There is nothing worse than losing your valuable heat indoors in winter, and your cool air in summer through gaps between your door and the frame. Luckily there is a relatively simple solution to this problem, which you can do yourself.

To seal a gap between a door and frame, you should fix your hinges if it is a clearance problem or replace your weatherstripping that may have worn. You should also install or replace a door sweep at the bottom of your door to complete the door seal.

If you seek advice on installing new weatherstripping or how to seal a gap between your door and frame, you have come to the right place. Read on to find out how to get rid of those gaps once and for all.

Why Are Gaps Between the Door and the Frame Bad?

  • Heat Loss – Besides Windows, doors are the worst culprits in heat loss. It causes a marked increase in residential homes’ energy consumption. Between your windows and doors account for 20 to thirty percent of a home’s heat loss.
  • Loss of Cooling – Not only will gaps allow warm air to escape, but you will also lose your cold air-conditioned air in the summer and increase your bills.
  • Water Damage – Gaps in exterior doors may let in rain and moisture, which could damage your home’s interior.
  • Entry to Pests – Gaps in your doors are also an entryway to pests. A sturdy aluminum threshold and a door sweep can help keep out those unwanted little intruders.

How Much of a Gap Should There Be?

There should be some space between the door and the frame for your door to open and close properly. The gap between the sides and top should be the same as the Nickel’s width (2mm) and 8mm between the door and floor.

Even though a widened gap around your door and frame may not seem much of an emergency, it should be considered an important task. No one should pay unnecessary heating or cooling bills if they don’t have to.

Why Is There a Gap Between Your Door and Frame?

Before you remove or replace your weatherstripping, ensure that the gaps are due to worn weatherstripping and not faulty hinges. To test if your hinges are loose, take your door by the handle and lift it. If the door moves upwards, then it is a hinge problem that causes the gaps, and a hinge repair will sort out your problems.

  • Sometimes gaps may be caused by loose or missing screws. Open the door and ensure that the screws are in, and are correctly tightened.
  • If your screws are loose and can not be appropriately aligned, you may use a thread lock to secure them.
  • Ensure that all the hinges are the same size and that a heavyweight hinge is not mixed with the standard weight hinges.

Your door’s weather seals can often bend, compress, or wear out over time and leave a gap that lets your internal temperatures go outside. Weatherstrips are the soft and flexible material placed in the door jamb and header to keep out wind, water and keep your temperatures indoors.

Signs That You Need New Weatherstripping

  • There is light shining around your closed door. If you can see the light shining and gaps around your external door, it’s an excellent sign that you need to replace your weatherstripping. Even the smallest gaps are going to lose you heat in winter and coolness in summer, so installing new weatherstripping will save you money as well as comfort.
  • There is water leakage around your door frame. If you notice water around your door jamb or frame when it rains, your weatherstripping is no longer functioning. The water leakage through the gaps can cause mold or rot-related damage and affect your home’s door and interior. Remember that once damp and rot has set in, it can be costly to eradicate.
  • Your weatherstripping is bent, cracked, or flattened. When your weatherstrip becomes aged, it becomes dry and warped and no longer acts as a seal to the outside air. For weatherstripping to function, it needs to provide consistent compression around your door that forms a proper seal. This seal protects your home from water damage and reduces your energy consumption from air conditioning and indoor heating.

How to Seal a Gap Between a Door and Frame

A properly sealed door needs two main components. The weatherstripping covering the top and sides of your door, and a door sweep covering the bottom of your door. Remember, even a deceptively small gap around your doorway can increase your heat or AC loss to the outside.

1. Install New Weatherstripping

Choose the weatherstripping best suited to the area where the door is situated. The weatherstripping that you chose should seal well when the door is closed but still allow it to open freely.

