How to Install Garage Door Thresholds

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Garage doors commonly use bottom seals on the door to keep water from coming into the garage when it rains. However even the nest bottom door seal allows water through when it rains hard, or if the floor under the door is not perfectly flat. Garage door thresholds resolve this problem. The thresholds look similar to a rubber speed bump and attach to the garage floor. Garage door thresholds are available at home improvement centers as well as garage door dealers.

Things You'll Need

  • Stiff wire brush
  • Broom
  • Tape measure
  • Utility knife
  • Pencil
  • Construction adhesive
  • Caulking gun
  • Open the garage door with the door opener, or manually. Clean the floor directly under the path of the door with a wire brush. Sweep the area clean. The garage door threshold uses adhesive and the floor must be clean for a solid application.

  • Measure the distance between the door tracks with a tape measure. Unroll the garage door threshold and transfer the measurement to the threshold. Cut the threshold to size with a utility knife. For best cutting results, ensure you have a sharp blade in your knife.

  • Position the threshold on the floor directly under the path of the garage door. The "hump" side of the threshold should point toward the rear of the garage, with the concave side pointing toward the outside of the garage.

  • Close the garage door over the threshold. Push the hump of the threshold against the garage door from inside. Trace the outer edge of the threshold onto the floor with a pencil. Open the garage door and remove the threshold.

  • Turn the threshold upside down so that the bottom is facing you. Apply several beads of construction adhesive to the bottom of the threshold with a caulking gun. For ideal results, place two beads down the length of the bottom and place a third bead between the first two.

  • Position the threshold next to the line on the garage floor. Flip the threshold over and line up the outer edge with the trace line. Firmly press the threshold into position.

  • Close the garage door over the threshold and allow the adhesive to dry according to the directions on the tube--generally 6 hours.

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