Soundproofing between rooms

[mojjen]

Working on an extension and planning to soundproof reasonably between adjacent bedrooms. Two of the rooms are adjacent to each other with a 95mm stud-bearing wall between them. Here, I thought of adding a 45mm wall with an air gap.

One of the rooms also borders a room where I haven’t put up a wall yet. Here, I thought of creating a double wall 2x70mm with an air gap, or alternatively 70 + 45mm. Does it make a big difference if I settle for 45mm on one side? I plan to use 70mm on one side regardless, as I will be embedding a floor heating cabinet in the wall and want a bit more to screw into.

The walls will be clad with OSB and a layer of drywall. The question is, should I also drywall the inner part? I can only access one wall for this. Or is an inner drywall unnecessary or even wrong? I’m thinking then Drywall-OSB-95mm-drywall??-Air-45mm-OSB-DRYWALL

 

[Tompafix]

Working on an extension and planning to soundproof reasonably between adjacent bedrooms.
Two of the rooms border each other with a 95mm framed load-bearing wall in between. Here, I plan to add a 45mm wall with an air gap.
One room also borders a room where I haven't put a wall yet. Here, I plan to make a double wall 2x70mm with an air gap, or alternatively 70 + 45 mm. Does it make a big difference if I settle for a 45mm on one part? I'm planning to use 70mm on one side anyway, as I'm going to inset a floor heating cabinet into the wall and I want a little more to screw into.

The walls will be clad with OSB and a layer of gypsum. The question is, should I gypsum-clad the inner part as well? You can only access one wall for this. Or is inner gypsum unnecessary or even wrong??
I'm thinking then Gypsum-OSB-95mm-gypsum??-Air-45mm-OSB-GYPSUM

Wow, that's serious. Do you have sound-rated doors then? My interior walls are 45x45 I actually took down the gypsum, insulated, and then put up osb+gypsum on the side I took down.

 

[mojjen]

Oh wow, that was serious. Do you have sound-rated doors then? My interior walls are 45x45 I've actually taken down the plasterboard, insulated, and then put up OSB+plasterboard on the side I tore down.

Not sound-rated but I buy solid or semi-solid. I have both in the house and both seem to dampen well. I always buy sound-dampening frames with rubber seals. My teenage daughter will probably soon start bringing home boyfriends, so it might be good for our peace of mind not to hear more than necessary

 

[Tompafix]

Haha. Yes, it's important to be foresighted We've placed our daughter at the far end of the house on the 2nd floor
Among others, Träguiden has information about what you're looking for https://www.traguiden.se/konstrukti...mkomplettering/ej-barande-vaggar/innervaggar/

 

[mojjen]

Haha. Yes, it's important to be foresighted We've placed the daughter at the far end of the house on floor 2
Among others, Träguiden has info about what you're looking for [link]

Now during the construction period, she has a room in the basement. We'll see if she agrees to move up later.....

 

[Tompafix]

Now during the construction period, she has been given a room in the basement. We'll see if she agrees to move upstairs later.....

Isover has more on this. You can choose the sound class you want to achieve

 

[mojjen]

Isover has more on this. You can choose the sound class you want to achieve

Isover's site was really good, thanks. It's clear that no drywall should be installed inside the wall...

Will try to determine how much is lost by reducing one stud to 45mm. After all, it's not a hotel we're building.

 

[nino]

Is a 70 rule really enough if you're going in with a cabinet?

 

[mojjen]

Is a 70 rule really sufficient if you're going in with a cabinet?

Double studded wall, so it's 2x70mm alternatively 70mm + 45mm, plus air gap 10mm and boards.

 

[Rabbithole]

70+45 becomes excellent if you have e.g. a 10mm air gap between. If you use OSB+ plasterboard on both sides and avoid holes, it will be a fairly quiet wall.

 

[Tompafix]

Double layers of plasterboard have better soundproofing than OSB+plasterboard

 

[mojjen]

Double layers of drywall have better soundproofing than OSB+drywall

Aware of that, however, no idea how much it does in practice. Prefer to have OSB boards behind...

 

[nino]

Double studded wall, so it's 2x70mm or 70mm + 45mm, plus air gap 10mm and boards.

The cabinets are 90 deep, right? So you'll get less insulation/damping through the cabinet but maybe that doesn't matter much.

 

[mojjen]

The cabinets are probably 90 deep? So you'll have less insulation/damping through the cabinet, but maybe it doesn't matter that much

It will likely have an impact. But you have to draw the line somewhere. It suggests trying to achieve 2x70 rather than 70 +45...