Triple Glazing
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Triple Glazing

Triple Glazing - Triple Glazed Windows

Triple Glazing and Triple Glazed Windows for enhanced energy saving. To further minimise the heat loss through your glass, there is ‘triple glazing’. This means reduced heat loss and less heat input, so reduced heating bills. Your 'feel good' factor is enhanced in that you know you are doing all you can to reduce your carbon footprint, so helping save the planet.

 Bit by bit, we are being encouraged to switch from double to triple glazing. You may not have noticed yet but the pressure is on to improve the energy performance of windows and we are now reaching the stage where mere double glazing will no longer be enough. The rough and ready method of comparing the energy performance of windows is to use the U value measurement, just as we do with walls, floors and roofs. Traditional windows, with a single pane of glass in them, have a U value in excess of 5. Double glazing used to score over 3, but, over the years, the manufacturing process has undergone a number of improvements and currently the Building Regulations insist that any window you install today should have a U value no worse than 1.6.

These improvements have been brought about by the introduction of: Wider cavities between the two glass panes 16mm is the optimum distance Low-emissive coatings being added to the glass to stop heat escaping The cavity being filled with an inert gas, usually argon Designing out cold bridges, such as aluminium spacers, surrounding the glazed units Now, a U value of 1.8 may look good when compared to what we have been fitting relatively recently, but compared to the U value demanded for walls – currently less than 0.3 and due to fall even lower – you can see that windows remain weak spots in the overall thermal efficiency of a building envelope. Hence the tremendous pressure to improve their performance even further.

Should we switch to Triple Glazing?

Opinion is divided. Triple glazing is widely used in cold climate countries like Sweden and Norway, and the ultra-low energy PassivHaus standard requires triple glazed windows with a U value of no more than 0.8. To get a window with such a low U value, you have to not only switch to triple glazing but also insulate the frame itself, as well as using more expensive manufacturing techniques — the gas krypton tends to be used, instead of argon.

Now, though a U value as low as 0.8 sounds very impressive, the additional energy we are saving is minuscule whilst the payback time for triple glazing (like double glazing) is high compared to other energy-efficiency improvements. But there is a little more to it than this. 

The key benefits are really to do with comfort. If you insulate the walls, roof and floor of a house, and you ignore the glazing, you end up with cold spots surrounding the windows at night, which cause draughts, draw heat away from you if you sit next to them, and result in streams of condensation running down the panes. So, in essence, the standard of glazing has to match the standard of the insulation elsewhere in the house, so that the warm wrapping around the house performs consistently.

- See more at: http://www.homebuilding.co.uk/advice/key-choices/green/triple-glazing#sthash.AyNQo244.dpuf

Now, though a U value as low as 0.8 sounds very impressive, the additional energy we are saving is minuscule whilst the payback time for triple glazing (like double glazing) is high compared to other energy-efficiency improvements. But there is a little more to it than this. The key benefits are really to do with comfort. If you insulate the walls, roof and floor of a house, and you ignore the glazing, you end up with cold spots surrounding the windows at night, which cause draughts, draw heat away from you if you sit next to them, and result in streams of condensation running down the panes. So, in essence, the standard of glazing has to match the standard of the insulation elsewhere in the house, so that the warm wrapping around the house performs consistently.

 Which is where triple glazing comes in. Because if double glazing makes a modern house more comfortable to live in, triple glazing makes it even more so. The physics involved here have been worked out in Germany by the PassivHaus Institute. It has shown what happens to surface temp­eratures on various forms of glazing when it gets really cold outside, and the internal air temperature is designed to be at 21°C: Next to a single glazed window, the internal surface temperature is around 1°C. Next to a double glazed window (2000 vintage), the surface temperature is around 11°C. Next to a modern, energy-efficient double glazed window, the surface temperature is 16°C. Next to a triple glazed window, with a centre-pane U value of just 0.65, the temperature is 18°C. So you can see that whilst a double glazed window is perfectly adequate, a triple glazed one is just that much more comfortable, because it hangs onto heat just that little bit better. So whilst triple glazing may make little difference to your heating bills, you will notice the difference inside the house. The PassivHaus standard promotes the use of triple glazing for precisely this reason – i.e. comfort – although it also states that the frames themselves have to be insulated, and the windows need to be mounted in the correct location within the wall assembly

Triple Glazing
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Email us at: enquiries@pdgeerewindows.com or click here to contact us via our enquiry form.
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We cover most areas including: Aldershot, Farnborough, Fleet, Guildford, Camberley, Bagshot, Blackwater, Bracknell, Church Crookham, Farnham,
Finchampstead, Crondall, Frimley, Hartley Wintney, Hook, Mytchett, Normandy, North Camp, Odiham, Sandhurst, Knaphill, Pirbright, Chobham, Ash, Ash Vale, Ascot, Hartley Wintney, Windsor, Weybridge, Esher, Bordon, Ewshot, Bisley, Worplesdon, Send, Crowthorne, Seale, Brookwood, Woking, Wokingham and Tongham.
We also cover the whole of the London area plus the following counties: Surrey, Hampshire and Berkshire. Please do still contact us if your area is not listed here
Office: 01252 337466 Mobile: 07971 534454
Email: enquiries@pdgeerewindows.com
Lynton, Horseshoe Lane, Ash Vale, Surrey GU12 5LJ