Dimension interior wall?

[mattiasohult]

Hello everyone!

I'm in the process of renovating a house built in '79 where the current interior walls consist of "studs" that are 28x45, a thin board glued to the studs, and no insulation in the wall. Since I plan to install new electrical wiring and also want insulation in the interior walls, my idea is to just tear down and redo all the interior walls. In this case, the exterior walls are load-bearing, so I don't need to consider the load-bearing function.

There are a couple of questions where I feel you hear different recommendations.

Stud dimension? 45x70 or 45x95?
Insulation? 45, 70, or 95? Stone wool or glass wool?
Panels? Single drywall, Chipboard + single drywall, OSB + single drywall, double drywall?

How would you do it?

 

[BirgitS]

Welcome to the forum!

If you don't plan to increase the distance between the studs, 45x70 should be sufficient.
The insulation thickness should match the stud thickness.
How easy do you want it to be to hang things up, and do you need to hang heavy things on the wall?

 

[mattiasohult]

Welcome to the forum!

If you don't plan on increasing the distance between the studs, then 45x70 should be sufficient.
The insulation thickness should be the same as the stud thickness.
How easy do you want it to be to put things up, and do you need to hang heavy items on the wall?

Thank you so much!

Regarding insulation, I've heard that you should leave some space for the electrical wiring, so if you have 45x70 studs, you insulate with 45. If you have 45x95 studs, you insulate with 70.

It feels like you might regret it in the future when you want to move things that are on the wall and only have gypsum, so I'm leaning towards chipboard + gypsum and maybe putting noggings where you know there will be a TV on the wall, etc.

 

[Viktor.J]

If one could wish.

45x90 with corresponding 90mm insulation. Insulation preferably wood fiber board. Then a layer of 15mm plywood and then 12mm gypsum.

But more common is probably to use 45x70, glass wool, OSB 11mm, and gypsum 12...

 

[BirgitS]

Feels like you might easily regret it in the future when you want to move things that are on the wall and only have plasterboard, so I’m probably considering particleboard + plasterboard and maybe adding noggins where you know there will be a TV on the wall, etc.

No noggins, use OSB if it might be relevant for a TV or heavy items.

 

[mattiasohult]

No noggings, use OSB if it might be relevant with a TV or heavy items.

Okay, thanks for the tip

 

[mattiasohult]

If I may wish.

45x90 with accompanying 90mm insulation. Insulation preferably wood fiber board. Then a layer of 15mm plywood and then 12mm gypsum.

But more common is probably to use 45x70, glass wool, 11mm OSB, and 12mm gypsum..

It feels hefty, but I understand that the result will be good!

 

[useless]

Regarding the insulation, I've heard that it's common to leave space for the electrical wiring, so if you have 45x70 studs, you insulate with 45. If you have 45x95 studs, you insulate with 70.

I've never heard that? However, it's common to create an installation space in the outer walls, but that's about getting the vapor barrier a bit inwards so you don't have to puncture it at every outlet.

 

[mattiasohult]

I've never heard of that? However, you usually create an installation space in the exterior walls, but that's about getting the vapor barrier a bit in so you don't have to puncture it at all the outlets.

Okay, maybe I've misunderstood this

Can you clarify how to create this installation space in the exterior walls?

 

[useless]

Can you clarify how to create this installation space in the outer walls?

Well, it's not particularly complicated. You put up a vapor barrier, extend the frame by 45 mm, and run all pipes and hoses there before putting up boards on the walls. The installation space is usually insulated as well, so the vapor barrier ends up a bit inside plus you can break thermal bridges with the double layers of framing/insulation.




https://villalivet.se/om-bygg/yttervagg/

 

[mattiasohult]

Well, it's not particularly complicated. You set up a vapor barrier, extend the framework by 45 mm, and run all pipes and hoses there before putting up the panels on the walls. Usually, you also insulate the installation space, so only the vapor barrier is placed slightly inward, plus you can break thermal bridges with the double layers of framing/insulation.


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Thanks for the clarification! Now even I understand

 

[Installation]

I've never heard of that? However, it's common to create an installation space in the exterior walls, but that's about getting the vapor barrier a bit inside so you don't have to puncture it at all outlets.

you don't need to fully insulate an interior wall since the insulation reaches its effectiveness at roughly 1/3 fill of the volume between the studs.

 

[useless]

you don't need to fully insulate an interior wall because the insulation reaches its effect at about 1/3 fill of the volume between the studs.

Yes, usually you insulate just for sound. Then it's not so important to fill the entire space.

 

[Viktor.J]

Yes, usually you isolate just for the sound's sake. Then it's not so important to fill the entire space.

And then you preferably want mass in the insulation, like wood fiber boards. But if it's soundproofing you're aiming for, there are several tricks up your sleeve, like double plasterboard, etc.

 

[useless]

Or stone wool... But I guess it depends on what requirements you have... Gypsum on both sides and glass wool should be enough in most cases in a normal home. If you have higher requirements than that, you need soundproof doors, ventilation, etc...