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I think what the OP is talking about is reducing noise transfer from one floor to another, in which case cork would be effective to some degree if it's thick enough. I'm assuming you mean a cork layer between the floor and the joists, of course. You could also fill the cavities between the beams in the ceiling with mineral wool or rigid fiber glass and that would give you a bit more reduction.
To really do it right would require a near total rebuild of the ceiling/floor though. As the other posters have stated already, you'd need to add mass and incorporate decoupling techniques to have any profound effect.
Frank
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Frank
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