I am working on redesigning a bedroom which has an awkward wall length because of a redundant chimney which takes up one corner of the room. However, instead of trying to knock through it as was my first thought, I figured building a 'fake wall' flush with it would be more beneficial.
The wall is neighbouring another bedroom and the plan is to make it an entertainment wall (tv, games consoles, etc) but my issue is the gap between the two walls when built. The distance between the original wall and the 'fake wall' is close to 17cm. There is no sockets/electrics on this wall but will be planning on adding some. I am unsure what would be best to soundproof/insulate this with as I haven't done anything with a gap this big.
Any advice would be greatly appreciated.