So What About ‘Secondary Glazing’?
Secondary glazing fits a second sheet, usually perspex, to the inside of an existing window, typically held in place by magnets. We can have a long discussion on the subject, but in essence…
- secondary glazing does not replace an unsuitable existing window pane
- thin existing glass is a poor insulator of heat and sound
- being limited by the frame, secondary glazing does not provide the exact gap needed for best performance
- secondary glazing provides no vacuum gap between the two sheets
- with secondary glazing, the gap between the sheets is filled with air- a poor insulator
- with genuine double glazing, the gap is usually filled with argon gas- a superior insulator
Secondary glazing is an improvement on an existing window, but it just can’t perform like real double glazing.
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