1. Tighten the hinges on your door.
Some drafts can be caused by loose hinges, so before you seal the edges of your door, you should take a few minutes to tighten any hardware.
Lift the door by the doorknob. If you can move it upward, the the hinges are probably loose. Use a screwdriver to tighten the screws holding the hinges in place.
If the hinge screws spin but won't tighten, you will need to replace them. You may also need to fill the holes with wood plugs and re-drive the new screws into those plugs.
Similarly, if the doorknob itself moves when you lift it, you should tighten or replace it.
2. Check the old weatherstripping.
If your door had weatherstripping previously installed, it might be damaged or deformed. Check by running your hand around the perimeter of the door while the door is closed.
If you can feel a draft while checking the seal, you will need to remove the old weatherstripping and replace it with a new seal.
To remove old weatherstripping, simply peel or slide it away.
3. Clean the area.
Use a damp rag to wipe away any visible dirt and debris from the door frame and the edges of the door itself.
Drag the edge of a paint scraper along the top, bottom, and sides of the door and door frame to remove any stuck debris from these surfaces.
Check the threshold (the bottom of the door frame). If there are grooves along the threshold, run a large nail through the grooves to scrape away any gunk that has gotten itself lodged in there.
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