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Triple Glazing - Is it worth it?
June 14, 2016
What is triple glazing?
Put simply, triple glazing is 3 panes of glass instead of 1 or 2. The claim is that by having an extra pane, you will increase efficiency and reduce noise. We already know that double glazing makes a significant improvement over single glazing, but even so upgrading from single to double glazing takes a long time to pay back in terms of energy efficiency. So would making the jump to triple glazing make that much of a difference?
Modern Double Glazing
As you may be aware, the energy efficiency of windows is measured with a ‘U-value’ and the lower this value is, the better.
Single glazing has a U-value of 5, older double glazing about 3 and new modern double glazing a U-value of 1.6, which is mainly due to improved methods of double glazing compared to older models.
These improvements have been made through optimization of the window cavity, the use of low emissivity coatings, using inert gas to fill the gap, and using aluminium spacers or ‘cold bridges’.
All this has brought down the U-value of modern windows considerably, so does that make triple glazing worth it, if double glazing is now so much better? Well, walls have a u value of around 0.3, so it is clear that windows have a long way to go before they are no longer a weak point in the efficiency of the building.
What's the rest of the world doing?
In Scandinavia, triple glazing is now pretty much standard, with modern triple glazing taking the U-value of the windows down to around 0.8.
Other reasons for getting triple glazing
Triple glazing can help reduce condensation on your windows.
Triple glazing offers a significant reduction in noise pollution – so it is ideal for those living in noisy areas.
Double glazing can create cold patches in the house, due to the higher u value of windows compared to walls and doors. This problem is exacerbated by modern insulation – as better and thicker wall insulation means windows become much colder compared to the rest of the house. Triple glazing is an excellent solution to this problem, as it reduces the difference in U-value between the windows and the rest of the building.
So triple or double?
The debate over triple or double-glazing is still raging, so I won’t tell you one way or another what is best for your property.
Whilst the benefits of triple glazing can be quite significant, for the best performance from triple glazing windows, we recommend using triple glazing to customers whom have triple glazing throughout their house.