Double gyprock Vs insulation???
I having a builder put up a couple of interior walls in an office space. Sound proofing is important so we added sound batts to the walls. One of the interior walls(3m high 8m long) was existing and had no insulation. Is it better to just add another layer of gyprock or take off one side and add insulation before re-plastering??? Obviously the second option is more expensive but will it be a lot more sound insulated having 2 layers of gyprock and insulation vs 3 layers of gyprock????
Secondly, how much sound travels over the wall through the ceiling. I have those plasterboard tiles with about a 900mm cavity in the ceiling. How important is it to insulate the ceiling cavity??
Thanks