How to Replace Door Weather Stripping: Easy DIY Guide
Replacing door weather stripping takes about 30 minutes, costs $10 to $30 in materials, and needs only a screwdriver, a utility knife, and a tape measure. On most exterior doors made since the 1980s, the old strip pulls out of a groove (the "kerf") in the door frame by hand, and the new one presses in. The bottom seal, called a door sweep, is a separate piece that slides or screws onto the bottom of the door and can be replaced without taking the door off its hinges.
You'll know it's time when you can see daylight around a closed door, feel a draft, or slide a dollar bill under or beside the door and pull it out without resistance. A worn seal is one of the cheapest energy fixes in the house: sealing air leaks around doors and windows can cut heating and cooling costs by up to 10 percent, according to ENERGY STAR.
Is it easy to replace weather stripping on a door?
Yes. It's one of the easiest home repairs there is, on the level of changing a light fixture or hanging a shelf: no special tools, no removing the door, and no way to make a mistake you can't undo by pulling the strip back out and trying again. Plan on 30 minutes for the sides and top, and another 15 for the bottom sweep. The only judgment call is buying the right type of strip, which the next section covers.
Which type of weather stripping do I need?
Match what's already on the door. Look at the frame with the door open: if there's a thin groove running along the stop (the strip the door closes against) with a fin of rubber or foam pressed into it, you have kerf-style weather stripping, which is most exterior doors built since the 1980s. If the old strip is nailed or stapled to the frame, or stuck on with adhesive, you have a surface-mount type.
Kerf-in (press-in) weather stripping
Fits: any door frame with a groove (kerf) in the stop.
Cost: $10–$20 for a kit that does one door.
Life: 5–10 years. The easiest to replace and the best seal. Bring a 2-inch piece of the old strip to the store to match the fin shape; "universal" kerf strips fit most, but a matched one seals better.
Foam tape
Fits: any flat surface on the stop; use it only if there's no kerf.
Cost: $5–$10 a roll.
Life: 1–3 years. Peel and stick. The cheapest and fastest, and the first to wear out.
V-strip (tension seal)
Fits: the sides and top of the door jamb, in the gap between the door and the frame.
Cost: $10–$15.
Life: 5+ years. A folded strip of vinyl or metal that springs against the door. Good for older doors with uneven gaps; fussier to install.
Door sweep (bottom seal)
Fits: the bottom edge of the door.
Cost: $10–$25.
Life: 3–5 years. Either a screw-on aluminum strip with a rubber or brush edge, or a U-shaped slide-on seal. Match the old one: measure the door's width and thickness, and note whether it screwed on or slid on.
Chattanooga note: many pre-1980 homes here have solid wood jambs with no kerf. If that's your door, a surface-mount V-strip or a nail-on rubber strip is the right choice, and it's worth asking an EPB Energy Pro to look at the door during a free home energy audit, since older jambs often need the stop re-set as well.
What tools and materials do I need?
- New weather stripping (kerf-in, foam, or V-strip) for the sides and top
- A new door sweep, if the bottom seal is worn
- Screwdriver (for the sweep and any nailed strip)
- Utility knife or heavy scissors
- Tape measure
- A rag and mild cleaner for the groove
- Optional: pliers for pulling stubborn nails or staples; wood filler for old nail holes
How do you replace the weather stripping on the sides and top of a door?
Pull the old strip out, clean the groove, measure, cut, and press the new strip in, top first. Follow these five steps:
- Remove the old strip. For kerf-style, grab one end and pull; it comes out of the groove in one piece. For nailed or stapled strips, pry the fasteners out with a screwdriver or pliers. For foam tape, peel it and scrape the adhesive residue with the knife.
- Clean the groove or stop. Wipe out dust and old adhesive so the new strip seats fully.
- Measure the top, then each side. Measure the top piece from the inside edge of one side stop to the other; measure the sides from the top stop down to the threshold. Write the numbers down; don't trust the old strip's length, which may have shrunk.
