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@Airhead
I insulated a floor in a house at a time when building regs were introduced requiring it. At least I remember it being a thing for a while.
The matting fitted under the carpet was an inch thick. 2 layers of thick rubber joined by the kind of foam you get in sofas, mixed density though. It was effective at reducing noise from footprints but staircase noise still travelled through the staircase structure.
Double plasterboard underneath as well.
We were told a lot can be achieved with sand or any really dense material between the floorboards. Didn't like the idea of a lot of weight on the plasterboard though.
The whole building was owned by the same person and being renovated at the same time which made the solution practically possible but still very expensive and not fully acoustically insulated.
Never went as far as false lowered ceilings but apparently they work well enough if they're mechanical isolated in some way, there are systems for hanging acoustic plasterboard.