Key Product Features
KJM in Andover Hampshire offer’s both 40mm and 44mm triple glazing for the very best in heat insulation in your triple glazed windows. Using Pilkington S1 soft coat (x2) and float glass, argon filled with a 16mm Swisspacer Ultimate warm edge spacer the glass achieves a centre-pane U-value of 0.5.
A similar sealed unit with 14mm spacer bars will give a centre pane u-value of 0.6. The Sheerline Prestige, Residence 9 and Residence 7 flush casement window systems can house a 44mm triple-glazed sealed unit.
Andover & Hampshire
Are triple glazed windows worth it?
If you are thinking about replacing your windows or doors, then you should consider KJM’s range of triple glazing. Whilst it’s true that some triple glazing is not better than some double glazing, it is all about the specification of the glass and the gaps between the panes. Generally speaking the most thermally efficient sealed units will have a gap between 14-16mm.
When looking for argon filled triple glazing, the gaps between the glass should ideally be no more than 14mm-16mm, if it is smaller than that, the thermal efficiency may be lower than double glazing. We can offer five triple glazed systems: Sheerline aluminium, Deceuninck, Profile 22 and both the Residence 7 & 9, choose from their 40mm or 44mm thick units to provide the best insulation in the market. Alternatively, visit our gallery to view installed units for your comparison.VISIT OUR GALLERY
What is the u-value of triple glazed windows?
Building regulations are becoming more stringent regarding thermal efficiency. The method of comparing the energy performance of windows is to use the U-value, as used when comparing walls, roofs and floors. Over time U-values in windows have dropped. When we only used single glazing, windows had a U-value in excess of 5.0 W/m2K, early double glazing reduced this figure to 3.0, but over the years the U-value on double glazed units has dropped to around 1.1, with the introduction of warm edge spacers, argon gas and low-e glass.
Actually the best double glazed unit manufacted from Pilkington S1 glass with a 16mm argon filled gap gives a centre-pane value of 1.0. 44mm triple glazing offers a centre pane U-value of 0.5. This type of window offers a centre pane u-value of 50% better insulation than our “A” rated double glazing. It is in most cases over 25% better insulated than our rivals 36mm triple glazing. We can also offer 28mm triple glazed units (2 x 8mm gaps) filled with krypton gas and 3 layers of 4mm glass (as our 44mm system), which achieves a centre pane u-value of 0.60.
We offer this smaller unit because some of our range cannot accept the wider 44mm units and some of our customers prefer the bead detail on the 28mm system. Krypton gas works better on smaller air-gaps than argon, but is MUCH more expensive than argon filled units. Either way KJM can provide a triple glazed unit to suit your requirements.CONTACT US
Andover & Hampshire
Triple glazing manufactured with the Swisspacer Ultimate
Widely regarded as “The Ultimate Warm-Edge Spacer”, the Swisspacer Ultimate sets a new benchmark for spacers in energy efficiency, comfort and dimensional stability. This spacer bar improves on the previous Swisspacer V by 20%. Being a strong and rigid structure, they are ideal for triple glazed units to stop moisture getting in and insulating gas getting out.
When its really cold outside, and the internal air temperature is at 21°C, a triple-glazed window, with a centre-pane U-value of just 0.5, will create internal surface temperatures of 18°C. Other advantages our triple glazing offers include improved security due to the extra pane of toughened glass and incredible sound insulation for your home.LEARN MORE
Andover & Hampshire
Save Energy with Triple Glazed Windows
Triple glazing is widely used in cold climate countries like Sweden and Norway and has been for some time. The physics of triple glazing have been worked out in Germany by the PassivHaus Institute. It has shown what happens to the internal surface temperatures on various forms of glazing when its really cold outside, and the internal air temperature is at 21°C:
- A single-glazed window, the internal surface temperature is around 1°C.
- A typical double-glazed window fitted 10 years ago the surface temperature is around 11°C.
- A modern, energy-efficient double-glazed window, the surface temperature is 16°C.
