Choosing your windows

Selecting the quality of window frame.

A window frame does not form part of a double glazing window .

Rather, the double glazing window is positioned within a frame. Care should be taken in selecting the quality of window frame used as it will affect the insulation properties of a double glazing window by up to 30% and thus its double glazing window Energy Rating. The most widely used frame materials are timber, aluminium and PVC (a plastic derivative). Under Document L specifications, all new or replacement windows (including frames and double glazing window) should have a U value of no higher than 2.0 W/m 2K.

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