How to Weatherstrip a Door

Step 1: Remove the old weatherstripping
Start with the door open and work your way around the frame. Peel away adhesive-backed strips by hand or use a flathead screwdriver to pry up nailed or stapled pieces. Pull out any remaining staples with needle-nose pliers. Remove the door sweep from the bottom of the door by unscrewing it or prying it off.

Step 2: Clean all surfaces thoroughly
Use a clean rag and a mild cleaner to wipe down the door stop molding, the door frame, and the bottom edge of the door. Any dirt, old adhesive residue, or paint buildup will prevent new weatherstripping from bonding or seating properly. Let everything dry completely before moving on.

Step 3: Measure each section carefully
Measure the height of both side jambs and the width of the top jamb. Add a small amount to each measurement and trim to fit precisely - it is easier to trim down than to deal with a piece that is too short. For the door sweep, measure the full width of the door bottom.

Step 4: Install the side and top weatherstripping
For compression-style weatherstrip that nails onto the stop molding, close the door and position the strip so it presses lightly against the door face. Nail it in place, spacing nails according to the manufacturer's recommendation - typically every six to eight inches. For adhesive-backed V-strip or foam tape, peel the backing and press firmly into the channel between the stop and the jamb. Work from top to bottom on each side, keeping the strip straight.

Step 5: Install the door sweep
With the door closed, hold the door sweep against the bottom of the door so the flexible seal just touches the threshold. Mark the screw hole positions with a pencil, then open the door and drill pilot holes. Attach the sweep with the provided screws. Close the door to confirm the sweep makes even contact across the full width without dragging heavily enough to make the door hard to open.

Step 6: Test the seal
Close and latch the door, then move your hand around all four edges from inside. You should feel no airflow. A second test - hold a piece of paper against the frame and close the door on it. If you can pull the paper out easily, the seal in that spot needs tightening. Adjust the position of the weatherstrip or add a second layer where needed.

• Wear safety glasses when using a utility knife or prying tools to avoid debris near your eyes
• Work with the door propped open when needed so it does not swing and pinch your hands
• Use a stable step stool if reaching the top of a tall door frame - do not overreach from a ladder
• Keep utility knife blades sharp and always cut away from your body
• If the door frame shows signs of rot or water damage while you are working, stop and assess before continuing