What are triple glazed windows? Understanding triple glazing

We’re all aware that double glazed windows offer significant performance improvements over single glazing, but does the prospect of having three panes of glass instead of two make an even bigger difference?

Triple glazed windows are now very much the norm in Scandinavia, where the arctic climate demands the most energy efficient windows. It’s said that modern triple glazing can reduce the U-value of a window to just 0.8. When you consider that single glazed windows have a U-value of 5, it’s not hard to see why the vast majority of new-build properties in this region feature triple glazing.

At present Building Regulations insist that any window installed today should have a U-value no worse than 1.6. Triple glazed windows offer the best heat retention properties and warmth of any of our frames; making them ideal for north-facing windows. The extra pane better reflects the sun’s rays inside, making homes warmer and reducing energy bills.

Additionally, low-emissivity coatings are now being applied to glass panes to stop heat escaping; and even cavities are being filled with argon gas to minimise heat loss.
Triple glazing tends to work best in rooms where a number of small or medium-sized windows are required over a large area, due to the way in which it outperforms double glazing in terms of U-value. So for property owners desperate for a sleek, sophisticated glazing treatment inspired by Grand Designs-esque homes which encourage abundant levels of natural light into their properties, triple glazing could certainly be right for you.

Ideal for passive house projects


If you are in the process of constructing a passive house – one which provides a consistent, comfortable temperature all-year round – triple glazing is essential. With triple heat protection glazing, it’s possible to achieve U-values of 0.7, insulating against drafts using thermal bridges both at the glass edge and in the connecting space between the window and the wall.

At Livingwood we have vast experience in supplying certified products for Passive House projects.

Triple glazing can also provide a significant reduction in noise pollution; so if you live in a busy urban area this could be a suitable option to minimising the impact of external noise.

Triple glazing versus double glazing

Do bear in mind however that if you own a period property, double glazing would be adequate in comparison to triple glazing. Simply due to the overall thermal properties of the existing dwelling. It only makes sense to improve to triple glazing if you are going to vastly improve the insulation of the period property. So you’ve got to weigh up the ease of installing double glazed windows with the energy savings of triple glazing.

It’s also important to note that any double or triple glazing is only as good as the materials used and the quality of the installation. Poorly-fitted triple glazing leads to the same energy performance as single glazing and performs far worse than high-quality double glazing featuring low-iron panes.

At Livingwood Windows we offer standard, double or triple glazing to suit the needs of your individual project. With low-e coating float glass, our double glazed units achieve a centre pane U-value of 1.0, while our triple glazed units can achieve centre pane U-values as low as 0.6.