How to Add Weatherstripping to Exterior Doors

Installing weatherstripping around exterior doors involves measuring the door frame, cutting the appropriate material to size, and securing it to create an airtight seal that blocks drafts and improves energy efficiency.

1. Clear and Clean the Frame. Pull off any existing weatherstripping by hand or use a putty knife to scrape away stubborn adhesive residue. Clean the door frame thoroughly with a damp cloth to remove dirt, debris, and any remaining adhesive. Let the surface dry completely before proceeding.
2. Get Exact Measurements. Measure the top of the door frame and both side jambs from top to bottom. Write down these measurements and add an extra inch to each measurement to ensure you have enough material. Most exterior doors need three pieces: one for the top and one for each side.
3. Pick Your Strip Type. Select compression weatherstripping for the top and hinge side of the door, as these areas need to compress when the door closes. For the latch side where the door meets the strike plate, use door sweep weatherstripping or a combination of compression strips and a door sweep at the bottom.
4. Cut Strips to Length. Using sharp scissors or a utility knife, cut each piece of weatherstripping according to your measurements. For foam or rubber strips, cut slightly longer than needed so you can trim to exact size during installation. Make clean, straight cuts to ensure proper sealing.
5. Seal the Top First. Starting with the top piece, remove the backing paper if using adhesive strips, or position nail-on strips against the door stop. Press firmly along the entire length, ensuring the weatherstripping makes contact with the door when closed but doesn't prevent the door from shutting completely.
6. Secure Both Side Strips. Attach the hinge-side weatherstripping first, starting at the top and working down. Butt the top edge against the header strip you just installed. For the latch side, position the weatherstripping so it contacts the door face when closed but doesn't interfere with the locking mechanism.
7. Attach Bottom Door Sweep. Measure and cut a door sweep to fit the width of your door. Position it on the bottom rail of the door so the flexible seal touches the threshold when the door is closed. Mark screw holes, drill pilot holes, and secure with the provided screws.
8. Verify the Seal Works. Close and open the door several times to ensure it operates smoothly without binding. Check that the weatherstripping makes contact all around the frame when closed. On a windy day or using a hair dryer, test for air leaks and adjust the positioning if needed.