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^Boast post
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The first thing to do is plug any holes between the two rooms if they exist, after that it gets increasingly difficult/expensive. Ideally you want a floating false wall sealed around floor, ceiling and side walls, with a lot of mass and/or limp membranes included.
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Rockwool in the floor and wall cavities.
And block up the unused fireplace.
pifko
Dramatic_Hammer
handtightenonly
@deleted
Anyone got experience of soundproofing (a bedroom wall which has an unused fireplace in the middle)?