How to Replace a Door Threshold Extension
Step 1 - Check for Clearance
Check any clearance for things like the door trim and the door stop. You may have to remove these things until you are done with the job. Next, open the door as far as you can. After you have done that, use a pry bar and a wedge to pry off the trim without causing any structural damage to the doorway.
Step 2 - Remove the Old Threshold
If you have a circular saw or a chisel, use it to remove the threshold extension from the doorway altogether. Be careful not to damage any part of the floor or other trimming.
Step 3 - Measure and Cut
Measure the wooden threshold to the exact size that you need for it to be, and then cut it with a saw. It needs to fit snugly in position for the door to open and close properly. Notch the new threshold so that it fits very securely where the door stops are.
Step 4 - Clean Up Old Debris
Clean up any debris left behind from the removal of the old threshold. Residual debris will damage the new threshold extension that you are trying to install.
Step 4 - Install the Door Threshold
Distribute a layer of caulk on the bottom where the threshold will be installed. This will ensure that there are no gaps between the floor and its threshold. Gently install the threshold by tapping it with your hammer.
Drill a few pilot holes that are a little smaller than the finishing nails you will need to use to secure the threshold. Countersink your nails with a nail set. Put the wood dough where the nails are. Let dry and once dried sand lightly with sandpaper.
Step 5 - Finishing Touches
If you are using a stain and/or water repellent, apply it once the threshold has dried and been sanded.