Making adjoining walls more sound proof

[DeadBeat]

I'm just moving into my new home, its a 1960's semi. the neighbours have young children which is not at all a problem for us however it has highlighted just how much sound travels through the wall between the two houses. I'm worried that not only will we be able to hear them, they will be able to hear us. Luckily they seem like a really nice conscientious couple who have already told me to let them know if there is too much noise. however it seems better for us all if i can improve the sound resistance of the walls myself.

the house itself is about it be stripped apart room by room and refitted and probably plastered, so my initial thought is that i can build a false wall in front of the current walls and line them with sound absorbing materials. im quite happy to line the walls between the chimney breasts with a good 10 - 15 cm deep stud wall as long as the sound deadening material isnt to expensive to fill it.

Any suggestions as to what I could use?

also the floors both upstairs and downstairs are wooden, im wondering if i should also fill between the joists just at the joining side with something as well.

thanks

 

[foxhole]

http://www.knauf.co.uk/product-range-overview/plasterboard/knauf-silentboard

 

[Ricardus]

Ideally you need to put in a false wall, fully detached from the existing party wall, but 10-15cm might be a bit on the narrow side to do it.
Have a google around there are plenty of pages (and some interesting Youtube vids) on soundproofing - but basically you can put in a double skinned layer of heavy plasterboard (acoustic plasterboard like soundstop or similar) and decouple if from the existing wall by using resonance bars or attaching it to the floor & ceiling not the existing wall you should see a decent drop in transmitted sound.

 

[DeadBeat]

to be honest its not a problem to go deeper, could probably spare the depth of the chimney in truth, id rather get a proper sound barrier than a half effort although as always the budget is limited

 

[foxhole]

I had good results with rockwool, I stacked it 300mm deep to block a disused doorway to a conference room and provided almost total soundproofing, so 150mm behind plasterboard should work well.