Each inner surface can support a ~10 mm layer of stationary air. This is what provides most of the insulation. So triple glazing will have four internal layers of air and will double the insulating value of the windows (assuming the units are 24 mm thicker). It doesn't need to be glass, there are some triple glazed units with a plastic film inner pane, they are lighter and thinner.
Triple glazing should allow bigger windows that still meet building regs thermal requirements.
It's been an option for ages. The more recent UK Part Ls for new homes require the calculated CO2 to be no more than that for a house of identical size constructed to a given spec. If you so choose you can use triple glazing to reduce your CO2 giving you a bit more slack somewhere else. Choosing triple glazing probably makes more sense on northern elevations as it cuts heat losses but also reduces solar gain and light transmission, both of which are factored into the CO2 calc.
Four???
|1 | | | 2| | | |3 | | | 4|
dennis maths.
Depends how you define "internal" in this context. If you mean "not outside the house", then you've got five. If you mean "internal to the glazing system", then you've got four.
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