That cold breeze you feel around your front door on a January evening is costing you money every hour. Learning how to weatherstrip a door is one of the fastest, cheapest home improvements you can make, often taking less than an hour and costing under $30 in materials. The Department of Energy estimates that air leaks around doors and windows account for 25% to 30% of heating and cooling energy use in a typical home.
Part of our Windows & Doors guide — explore the full guide →
Signs Your Door Needs New Weatherstripping
Hold a lit incense stick or thin piece of tissue paper near the edges of a closed exterior door on a windy day. If the smoke drifts sharply or the tissue flutters, air is getting through. Visible daylight around the door edges is an obvious indicator. Compressed, cracked, or peeling weatherstripping has lost its ability to seal and needs replacement regardless of what the draft test shows.
Interior doors between conditioned and unconditioned spaces, like the door from your house to the garage, benefit from weatherstripping too. That garage door is often the biggest thermal weak point in the building envelope.
Types of Door Weatherstripping
Adhesive-Backed Foam Tape
Closed-cell foam tape is the easiest type to install. Peel the backing, press it onto the door stop, and you are done. It compresses when the door closes and springs back when the door opens. The downside is durability. Foam tape lasts 1 to 3 years before it compresses permanently and stops sealing. It costs $3 to $8 per roll.
V-Strip (Tension Seal)
V-strip is a thin plastic or metal strip folded into a V shape. It mounts inside the door jamb channel and uses spring tension to seal against the door edge. V-strip is more durable than foam tape, lasting 3 to 5 years, and provides a cleaner look because it is mostly hidden when the door is closed. A complete door kit runs $5 to $12.
Tubular Rubber or Silicone
This type features a hollow or foam-filled tube attached to a metal or plastic mounting flange. The flange nails or screws to the door stop, and the tube compresses against the door face. It seals well, handles irregular gaps, and lasts 5 to 10 years. Expect to pay $8 to $20 for a door set.
Door Sweeps and Bottoms
The threshold area is the hardest to seal because the door must still open and close freely. A surface-mounted door sweep screws to the interior face of the door bottom and features a flexible fin or brush that contacts the threshold. An under-door bottom, also called a door shoe, wraps around the bottom edge and provides a more finished appearance. Prices range from $8 to $25.
Tools and Materials Needed
- Tape measure
- Utility knife or scissors
- Screwdriver or cordless drill
- Small pry bar (for removing old weatherstripping)
- Rubbing alcohol and a rag (for surface prep)
- Weatherstripping material of your choice
- Door sweep or bottom seal
Step-by-Step Installation
Start by removing the old weatherstripping completely. Scrape off any adhesive residue with a putty knife and wipe the surfaces clean with rubbing alcohol. A dirty or oily surface prevents adhesive-backed products from sticking properly.
Measure each side of the door frame separately. Cut your weatherstripping to length with scissors or a utility knife. For adhesive-backed products, start at the top and press the strip into the corner where the door stop meets the jamb. Work down each side, keeping the strip straight and avoiding stretching it.
For nail-on or screw-on types, position the weatherstripping so the sealing surface contacts the door face when closed but does not interfere with operation. Close the door and check the seal before driving all the fasteners. If the door becomes hard to close, the weatherstripping is too tight and needs repositioning.
Install the door sweep last. Close the door and mark where the bottom meets the threshold. Attach the sweep so the flexible fin just touches the threshold surface without dragging. If the sweep drags, it will wear out quickly and make the door difficult to open over carpet or rugs.
Weatherstripping the Door Threshold
If your existing threshold is worn flat or dented, replacing it is more effective than adding weatherstripping around it. Aluminum thresholds with a vinyl insert cost $15 to $40 and create a positive seal against the door bottom. Adjustable thresholds let you raise or lower the seal height with screws, which is valuable for doors that swell seasonally or sit on uneven floors.
Remove the old threshold by backing out the screws and prying it up. Clean the subfloor, apply a bead of silicone caulk, set the new threshold, and screw it down. Adjust the height so the door bottom compresses the vinyl insert about 1/8 inch when closed.
Pro Tips for a Long-Lasting Seal
Choose the right compression. Weatherstripping should compress about one-third to one-half of its thickness when the door is closed. Too little compression and air leaks through. Too much compression and the door will not latch properly or will spring open.
Upgrade from foam tape to tubular rubber if you live in a climate with temperature extremes. Foam tape fails faster when it cycles between compressed and expanded states hundreds of times a day in a busy household. Tubular rubber handles the repetition far better.
Check your door alignment before blaming the weatherstripping. A door that sags at the latch side, usually due to loose hinge screws, creates an uneven gap that no weatherstrip can fully seal. Tighten or replace the hinge screws first. Driving a 3-inch screw through the top hinge into the framing stud is often all it takes to pull a sagging door back into alignment.
Maintenance Schedule
Inspect your door weatherstripping every fall before heating season starts. Press a dollar bill between the door and frame, close the door, and try to pull the bill out. If it slides freely, the seal at that point is not making good contact. Repeat this test at the top, both sides, and the bottom.
Plan to replace adhesive foam tape every 1 to 2 years, V-strip every 3 to 5 years, and tubular rubber every 5 to 8 years. Door sweeps with vinyl or rubber fins typically last 2 to 4 years depending on traffic volume. Keeping fresh weatherstripping on all your exterior doors is one of the highest-return maintenance tasks in any home.
