| 30cm thick brick wall are not bad to start out. I think there's not much sound coming through that, the bigger problem is vibration transmitted by the walls and floor. I'd try to make the walls floating, i.e. with as little contact with the brick walls as possible. You could just build a rectangle of wall inside the existing room and stuff a little rock wool between the the new all and the old wall. Or you can just leave air inbetween and use the rock wool to build lots of bass traps. |