Triple Glazing In The UK

In the United Kingdom, triple-glazed windows are a fairly recent idea. However, in colder nations like Scandinavia, where dwellings are subjected to harsh winters, they have long been a typical feature. While we may not have the same level of extreme weather, the UK still has severe winters and, of course, rising energy bills. You should also keep in mind that while there are various options to insulate your house, such as the roof, walls, and floor, failing to insulate your windows might lead to cold areas and dampness. In today’s blog, we are going to discuss whether triple glazing is worth the money and how it compares to double glazing

Triple Glazing Compared To Double Glazing

Put simply, triple glazing is an additional pane of glass installed over a double glazed unit. This, meanwhile, improves performance in a variety of ways:

  • Triple-glazed windows often receive the highest energy efficiency rating of A++.
  • If the same layer of glass is utilised throughout, sound insulation is somewhat enhanced over a double glazed unit.
  • The second pane adds to the protection of the window’s glass component. Normally, the centre pane is hardened.
  • In order to limit heat transmission, the extra pane requires an added spacer bar at the glass’s border.
  • The additional pane of glass acts as an additional barrier against the chilly winter weather, keeping your house warmer.


There are several advantages to putting triple glazing in your house, but keep in mind that not all triple glazing is created equal. There are a variety of methods offered, but for the best results, the gaps between the glass panes should be 16mm and filled with argon gas. Argon is an inert gas that helps to keep heat from escaping through the windows. If the space is narrowed, the sealed unit’s heat performance suffers, unless you employ a costly gas like krypton. So, in principle, a triple glazed sealed unit should have 4mm glass and 16mm gaps, which is referred to as a 4/16/4/16/4 unit in our business, and totals 44mm. When comparing the u-values of the glass, the difference between a 44mm triple unit and a 28mm double glazed unit is significant. The 44mm unit’s usual center pane u-value is 0.62, whereas the double glazed unit is 1.1.

Disadvantages Of Triple Glazing

The most serious issue with triple glazed windows is outside condensation on the glass. This occurs because your home does not adequately heat the external pane of glass, so if the glass cools below the temperature of the outside air, you approach “dew point” and condensation develops. It’s for this reason that dew forms on your car windows. It usually happens after a chilly clear sky and is accurately characterised as a light mist that originates from the centre of the glass, despite the fact that it occurs on the inside in the exact opposite location. This is due to the fact the glass is warmed in impact through the framework and spacer bar, thus the outer border is warmer than the centre. Internal condensation occurs in the opposite direction, because the outside edge of internal glass is the coolest.

If you have any questions regarding triple or double glazing then do not hesitate to get in touch today!