How To Replace The Rubber Seal On Door Threshold

If you’ve noticed a draft coming from under your door, it may be time to replace the rubber seal on your door threshold.

The rubber seal, also known as a door sweep, is a strip of rubber located at the bottom of your door that helps to seal the gap between the door and the threshold. Over time, this seal can become worn or damaged, allowing air and moisture to seep through.

Fortunately, replacing the rubber seal on your door threshold is a relatively simple task that can be done in just a few steps:

  1. Remove the old seal
  2. Clean the threshold in preparation for the new seal
  3. Measure your threshold
  4. Purchase a new seal
  5. Install

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Why Replace a Rubber Seal on a Door Threshold?

If the rubber seal on your door threshold is damaged or worn, it can allow air and moisture to seep into your home, which can lead to higher energy bills and potential damage to your floors and walls.

Replacing the rubber seal can help improve the energy efficiency of your home and stop water from coming under your door.

Additionally, if the door threshold is damaged or warped, it can create gaps in the seal, even with a new rubber strip. It may be necessary to replace both the rubber seal and the threshold to ensure a proper seal.

Overall, replacing the rubber seal on your door threshold is a simple and cost-effective way to improve the energy efficiency of your home and prevent damage from moisture.

What is a Rubber Seal?

A rubber seal is a strip of rubber that is installed on the bottom of a door. Its purpose is to create a seal between the door and the floor, preventing air and moisture from entering the room. Over time, the rubber can become worn, cracked, or damaged, which can reduce its effectiveness.

What is a Door Threshold?

A door threshold is a strip of wood or metal that is installed at the bottom of a door frame. Its purpose is to provide a smooth transition between the floor and the door, as well as to create a seal with the rubber strip. The threshold can become damaged or warped over time, which can also reduce the effectiveness of the rubber seal. You have a threshold on exterior doors and interior doors.

Removing the Old Rubber Seal

Before you can replace the rubber seal on your door threshold, you’ll need to remove the old one. This process can be broken down into two sub-sections:

Tools Needed

Here are the tools you will need to remove the old rubber seal:

  • Utility knife
  • Flathead screwdriver
  • Needle-nose pliers (optional)

Removing the Old Seal

Follow these steps to remove the old rubber seal:

  1. Use a utility knife to cut the rubber seal along the length of the threshold. Be careful not to damage the threshold itself.
  2. Use a flathead screwdriver to pry the old seal out of the channel. If the seal is stubborn, you can use needle-nose pliers to grip it and pull it out.
  3. If the old threshold is damaged or worn, this is a good time to replace it as well. Check that the new threshold fits properly before continuing.
  4. If the new rubber seal doesn’t fit snugly into the grooves or channel, use a shim to adjust the fit until it’s tight.

With the old rubber seal removed, you’re ready to move on to the next step in replacing your door threshold.

Preparing the Door Threshold for the New Rubber Seal

Before you install the new rubber seal on your door threshold, you need to prepare the surface properly. This will ensure the new seal will adhere properly and provide an airtight seal to keep out drafts, air, and weather.

Cleaning the Threshold

The first step is to clean the threshold thoroughly. Use a stiff-bristled brush to remove any dirt, debris, or old adhesive from the surface. If there is any old weatherstripping or sweep, remove it carefully with a scraper or putty knife.

Use a mild detergent and warm water to clean the surface, and then dry it completely with a clean cloth. Make sure there is no dirt, dust, or debris left on the threshold before proceeding.

Checking for Gaps and Damage

Inspect the threshold for any gaps or damage (also check the threshold itself is sealed to the concrete or base below). If there are any gaps, use a suitable filler to fill them in. If there is any damage, repair it before installing the new rubber seal. You can use a putty knife and wood filler to fill in any gaps or holes. Sand the surface lightly to make it smooth and even before proceeding.

Installation of New Rubber Seal

Now you are ready to install the new rubber seal. Measure the length of the threshold and cut the rubber seal to the correct length. Peel off the backing from the adhesive side of the rubber seal and carefully press it onto the threshold.

Make sure it is aligned correctly and there are no wrinkles or bubbles in the rubber seal. Press it firmly onto the threshold to ensure a good bond. If there is any excess rubber seal, trim it carefully with a utility knife.

By following these steps, you can prepare your door threshold for a new rubber seal. This will help ensure a proper seal and prevent drafts, air, and weather from entering your home.

