Rockwool Panels + Airgap

[Jonjonjon]

Hey guys!

My Rockwool acoustic panels are almost complete! I've got a quick (maybe silly) question:

1. The wooden frames of my boards are 100mm deep. The rockwool is 75mm thick. How I've ended up making the boards is having the rockwool pushed up (not squashed though) against the fabric on the back of the boards. So, if you had to look at the board from the front, there is fabric, then an airgap of 25mm, then the rockwool, then the fabric on the back. Should it be the other way around? Should the rockwool be sitting flush against the front of the boards fabric?

??

[Starlight]

Have the rockwool on the face that is furtherest away from the wall. It is acoustically better to have a gap behind the rockwool. If you can, with 75mm rockwool, have a 75mm gap. 25mm is better than nothing.

[Sen]

+1...also, brackets can be used to mount the whole trap further from the wall to get more airspace behind the rockwool slab (if the space permits of course)

[Salpion]

Hello everyone!


I am in the process of building a recording studio above my home residence, which is also under construction. I think I have made a big mistake and I need a kind of undo-advice from you. The thing is I invested more into sound insulation on the external walls of both control and live room (to avoid complaints from my really crabbed neighbour! ) instead of the internal wall between the two rooms.


External walls: regular brick (4 inches / 10 cm) + 2 layers of polysterine (4 inches / 10 cm) + regular brick (4 inches / 10 cm) + rockwool (2 inches / 5 cm) + 1 layer of half-inch plasterboard.


Internal wall: regular brick (10 inches / 25 cm) and that's it!!!


Since the internal wall is probably quite poor for insulation, I am thinking of adding to the existent 10-inch brick wall a 4-inch brick wall (with 4-inch air space in between) + 1 or 2-inch rockwool + 1 layer of half-inch plasterboard. That's a total of 19.5 or 20.5 inches (49.5 or 52 cm).


My questions are:


1. Taking for granded that 52 cm is the maximum sum of thickness I can get (or even less if possible) for my internal wall, is there a better combination of the materials above or different calculations of their thickness?


2. What is the ideal thickness of air space between the two brick walls in my case?


3. Is there any sound insulating material to use (instead of having an air space) that would have given me a better result? What about polysterine?


4. What kind of rockwool should I look for to get effective sound insulating and absorbing conditions? Any helpful links online? How much thickness should I go for?


5. Is there any other material I could use to replace rockwool for more effective sound insulation or acoustic absorption?


Thanks a lot for taking the time to read about my concerns!

[Salpion]

I have been told that it would have been better if I started a new thread? But how do I do that? I am obviously new in this!