How to Replace a Threshold for French Doors

Lead Image
  • 3-4 hours
  • Beginner
  • 100-150
What You'll Need
Replacement threshold

Replacing a door threshold can be a complicated business, but this can be made even more complicated when the threshold in question supports French doors. French doors are those which resemble large hinged shutters, and can be folded open during summer, and then pulled tightly closed in colder weather. They are generally installed during home improvement, rather than fitted in the house originally, so you may have to work around this fact when you come to remove the threshold.Taking the threshold from a pair of french doors can seem daunting, but with a few simple rules, you can complete this task in a matter of hours.

Step 1 - Removing the Door

Before you begin to do any work on the threshold itself, you will have to remove the door which it holds. French doors can be unscrewed in sections, undoing the hinges and then removing the sliding wheels which allow the door to move backward and forward. If your doors are loosely fitted, you may also try to remove them as one from each side, but you will probably need assistance.

Step 2 - Removing the Threshold

Before you begin removing the threshold, clear it carefully by removing the hinges from it, and then checking for screws or nails that keep the threshold to the floor. You will also need to remove the lower wheel rail, which should be unscrewed carefully and then placed to one side. Cut out any screws or nails which lay around the door jamb using the saw. Placing your chisel under the wood of the threshold, wiggle so that it loosens enough to be slid out from under the door. If you have any trouble removing the threshold, check again for screws and nails. If you are still struggling to remove the door, cut the threshold into sections, and prise each piece up using the chisel.

Step 3 - Installing a New Threshold

Make sure that the new threshold is clean and smooth before installing. You can also buy oak thresholds ready-made which can be supplied polished and ready to fit in. Once your wood is ready, spread a thin layer of silicone adhesive along the bottom of the door area. Slide the threshold into the area you have just cleared of the old wood, and screw in using the screws supplied with the threshold kit. Make sure that you screw the board down very tightly, as this will prevent it from sagging or sliding.

Once you have screwed in all connections to your satisfaction, caulk the edges of the threshold particularly where it touches concrete or subfloor. If you use 100% silicone, this will also help to prevent water from getting under the door, and causing the threshold to rot. You can then add your slide rail back on to the top of the threshold, and caulk around the edge of this too. Fit the doors with the hinges on the inside, and give them 1 or 2 practice slides in order to ensure that everything is fully functional and the threshold is screwed in tightly.