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Wall construction and ventilation flexible duct
Old 1 week ago
Gear Addict
Sarrova's Avatar
Wall construction and ventilation flexible duct


I'm building a home studio (semi-pro) and I'm trying to figure out a few things. I've read a lot (!) of information here and on other fora and in certain books but I still have a few questions. Hope someone can help me with these:

• 1. I wanted to know if anyone can advice me about the difference in soundproofing between these ideas:

First idea was to have
- MASS: 2 layers of gyproc, one layer OSB
- SPRING: 3 layers of 16cm RockWool Base (35 kg/m3) = 48cm
- MASS: concrete wall

But I had this second idea:
- SPRING: 1 layer of 16cm RockWool Base (35 kg/m3)
- MASS: 2 layers of gyproc, one layer OSB
- SPRING: 2 layers of 16cm RockWool Base (35 kg/m3) = 32 cm
- MASS: concrete wall

With the second idea, the first layer of RockWool would be inside the control room, functioning as a big acoustic absorber (hopefully to get some bass acoustics right). I would also gain 16 cm of space which would be very welcome - with the first idea, I would still need additional sound absorption panels at the back of the control room.

My question: would I loose a lot of soundproofing with the second idea or is this too difficult to assess? Because I need to be able to work without disturbing the neighbours.

• 2. I'm going to install a ventilation system. I'm planning to use a flexible duct of 9 meters which I will put on the top of the control room ceiling (with a few turns to stop the noise waves). On top of this, there will also be a layer of RockWool.

Something like this:

Is this enough to stop the sound of a band in the record room or do I still need to build a silencer box?

Thanks for the help!
Old 5 days ago
Gear Addict
Sarrova's Avatar
Nobody? I would really appreciate any advice I can get.
Thank you!
Old 5 days ago
Lives for gear
Jason Foi's Avatar

Using dense rockwool slabs inside the wall cavity is not needed. Use cheap fluffy insulation to dampen the resonance. The rigid slabs can actually reduce isolation. If you shrink the size of the airgap you will raise the resonant frequency of the assembly and reduce low frequency isolation. The construction you propose will be pretty good. The weak points will be hvac, electrical, doors, and most likely the ceiling, unless you can match the mass off the walls. You do need hvac baffle boxes.
Old 5 days ago
Gear Nut

How heavy/thick is that concrete wall?
If you have considerable a-symmetry in your masses the isolation behavior differs from the situation with more symmetrical masses.
Old 4 days ago
Gear Addict
Sarrova's Avatar
Thank you both for the advice!
Bert, I will contact you via PM for a few more questions if thats possible.
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