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More detail:
Start by wrapping the inside of the walls with fairly dense 10mm neoprene to the eventual height of the floor. The floor should butt up to this, but not compress it.
The layers from the bottom are:
50mm RW6 Rockwool (around 100kg/m3 from memory)
18mm plywood
18mm plywood
50mm concrete paving slabs (use dry sand to fill any gaps and skim for a smooth surface)
18mm plywood
10kg/m2 barrier mat
18mm plywood
Then finish with your (solid, not 'engineered') hardwood flooring of choice.
All layers (other than the Rockwool, but including the final 'show' flooring) should be glued together and screwed at 100mm intervals in both directions so the whole thing is rock solid. Make sure that the gaps in the boards overlap from one layer to the next.
I have a railway track about 20 yards from my studio and passing trains are pretty much undetectable now (and the soundproofing holds up!).
You didn't say what this is for either - you really don't need a floating floor in the control room - it's much easier just to isolate the speakers. But if it's for a live room where you will be doing drums/amped instruments etc, then well worth it.
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