Fixings for studwork and heavy plasterboard wall

[Manty]

I'm looking at fixing 50x50mm vertical battens at 400mm centres onto a party wall (for noise reduction), but I'm not sure which fixings I should use or the spacings between the fixings.

It's a 1930's semi, single brick party wall with sand/cement render and plaster (which is old), and given that I'll be hanging 2 layers of 15mm plasterboard I'll need to fix directly into the brickwork.

Should I use something like hammer fixings or frame fixings like the kind of fitting windows and doors?

Alternatively, if I built a seperate stud wall using 3x2 is it still possible to get a sturdy result if I fixed it to the adjacent walls, floorboard and ceiling with bracings/noggins or do I just need 1 run of noggins across the middle?

I know a totally seperate wall is the better option, just trying to minimise the space loss

 

[joinerjohn]

Have you thought about trying dot and dabbing some insulated plasterboard to the party wall? At least that way space loss would be at a minimum.

 

[Deluks]

Alternatively, if I built a seperate stud wall using 3x2 is it still possible to get a sturdy result if I fixed it to the adjacent walls, floorboard and ceiling with bracings/noggins or do I just need 1 run of noggins across the middle?

That one.
Technically you could do it in (proper) 2x2 (actual 50mm square timber. Fix it top and bottom only using floor and ceiling plate, 2 set of noggins, double 12mm PB should be rigid enough to keep it from going anywhere.
Set it an inch from the wall, completely fill the void with 75mm rockwool slabs. Acoustic caulk the perimeter.
a compromise sure, but you'd only lose 4" room space.

JJ's idea is sound, but not so soundproof. The foam insulation tends to reverberate instead of absorb.

 

[ajrobb]

Are you planning on removing the existing plaster?

I've read that GypLyner channel can be cemented to masonry (18mm deep). Attach horizontal resilient bar (16mm deep). Line cavity with 25mm acoustic mineral wool. Attach 2 layers of 12.5mm SoundBloc plasterboard staggered 600mm to support joins. Seal edges with acoustic sealant.

I'd be worried that attaching plasterboard to studs fixed to party wall isn't going to reduce noise much.

 

[Blagard]

Hi,

I found this document from the BRE (Building Research Establishment) when answering another thread. It may help you.

http://www.bre.co.uk/filelibrary/pdf/cap/soundins_homes.pdf

 

[Manty]

Thanks very much for the help guys, lots to take in here.

 

[ajrobb]

is it still possible to get a sturdy result

I should point out that the best performing plasterboard acoustic barriers rely on being flexible. So if you equate 'sturdy' with 'rock solid' there could be a problem.

I suggest you look at the British Gypsum White Book for application ideas.