Scientifically proven Secondary Glazing, plus fire perfomance

Thermal insulation tests at Coventry University

In April 2014 we received confirmation that Extraglaze is a scientifically proven thermal insulation solution that beats a typical aluminium framed alternative.
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Beside the university's Environmental Chamber

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The university's Sustainable Buildings Future Project used their Environmental Chamber to compare Extraglaze with an aluminium-framed, glass-pane secondary glazing system...
...Extraglaze came out the clear leader.

With both systems tested on a single glazed sash window the U-value for Extraglaze proved 11% better (2.20W/m²) than the alternative product.

We already knew that Extraglaze would be a better solution to deal with condensation, and the tests confirmed it. In a humid room test (60%RH), with below zero temperatures outside (-5 and -10ºC), Extraglaze was an impressive 78% better.

Extraglaze put to the test in the Environmental Chamber

Sound insulation tests at the Building Research Establishment

In July 2013 a large timber framed window (1.3m² of visible glass) was installed in the Building Research Establishment's (BRE) Horizontal Transmission Suite, and tested against both our Extraglaze magnetic system (showing in the test suite photo below) and an aluminium framed glass secondary glazing system. A wide range of tests were made, to see how each type of secondary glazing could not only improve a single glazed window but even a double glazed window.
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Extraglaze put to the test in the Horizontal Transmission Suite
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To summarise the results both systems were rated "good" as a sound insulator for noise problems. We learned in particular that smaller panels do best, being more rigid, and the larger the gap, between the original window glass and the Extraglaze, the better. What surprised us most was that it didn't seem to make much difference whether the original window was double glazed or single glazed.

Proof in practice

In January 2014 Extraglaze was installed onto brand new triple glazed UPVC bay windows in a home by a main road. The triple glazing had been installed to cut the road noise but had proven ineffective. However, with the addition of Extraglaze road noise was almost completely eliminated. The customer was hugely relieved to finally get the result they wanted.
extraglaze soundproofing

Fire performance

For information about how Extraglaze is likely to behave in a fire please see our FAQ's : please look under the section ABOUT OUR PANELS and click the question: Is acrylic better than other glazing materials e.g. glass or PETg?

And news from customers...

We have an ever increasing number of fabulous testimonies from our customers, which can be seen in the many reviews they have left on Feefo. It is clear that our customers enjoy their homes much more now than they did before Extraglaze was installed, being much warmer and much quieter.

For more information about Extraglaze please view the information in this site or contact us on the number above.

If you are an engineer or architect please contact us to discuss the results of tests in more detail.

Reviews

2 months ago
We love then

Service rating : Simple website
Great samples
Very helpful on phone

Product : Product works as described , is easy to fit and you don’t notice it.
With some other makes when you remove the panel in the summer you are left with a black ugly Manet, but extraglazes magnet is the same colour as the window and ‘disappears’

The only negative is that they should show an example of a window with multiple openers with multiple panels vs one large panel.
We bought large panels which are a pain to store in summer and are now replacing them with individual panels which are far easier to remove and store

But overall we love them
2 months ago
Product : Great product
3 months ago
Excellent experience

Service rating : Everything went to plan. Product cut perfectly to size. Delivered to the door with friendliness and care. Would recommend the service.
Product : The product arrived on time, perfectly cut to size and finished, looks good and was easy to install. Cannot yet comment on its thermal insulation effectiveness since we are living through a U.K. heatwave. I will know in 8 months!
5 months ago
Product : Efficiently as improved insulation to a wide range of window shapes. Light and easily cleaned they can be fitted for you or done your self.

Stuart Day
6 months ago
Service rating : All very helpful and efficient

Product : Good system, looks great, not cheap, but will find out efficiency come winter.

Sam Mahon
8 months ago
Great product

Service rating : Would definitely recommend
Good product and customer service

Product : Easy to fit. Rooms much warmer. Condensation very much reduced. Very good customer service
9 months ago
Great Quality

Service rating : The product was well built, simple and solid. Easy to fit in and out of place as we can see fit. Very happy to recommend.
Product : It has made such a difference to our summer room. We had been using a compact air conditioning unit to keep the temperature down in the summer, but had been needing to leave a window open for the hose (which in turn let warm air in). Nic managed to design build and fit a simple extra glaze solution that enables us to feed the pipe through the window and keep the room closed. Very happy with the product.

Phil Birtwhistle
9 months ago
Great product and service

Service rating : Great customer service - no quibble when we receive a product with a defect. Service seems personal, human and so much better than a large company.
Product : Great product that has really helped us make our draughty old Victorian house much more energy efficient. There's an added bonus that we also hear much less noise from the road outside. They look great too - visitors are often amazed when we show them that they are there!

SLC
9 months ago
Fantastic, helpful company

Service rating : Great company. Easy to order, clear measuring guides, very well made. I always get a phone call when my order is ready, to arrange delivery.
Great, personal customer service, which is rare these days!
Product : These secondary glazing panels are perfect for my draughty little listed house. They are easy to use, look great (hardly noticeable) and are very effective at stopping the draughts.
I'm saving up so that each time I can afford another, I eliminate more draughts!
They aren't expensive for the quality, and always perfectly made and brilliantly packaged.
9 months ago
an excellent company to deal with

Service rating : Clare communication despite a re reschedule delivery and plenty of telephone advice before ordering.
Product : clear and concise installation instructions. The glazing panels were very well packed and arrived in pristine condition.
Following installation we have noticed a huge improvement in warmth and insulation, yet The secondary glazing is barely noticeable.
as these panels provide extra insulation for roof lights inside a sloped ceiling, extraglaze we’re able to supply wider magnetic strips for greater security.

James

More reviews

Extra news

How to Stop Condensation on Windows

Condensation on windows is a common issue faced by many homeowners, especially those with single-glazed windows. Understanding the root causes and implementing effective solutions can significantly reduce this problem. We'll explore how Extraglaze secondary glazing can help mitigate window condensation and provide practical tips for addressing the underlying causes.

Autumn Condensation: Why Your Windows Start "Sweating" as It Gets Colder

Waking up to windows clouded with moisture is one of the first signs that autumn has truly arrived. As the mornings turn crisp and the heating clicks back on, many homeowners notice water gathering along the bottom of their window panes, sometimes running down the glass in small streams.

This seasonal shift catches plenty of people off guard. The condensation that seemed to vanish over summer returns almost overnight, and it can feel like your windows have suddenly developed a problem. In reality, the change in weather is the trigger.

Secondary Glazing vs a Glass Upgrade to Double Glazing: Which Is Right for Your Home?

The Window Efficiency Debate

In the quest for energy efficiency and comfort, homeowners often find themselves at a crossroads: should they opt for secondary glazing or invest even more in upgrading their existing windows by swapping the old glass for some modern double glazing? Both options offer promise to improve insulation and reduce energy bills, but they are significantly different in their approaches and budgets. This guide explores the nuances of each solution to help you decide which is best for your home.