How To Draught Proof A Sash Window

If you live in Sydney, you may have experienced the discomfort of draughty sash windows during the colder months. Draughts not only make your home feel chilly and uncomfortable, but they can also lead to higher energy bills as your heating system struggles to keep up. Fortunately, there are effective ways to draught-proof your sash windows and improve the comfort and energy efficiency of your home. In this guide, we’ll walk you through the steps of draught-proofing your sash windows, and provide expert tips from Inner West Window Specialists, who service all of Sydney.

Identify the Draught Sources

Before you start draught-proofing your sash windows, it’s crucial to identify the sources of the draughts. Common areas where draughts may occur include gaps between the window frames, loose or damaged putty, or worn-out weatherstripping. Carefully inspect your sash windows to pinpoint these problem areas, as this will help you determine the best draught-proofing techniques for your specific windows.

Choose the Right Draught-Proofing Materials

Once you’ve identified the draught sources, it’s time to gather the necessary materials. For draught-proofing your sash windows, you’ll need:

  1. Draught Excluder Strips: These self-adhesive strips come in various sizes and materials, such as foam, rubber, or brush. They can be affixed to the window frame or sash to seal gaps and prevent draughts.
  2. Sealant or Putty: If you notice gaps between the window frame and the wall, using sealant or putty can effectively fill these spaces and prevent draughts from entering.
  3. Weatherstripping: Installing weatherstripping around the window sash helps create a tight seal when the window is closed, reducing draughts.
  4. Draught-Proofing Brushes: These brushes can be attached to the bottom of the sash to prevent draughts from coming in from the sides or beneath the window.

Seal the Gaps and Cracks

Now that you have the necessary materials, it’s time to draught-proof your sash windows. Start by sealing any gaps or cracks between the window frames and the wall using sealant or putty. Use a putty knife to apply the sealant evenly, and make sure to fill all the crevices.

Apply Draught Excluder Strips

Next, apply draught excluder strips to the window frame and sash. Measure the dimensions of your sash window and cut the strips to fit accordingly. Peel off the backing of the adhesive and press the strips firmly into place, ensuring a tight seal.

Install Weatherstripping and Draught-Proofing Brushes

For additional protection against draughts, consider installing weatherstripping around the window sash. Measure the length needed, cut the weatherstripping to size, and attach it securely around the sash. Make sure the sash closes tightly against the frame when the window is shut.

To prevent draughts from coming in from the sides or beneath the window, attach draught-proofing brushes to the bottom of the sash. These brushes will act as a barrier, preventing cold air from entering your home.


Draught-proofing your sash windows is a practical and cost-effective way to enhance the comfort and energy efficiency of your home. By identifying the draught sources and choosing the right materials, such as draught excluder strips, weatherstripping, and brushes, you can significantly reduce heat loss and save on energy bills. If you’re unsure about the best draught-proofing techniques for your sash windows or need professional assistance, contact our team at Inner West Window Specialists – we service all of Sydney. Our team of experts can help you assess your windows and provide tailored solutions to make your home draught-free and more comfortable all year round.