How to Ensure an Interior Door is Airtight

Quck answer

To make an interior door airtight, follow these steps:

1. Check for gaps: Inspect the door for any gaps between the door and the frame. These gaps can allow air to pass through, reducing the door’s airtightness.

2. Install weatherstripping: Apply weatherstripping along the edges of the door to seal any gaps. This can be done using adhesive-backed foam tape or a door sweep. Make sure to measure and cut the weatherstripping to fit the dimensions of the door.

3. Seal the door bottom: Install a door sweep or a door bottom seal to prevent air from passing under the door. This will help improve the door’s airtightness.

4. Use door draft stoppers: Place draft stoppers along the bottom of the door to further block any drafts or air leaks.

5. Caulk or seal gaps: If there are any visible gaps or cracks around the door frame, use caulk or sealant to fill them in. This will create a tighter seal and improve the door’s airtightness.

By following these steps, you can make your interior door more airtight, improving energy efficiency and comfort in your home.


To decrease your heating expenses during the winter, it is important to create airtight seals around your doors. While you may have already sealed your exterior doors, interior doors can also allow cold air to enter, such as doors between a foyer or mudroom that lead to the rest of the house. Weatherstripping materials are highly effective in creating airtight seals.

Step 1

Gently lift the door using the doorknob to check for any loose hinges. Loose hinges can lead to draft problems, so make sure to tighten any that are loose in order to create an airtight door.

Step 2

Measure the length and width of your door in order to install weatherstripping. Additionally, measure the gaps between the door and the door frame, or jamb, as well as the gap between the door and the door stop. You will want to use weatherstripping that fits these gaps perfectly. There are various types of weatherstripping available, so choose one that suits your needs. Options include wrapped foam, which can conform to any type of gap and come in metal and wood versions, as well as vinyl and silicone bulb types. Although vinyl or silicone may not conform to wider gaps as effectively, they provide a cleaner appearance. If you have difficulty finding matching weatherstripping for older doors, contact a local door or window repair service for assistance in obtaining the necessary materials. Alternatively, if you know the manufacturer of your door, you can call their service number to obtain the appropriate materials.

Step 3

Install the weatherstripping to seal your door and eliminate drafts. Use a marker to indicate the correct lengths on your weatherstripping. Weatherstripping kits typically include long and short strips, so use a hacksaw to make the necessary cuts.

Step 4

Position the weatherstripping so that it gently compresses against the door frame. If the weatherstripping is compressed too tightly, the door will not close properly. Use a hammer and nails to secure the strips around your door. Hammer the nails about 2 inches from each end to prevent splitting, and space the remaining nails approximately 12 inches apart. Before hammering all of the nails into each piece, check the door to ensure it closes completely.

Step 5

Install a door sweep to block any potential drafts between your door and the floor. If your carpet or rug is higher than the bottom of your door frame, a door sweep cannot be used. In this case, use rolled-up towels to block drafts from the bottom of your door. If a door sweep is suitable, measure the width of your door and mark the cuts on the sweep using a marker. Use a hacksaw to cut the sweep to the appropriate size, and then attach it to your door using a drill and screws.

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