Wooden Sliding sash windows, casement windows or even modern windows are one of the worst parts of a building for noise infiltrating due to their lightweight construction and lack of density.
A typical single glazed window without any draughtproofing seals will only achieve a reduction in noise of around 18 Dba, a secondary glazed window with an air space of around 100mm or more de-couples the movement of the two panes of glazing and reduces the resonance between the inner and outer panes of glass in the window opening.
This can achieve a dramatic reduction in sound that can pass through the window, a sound insulation of up to 45dBA can be expected, even higher levels of sound reduction can be achieved as the gap increases up to a maximum of 200mm beyond this range the improvements in noise reduction are very minimal.
If you wished to achieve even greater reduction in the noise that is transmitted through your windows you can opt for the thicker 6mm noise reducing glass.
To give you an idea of how noise levels are measures a drop of 10 decibels would roughly be cutting the sound in half that you could hear depending on its frequency, this is a very rough guide but it gives you some understanding of what can be achieved in noise reduction.
This is an example of what decibels actually relate to, this will give you some understanding of decibels and the reductions you may be able to achieve.
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