The cost of energy has been on the upward trend and this has forced many homeowners in Europe and the UK to look for ways to improve their energy efficiency particularly, those with homes with single glazed windows. One of the best ways to improve the energy efficiency of a listed building is by double glazing windows with an insulated glazing. This new trend has been adopted in most period properties mainly because of the improvements witnessed in glazing technology. In this guide, we will discuss the importance of reglazing old windows with insulated glazing as well as the disadvantages of using this approach.

How insulated glazing has evolved

Double glazing is a concept that has been around for decades and has evolved over time. Some years back, double glazing had many challenges including being too thick to retrofit single glazed sashes. Additionally, the visible scraper was also a huge problem. But over time, manufacturers have been able to reduce thinner double glazing known as slim lines.

But some planning authorities rejected it saying that it was not good enough for reglazing. VIG glass was later introduced for listed buildings but it also did not penetrate the market because it had visible caps. Another double glazing was introduced three years later known as FINEO glass that was produced by Panasonic, in partnership with AGC.

Reglazing old windows with modern insulated glazing

Improvements in double glazing technology has led to increased use of modern insulated glazing in listed buildings. Homeowners now have a chance to install; insulated glazing that not only makes their home more energy efficient but also preserve original joinery. In fact, today, you are more likely to get permission to reglaze windows with FINEO glass compared to doing a full window replacement with new double glazed sash windows.

What is the best solution for listed windows?

Reglazing old windows is quickly becoming the new trend, especially for grade 2 listed properties. This is because it helps to preserve the classic features of the property as well as improve the energy of both windows and classic French doors. Property owners can now preserve their classic window design while at the same time make them more energy efficient, thanks to VIG glazing.

Principle of window insulation

Because a window is a good heat conductor, the main principle of window insulation is to always create a barrier to stop heat transfer via the single glass pane. For the case of secondary glazing, an extra line of window and an air gap is added to prevent heat loss. The first double glazed panes only had air between the glass panes. But later, inert gasses were inflated on the gap because they have better conductivity of heat compared to air. But vacuum is the best solution because it does not transmit heat in any way, making it a great insulation barrier.

Bottom line

Double glazing has many benefits, including improved security, reduced external noise and greater energy efficiency. But installing a double glazing window in a listed building is quite challenging because it alters the appearance of the building. VIG glazing is the best choice because it allows property owners to re-glaze their windows without altering their classic design.