Sash Window Draught Proofing

Call Us Today 07565028004

Welcome to Sash Window Refurbish

Experts in Sash Windows Repair & Restoration, Timber Windows & Timber Doors in east midlands

Sash window draught proofing is becoming more and more popular because of its incredible benefits. Since the ancient era of Georgia and Victoria, sash windows have always stood out because of their unique properties. However, they have a few technical setbacks.

Sash window gaps

One of the main setbacks of sash windows is that they are single-glazed, meaning they don’t have weather trips, rubber seals, or draught excluders. As a result, they allow hot air to escape and cold air in, thus making the room inefficient in energy. This is a huge setback, especially during the cold winter season.

Additionally, sash windows rattle when there are strong winds and this can result in condensation issues, especially when other factors come into play. Some timber frames and layers of old paint can also shrink, creating more significant gaps that cause more rattles and draughts. Most new sash windows have gaps between the upper moving and lower moving sashes as well as the frame which can cause more draughts.

Now let's take a look at how sash window draught proofing can improve the efficiency of your windows by minimizing heat loss. This procedure has four key benefits. They include:
  • It allows sashes to go back and forth smoothly
  • It helps to reduce the rattling of window
  • It prevents cold draughts
  • It helps to lower your heating energy by minimizing heat loss

    How Sash Window Draught Proofing Works

    Now that you know the benefits of draught-proof sash windows, let’s take a look at how it works. This simple procedure begins with removing sashes from the frame and then cutting the grooves. A draught-proof bush is then installed, followed by installing a new parting bead. Once you are done, the next step is replacing the staff bead, and installing a draught-proof strip both at the top and bottom rail as well as the meeting rail.

    Sash window insulation using felt strip

    The draught excluder and adjustments will be hidden from view unless one of the sashes is open. However, it will not affect the classic appearance that sash windows are known for. The weather strip will only be visible when you open the lower sash.


    Step-By-Step Process of Draught-Proofing Sash Windows

    • Step 1: Remove the parting bead and old stuff
    • Step 2: Remove both the upper and lower sash from the frame and sash cords
    • Step 3: Create channels on sashes for draught excluders
    • Step 4: Install draught excluder seals
    • Step 5: Install parting beads and new staff as well as weather strips
      Insert weatherstrip 1
      Insert weatherstrip 2

      Draught Proofing of Casement Windows

      If you wonder whether this type of window can also be draught proofed, then a simple answer is YES. However, the process is quite different from sash windows, but the same draught seals and tools are used.

      Since casement windows have a simpler design and fewer features, it is much easier to remove sashes from the window frame. As such, it is much easier to install a draught seal to the frame.

      Why Draught Proofing Window Not Enough

      Draught-proofing your windows is a good move; however, it is not enough, especially if you want to reduce external noise, lower heat loss, and most importantly save your energy bills. If you want to achieve all these, then you need to replace the single glazing with double-glazing units. This way, your sash windows will be more energy efficient, thus reducing your monthly energy costs.

      So if you want to convert your old sash windows to super windows, you need to drought-proof them and add a double-glazing unit. Replacing the single glazing (with a U-value of 5-5.8W) with slim profile vacuum double glazing (with U value of 0.7W) will make your sash windows more energy efficient than modern wooden windows that are fitted with standard double glazing units.

      Read our secondary glazing

      Final Thoughts

      From the discussion above, it is evident that draught-proofing is beneficial but not good enough. If you want to fix condensation issues and improve energy efficiency in your home then you should consider installing double-glazed units.

      The cost of drought-proofing both sashes ranges between £280 and £360, depending on access and the size of the window. We offer draught-proofing and window frame restoration services. For sash window refurbishment and double glazing, please visit our Contact Page for more details.

      Sash window draught proofing is becoming more and more popular because of its incredible benefits. Since the ancient era of Georgia and Victoria, sash windows have always stood out because of their unique properties. However, they have a few technical setbacks.


      My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



      I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

      Alan W.


      I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

      Kelly (Sleaford)


      Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

      Steaven Reader


      Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



      Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

      Cris M.