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Our current windows is already good at reducing the noise, and it’s not on the main road, the only kind of noise might go through is those who’s in the car appreciation thread.
If noise is an issue you can get acoustic laminated glass which could replace the single glazed sliding sash. You'd probably need some extra balance weights as it's about 6mm thick, rather than your standard 4mm (maybe 3mm)
With replacement double glazed windows, 4mm glass, 20mm air gap and 4mm glass is the norm. A fairly effective and not particularly expensive option would be specifying 4,18,6. Being different thickness/weights, the two panes vibrate at different frequencies and transmit less noise.... you can even get the acoustic laminated incorporated in to a double glazed unit.
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user69121
Our current windows is already good at reducing the noise, and it’s not on the main road, the only kind of noise might go through is those who’s in the car appreciation thread.