Insulation around SVP

[Alex C]

The NHBC guidelines are for minimum 25mm sound insulating material and 25mm plasterboard. I would be using this as a minimum in my own house. You could use 2 sheets sound block plasterboard. You need to make sure that the svp does not touch any timber as this will transfer sound as well. a 127 stud is no way big enough, you could batten over it to give some extra thickness.

[Mr Blobby]

Just to resurrect this old thread, do acoustic soil pipes like Marley Blue actually work? 

And by work, I mean can I get away with a smaller box around the pipe with similar noise suppresion as a big box and rockwool?

 

Or maybe just put the pipe outside, it is on a hidden part of the house.