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Secondary glazing is a form of double-glazing, however, unlike the popular sealed units that are common today, secondary glazing involves the introduction of a second glass pane, usually on the inside. The new window will be specially made to fit over the existing window to create a double-glazing effect. As mentioned the secondary glazing will be usually be installed on the inside, so there should be no impact on the external frame.
The effects of secondary glazing are the same as sealed unit double-glazing. The secondary window creates a barrier to heat and sound. It provides extra insulation to keep the room warm in winter and cooler in summer. It also provides an extra level of security over sealed units as it is in effect two separate barriers for would be intruders to negotiate, whereas a sealed unit is really a single entity with one frame in contrast to secondary glazing where there are two separate frames.
There is nothing to stop secondary glazing from being installed over sealed units to create effectively tripe-glazing. Secondary glazing is particularly appropriate in older buildings where the need to retain original features is paramount. Indeed, some buildings may be listed and so it is not possible to install replacement windows.
Secondary glazing is ideal for adding an extra level of efficiency to existing windows that are in good condition and therefore uneconomic to replace. If there is a need to improve heat and sound insulation to a property then secondary glazing can make an excellent cost effective solution.