How To Insulate A Wooden Front Door

Do you feel unpleasant, cool air and drafts passing through your door, and making your house or workplace colder?

Is your door poorly insulated, or not insulated at all? Insulating the front door can significantly improve the temperature of your space. With a combination of air sealing and direct insulation, you can easily insulate your wooden front door.

There are a number of different ways to do so, including:

  • Using a door sweep
  • Adding window film
  • Sealing cracks with caulk
  • Installing a storm door
  • Weatherstripping door
Wooden front door

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How Can I Make My Front Door Warmer?

The front door is one of the main spots in the house from where cold, wind, and humidity can pass through. This can greatly affect the temperature within your house and affect the level of comfort you feel. 

You can make your front door warmer using a few simple methods. An insulation film can be a great addition, especially if your door has one large glass surface. This film can reduce the amount of heat loss and also has UV-blocking benefits. One major advantage of a window film is that you may see up to a 40% decrease in your electric bills. 

Another way of protecting your front door from the cold is by installing a storm door. Essentially, this is a glass door installed over your existing front door. Its main purpose is to shield your home from the cold, rain, or wind. It also allows natural light to come in and can improve your home’s security.

Those living in a milder climate may benefit more from a screen door. Instead of glass, this door features a screen that allows for improved ventilation while still providing ample protection. 

Can You Insulate A Wooden Door?

Yes, it is completely possible and actually beneficial to insulate a wooden door.

One of the best ways to insulate your house is by focusing on the doors and windows as these are the main areas that quickly gain or lose heat as the season changes. 

If you live in a cooler climate with harsh and cold winters, you should definitely consider insulating your front door. This can regulate the temperature of your home and also improve its overall energy efficiency.

Insulating the door yourself at home is an accessible and inexpensive option. Alternatively, you can hire a professional for the job.

Remember, wood is a fragile material that can degrade under conditions like moisture. It can also be attacked by xylophage insects. So, before insulating your wooden door it would be a good idea to get it treated first.  

Benefits Of Insulating A Door: Especially If It’s Old

There are several benefits of insulating your front door, especially if it is done well. Poorly insulated doors and windows can result in heat loss of up to 20%, so you want to get it right.

An old front door is usually not airtight and has many open gaps and spaces. These openings can become a home for humidity and drafts. Cold air from outside can enter the room and create an uncomfortable, unpleasant place to be.

This means you will have to rely on heating appliances to keep your house warm, resulting in an increase in the electricity bill. Insulation can be a great solution for this problem. 

Another benefit of insulation is that it can protect your home from other issues. With air entering into the house, there are chances of moisture and mold trapping around the door frame. This can make the air unhealthy to breathe in. In addition, pests can also settle in these areas. 

So, insulation is highly recommended for doors and windows.

Is Your Door Leaking Air?

It can be very frustrating when you suspect that air is coming into your house but you can’t tell where its from. 

There are a few simple ways to find out where the air leak is coming from:

1. Look for daylight

If you’re checking for air leaks, you can look for any spaces where light is coming from. Make the room pitch dark and close all the windows and doors. Now, look for any spaces where light is peeking through. You will find out that air is also coming in from the same spaces. 

2. Worn out caulk

Sometimes, air can pass through when old caulk has started coming off. This can expose cracks and gaps. Check around the door frame to see if the caulk is still intact or has worn off. You can apply a new layer of caulk to seal the gaps again.

3. Using a smoke test

Make sure to turn off combustion appliances before you carry out the test. Also close all the windows and doors tightly. To get the most accurate results, you can turn on the exhaust fan to suck out all the air from the room.

Now, light an incense stick or candle and pass it under the door. If smoke blows into the room or gets sucked out, this means there is an air leak present. 

How Do I Stop Cold Air From Coming Through My Front Door?

Air gaps do not just let cold air come in, but they also allow heat to escape quickly which can lead to high energy costs. In the summer, air gaps in your front door can also lead to hot air coming in which can increase your dependence on air-conditioning. 

Let’s take a look at some simple fixes for air gaps in your front door:

1. Door Sweeps

A door sweep can help you seal the gap between the door’s bottom and the threshold. It also very easy to install. An under-door sweep can provide a tight seal under your door and prevent dust as well as cooling or heating loss. 

Typically, door sweeps should be installed on the inside as most entry doors are “in-swinging” doors.

Vice-versa, a door sweep can be attached to the outside of an “out-swinging” door. 

2. Caulk Any Cracks

Another way to insulate your door is to caulk the cracks around your door. Look for areas where air might be able to pass through and caulk them.

3. Add Window Insulation

If your wooden front door has a glass window insert, you can try adding a window insulation. This is a basically a film that acts as a protective layer for your door window and acts as an insulating barrier between the interior and exterior.

How To Add A Door Sweep?

When buying a door sweep, you should make sure it adequately fills the gap under your front door. 

It is necessary to remove the door to add some door sweeps. You can do this by removing the door hinges including hinge pins and then setting it on a flat surface. The sweep can then be screwed or stuck to the bottom of the door. Stick-on sweeps are also an option, but these styles are not particularly durable. 

How To Caulk Cracks?

Caulk is a material used to fill in or seal any open joints or seams in different structures. You can caulk any cracks in the front door by simply running a line of caulk along the crack. Now, you should smooth out the line by using a caulk gun or your finger. 

A caulk gun can give a smoother finish as it applies a steady pressure. You can use your hands as well, but this tends to give a more messy finish.

Should You Weatherstrip Your Door?

According to a report by Energy Star, weatherstripping your door can help you save almost 20% on cooling and heating costs. It has insulating properties to regulate your home’s temperature and keep draft away. 

The best part is you can weatherstrip your door yourself as this DIY project is not a difficult one. 

There are different types of weatherstripping materials you can choose from. This includes foam, felt and rubber. Foam is relatively easier to install while rubber can be a little challenging. However, rubber is the most durable option of all.

How Do You Weatherstrip A Door?

The correct method for weatherstripping mainly depends on the type of weatherstripping you want.

  • Regardless of the style, your first step should be to remove any old weatherstripping. Most of the time, you can do this by simply pulling it off. Sometimes, you might need to use a drill.
  • Take some time to clean the door properly, including the jamb. Make sure to get all the debris and dirt out. You can do this by scrubbing thoroughly with soapy water. If there is any residual buildup, you can use a fine-grit sandpaper to remove it.
  • Now you need to do some measuring. Measure the sides of the door, as well as the top and bottom. Also measure the jamb of the door. You need to buy the right amount of weatherstripping to cover the height and width of the door. You might want to buy 10% extra, just to be safe.
  • Next, take the new weatherstripping and apply it on the provided slot. Some weatherstripping products have an adhesive back so you can simply peel it off and press the strip into place.  When you reach the corners of the door, use pieces cut at a 45 degree angle to get a proper fit. 


There’s no doubt that insulating a wooden door is important to make sure you do if you want to keep cold drafts away. Not only that, any small gaps can be prone to letting moisture through, therefore this will greatly increase the risk of mold growing.

Now you that you know how to insulate a wooden front door, you can look forward to enjoying a warmer, more comfortable space.

Something else to watch out for is when a wooden door gets stuck. Find out how to open a stuck wooden door.