Installing the New Rubber Seal

Fitting the Rubber Seal

Before you start fitting the new rubber seal, make sure that the door threshold is clean and dry. Remove any debris or old adhesive using a scraper or a putty knife.

Next, measure the length of the door threshold and cut the new rubber seal to the appropriate length using a utility knife or a pair of scissors. Make sure that the rubber seal fits snugly against the door threshold without any gaps or overlaps.

Once you have cut the rubber seal to the correct length, position it onto the door threshold. Use a rubber mallet or a hammer with a soft cloth to gently tap the rubber seal into place. Ensure that the rubber seal is flush against the threshold and that it is straight.

Securing the Rubber Seal to the Door Threshold

After you have fitted the rubber seal, secure it to the door threshold using screws or adhesive. If you are using screws, make sure that they are spaced evenly and that they are not too close to the edge of the rubber seal. Use a drill to make pilot holes for the screws, then screw them in using a screwdriver.

If you are using adhesive, apply a small amount of adhesive to the underside of the rubber seal and press it firmly onto the door threshold. Make sure that the adhesive is evenly distributed and that there are no air pockets between the rubber seal and the threshold. Allow the adhesive to dry completely before using the door.

Finally, check the rubber seal to make sure that it is securely attached to the door threshold. Test the door to make sure that it opens and closes smoothly without any resistance. If necessary, make any adjustments to the rubber seal to ensure a proper fit.

Finishing Touches

After successfully replacing the rubber seal on your door threshold, it’s important to perform a few final checks to ensure everything is working correctly. This section will cover testing the door and trimming the rubber seal to ensure a perfect fit.

Testing the Door

Before fully installing the rubber seal, it’s important to test the door to ensure it opens and closes smoothly. Open and close the door several times to check for any resistance or sticking. If the door is not opening and closing smoothly, you may need to adjust the screws on the threshold to ensure a proper fit.

Trimming the Rubber Seal

Once you have tested the door and confirmed it is opening and closing smoothly, you can trim the rubber seal to ensure a perfect fit. Using a utility knife, carefully cut the rubber seal to the appropriate length. Be sure to leave a slight overlap at the corners to ensure a tight seal.

If the rubber seal is too long, it may cause the door to stick or not close properly. If it is too short, it may not provide a proper seal and could let in drafts or moisture.

After trimming the rubber seal, use a screwdriver to reattach any screws that were removed during the installation process. Make sure they are tightened securely to ensure the rubber seal stays in place.

By following these simple steps, you can ensure that your new rubber seal is installed correctly and will provide a tight seal to keep out drafts and moisture.

Troubleshooting Common Issues

If you’re having trouble with your new rubber seal, don’t worry! Here are some common issues that you may encounter and how to fix them.

Gaps between the Door and the Threshold

If you notice gaps between the exterior door threshold and the door, it could be a sign that the seal is not installed correctly. Check the channel to make sure it’s clean and free of debris. If there is debris, use a chisel to remove it.

Next, try adjusting the hinges to make sure the door is properly aligned. If the hinges are loose, tighten them with a screwdriver. If the hinges are damaged, you may need to replace them.

Issues with the Hinges or Pins

If you’re still having trouble with gaps, check the hinges and pins. Over time, hinges and pins can become worn or damaged, causing the door to sag and creating gaps. If this is the case, you may need to replace the hinges or pins. Make sure to choose a replacement that matches the specifications of your door.

If you’re still having trouble, try adjusting the threshold. Most thresholds have screws that allow you to adjust the height. If the threshold is too high or too low, it can cause gaps. Adjust the screws until the threshold is level with the floor.

By following these troubleshooting tips, you should be able to fix any issues with your new rubber seal. If you’re still having trouble, don’t hesitate to contact a professional for help.


Replacing the rubber seal on your door threshold is a straightforward process that can help improve the energy efficiency of your home while also preventing water damage and drafts. By following the steps outlined in this guide, you can easily remove the old seal and install a new one in just a few hours.

Remember to take accurate measurements of your door threshold and purchase a seal that fits properly. It’s also important to clean the area thoroughly before installing the new seal to ensure a tight, secure fit.

If you encounter any issues during the installation process, don’t hesitate to consult with a professional or seek additional guidance online. With a little patience and attention to detail, you can successfully replace the rubber seal on your door threshold and enjoy the benefits of a more energy-efficient and weather-resistant home.