Door threshold repair is fairly easy to do for the average homeowner. Begin by removing the existing threshold by unscrewing it or prying out the nails. You may need to trim parts of the new threshold to fit under door moldings. Put a heavy bead of silicone caulking under the new threshold and fasten it securely. You will want to go ahead and replace the sweep on the bottom of the door for a
. tight seal on the new threshold. More information can be found at this site http://www.associatedcontent.com/article/17447/how_to_repair_a_door_threshold.html.
