By agreeing to the Kyoto Treaty, the Government has committed to take steps to reduce the amount of  greenhouse gases the UK produces. One of the measures introduced to meet the targets has been a change to the Building Regulations, setting out strict energy efficiency requirements for buildings. Known as 'Part L' in England and Wales and 'Parts J & A' in Scotland, the new regulations affect the majority of replacement windows and windows in new structures fitted after April 2002.
 

Pilkington K Glass, which usually forms the inner pane of a double glazing unit, allows less heat to escape through your windows than ordinary glass - thanks to a special energy saving coating which lets the sun's rays through, but reflects heat from fires and radiators back into your home. Heat which ordinary double glazing allows to escape.

The glass in your windows absorbs heat then radiates it again on the colder, outside, surface. Pilkington K Glass has what is called a low emissivity coating on the surface that faces into the gap of the double glazing unit.

Low emissivity means the coating is a poor radiator. The heat absorbed by the coated glass is inhibited from radiating across the air gap and then from the outer pane to the cold outside world. Instead the heat is reflected back into the room by the coating, which works in a similar way to a sheet of reflecting foil placed behind a central heating radiator bouncing the heat back into the room.

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