Found on all four edges, a garage door seal is an important part of your garage door. It helps to keep out rain, snow, insects, and debris as well as cold and moisture. The types of garage door seals include bottom seals (weather seals), threshold seals (for the floor below the door), and brush seals (on commercial doors). If you see a cracked or buckled seal, or feel a draft from under the garage door, replace the seal as soon as possible.