Can Old Wooden Windows Be Double Glazed?

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Sash Windows Refurbish specializes in providing repair and restoration services for wooden windows and doors in the UK, as well as various types of carpentry. During the process of fulfilling orders, we utilize a range of tools and paints, including saws, sprays, primers, resins, and adhesives. With more than 20 years of experience in carpentry, we have tested and used various brands and types of work tools, making us well-equipped to offer helpful advice on selecting the right tools and paints for your needs. Read more ...

Certainly, it is not only possible but also a common practice to install double glazing in wooden windows. The same double-glazing techniques used in plastic or aluminium windows apply to wooden ones as well.

Wooden windows have been equipped with both double and triple glazing for many years. In this blog post, we will provide more detailed information about the process of double-glazing windows.

As a seasoned joinery firm, we were surprised when a client asked, “Can I have double-glazed wooden windows?” However, if one client had this question, it’s likely that others have also wondered about the feasibility and may have overlooked wooden windows altogether.

It’s essential to debunk the misconception that double glazing is exclusive to plastic windows, as wooden windows can also be upgraded with this technology.


What Types of double glazing do we use?

Sash Window Refurbish commonly utilize a double-glazed unit that is 24mm thick, just slightly less than an inch, in the windows displayed above. This specific type of double glazing includes a warm edge spacer bar, argon gas filling the void within the unit, and an energy-saving coating.

The warm edge spacer represents an advancement from the older double glazing, which used metal spacers. Identifying the older and less efficient double glazing is easy as it has a shiny metallic appearance, whereas the modern version boasts a matte finish and effectively minimizes heat loss around the edges.

In addition to the standard units, we also offer slim double-glazed units, as depicted in the image below. These units are specially designed for wooden windows and feature a much smaller spacer bar compared to the regular units we provide.

Typically, these units are only 12mm thick. Similar to the standard units, these slim versions come with a warm edge spacer bar, gas filling the void (usually krypton), and an energy-saving coating. They find their application in heritage settings where slim solid glazing bars are necessary.

Furthermore, there is an innovative product, suitable for situations akin to the slim units. These unique units serve a significant role, especially in wooden windows. We have a sample unit available at our workshop, and we invite potential clients to arrange a visit to personally observe and discuss the promising features these units offer.

Can double-glazed units be replaced?

Double-glazed units have the potential to be replaced without requiring the entire window or joinery item to be changed.

When a double-glazed unit becomes faulty, it does not necessarily mean the entire window structure needs replacement. Historical evidence indicates that wooden windows can endure for a century or even longer. Therefore, there’s no need to panic if a double-glazed unit becomes foggy.

The process of replacing a faulty unit is relatively straightforward. One side of the frame that supports the glass features beading, which can be removed to take out the defective unit and install a new one. While this can be a do-it-yourself task, it is advisable to hire a professional glazing contractor for the job.

What is the Lifespan of Wooden Double-Glazed Windows?

With proper maintenance, the wooden frames of a window can endure for a lifetime. On average, double glazing usually remains effective for about 20 years. We are transitioning to a new glazing method that maximizes the lifespan of double-glazed units.

If you wish to talk about your glazing needs, feel free to send us an email through our contacts page.

Tips:

  1. Assess Your Existing Windows: Before considering double-glazing, evaluate the condition of your existing windows. Don’t invest in double-glazing for windows that are already poor quality or draughty.
  2. Address Draughts First: Even good windows can have draughts, so fix these issues before adding double-glazing. Draughty windows can significantly reduce the benefits of double-glazing.
  3. Consider Ventilation: Ensure that the installation won’t hinder your ability to open windows for ventilation in the summer. Some retrofit solutions might restrict window openings, so be cautious.
  4. Explore Alternatives: Evaluate whether spending on double-glazing is the most cost-effective solution. There might be other home improvement options that provide similar benefits without the hefty price tag.
  5. Check Window Suitability: Verify if your existing windows are structurally suitable for double-glazing. Older windows may not be strong enough to support the added weight, requiring reinforcements or replacements.
  6. Properly Adjust Double-Hung Windows: If you have double-hung windows, ensure that the counterweights and balances are adjusted correctly. Use heavy-duty pulleys and reinforced ropes or appropriate spiral balances designed for the weight of double-glazed units.

In essence, before investing in double-glazing, assess your windows’ condition, fix any draught issues, consider ventilation, explore cost-effective alternatives, check window suitability, and ensure proper adjustments for double-hung windows.

About the author

Glen Ramsey, who presently holds the positions of customer support and content manager, is a cherished member of the Sash Window Refurbish team. He is in a unique position to provide advice on all questions pertaining to the renovation of historic windows because he has a wealth of experience in all elements of window renovation, dealing with clients regularly and assisting them in choosing the best window-related course of action. He oversees the creation of information for all of our platforms in his capacity as content manager, including web content and other materials. Glen has witnessed the whole gamut of Sash Window Refurbish's window restoration activities, from our work on significant listed Georgian homes to a wide variety of smaller-scale private residential projects.

Testimonials

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.

Trev

Client

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.

Client

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)

Client

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

Client

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.

Alice

Client

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.

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