Secondary glazing acoustic performance

Secondary glazing is particularly useful when replacement windows are not suitable for your property and is ideal for homes that are traditional, listed buildings, in conservation areas or just don’t need replacing. The slim aluminium frames are strong and durable providing many years of service. We install secondary glazing across Hampshire, Wiltshire, Dorset, Berkshire & Surrey, we also offer a "supply only" self-fit option.

Secondary glazing involves adding an extra slim-line window to the inside of your existing window, KJM’s units are manufactured in the England from strong lightweight aluminium, that can be directly fixed to the existing windows, or manufactured with a sub-frame to allow for either reveal fixed or face fixed. The wood used for the subframe is either MDF (medium density fibreboard), Luan (dark hardwood) or Tulip (pale hardwood). The optimum gap to reduce heat loss and keeping external noise to a minimum is 100mm between the secondary glazed unit and your existing window (glass to glass). However, this would normally mean that little or none of the internal cill would be left. Changing the thickness of the glass between your existing window and your new secondary glazing will change the frequencies of the sound wave length and reduce noise further. i.e. Existing window glass 4mm - install secondary glass 6mm.

For an even better thermal performance, you can specify Pilkington K low e glass and for extreme situations we offer a heavy duty system that can take a double glazed unit.

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