I'm looking to soundproof between bedrooms and bathrooms in my new house. Purpose to seperate master from kids, shower and toliet from kids bedrooms. Have sensibly located things to reduce what needs to be in/on the wall, have upgraded gib from 10mm to 13mm noiseline and planning to use internal batts.
However the issue is around electrcial boxes I need in the walls, any cheap ideas how to insulate them?
I've seen foam/putty pads online (youtube) you can install over boxes during framing but unsure about issues with fire codes and how effective they are. Anyone have experinece here and suggest cheap solutions?