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I wasn't planning on stripping all the plaster board but use this stuff ... http://www.noisestopsystems.co.uk/wall-soundproofing/noisestop-acoustic-panel?zenid=0078c78c9ee86a249d55aca7374f2ff3
over the existing plaster board. I've got a stud finder but it gets confused. I'll cut an inspection hole though by using the stud finder and prayers but I'd rather have some original building details first.
Yeah, stripped the plasterboard so you can insert the damping. Presumably the neighbours also have their own wall of plasterboard or simliar? So you could use a stud finder to avoid electrics/studs/etc and then cut inspection hole.