Weatherization For Drafty Windows: The Ultimate Guide

If you live in a house or apartment where the windows are a little older, one of the biggest issues you may face is air leaks. Not only can these leaks make it difficult to keep your home at a comfortable temperature, but they can also cause your energy bills to skyrocket. That’s why weatherizing your windows is such an important process. In this guide, we’ll take a closer look at how you can weatherproof your home’s windows and keep it warm and cozy during the colder months.

Finding Air Leaks

The first step in weatherizing your windows is finding the air leaks. There are a few ways to do this, and you can use any or all of them to make sure you find every possible air leak in your home.

Hand Test

On a cold, windy day, simply hold your hand up to the window frame. You should be able to feel the cool air coming through any gaps or cracks in the frame.

Candle Test

Light a candle and hold it up to the window frame. If the flame flickers or moves, there’s a leak in the frame.

Smoke Test

Light a stick of incense or a thin piece of paper on fire and hold it up to the window frame. If the smoke or flame moves, there’s an air leak.

Caulking and Weatherstripping

Once you’ve found all the air leaks, it’s time to take action. Caulking and weatherstripping are two of the most effective methods for sealing gaps and cracks.


Caulking is a type of sealant that’s used to seal gaps and cracks in your windows. You’ll need a caulking gun and some caulk (either silicone or acrylic-latex) to get started. Here are the steps you’ll need to follow:

  1. Clean the area around the gap or crack with a putty knife or scraper.
  2. Load the caulking gun with caulk.
  3. Apply the caulk in a single, continuous line along the gap or crack.
  4. Use a caulk smoothing tool or your finger to smooth out the caulk and make it flush with the surface.


Weatherstripping is a strip of material that’s used to seal gaps between moving parts of your windows, such as the sash and frame. There are several types of weatherstripping to choose from, including:

  • V-strip
  • Felt
  • Foam
  • Tubular

Each type of weatherstripping has its own advantages and disadvantages, so it’s best to research your options before choosing the right one for your windows.

Window Film

Window film is a plastic film that’s applied directly to your windows. It’s a great option for those who don’t want to go through the hassle of caulking and weatherstripping. Here’s how to apply window film to your windows:

  1. Clean the window thoroughly with soap and water.
  2. Cut the window film to the correct size.
  3. Spray the window with a soapy water solution.
  4. Apply the film to the window, starting at the top and working your way down.
  5. Use a squeegee to remove any bubbles or wrinkles.

Draft Stoppers

Finally, draft stoppers are a quick and easy way to seal gaps at the bottom of your windows. They’re essentially long, thin pillows that you place at the bottom of the window. You can make draft stoppers yourself using old socks or fabric, or you can purchase them online or at a home improvement store.


Weatherizing your home’s windows is a simple and effective way to keep your home warm and cozy during the colder months. By using a combination of caulking, weatherstripping, window film, and draft stoppers, you can effectively seal air leaks and reduce your energy bills. So why wait? Start weatherizing your windows today!

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