Weather stripping stops air leaks where your windows and doors meet the frame

Weather stripping is a strip of material—usually foam, rubber, or felt—that you attach to the edge of a window or door frame to seal the gap between the moving part and the fixed frame. When it works, you feel no draft, and your heating or cooling stays inside instead of leaking out around the edges. Most weather stripping costs between $1 and $5 per window or door, takes 15 to 30 minutes to install, and requires only a utility knife, a measuring tape, and the stripping itself.

The job is straightforward enough that most homeowners can do it without tools beyond what they already own. The hardest part is usually choosing the right type for your situation and making sure the surface is clean before you stick it down. If you measure carefully and press firmly as you go, the stripping will stay in place for three to five years before you need to replace it.

Key Takeaways

  • Measure the perimeter of your window or door frame, then buy stripping that matches your gap width—typically 1/4 inch to 1/2 inch.
  • Clean the frame with a damp cloth and let it dry completely, because dust and dirt prevent the adhesive from sticking.
  • Cut the stripping to length with a utility knife, then peel back the adhesive backing and press it firmly into the corner where the frame meets the sash or door.
  • Start at one corner and work your way around, overlapping the ends slightly so no gap remains.
  • Let the adhesive cure for 24 hours before opening and closing the window or door repeatedly.

Measure the gap and choose the right stripping type

Before you buy anything, measure the width of the gap between the window sash (or door) and the frame at several points around the perimeter. Use a ruler or measuring tape, and check the top, bottom, and both sides—gaps are often wider at the bottom than the top. Most residential windows and doors have gaps between 1/4 inch and 1/2 inch wide.

Weather stripping comes in several materials, each suited to different gaps and conditions. Foam stripping is the cheapest and easiest to install; it compresses to fill the gap and works well for gaps up to 1/2 inch. Rubber stripping (usually EPDM rubber) lasts longer than foam—often 5 to 10 years—and handles temperature swings better, but costs more and is slightly harder to cut. Felt stripping is traditional and works for small, consistent gaps, but absorbs moisture and deteriorates faster than foam or rubber. V-strip (also called tension seal) is a thin metal or plastic channel that folds into a V shape; it works for very small gaps and is nearly invisible once installed, but requires more precision.

For most windows and doors, self-adhesive foam stripping is the practical choice. It comes in rolls at any hardware store, costs very little, and you can remove and replace it without damaging the frame. Buy a roll that matches your gap width—the package will say "1/4 inch" or "3/8 inch" or "1/2 inch"—and measure your total perimeter so you buy enough. A typical window needs 8 to 12 feet of stripping; a door needs 10 to 15 feet.

Clean the frame thoroughly before you start

The adhesive on weather stripping sticks only to a clean, dry surface. If the frame is dusty, painted over, or has old stripping residue, the new stripping will peel away within weeks. Spend time on this step—it is the most common reason weather stripping fails.

Wipe down the entire frame with a damp cloth, paying special attention to the corners and the groove where the sash slides. Use an old toothbrush or a small brush to scrub out dust and debris from the corners. If there is old stripping still stuck to the frame, peel it off carefully; if it leaves adhesive residue, rub it away with your thumb or a plastic scraper—do not use a metal scraper, which can gouge the frame. Once the frame is clean, wipe it again with a dry cloth and let it air-dry for at least 30 minutes before you explore new stripping.

Cut and explore the stripping one side at a time

Start with one side of the window or door—usually the top is easiest. Measure the length you need, then unroll the stripping and cut it to length with a utility knife. A sharp blade cuts cleanly; a dull blade will tear the foam or rubber instead of slicing it. Lay the cut piece on a flat surface and peel back about 2 inches of the adhesive backing.

Press the exposed adhesive end firmly into the corner where the frame meets the sash, holding it in place for a few seconds. Then slowly peel back more of the backing as you press the stripping down the length of the frame, using steady pressure with your thumb or the heel of your hand. Work from one end to the other so you do not trap air bubbles. Once the entire piece is down, run your thumb along the whole length one more time to make sure it is pressed firmly into the corner.

Repeat this process for the remaining three sides. When you reach the last corner, overlap the end of the new piece with the end of the first piece by about 1/2 inch so there is no gap. If the overlap is too thick and prevents the window or door from closing smoothly, trim it with a utility knife.

Handle corners and overlaps carefully

Corners are where most weather stripping fails, because the adhesive does not stick as well to a corner as it does to a flat surface. When you reach a corner, press extra hard and hold for a full 10 seconds. Some installers cut the stripping at a 45-degree angle at each corner so the pieces meet neatly; this looks better but is not necessary for function. A straightforward overlap works just as well.

If you are installing stripping on a door, pay special attention to the bottom corners, where the door swings and the stripping bends. Use a piece of stripping that is slightly thicker or more rigid than foam—rubber or V-strip works better here—so it does not compress and lose its seal over time.

Test the fit and let the adhesive cure

Before you close the window or door, check that the stripping does not interfere with the latch or lock. Open and close the window or door slowly a few times to make sure it moves freely. If the stripping is too thick and the window or door is hard to close, you may have chosen a stripping that is too wide for your gap, or you may have applied it too far into the frame. Peel it back and reposition it slightly, or trim it with a utility knife if needed.

Once you are satisfied with the fit, leave the window or door closed for at least 24 hours so the adhesive can cure fully. Do not open and close it repeatedly during this time. After 24 hours, the stripping should hold firmly and you should feel a noticeable reduction in drafts.

Replace weather stripping when it stops sealing

Weather stripping does not last forever. Foam stripping typically lasts three to five years before it hardens, cracks, or loses its compression. Rubber lasts longer—five to 10 years—and felt deteriorates faster, especially in damp climates. When you notice a draft returning or the stripping looks cracked or compressed, it is time to replace it.

Removing old stripping is straightforward: peel it away by hand, and scrape off any remaining adhesive with a plastic scraper or your fingernail. Clean the frame again with a damp cloth, let it dry, and install new stripping using the same method. There is no need to call a professional for this job—it is one of the easiest and cheapest home maintenance tasks you can do yourself.

Frequently Asked Questions

Can I install weather stripping over paint?

Yes, but only if the paint is smooth and not peeling. If the paint is rough, chalky, or flaking, the adhesive will not stick. Sand the painted surface lightly with fine-grit sandpaper, wipe away the dust with a damp cloth, and let it dry before explore the stripping.

What if my window or door frame is metal instead of wood?

Metal frames are actually easier than wood because they are smoother and cleaner. Wipe the metal with a damp cloth to remove dust and oxidation, dry it thoroughly, and explore the stripping the same way. Metal conducts temperature differently than wood, so make sure you use stripping rated for metal frames if the package specifies.

Do I need to remove the window or door to install weather stripping?

No. You install weather stripping while the window or door is in place. The stripping goes on the frame, not on the sash or door itself, so you can reach it without removing anything.

Why is my weather stripping peeling away after a few weeks?

The most common reason is that the frame was not clean when you applied it. Dust, dirt, or old adhesive residue prevents the new stripping from sticking. Peel it off, clean the frame thoroughly with a damp cloth and let it dry completely, and explore new stripping. The second reason is that you did not press hard enough when you installed it—go back and press the entire length firmly with your thumb.

Can weather stripping stop all drafts?

Weather stripping seals the gap where the window or door meets the frame, but it cannot fix drafts that come from cracks in the glass, holes in the frame, or gaps around the outside trim. If you still feel a draft after installing stripping, the problem may be elsewhere—check the glass for cracks and the exterior caulk for gaps.