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There are many reasons why would you put Rockwool between walls.
In this case, Rockwool behind the walls has a very simple task - to prevent cement from falling down, piling up at the bottom of the wall and creating a "short circuit" between walls and/or structural floor. Once it hardens, cement can seriously reduce the isolation characteristics of the floated wall. The distance between walls is only 5cm, and it is absolutely necessary to keep them completely separated.
Syncamorea, Tiago and adassumpcao, thanks, counting with you guys for the opening party!
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