Best Sound insulation for internal stud walls?

[ashthekid]

Any recommendations for decent sound insulation between stud wall partitions?

Or are they all about the same?

 

Any tips most gratefully appreciated. Already planning to use soundbloc 15mm plasterboard everywhere.

Would anyone recommend sticking 20mm PIR on one side of the stud walls as well or is that overkill?

[nod]

Most of the jobs I price spec ISO Acoustic insulation 25 -100 mil 

If you want to spend a bit more The knauf Acoustic batts are good

[Moonshine]

54 minutes ago, ashthekid said:

Would anyone recommend sticking 20mm PIR on one side of the stud walls as well or is that overkill?

 

No, PIR has very limited acoustic properties 

[Faz]

And costs a fortune!

[nod]

You could add res bar either side prior to boarding 

MF studding is far better than timber for sound insulation 

[Dan F]

Look at British Gypsum whitebook, it will give you all options with dB values. Both for MF, staggered timber stud and stud wall with/without resilient bars and with different types of plasterboard.

[ashthekid]

@nod Unfortunately all timber stud work is up already so can’t have MF studding.

Have considered res bars but will likely have battened layer.

 

In some key areas I may decide to put some of the foam backed plasterboard which sounds like it’s quite effective.

And then just fill the cavity space between the stud walls and floor joist between ground and first floor.

[Dan F]

18 minutes ago, ashthekid said:

@nod Unfortunately all timber stud work is up already so can’t have MF studding.

Have considered res bars but will likely have battened layer.

 

In some key areas I may decide to put some of the foam backed plasterboard which sounds like it’s quite effective.

And then just fill the cavity space between the stud walls and floor joist between ground and first floor.

 

Res bars is one of the best things you can do for sound, so I'd reconsider this is you care about sound rather than foam-backed plasterboard.  Where have you read about form-backed plasterboard for acoustics out of interest?

 

About the best you can do with standard wooden studwork, which gives you 59dB Rw, is:

- 50mm acoustic roll withinn studwork

- Resilient bars (just putting them on one side is almost as effective though at 56dB)

- 2 layers of 12.5mm soundbloc on both sides.

 

Resilent bars are cheap, and you can use standard PB.  15mm Soundbloc on either side for comparison gives you 40dB.  15mm Soundbloc + acoustic roll gives you 43dB.

 

 

Edited May 11, 2021 by Dan F

[nod]

6 hours ago, ashthekid said:

@nod Unfortunately all timber stud work is up already so can’t have MF studding.

Have considered res bars but will likely have battened layer.

 

In some key areas I may decide to put some of the foam backed plasterboard which sounds like it’s quite effective.

And then just fill the cavity space between the stud walls and floor joist between ground and first floor.

Two layers of sound block board would be far more effective and cheaper than foam backed Or a layer of horizontal G yprock plank Then SB We devise Party walls this way On TF builds 

Edited May 12, 2021 by nod

[tonyshouse]

Two different thicknesses of sound block work well if double plaster boarding, rockwool found batts 

 

OCD on air gaps through, round, over and under even via the floor or loft, and no back to back electrics 

 

I prefer concrete blocks 

[ashthekid]

@Dan F I’ve seen a few options(screenshots below) on a specialist soundproofing website but after everyone’s comments I’m beginning to think it’s not worth it. 

I have issues with head heights too in this project so can’t go crazy thick on floor or ceiling joists. 
I’ve seen this 5mm rubber matting(below) that is good for effective soundproofing a little bit. Worth the investment?