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If noise is an issue then secondary glazing will be a big help and mitigate the noise even more than double glazing if you can have a minimum 10cm gap and glass of a different thickness than the outside pane, so 4mm old glass and 6mm secondary, it’s all about the length of the sound waves and how they get disrupted.
we have it with a big gap and while sound wasn’t a massive issue you really notice the difference in the background noise it cuts out.
@andos That is the best achievable outcome it seems yeah.
@EstelleGetty @Mr_Smyth To be honest, the main issue is finding good tradespeople to do the work. I was largely stuck with whatever the small number of available companies are willing to do. Consequently the only double glazed option on the table was the mock-multi-pane design which I agree isn't ideal compared to the other possible options suggested here.
The gripe is that this could all be spelled out by the planning offices to save all this bullshit. I suspect they will have to in the not to distant future if sustainable housing policy ever really kicks in.
I'm also somewhat wedded to double glazing because of noise issues with the property but I'm pretty much done with the place now.