After much research it transpires that there are clever things called "resilient bars'" that you can fit to the underside of the joists before fitting the plasterboard ceiling. The idea is that the ceiling is 'de-coupled' from the joists above which means that the vibrational sound transfer is minimised as the ceiling is separated from the structure above.
The bars are also really useful for keeping the sound-deadening Rockwool in place which we fitted at the same time.
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| It may be sound-deadening but it doesn't half make you cough! |
Many thanks Mark for all your help.
The bars attach on one side only which create a kind of 'sprung ceiling' effect.
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