How to Seal Your Garage Door Against Rodents

Garages act as the primary highway for rodents entering your home, especially as the seasons change and temperatures drop. Even a tiny gap at the base of your door—no larger than the width of a pencil—provides enough space for a mouse to squeeze its entire body through. Blocking these entry points is the most effective way to secure your space without relying on messy traps or poisons. Done well, this project closes the physical perimeter entirely, leaving zero light or air visible under the door when closed. It requires attention to detail, particularly at the corners where the floor meets the door jamb, but it provides immediate peace of mind. A sealed garage is a protected garage, keeping both your tools and your living area safe from unwanted visitors.

  1. Find Every Light Leak. Close the garage door and look for light bleeding through the bottom and sides. Run your hand along the rubber sweep to check for cracks, chew marks, or hardened, brittle sections.
  2. Strip Out the Old Guard. Slide the old rubber weatherstripping out from the metal track at the bottom of the door. If it is stubborn, use a flathead screwdriver to pry up the end of the track slightly, then pull the rubber out in one piece.
  3. Lock In the New Barrier. Measure the width of your door and cut the new rodent-resistant seal to length with heavy-duty shears. Slide the new seal into the tracks, working from one side to the other, ensuring it sits flat against the floor.
  4. Create the Final Seal. Clean the concrete floor thoroughly, then apply a heavy-duty construction adhesive in a zigzag pattern where the door meets the ground. Press the rubber or aluminum threshold plate firmly into the adhesive and lower the door onto it to ensure a tight seal while it cures.
  5. Block the Corner Escape. Rodents often enter through the small triangular gaps at the bottom corners of the door frame. Fill these gaps with steel wool—which rodents cannot chew through—and pack it tightly with a putty knife.
  6. Fortify the Flanks. Inspect the vertical metal tracks on the sides of your garage door. If there is a gap between the door and the wall, install brush-style weatherstripping along the track to block the path.