Installation wall without insulation?

[MoggeS]

In the process of a major renovation of a house from '38. Exterior walls of cavity wall (brick), no moisture problems at present.
The previous owner filled the cavity wall gap with polystyrene beads in the '80s.
I would like to create a service wall with drywall on the inside and the question is how it should be done, as I do not want to add any insulation since I might move the dew point into the wall. The problem if I don't use insulation in the "service wall" is the sound, which I fear might become an issue - or? It will be hollow walls...
Has anyone done anything similar?

 

[justusandersson]

Where would that sound come from? Sounds from outside are likely handled relatively effectively by the wall. Against low-frequency sounds in the room, a membrane absorber made of gypsum can be quite effective.

 

[Rabbithole]

The foam beads do not form a diffusion-tight layer, so you can add insulation on the inside with plastic.

 

[MoggeS]

Where would that sound come from? Sounds from outside are probably handled relatively effectively by the wall. For low-frequency sounds in the room, a membrane absorber made of plaster can be quite effective.

I don't have any problems with sounds from outside, it's potential structure-borne noise that I'm worried about. But the plaster itself might be sufficient.

 

[MoggeS]

The polystyrene beads do not form a diffusion-tight layer, so you can insulate the inside with plastic.

Since I currently don't have moisture problems, insulating the inside with plastic seems like a less favorable option. Living by the sea means driving rain against the facade is an everyday occurrence. If I insulate the inside, the brick wall (plastered) becomes colder and has more difficulty drying out.

 

[justusandersson]

I advise against using plastic on the inside. Insulate any wooden frame with paper so it doesn't rest directly against the brick wall. Absolutely no problem with drywall without underlying insulation.