Project Guide

How To Remove and Replace a Threshold

1
Remove the Old Exterior Threshold
A pry bar inserted under an old wood threshold.

Begin by removing the existing threshold from your door.

 

  • Cut the old threshold with a back saw or a reciprocating saw. To cut a metal threshold, use tin snips and a saw equipped with a metal-cutting blade to make the cuts. Be careful not to accidentally saw into your flooring. 
  • Dislodge the threshold pieces with a pry bar.  
  • Remove any weather stripping or caulk that was attached to the threshold. 
  • Clean the area thoroughly. 
2
Prepare the New Exterior Threshold
A person measuring the width of a door from jamb to jamb.
  • Carefully measure the doorway for the new threshold. Measure between the outside edges of the door casing. 
  • The new threshold should have a similar profile to your old threshold and be 1- to 2-inches longer than the length of the doorway so that you can cut it for an exact fit. 
  • Mark the new threshold based on your measurements.  
  • The threshold will have to have notches on each side to fit around the door jambs. Use a carpenter’s square to mark perfect right angles for these notches. 
  • Cut the new threshold to fit using a jigsaw or circular saw. Adjust and perfect the cuts with a handsaw if necessary. 
3
Secure the Exterior Threshold
A person screws in a new exterior threshold.
  • Test the fit. If it prevents the door from closing comfortably, you can plane down the door or lower the threshold.  
  • Lay a bead of caulk along what will be the back edge of the threshold.  
  • Slide the threshold underneath the doorstops and position the notches you cut around the door jambs. Tap it snugly into position using a rubber mallet.  
  • The threshold should slope slightly away from your home so that water will not pool at your doorway. 
  • If your new threshold requires screws, insert the screws in the pre-made holes along the length of the threshold. Use a power drill to screw the threshold into position. 
  • If your new threshold does not require screws or you are installing it onto concrete slab, secure it with construction adhesive that is approved for use with both the threshold material and the floor surface material. 
  • Run a bead of caulk between the threshold and each doorstop.  
4
Replacing an Interior Threshold
An interior threshold between a tiled room and a room with wood floors.

Interior thresholds or transition strips cover floorboard edges that end at a door. They serve as a transition element from one flooring material to another. Most thresholds are wood, though you also can buy plastic, marble or solid-surface versions similar to solid-surface countertops. No matter the material, interior thresholds are both decorative and functional as they smooth the way from room to room.  

5
Remove the Old Interior Threshold
A person lifting up an old interior threshold.
  • If the doorstops are undercut but the jambs are not, use a hammer and prybar to remove the nails from the threshold.  
  • Hammer the threshold out from under the doorstops. 
  • If the doorjambs were undercut to accommodate the threshold, saw the threshold into two pieces.  
  • Remove each piece separately. 


Tip: Use a wet tile saw to cut tile or marble thresholds. 

6
Prepare the New Interior Threshold
A person measuring a doorway opening.
  • Carefully measure the doorway for the new threshold, as you would for an exterior threshold, detailed in Step 2. 
  • Mark the new threshold based on your measurements.  
  • If necessary, undercut the doorstops and door jambs to fit the threshold. For some interior threshold materials, it may be easier to undercut the door jambs than to cut notches into the threshold.  
  • Cut the threshold to length. 
7
Secure the New Interior Threshold
Someone hammering an interior threshold into place.

To install a wood threshold onto wood or carpeted floors: 

  • Pre-drill pilot holes into the threshold.  
  • Position the threshold underneath the doorstops. Use a rubber mallet to tap it snugly into place if needed. 
  • Nail the threshold to the floor with flooring nails.  
  • Alternatively, countersink the threshold and fasten it with countersunk wood screws. 


To install a tile, marble or solid-surface threshold or to install any material threshold onto tile or masonry floors:  

  • Use adhesive to secure the threshold. 
  • Make sure the adhesive you choose is approved for use with both the threshold material and the floor material.  
  • Contact cement creates a strong, durable bond, but it won’t allow you reposition the threshold after you set it and apply pressure. Other types of adhesives will allow you to adjust the threshold slightly once placed. 

Knowing how to remove and replace a threshold is important for keeping your exterior doors weatherproof and for whenever you need to install and transition new flooring inside your home. Ready to get the supplies you need to install a door threshold? The Home Depot delivers online orders when and where you need them.