- Cut the new strip. Cut the top piece first, square. Cut the side pieces about 1/8 inch long so they compress into a tight corner, and trim if they buckle.
- Press the strip in. Start at a corner and push the fin into the kerf with your thumb every few inches, working to the other end. For V-strip, nail or stick the spine to the jamb with the open side of the V facing the door. For foam, peel the backing a foot at a time and press firmly.
Close the door and check the seal from inside with the lights off. Any daylight means the strip isn't seated or the gap is uneven; press it in again or, for V-strip, bend the V open a little more.
How do you replace the bottom door seal without removing the door?
Most door sweeps come off and go on with the door in place. Open the door wide and look at its bottom edge.
Screw-on sweep: (a metal or vinyl strip with visible screws on the inside face of the door): remove the screws, pull the old sweep off, hold the new one against the door with its edge just touching the threshold when closed, mark the holes, and screw it on. Trim the sweep to the door's width first with a hacksaw or tin snips.
Slide-on (U-shaped) sweep (no screws; the seal wraps under the door): open the door, grip the seal at the hinge end and slide it off along the bottom edge. If it's stuck, a flat pry bar behind the end will start it. Slide the new one on from the same end; a little dish soap on the door edge helps. You may need to loosen the hinge-side edge slightly to clear the door stop.
Threshold-side seal (the rubber bulb sits on the threshold, not the door): pry the old bulb out of its channel and press the new one in.
If the gap under the door is more than 3/4 inch, a sweep alone won't close it; add a door bottom shoe or adjust the threshold, which most exterior thresholds allow with the screws along their length.
How do you know when door weather stripping needs replacing?
Replace it when it's cracked, flattened, torn, or missing sections, or when the dollar-bill test fails: close the door on a bill and pull. If it slides out easily, the seal isn't working there. Other signs are a draft you can feel with the back of your hand, dust or insects along the threshold, and higher winter bills than the year before with no change in use. Kerf-style strips typically last 5 to 10 years; foam tape often needs replacing every year or two.
How much does it cost to replace door weather stripping?
Do it yourself for $10 to $30 per door in materials. A handyman or door company typically charges $75 to $200 per door, more if the threshold or stop needs adjusting. For a single door with a kerf, there's no reason to pay for it.
If you'd rather have someone look at the whole house, EPB customers can get a free home energy check from the EPB Energy Pros, who will find the leaks around doors, windows, and attic hatches and tell you which are worth fixing. Qualifying homeowners can get air sealing and insulation done at no cost through Home Uplift.
How much energy does new weather stripping save?
Sealing air leaks around doors and windows can cut heating and cooling costs by up to 10 percent, according to ENERGY STAR, and doors are usually the largest single leak in a home. On a $150 winter power bill, that's $10 to $20 a month, so a $20 strip pays for itself the first cold month. It also matters when the power is out: a sealed door is what lets one room hold its heat. See how to heat a room without electricity.
Frequently asked questions
Can I replace a door seal myself?
Yes. It takes about 30 minutes, costs $10 to $30, and needs a screwdriver, a utility knife, and a tape measure. The steps above cover the sides, top, and bottom.
How do I remove old weather stripping from the bottom of a door?
If the sweep has screws on the inside face, remove them and pull it off. If it wraps under the door with no screws, open the door and slide it off toward the hinge side; a flat pry bar behind one end will get it started.
Does weather stripping go on the door or the frame?
Both. The sides and top seal against the frame (the door stop), and the bottom seal (sweep) attaches to the door itself. On a kerf-style frame, the strip sits in a groove in the stop, not on the door.
Can I use weather stripping on a garage or patio door?
Yes. Sliding patio doors use a fuzzy pile strip in a channel; garage doors use a rubber bottom seal in an aluminum track plus vinyl stop molding around the sides. Both replace the same way (pull the old one out, slide the new one in), but buy the parts made for that door type.
What's the best weather stripping for an exterior door?
Kerf-in rubber or silicone, if the frame has a groove; it seals best and lasts longest. V-strip for older wood jambs without a kerf. Foam tape only as a short-term fix.
