How to Replace a Rotted Threshold Over Concrete

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Things You'll Need

  • Screw gun

  • Pry bar

  • Tape measure

  • Pencil

  • Miter saw

  • Replacement threshold

  • Masonry bit

  • Drill

  • Package, plastic masonry anchors

  • Window and door caulk

  • Caulk gun

  • Package, masonry screws

Keep door thresholds in good condition to protect your home from damage.

A door threshold is located at the base of the door frame. The door sweep lightly rests against the threshold to create a sealed barrier at the bottom of your door. Even though you may not give it much thought, the door threshold prevents debris, insects and harsh weather from entering your home. Thresholds can become worn and rotted over time due to heavy foot traffic and weather exposure. Keeping a fresh coat of finish on your threshold will help maintain its integrity and installing a threshold over concrete requires a little extra preparation but is not difficult.


Step 1

Remove the screws from the old threshold with a screw gun. Slide a pry bar underneath the threshold and gently lift up while working your way along the entire edge. Pull the old threshold out of the door opening once you have pried it up.

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Step 2

Measure the length of the old threshold with a tape measure. Measure and mark the length of the old threshold onto the replacement with a pencil.

Step 3

Place the replacement threshold with the bottom side flat on the table of the miter saw. Slide the threshold over so that the outside edge of the blade lines up with the edge of the pencil mark. Pull the saw down in an even motion while squeezing the trigger to cut the threshold to length.


Step 4

Slide the replacement threshold into place in the door opening between the side door jambs. Drill through the threshold into the concrete with a masonry bit approximately every 8 to 10 inches. Drill to a depth in the concrete that matches the length of the anchors.

Step 5

Remove the threshold and slide the plastic anchors into the holes in the concrete. Apply a bead of window and door caulk along the base of the door opening between the side jambs using a caulk gun. Slide the replacement threshold back into place.


Step 6

Drive masonry screws through the holes in the threshold into the anchors in the concrete until the screws are slightly below the surface of the threshold.


Maintain the finish on your thresholds to prevent rotting.


Wear eye protection when replacing thresholds.


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