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Energy efficient glass
The energy rating label runs from A-G with band E as the lowest level permitted for replacement windows. This generally requires a Low-E sealed unit.
Domestic extensions have to be band D or higher. This generally requires a Low-E Argon filled or warm edge spacer (Super Spacer or Enviro-TXN) sealed unit. New build can be up to band G, but only if the whole house meets other energy saving targets.
The Energy Saving Trust will allow the use of their logo for windows that achieve band C or higher. This generally requires a Low-E, Warm edge spacer and Argon filled as a minimum standard.
Low Emissivity Glass
Low – E glass is a vital component of energy efficient windows. It has a virtually invisible surface coating which operates as follows:-
• It allows heat from the winter sun to enter the home through the glazing.
• This solar energy works with domestic heating systems to warm up rooms, which then gives off long wavelength heat radiation.
• A large proportion of that wavelength heat would normally vanish back through windows made of ordinary glass. However, the Low –E coating reflects that heat back into the room, i.e. the coating traps the heat in the home, therefore making it a lot warmer during the winter.
Low – E glass not only meets the new Part L of Building Regulations it is virtually essential to enable you to achieve the new targets.
Low-E energy efficient glass
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