With the width of single glazing, vacuum glazed windows offer the same thermal insulation as their double glazed counterparts. The question is, how?
How Does Vacuum Glazing Work?
Unlike Dyson Hoovers, which frankly no-one apart from Jeremy Dyson understands, the mechanics of vacuum glazing is really rather straightforward. Instead of using air or other combinations of gas between the panes of glass, vacuum glazing instead employs a layer of nothing. With there being nothing between the glass, there is nothing to transfer the heat between the panes, and so it can’t go anywhere. Heat can’t go anywhere – room stays warm.
Of course, it’s still possible for heat to be transferred through the actual frame, though this is the same with double glazing. Rather, the use of micro spacers, a low emissivity coating, and specialist sealants ensure optimal efficiency.
Differences Between Vacuum Glazing and Double Glazing
In terms of energy efficiency, there are practically no differences. Vacuum glazing provides the same level of thermal insulation at a 0.2mm gap between panes as double glazing possibly could. So there’s no trumping there.
Instead, the incredible advantage of vacuum glazing lies in its relative thickness. Where most double glazing units will come to around 24mm, and possibly more, vacuum glazed units are around a third of the size at 6.5mm. This remarkable fact means that vacuum glazing is ideal for those who are looking to update their windows from single panes in conservation areas or listed buildings.
As we all know the regulations on changing anything about your property in one of these areas can cause a massive headache, and often this smallest details, such as the exacting dimensions of your windows and their frames, cannot be altered. With a much smaller thickness, it becomes a whole lot easier to design like for like replacement window frames which can accommodate the vacuum glazing, offering four times greater thermal efficiency compared to single pane units.
Other Advantages of Vacuum Glazing
Aside from the size difference, vacuum glazing also offers improved acoustic insulation. They will increase the value of the property itself, and with the energy saving you experience, will reduce those ever increasing heating costs!
Image by Hans