I'm planning to add some soundproofing between the ground floor and the loft before installing the ceiling drywall, and I'm looking for tips. The battens and interior walls are, as you can see in the picture, mounted, and now also the electrical conduits. Would you just lay insulation panels loosely on the battens, or try to get them up against the floor? What thickness, type rock wool 70 or 95mm?
It also depends a lot on the level of ambition. But the wood guide has good info on soundproofing in floors, something that is particularly important in apartment-separating floors.
If you are ambitious, you can fully insulate the floor with stone wool and complement under the battens with special acoustic profiles in metal, which allow the gypsum to hang fairly freely from the floor and prevent the worst vibrations. See construction example apartment-separating floors:
It doesn't have to be that ambitious and probably not fully insulated. Is stone wool significantly better than glass wool? Stone wool does have higher density, but it is also more cumbersome to transport from the building supply store.
Stone wool is heavier and thus provides better damping of quite a few frequencies.
But glass wool also offers good insulation.
I redid the ceiling in a "youth room" on the ground floor and chose somewhat thicker (I unfortunately don't remember the exact thickness) glass wool than was motivated (but the price difference for one room was marginal) and achieved excellent results. However, I had to install a doorbell in the room to attract attention in the room afterwards.
Structure-borne sound from the robot vacuum on the floor above unfortunately still travels down quite well. An acoustic profile would probably be a good solution there.
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