Fife Windows & Doors

Also known as the K-value, the U-value is a measure of a window's ability to transfer heat (usually given in W/m2K). Windows with a low U-value, like Low Emissivity windows, are efficient insulators against heat loss & have a better level of performance. Scotland got its own new Building Standards on the 1st March 2003 with the full implementation of Part J. The current U-value is 1.8, for windows made of plastic or wood.

Technically known as a low Emissivity, or Low E glass. This glass varies from normal clear glass in that one side it has a microscopically-thin coating of metal oxide. Low-E glass is a type of insulating glass, which increases the energy efficiency of windows by reducing the transfer of heat or cold through glass. The coating reflects radiant infrared energy, thus tending to keep radiant heat on the same side of the glass from which it originated.