OSB & gypsum overlapping for best soundproofing?

[pelig]

Planning to set up an internal wall between a teenage room and a workspace and want to achieve maximum soundproofing but with the thinnest wall possible. Contradictory, sure, but space is limited and every cm counts... :|

The plan is [drywall] + [OSB] + [studs/insulation] + [OSB] + [drywall].
studs/insulation will be 45 mm due to space constraints.

My question is, to maximize soundproofing, I was thinking of staggering the drywall and OSB so that the seams do not align. Is that a worthwhile idea?

And if so, does it matter where the studs are when attaching the drywall? You can screw anywhere on an OSB board, right?

 

[Stefan N]

Having the joints overlapped for soundproofing doesn't matter, but they should be overlapped for the best durability anyway.

 

[snuttjulle]

You should be able to achieve really good soundproofing by adding just 1 cm and then staggering your studs so you're not screwing OSB from two directions into the same stud.

 

[Lillmalen]

Certainly, that’s the case, it will be 2 walls with just 1cm extra thickness. Have built the ceiling/floor like that, works excellently against impact sound.

 

[arkTecko]

I believe that double drywall gives you better insulation than OSB + drywall. Also, put rubber strips between floor studs, ceiling studs, and drywall studs. Alternatively, buy metal studs for sound insulation, they have integrated strips and are supposed to be better than wooden studs from a sound perspective.

 

[cpalm]

I would like to recommend the Gyproc handbook as well. There is a lot of useful information there, including about acoustics. http://ehandbok.gyproc.se/Gyproc/GyprocHandbok/

 

[FG]

The OSB boards degrade sound insulation, use only fibergips.

 

[SBH]

The OSB boards reduce sound insulation, use only fiberboard gypsum.

well not significantly. or yes. I don't know about OSB though. I've only looked into plywood and gypsum or plywood doesn't make much difference in a 45mm based iso/reg wall

 

[pelig]

Thanks for all the smart tips! The idea of pulling apart by 1 cm sounds clever. The question is, what's the easiest way to build on the outer studs so they become 55 mm? I checked byggmax.se to see if there is 10 mm batten, sort of, to build on. But I can't find anything? And a 55 mm board hardly exists...?

 

[Peter2400]

Thanks for all the smart tips! That idea of pulling apart 1 cm sounds clever. The question is how to easiest build on the outer joists to make them 55 mm? I checked byggmax.se to see if there is a 10 mm batten, like, to splice on. But I can't find anything?
And a 55 mm board hardly exists...?

If you don't have anything to split the joists with, it becomes more difficult, you might combine 2 pieces of 28x70 to get a 56x70, that should suffice.

 

[FG]

Since the thread is about maximizing soundproofing, I see no point in using OSB/plywood. It results in a degradation of around 3 dB because the stiffness of the surface layers increases, which reduces the coincidence. It’s better to choose heavy materials like Fermacell fiber gypsum boards, which can hold heavy items. Additionally, it’s important to seal properly. If you want to improve further, you can mount the boards asymmetrically or use more gypsum layers with damping glue.

 

[7ender]

As mentioned, skip OSBn.
When I built my music room, I used double layers of gypsum board staggered, and sealed both layers with latex sealant all around and also in the joints.
Works well.
With damping glue it should be even better, but maybe overkill for you.

 

[pelig]

Hmm, more good input, thanks! Fermacell seems good, but probably expensive since I can't find either retailers or prices on the website...

If you don't have anything to split the studs with, it will obviously be more difficult, maybe you can join 2 pcs of 28x70 so you get a 56x70 that should suffice.

Yes, that would be the right width but it feels thick to then screw through 70 mm timber when fastening? But maybe it doesn't matter, thanks anyway for the tip!

As I said, skip the OSB. When I built a music room, I used double layers of gypsum staggered, and sealed both layers with latex caulk around the edges and also in the seams. Works well.

Sounds reasonable, what kind of studs did you have? Did you stagger them so that the sound couldn't travel through the studs?

The reason I want OSB boards is for it to be easy if you want to hang something. I'm a bit against drilling/plugs in gypsum, it leaves such big ugly holes when you move things. But if double gyprock is superior to gypsum+osb/plywood then maybe it's the most sensible after all.

 

[7ender]

Yes, the idea is to make it as difficult as possible for sound to seep through. But with double drywall, I assume you always stagger the panels.
I used existing studs; cross-laid 90x45 wooden studs, meaning only 45 mm insulation.

But the basic idea in soundproofing is to have as much mass as possible. So if you find a chipboard that weighs as much or more than drywall, it should work (in that case, osb).
Plus, it needs to be completely airtight. Therefore, don't skimp on sealant, like latex caulk, which is relatively cheap.

 

[FG]

http://www.norgips.se/ultraboard