It's a bitch and mass is your friend. Once you've done it you will hear sound travelling through the walls and staircases etc.
I've done it for building regs with double plasterboard underneath and rubber mats with foam cores above. You can also get an insulation with rubber matting woven in it which is eye-wateringly expensive.
This is indeed what my friend the consulting engineer told me. There are many soundproofing systems, it seems, all variants on some kind of composite board with a layer of damping. The hard bit is to get the owner above to fetch in his pocket and do the right thing.
It's a bitch and mass is your friend. Once you've done it you will hear sound travelling through the walls and staircases etc.
I've done it for building regs with double plasterboard underneath and rubber mats with foam cores above. You can also get an insulation with rubber matting woven in it which is eye-wateringly expensive.