Tips
Isolate all pipes from framing and drywall with resilient mounts or hangers to create dead air chambers. Then wrap NetLag around your pipes and apply your sheetrock. If any of these walls are to be insulated for temperature control, stuff the walls full of fiberglass batting insulation. Note that this batting material isn't dense, it won't block noise from bleeding through it, but it is a good thermal insulator depending on which wall you are treating. NetLag will hold the sound of the noise banging through the pipes inside and not let it spill out into the room.
Heavier cast iron water lines will hold more noise in than will PVC pipes if you have the option. Also if you can, opt for larger diameter supply and drain pipes to minimize the constriction of liquid flow and the noise that would come with it.
If you don't have access to your pipes, line the chase walls with dB-Bloc, add a layer of firring strips or resilient channels, and put up a new finished layer of drywall. This treatment is outlined in our Walls section, and will serve to combat any noise source from attempting to bleed through the wall. Here you are treating the wall, not the pipes, for stopping the bleed.
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