Sound proofing portion walls.

[Russell griffiths]

Stud wall between a bedroom and an en-suite bathroom. 
90mm timber studs. 
insulate inbetween studs or double plasterboard both sides. 
 

this is a holiday lodge we have so the only noise will be hearing the wife dropping the kids off at school. 
 

I think bang for my buck double boarding is cheaper. 

[JohnMo]

90mm studs 50mm dense mineral wool I used rock wool Flexi - zero issues and normal 12.5mm plasterboard on each side.

[Russell griffiths]

17 minutes ago, JohnMo said:

90mm studs 50mm dense mineral wool I used rock wool Flexi - zero issues and normal 12.5mm plasterboard on each side.

This is exactly what I have done in the house. 
im just thinking plasterboard is cheap if I buy a pack, and double boarding is easy if I’m already doing it and the screw gun is out. 

[JohnMo]

11 minutes ago, Russell griffiths said:

This is exactly what I have done in the house. 
im just thinking plasterboard is cheap if I buy a pack, and double boarding is easy if I’m already doing it and the screw gun is out. 

With the empty void even with 2x plasterboard each side, its still a drum. Air is a great way to carry noise.

[saveasteading]

Impact noise or airborne?

For both, if you can spare a bit more wall width  (how much do you have?)

 

Studs twice, staggered to face each room  with plasterboard only on one set of studs, so that you have physical discontinity.

That deals with bumps and some loud noise, especially bass.

 

eg a 100mm sole plate but 75mm studs lining up alternately with only one room or the other.. @ 600mm cc, twice, so actually every 300mm

 

Then fill the void with any mineral wool, and you can even put some between studs and the 'other' side. It will snake.

One sheet pb each side, possibly upgrade to the denser blue faced grade.

 

for dB figures see the Knauff catalogue.

 

That will be stunningly good, with the weaknesses being at plates to floor, ceiling and existing walls, so you'll still hear the vacuum bumping at skirtings.

 

 

[Russell griffiths]

3 hours ago, saveasteading said:

Impact noise or airborne?

For both, if you can spare a bit more wall width  (how much do you have?)

 

Studs twice, staggered to face each room  with plasterboard only on one set of studs, so that you have physical discontinity.

That deals with bumps and some loud noise, especially bass.

 

eg a 100mm sole plate but 75mm studs lining up alternately with only one room or the other.. @ 600mm cc, twice, so actually every 300mm

 

Then fill the void with any mineral wool, and you can even put some between studs and the 'other' side. It will snake.

One sheet pb each side, possibly upgrade to the denser blue faced grade.

 

for dB figures see the Knauff catalogue.

 

That will be stunningly good, with the weaknesses being at plates to floor, ceiling and existing walls, so you'll still hear the vacuum bumping at skirtings.

 

 

No room for that the whole building is only 6mx6m and it’s only a holiday let so only slept in for 4-5 consecutive nights. 
just looking at a cheap n cheerful solution. 
probably easier to just buy a couple of packs of acoustic insulation and chuck it in. 
trying to save a fiver here and there.