Weatherstripping helps create a seal between an exterior door and its frame. When it is working as intended, it helps keep outdoor air outside where it belongs.
Over time, weatherstripping can become worn, damaged, compressed, or loose. This can create a gap in door weatherstripping that lets cold air into your home in the winter or hot air in during the summer.
However, weatherstripping is not always the problem. The door may be out of alignment. There could also be an issue with the threshold, frame, or door itself.
Not sure where to start? This guide explains how to spot gaps around your door and what you can do to fix them.
Some weatherstripping problems are easy to see. Others may only become noticeable when the weather changes. Here are six signs that your door may not have a tight seal.
One of the easiest ways to check your door is to look for light.
Close the door during the day. Then, look closely along the top and both sides. If you can see daylight between the door and frame, there may be a gap in the seal.
Do you feel cold air when you walk past your front door? The weatherstripping may not be making full contact with the door.
Try checking on a cold or windy day. Close the door and slowly move your hand around its edges. You may be able to feel where cold air is entering.
A simple piece of paper can help you check the seal.
Open the door and place a piece of paper between the door and the weatherstripping. Close the door. Then, gently pull on the paper.
You should feel some resistance if the weatherstripping is making contact. If the paper slides out easily, there may be a gap.
Repeat the test in several places. One part of the door may have a good seal while another does not.
Take a close look at the weatherstripping around the door. Check for cracks, tears, missing sections, or peeling adhesive.
You may also notice areas that look flat or compressed. Some types of weatherstripping should spring back after the door opens. If the material stays flattened, it may no longer create a tight seal.
The bottom corners of a door can be easy to overlook.
Check the places where the weatherstripping along the sides meets the threshold and door sweep. A small gap here can let air through even if the rest of the door seems well sealed.
Some doors use corner seals to help close these small openings. If a corner seal is damaged or missing, you may notice a draft in that area.
The door sweep helps seal the space between the bottom of the door and the threshold.
Close the door and look for light underneath it.
If you can see a gap, inspect the sweep. It may be cracked, bent, worn, or sitting too high. The threshold may also be uneven or damaged. Either problem can prevent the sweep from creating a consistent seal.
Weatherstripping does not last forever. Every time you open and close the door, the material is pressed, rubbed, or moved. Over time, that wear can cause it to crack, tear, flatten, or pull away. If you feel a draft around a closed exterior door, worn or poorly fitting weatherstripping is one of the first places to check.
Adhesive-backed weatherstripping can peel away from the door frame. Heat, cold, moisture, and other outdoor conditions may speed up this wear.
Sometimes the weatherstripping itself is still in good condition. It may simply be loose or out of position. The wrong type or size of weatherstripping can also leave a gap.
The door can be another source of the problem. A door that has shifted may no longer press evenly against the weatherstripping. Loose hinges, latch problems, a damaged threshold, or changes to the door frame can also affect the seal.
That is why it is helpful to look at the whole door, first, before replacing the weatherstripping.
Start with the simplest possibility. Check whether the existing weatherstripping is loose or has moved out of position. If the material is still in good condition, it may only need to be adjusted.
If the weatherstripping is cracked, torn, flattened, or missing, replacement may be a better option.
There are several common types of weatherstripping:
The right choice depends on the size and location of the gap. Always follow the product manufacturer’s directions.
If you are using adhesive weatherstripping, remove the old material first. Clean the surface as directed so the new weatherstripping can make good contact. Cut the new material to fit instead of stretching it into place.
Once it is installed, close the door. Make sure the door still latches and operates normally. Then, check the seal again for light or drafts.
New weatherstripping can help close some gaps. However, it cannot make a damaged or poorly fitting door sit correctly in its frame. If the door itself has shifted or deteriorated, you may need to address the larger problem.
Open and close the door several times. Does it move smoothly? Does it stick, drag, or rub against the frame? Do you have to push or pull harder than usual to get it to latch?
Next, look at the spacing around the closed door. The gaps should look fairly even. A large gap on one side or at one corner may point to an alignment problem.
Check the hinges for obvious looseness or movement. Then, inspect the door frame and threshold. Look for cracking, rot, warping, or other visible damage.
It may be time to think about replacing your door if:
These problems may mean there is more going on than worn weatherstripping, and you may need a new door.
A door needs enough clearance to open and close normally. However, the weatherstripping should make consistent contact with the closed door. You should not see obvious openings that allow light or drafts to pass through.
If the spacing around the door is large or uneven, there may be an alignment issue rather than a simple weatherstripping problem.
It is generally better to remove weatherstripping that is worn, damaged, or no longer attached properly before installing new material.
Old weatherstripping can prevent the replacement material from fitting as intended. Adhesive products may also need a clean surface to stick properly. Always follow the instructions for the weatherstripping you choose.
Weatherstripping is only one possible source of air leaks around a door.
Check the sweep, threshold, and bottom corners. You should also look at how the door sits in its frame. Loose hinges, alignment problems, damage to the frame, or a warped door may leave gaps that new weatherstripping cannot fix.
A small weatherstripping problem may have a simple solution. But an aging, damaged, warped, or poorly fitting door may need more than a new seal.
Renewal by Andersen offers replacement exterior doors designed for your home. We also handle the entire replacement process from start to finish. Certified Master Installers complete the installation to help make sure your new door fits and operates as intended.
If ongoing gaps or drafts keep returning and new weatherstripping is no longer solving the problem, then your door may be ready to be replaced. We can help.
Schedule a free consultation with Renewal by Andersen to explore your replacement door options.
