There are a few ways that you can seal your exterior door threshold to keep out drafts, moisture, and pests. You can use weatherstripping, caulk, or a door sweep.
Weatherstripping is a strips of material that you attach to the door and the frame to create a seal. It’s usually made of foam or rubber and can be found at most hardware stores. Caulk is another way to seal gaps and cracks. It’s an easy way to fill in small spaces and doesn’t require any special tools or skills. A door sweep is a strip of metal or plastic that you attach to the bottom of the door. It has a brush or flap on the bottom that creates a seal against the floor when the door is closed.