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My knowledge on soundproofing is limited.
I know the secret is decoupling (floating boards and panels on silicone or similar), increasing surface area (acoustic rockwool type stuff), and not leaving any gaps.If you’re interested I’ll get product names from my mate.
absurdbird-
Yes please! We've used Soundstop before and were happy, and I trust their advice, but I've also found somewhere that sells the rubber panels cheaper than they do and am open to ideas.
As I understand it the rubber panels are heavy so have the mass and required properties needed to absorb noise. The plasterboard is then glued to the rubber which isolates it from the wall. You leave a 3mm gap around everything to decouple which you then fill with acoustic mastic. I'm also thinking about using a layer of green glue between the two layers of plasterboard but not 100% sure that will hold the plasterboard up, you need something which is going to hold heavy panels to the wall/rubber panels/plasterboard.
Fox
Thanks, very amateurish compared to your work but given the hard deadline plus doing stuff all new to me probably the most challenging DIY I've attempted so far.
Looking at M20 rubber panels + two layers of acoustic plasterboard - this basically:
https://www.soundstop.co.uk/soundproofing/soundproofing-walls/Sm20-wall-solution4.php
Our house/area is really really quiet but that's part of the issue - the first floor front bedroom will be our room for TV watching so we're more worried about noise from us than from our (very quiet, very considerate) neighbours. But loud conversations/sneezes can be heard through the first floor walls so we're thinking of this as future proofing.
When I ran the ethernet cables I discovered there's a step from the ground floor to first floor walls and the first floor rooms are effectively slightly wider, so I think it's perhaps double skin brick downstairs and single up, in which case God knows what's holding our loft extension up!
Yep, have been impressed by videos/reviews of Loctite 55 but if that doesn't work I'll pick up some Slic-tite!