new ceiling for live area

I am in the process of reconstructing the ceiling of my main live area. The idea behind this project is as seen in the attached diagram. I will be leaving 8inches(200mm) air gap between the concrete and the Rockwool and another 4 inches (100mm) between the gypsum board and gypsum soffit. The walls and flouting floor are ready in place. As any other studio, I need to have as much sound isolation as possible mainly because the studio is in a semi basement block with 3 apartments above. Any further suggestions or ideas that might improve the job?

welcome! please update your profile with your location. the air gaps look like a nice size but you are likely better off bundling the mass layers together especially the ceiling you show as you want to avoid a triple leaf effect which can reduce your isolation in the LF range. maybe two layers of drywall inside instead of one. increasing the mass on the floor would also be a very good idea to avoid creating a large drum which is the opposite of what you're trying to achieve.

thanks glenn.. I need a space of at least 100mm as to angle (place) each gypsum slab in the iron frame place. Regarding the floor, it is already finished. I am attaching a finished pic of the room where it shows the gypsum ceiling slabs which will be put back in place after the treatment. If there are any more options how to go around this let me know. thanks...

Hi Rene. Welcome!. It's a pity you came here after the floor is already finished, since what you have there is not a good idea. That entire floor is a resonant cavity that will amplify certain frequencies and transmit them back into the room, or into the rest of the building. Like Glenn said, you need a lot more mass on that floor to fix it, or a much larger air gap, or both. Regarding the ceiling: As Glen also said, your plan right now will create a three-leaf system, which means that it will most likely give you WORSE isolation in the low frequencies than you have right now. So your drums and bass guitars will be heard even MORE clearly in the rest of the building if you do that. The same applies to your walls. You should NEVER have three leaves in a wall if you want it to isolate well. You want two leaves, and only two leaves. To fix your wall design: Move the rockwool into the cavity between the existing wall and the new inner wall, and also replace the two layers that you have there "12mm chipboard and 12mm drywall) with two layers of 16mm drywall. 12mm is too thin for good isolation: it is too flexible, the resonant frequency is too high, and it does not have enough mass. So after you fix that, you would have an air gap next to the existing wall with plenty of rockwool in it, then two layers of 16mm drywall next to each other. That will give you good isolation, but not with the way you show it right now. And the ceiling should be done the exact same way. If you do the walls and ceiling different from each other, your overall isolation will only be as good as the weakest one. - Stuart -