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While closed cell foam will perform a bit better than fiberglass in noise reduction, there are much better ways to tackle this for the same or lower cost. What you really need for sound isolation is to add mass between the living units and to mechanically separate them. If both living areas are sharing a wall, building with double studs that are staggered ...


How big (in m3 not m2) is your bedroom? What I mean how much air is in there? I’m not sure that there is a danger that you will run out of air? Although it is a good thing to have source of fresh air.

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