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  • Don't bother with the rubber acoustic matting stuff unless your budget is bottomless and you have low ceilings. The advice I've seen is put cement bonded particle board between the ceiling joists to add mass, seal it in to make it airtight, then hang a false ceiling off steel furring (2-3 layers of acoustic plasterboard with green glue between) and put dense rock wool in the gap between the two layers. Very diy-able with a board lifter!

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