The combination of the additional pane, dual airtight cavities and warm edge spacers help achieve this lower U-value by further reducing thermal conductivity across the panes, meaning less heat is lost. Some installers say triple glazed windows are as much as 40 per cent more thermally efficient than standard A-rated double glazed windows, and 60 per cent more than C-rated double glazed windows. Triple glazed windows have a U-value of around 0.9W/m²k (watts per square metre kelvin), compared to double glazed windows, which have a U-value of roughly 1.2/1.4 W/m²k. Thermal efficiency is measured in U-values and a lower reading is better for homes. One of the best benefits of triple glazing is thermal efficiency, which is why they’re generally used for Passivhaus and other eco home designs. There is some debate around whether that third pane beats double glazing in terms of combating noise pollution, but when it comes to higher thermal efficiency, better security and lower energy bills, triple glazing is the winner. There are more pros than cons with triple glazing windows, notably in how energy efficient they are. Manufacturers will also ensure the panes are fully sealed to prevent possible condensation. The material these spacers are made from depends on the supplier, but typically they will be made from uPVC or another thermally optimised insulating material that doesn’t conduct heat. Triple glazed windows are usually built using warm edge spacer bars (also known as a thermal spacer bar) between the panes, which further insulate the entire unit. The two airtight cavities of triple glazing allow for two compartments of inert gas, such as argon or krypton, for superior thermal conductivity they transfer heat at a slower rate than double glazing, which features just one cavity. The additional internal pane between the two outers is usually a strengthened, low-iron glass. The inner and outer panes will be typically low emissivity (low-E) glass, which has a metal oxide coating for minimising solar gain, to keep the house cool in summer, and maximising heat retention in winter. (Image credit: Adobe)Īs the name suggests, triple glazed windows consist of three panes of glass, rather than two, as you find with double glazing. Just as with double glazed windows, triple glazing can come in timber, uPVC and aluminium frames to suit specific styles, budgets and maintenance levels.
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