Good soundproofing between two bedrooms

[Walle85]

Hello,

I plan to renovate two bedrooms and put up a new wall between these rooms, about 4 meters. I initially thought of using 95 frame beams, bottom seal, and rock wool for insulation/soundproofing. But then I wondered if it might be better to use two layers of 45 frame beams staggered, to have fewer places where there are beams running all the way through the wall.

Does anyone have feedback on this idea or tips on how to achieve the best possible soundproofing, without taking up more than about 100 mm for the frames themselves?

 

[Installation]

Hi,

I'm renovating two bedrooms and planning to put up a new wall between these rooms, about 4 meters. I was initially thinking of using 95mm studs, base insulation, and rock wool for insulation/soundproofing. But then I considered if it might be better to use two layers of 45mm studs staggered, to have fewer places where the studs go all the way through the wall.

Does anyone have feedback on this idea or tips on how to get the best soundproofing possible without taking more than about 100mm for the studs themselves?

Yes, you reduce the flanking transmission somewhat. Even better if you use double 45mm frames with 10mm between them.
Regardless of the solution, don't place electrical boxes in the same cavity.
Double layers of boards per side are a must, but you're probably aware of that. The type of insulation you choose is fairly irrelevant as it should handle internal resonances. The most important factors are the distance between the board layers and their weight. This determines the wall's natural frequency, and you want that to be as low as possible. A wall "loses" several decibels at its natural frequency and its harmonic overtones.
That is, if the natural frequency is 100, it loses at 2, 4, 800, etc. But that's more advanced.

 

[Walle85]

yes, you reduce flanking transmission somewhat. Even better if you use double 45mm frames with 10mm between them.
Regardless of the solution, do not have electrical boxes in the same compartment.
Double sheet layers on each side are a must, but you're probably aware of that. The insulation you choose is fairly indifferent as it should handle internal resonances. The most important thing is the distance between the sheet layers and the weight of these sheet layers. This determines the wall's natural frequency, and you want it as low as possible. A wall "loses" a number of decibels at the natural frequency and its harmonic overtones.
That is, if the natural frequency is 100, it loses at 2, 4, 800, etc. But that's advanced.

Thanks for the answer.
A thought regarding double 45 frames with 10mm between them, I assume you mean leaving a small air gap in the middle of the wall? Or should this space also be filled with insulation?

 

[MagHam]

There is also special insulation that is more soundproof than regular glass wool (which is optimized for heat/cold)

 

[Installation]

Thank you for the answer.
A thought about double 45 frames with 10mm between them, I assume you mean leaving a small air gap in the middle of the wall? Or should this space also be filled with insulation?

Just an air gap. It's only meant to break the frame. Similar to a broken thermal bridge.

 

[Walle85]

There is also special insulation that is more soundproof than regular glass wool (which is optimized for heat/cold)

I have been advised to use Rockwool Flexibatts.