How May A Threshold On An External Door Be Replaced?

When an exterior door’s threshold shows signs of rot or deterioration, it is essential to replace it. Rotten wooden casings and the riser may also need to be replaced. Measure the length, width, and thickness of the old threshold and have a replacement with a similar profile on hand. The new threshold should be an inch or two longer than the distance between the door casing’s outside edges so you can trim it for an exact fit later on. Remove the storm door and any weatherstripping.

There are two methods for replacing the threshold: one for metal or aluminum door sill and another for a wooden door sill. For the metal threshold, use a template to transfer the jamb’s contours to the ends of the threshold, where matching contours must be cut. Make templates from 1/4-in.-thick hardboard.

Expert DIY advice on how to replace a damaged exterior door threshold includes step-by-step directions, helpful illustrations, and videos. To remove the old threshold, follow these steps: 1) Know the parts that make up the exterior door threshold, 2) Prep with the replacement at the ready, 3) Remove the old threshold, 4) Pry out the template, and 5) Prepare the new threshold by scribing the template, butting it against the face of the jamb, spreading the scribes to make up the widest distance, and using a cut off tool or hacksaw to remove the length from each side of the threshold base and adjustable part.

Slide the threshold underneath the doorstops and position the notches to ensure a secure fit.