measure and position:
Close the door. Measure the width of the door at the bottom edge and cut the sweep to this length.
Hold the sweep against the door so the rubber or brush seal just touches the threshold when the door is closed. Mark the screw hole positions with a pencil.
Install:
Open the door. Pre-drill pilot holes if installing into a solid wood door (prevents splitting). Screw the sweep in place — start with the center screw to hold it in position, then add the end screws.
Close the door and check the seal: slide a piece of paper under the door. You should feel resistance when pulling it out. If it slides freely, the sweep needs to be positioned lower on the door.
Step 5: Test for Drafts
Close the door completely and repeat the hand test around the frame. You should feel no air movement. On a cold or windy day, the difference will be immediate and obvious.
If you still feel a draft in one spot, the weatherstripping may have a gap at a corner or may not be making full contact. Press it more firmly or add a small additional piece to cover any gaps.
How Long Does Weatherstripping Last?
| Type | Lifespan |
|---|---|
| Foam tape | 2–3 years |
| Rubber weatherstripping | 3–5 years |
| V-strip (metal) | 5–7 years |
| Door sweep (rubber) | 3–5 years |
| Door sweep (aluminum/rubber) | 7–10 years |
Check your exterior doors every fall before cold weather arrives. If you can see daylight around the edges when the door is closed, the weatherstripping needs replacement.
Other Places to Check for Drafts
While you’re at it, check these common air leak locations:
- Window frames: Caulk any gaps between the window frame and the wall with exterior caulk
- Electrical outlets on exterior walls: Install foam outlet gaskets behind the cover plates — takes 2 minutes per outlet
- Attic hatch: Add weatherstripping around the frame the same way you would a door
- Mail slot: If your door has one, add a brush seal to the interior
The Department of Energy estimates that sealing air leaks throughout a home can reduce energy bills by 10–20%. Weatherstripping the doors is the fastest and cheapest place to start.
Frequently Asked Questions
How do I know if my weatherstripping needs replacing? Three signs: you can feel a draft with the door closed, you can see daylight around the door frame, or the existing weatherstripping is visibly cracked, compressed flat, or missing in sections.
Can I weatherstrip a door without removing the old weatherstripping? No. Adding new weatherstripping over old won’t seal properly — the old compressed strip creates an uneven surface. Always remove the old material completely before installing new.
What’s the difference between weatherstripping and caulk? Weatherstripping seals moving parts — doors and windows that open and close. Caulk seals stationary gaps — where a window frame meets the wall, for example. Use weatherstripping where there’s movement and caulk where there isn’t.
My door still drafts after new weatherstripping — what else could cause it? Check the threshold (the piece on the floor under the door). If the threshold itself is worn or the door sweep isn’t reaching it, you’ll still get drafts even with new weatherstripping. Adjustable thresholds can be raised with a screwdriver to close the gap.
Does weatherstripping work for noise as well as drafts? Yes. A good weatherstripping seal reduces both air and sound transmission. If noise is your primary concern, look for weatherstripping specifically rated for acoustic sealing — it’s denser and provides better sound attenuation.
The Bottom Line
Weatherstripping a door is one of the highest-return, lowest-effort home improvements you can make. Twenty dollars in materials and an hour of your time stops drafts that cost you money every month for years.
Do it before cold weather hits. Check the door sweep while you’re there. Your energy bill will show the difference by the first full heating month.
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