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That sounds like a good system.
My friend probably was going for a more economic solution as he had an industrial unit to sound proof - also the amount of lost space wasn’t as much of an issue as it would be in a house.Other mates of mine built a couple of screening rooms for the cinema film processing place in Soho. They literally built it out of silicone, crates and crates of the stuff - everything was floated on it.
I reckon the green glue is superior but it’s not £2 a tube.
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.