- A triple-glazed window, with a centre-pane U-value of just 0.65, the temperature is 18°C.
Improved security over double glazed windows, due to the extra pane of toughened glass. Internally glazed windows offer added security and prevents the removal of the glass from the outside.
There is no major gain having triple glazing with three equal thicknesses of glass. The best solution would be with a thicker centre pane, please enquire for further information.
44mm sealed units filled with two 16mm cavities of argon gas. Argon gas is heavier than air, so acts as an insulator
Warm edge spacer bars made from a composite material to stop the cold-bridge across the unit.
Two coatings of low-emissivity glass (Low E). This is a microscopically thin coating that stops the heat from your house going outside.
Triple Glazing Prices Andover & Hampshire
Triple glazing can be more expensive than double glazing, but as a comparison, they do not add much more than 25% to the double glazed costs typically found around the Andover and Hampshire areas. This would work out at about £150 on an average size window.
While we can offer a rough price for our triple glazing, we would happily provide a complete bespoke quotation for our glazing services and installation. Contact us using the online contact form; our friendly sales team will gladly help.
Frequently Asked Questions
Will installing triple glazed windows cause overheating in the summer?
This is a common misconception, the level of solar gain is actually less than a double glazed unit due to the extra pane of glass and cavity. The overall energy balance of a triple glazed window will ensure that more heat is retained in the room in the colder months of the year.
This can cause a small problem in the winter months as the external pane of glass is not being heated from the house and this will result in external condensation in certain conditions. This will generally happen on a cold, clear and still winter’s nights and will normally clear quickly in the morning.
Are triple glazed windows worth it?
The cost of triple glazing is obviously more than double glazing. The u-value of a triple glazed window with the correct spacing between the panes of glass and argon gas offers up to a 50% improvement over A rated double glazing. If you are replacing your windows, building a new house or an extension then it is certainly worth considering.
The truth is it would take many years to repay the additional cost, but it will help save on your energy bills immediately and some would argue it would make your house more attractive to potential buyers if you decided to sell it. Houses in the UK have to have an energy performance certificate when being put up for sale.
How much do triple glazed windows cost?
As a rough guide triple glazing will cost on average around £150 extra per window over double glazing, based on one square metre of glass. This would be the average window size of a 1.2m square (4ft) UK window as it would have around one square metre of glass.
Are triple glazed windows better than double glazing?
Good quality triple glazed windows are up to 50% more thermally efficient than ‘A’ rated double glazed windows, so you would see an immediate effect on energy savings. If you home has older double glazed windows or even single glazing then the improvement would be huge, as an example the u-value of a single pane of glass is 5.5, the u-value of a 44mm triple glazed unit is around 0.5. This would considerably reduce condensation on the internal face of the glass and cold spots around the window and in your room.
What do triple glazed windows do?
For a long time windows in the UK were single glazed, in the 1980’s double glazing really took off. Back in the day the best double glazed window had a u-value of around 3 w/m²k. The glass units were made of two panes of normal glass with a metal spacer holding them apart. Triple glazed windows have changed the thermal performance hugely.
Today, the units are manufactured with three panes of glass, two of them will have a low-e coating, the gaps between the panes are filled with an inert gas commonly argon. Finally the triple glazed unit will have two warm edge spacers that stop cold transferring through the edge of the glass. This will normally reduce the overall whole window u-value down to less than 1 w/m²k. Do remember all triple glazing is not the same, generally with argon filled units, the gaps between the panes should be 16mm, any smaller and the efficiency will be less.
Are smaller triple glazed units available?
We can offer 28mm triple glazed units (2 x 8mm gaps) filled with krypton gas and 3 layers of 4mm glass, which achieves a centre pane U-value of 0.50 W/m2K. We offer this smaller unit to accommodate for the smaller units that we offer and for our customers who prefer the bead detail on the 28mm system. Krypton gas works better on smaller air-gaps than argon, but is MUCH more expensive than argon filled units. Either way KJM can provide a triple glazed unit to suit your requirements.