Double Glazing Leicester Looks Into Whether Or Not Triple Glazing Is Superior To Double. For years the indigenous window market in the UK has evolved on the proposition that bigger is better. The thickness of double glazed windows has varied over the years, from around 20mm to 24mm, and then settling on 28mm, despite 24mm being the ideal size for thermal capacity.
The depth of a window frame also went from a standard 60mm to 70mm, with no improved benefit, just the misunderstanding that the bigger something is, the better
But, is really triple glazing better than double? 3 works better than 2? (https://doubleglazing-leicester.uk). There’s no simple answer to this. As They Say, The Devil Is In The Details. To be able to properly answer this question, we need to take into account the personal aspects of a proposed Insulated Glass Unit (IGU).
The standard double glazing glass unit is composed of one 4mm panel of low emissivity glass, one panel of annealed glass and a 20mm gap of argon gas. (4mm, 20mm, 4mm)
This makes the center pane u-value of 1.1 W / kilojalores per metre squared. If we add a centre pane of plain glass but maintain the 28 mm thickness of the unit (i.e 4 -8 – 4- 8 – 4), we get a u-value of 1.2 W / kilojalores per metre squared which is a worse performance than double glazed. Although, if we add to the total thickness of the triple glazed unit by extending the cavities between the panes, we start to enhance the unit’s efficiency. The best thickness is 44mm (4-16-4-16-4), which will provide a u-value of 0.9 W / kilojalores per metre squared. We could enhance this more by bringing in a second “Low E” pane in which the unit u-value turns to 0.6 W / kilojalores per metre squared.
On the surface, going from 1.1 W / kilojalores per metre squared to 0.6 W / kilojalores per metre squared in terms of heat loss seems like something worth paying for
A widely accepted industry standard for measuring thermal performance and a part of Building Regulations, The Window Energy Rating Scheme judges heat loss as well as solar gain. What this mean is, the triple glazing windows increased head loss is canceled out by the reduced amount of solar light that can enter.
To solve this problem, and increase the solar light input, low iron glass can be used instead of the traditional glass used in practice, however, this will be a lot more expensive to use
There other elements that must be noticed by every triple glazing provider. This issue is related to the cracking of the units because of thermal stress. . The centre pane of a triple glazed unit does not have any air movement around it because of the encapsulation the temperatures can reach higher than can be expected for double glazing. . To correct this, use a toughened pane at the middle of the unit, this will unavoidably raise the cost again.
So the response to the initial question is it is possible to enhance the thermal efficiency of IGU by migrating to triple glazing. But another question comes in – at what cost? Energy costs are consistently rising by double-digit percentages year after year and it is a calculation, which must receive significant attention.
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