How to soundproof interior wall ?

[zankan]

Hello
Does anyone know the best way to soundproof a wall between the living room and bedroom?

Adding more drywall is the only way... If you have a door between the rooms and have the possibility to remove it, do so.

 

[Gizmo]

Insulate with 70mm in the wall
Double boards on both sides of the wall
Seal the gaps with joint compound (flanking transmission) along the boards before nailing the trim

or check this: http://www.byggahus.se/cgi-bin/yabb/YaBB.pl?board=Isolering;action=print;num=1085406914

 

[OddJ]

...and make sure that the ceiling and the floor are not connected between the rooms. If they are, it is advisable to cut a gap before building the wall.