All About Double Glazing

Windows make a major contribution towards the character of historic buildings and every effort ought to be made to retain them. They could also reveal a good deal about the history of a structure; changing architectural taste and style, social hierarchy, building economics, craft skills, and industrial advances.

Older windows may well be draughty as eventually, they distort as joints become stressed. Although adequate ventilation is essential in older buildings extreme air leakage through windows wastes heat and is miserable for occupants.

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Carefully planned and installed secondary glazing allows the original windows to be preserved unchanged, and where necessary repaired, whilst reducing air leaks and conducted heat losses. Consequently, there isn't a damage to historic fabric as well as in most instances the installation is easily reversible.

A recent study has revealed heat losses by conduction and radiation through a window, generally speaking, can be decreased by over 60% by making use of secondary glazing with a low emissivity (low-E) hard coating facing the exterior. The research has also shown that further savings can be made if the secondary glazing utilizes insulating frames or uses double or vacuum glazed units.

In addition to increasing the thermal performance of windows, secondary glazing can have a number of additional extra benefits including being highly effective at limiting noise transmission.

For listed properties, it is important to refer to the Conservation Officer at the local planning authority for guidance ahead of the installation of secondary glazing. Listed Building Authorization may be required in some cases.