Types of Weatherstripping

  • Felt and Open-Cell Foams. These are much cheaper, but they are not very weather resistant. They are somewhat visible and aren’t the best at blocking airflow because of their porous nature. However, they are straightforward to apply and may be fine in your home’s low traffic area.
  • Vinyl Weatherstripping. This is slightly more pricey. However, it is more durable and has high moisture resistance.
  • Felt-Based Weatherstripping. It can be plain or reinforced, but is quite delicate and needs to be replaced yearly. They are not useful in high moisture or high traffic environments.
  • Metal Weatherstripping. This is available in bronze, stainless steel, and copper. Although they are more pricey, they are extremely durable and can fit in more with an older home aesthetic.
  • Tubular Rubber and Vinyl. This weatherstripping is resilient and holds a tight seal. This type of stripping can be more challenging to install but has a lifespan of 5 years plus. This type of stripping is highly durable and does not suffer compression easily as your door swells and shrinks.
  • Foam Tape. This is made from open or closed-cell foam or EPDM rubber and sold in varying widths and thicknesses. It is suited well to fit irregular gaps. It is easy to use and only requires fitting and adhering to the inside of your door frames.

Top-Rated Weatherstripping for 2020

How to Install New Weatherstripping

If your door is not previously fitted for weatherstripping, installing the new weatherstripping shouldn’t be difficult. Ensure that your surfaces and grooves are scrupulously clean before laying new weatherstripping.

Installation process:

  1. Cut and nail the door jamb weatherstripping. Close your door and measure the top part of the frame from side to side. Mark this measurement down on your weatherstripping with a precise thin line.
  2. Cut the top piece of your weatherstripping. Cut the soft part of your weatherstripping with a knife or scissors and cut the plate with a fine-tooth saw or hacksaw.
  3. Nail in your top piece of weatherstripping. Pace your weatherstrip with the soft side has its entire length against the door. Tap 1-½ inch nails into the flange by lightly tacking it in place without driving the nails home. Then measure the side frames of your doorway.
  4. Cut your side pieces. Cut each end of your side stripping to fit your top piece’s shape by using a piece of scrap as a guide. Cut the foam with scissors and the flange with a fine-tooth saw.
  5. Adjust your cut. Either file or sand your cut edge for the tightest possible fit. Measure and cut the bottom to length and pace the strips so that the entire seal is against the door and tack it into place.
  6. Check the fit. Make sure the stripping fits flush without affecting the movement of your door and that your door locks. Once the fit is right, you may drive in the nails. Ensure that you place the nails about 2 inches from the ends and about 12 inches (30cm) apart to prevent splitting. Make sure your joins are flush before nailing in the nails.

2. Install a Door Sweep

Door sweeps fit between the bottom of the door and the floor and are pieces of flat plastic, aluminum, and stainless steel fitted with a strip of vinyl, nylon, or a brush. The brush neatly closes up your gaps without interfering with the movement of your door.

How to install a door sweep:

  1. Measure the bottom of your door. Remove the old sweep and clean the area thoroughly.  Measure the width of the bottom of your door from the inside and mark the length on your sweep.
  2. Cut Your sweep to size. Using your measurements, cut the foam with scissors or a knife, and trim the flange with a fine-tooth saw.
  3. Mark your placement points. Place your sweep with the soft portion lightly touching the top of your door threshold. Mark the screw positions and drill with a 3/32″ drill bit.
  4. Attach the sweep. Screw the sweep down against the threshold and open and close your door to test if the sweep is in the right position.
  5. Attach felt pads to the bottom door edge. Cut out two 1-¾ (4.44cm) inch pads from ⅛ inch thick felt. Nail the pads to the bottom of each side of the frame. Open and shut the door to ensure the fit. The felt size could be adjusted to fit your particular frame, or overlaid to add thickness.


With these few simple steps, not only will your home be more comfortable in hot or wintry weather, but you can save on your energy consumption and reduce noise. Although small gaps may seem innocuous, they can end up costing you in the long run. As we have shown, you don’t need to hire an expert and pay for their time when you can achieve the same results yourself with just the price of the parts.

We have included this video clip which shows how to tackle older doors with some frame damage that still need weatherstripping if you would like to see how it is done:

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