Does Double Glazing have a Vacuum?
Conventional Double Glazed Units – A Brief History of Insulated Windows
The best way to understand vacuum glazing and the reason it is becoming popular, is to put it in the context of traditional double glazing and the origins of the insulated window, and then to explore the differences. Traditional double glazing became popular in the UK in the late 1970s and early 1980s .The idea of having insulated windows to lower heating costs took hold in popular culture around this time and the technology advanced far enough to make double glazing affordable.
Conventional double glazing consists of two panes of glass separated by an insulating cavity. There are a lot of variations in double glazing thickness, cavity fill (typically it will be filled with a Noble gas to improve insulation), cavity thickness and spacer bar construction (i.e. the perimeter which keeps the two panes apart), but despite the differences all of these units count as double glazing units.
Single Glazed Windows
Prior to double glazing, all windows were manufactured with a single glass pane. Single glazing windows could lose as much as 60% of the heat inside a home, this is why you’ll find your home stays heated far more effectively once you have the double glazing installed. A double glazed unit also provides far better insulation against noise. Another benefit you’ll get from double glazing is that the glass helps to prevent the majority of condensation that you will typically see on single glazed windows.
So, what is Vacuum Glazing?
Vacuum glazing is very similar to a double glazed unit in construction, except that it doesn’t have a gas in the cavity, it has a vacuum. The vacuum makes a far more effective insulated window than any gas could, and therefore only requires a small cavity. There is no need to have a big, thick unit to deliver exceptional performance – the double glazing thickness is greatly reduced.