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The trend towards double glazing in the Heritage Sector


Double glazing is now a standard feature in all modern window systems, having supplanted single glazed windows since the 1960s. In the early days the product had its faults in terms of misting-up with condensation. Since then, major improvements in their construction and installation have eliminated these problems. The industry is now dominated by large manufacturers who supply products which are continuously audited for quality assurance, ensuring they comply with, and regularly exceed, British Standards.

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A heritage mansion with double gazed custom made arched windows

Current Practice for Historic Buildings

The extraordinary rise in heating costs over the past decade has forced owners of historic buildings to look at reducing running costs. Secondary glazing has had some appeal, but it’s been limited by aesthetic drawbacks. As an alternative, a slim double glazed sealed unit was developed, but not without its own reliability issues. The Glass and Glazing Federation (GGF), the industry body responsible for the manufacture of double glazing in the UK, has issued some stern warnings about the quality of slim (narrow cavity) units with reduced sightlines. In essence, the depth of sealant on the edge of double glazing is critical to both its longevity and performance.

It is the GGF’s position that only double glazed units which have met and passed the stringent British Standards tests (known as EN1279 parts 2 and 3) are suitable to be placed on the UK market. There are numerous suppliers currently offering products that do not comply with GGF rules, including the following companies:

The Next Generation

Fortunately, development has continued and there is now 3 suppliers in Britain complying fully with GGF requirements:

The Original Glass Company Histoglass Slimlite Timbalite
Compliant with parts 1-6 of BS EN 1279
Available with a 10mm unit
Available with 4mm Krypton gas cavity
Able to achieve U-values of 1.1 W/m2k
5 year product guarantee
Compliant with Document L of Building Regulations

Discuss your Project

If you’re involved in a historical restoration project, contact The Original Glass Company today. We can help you to make a success out of your project by providing insight, experience, and a wealth of knowledge on a range of issues related to historical buildings.

For Architects

Giving project architects the smoothest time possible from the time of planning to final installation, we develop Heritage units that help you overcome even the most difficult expectations.

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For Trade

We actively fabricate and supply our entire range of thin sealed units countrywide to the trade, letting all reputable trade installers cater for conservation builds.

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CE Mark Certification BS EN 1279 Accredited BS EN 12150 Accredited UKAS Certification UK manufactured

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