Sealing your garage door for the winter involves buying a specially designed strip and attaching it to a garage floor. This will keep the wind, rain and snow from blowing underneath your garage door, and keep the inside as dry as possible. If your garage door has sections with visible space between them, install strips of plastic in between the sections for maximum protection from the elements.

Choose a Product Fitting Your Circumstances

Some types of garage door seals may not be usable if it is already winter and the surface of your garage floor is wet. In this case, drill an aluminum seal into the concrete, regardless of the weather, without the use of caulking. The caulking used to attach the plastic or rubber strip to your garage floor requires a dry surface. To prepare the surface for these types of garage door seals, wash your garage floor, then wait for it to dry completely.

Installation Considerations for Rubber or Plastic Seals

To prepare for installation, unroll the garage door seal and ensure it is the correct length, adjusting it as needed with metal shears. Follow the manufacturer's instructions to apply caulk to the garage floor where the seal will attach; this is normally where the garage door would close. Drawing lines on the concrete will help you to apply the right amount of caulking without wasting it. Next, roll the seal onto the caulking and press it down using your hands; close the garage door. Wipe away any excess caulking with a cloth. Let your new garage door seal dry for at least 24 hours with the garage door closed on top of it. You may drive over the seal after this.

Consider Using Section Sealing Strips

In addition to sealing the area between the floor and the bottom of your garage door, add strips of clear plastic to the small spaces between your garage door sections if those are an issue. The strips are yet another way to seal your garage door and keep out the cold, wind, rain and dust.

Source:

Prodoorparts.com: Is Your Garage Prepared for the Winter?