Nice guy needs a validation and hesitates on the wall

Hello everyone ! First of all I would like to thank you for taking the time to read my message. I post message for two reasons. The first is to know your opinion on the plans of my studio, and the second is a hesitation between two ways to do the walls. THE STUDIO PLAN: Here is the studio plan what do you think there are things to improve? THE WALLS : Version A / Simply make a frame the size of the wall and slide wood cleats and fill with rock wool (20cm) Version B / make the frame of the width of rockwool and secure them together (much more convenient if I move) To make the floor I will do the same thing as sketch A for the wall. The ceiling height of the room is 270cm, I will make a ceiling of 230cm Budget 2000 € = 2200 $ Summary/ What do you think of the plan? What type of wall to do between the A and B (see sketch) What do you think of the height? What do you think of the floor? I thank you in advance for your help and for the time you give me!

Welcome to the forum! I don't really understand your post. We are used to seeing SketchUp pictures here. So are you building a room in a room or just applying acoustic treatment around an already built room? Do you want the room to sound great for mixing or recording voices? Greg

Gregwor wrote:

Welcome to the forum! I don't really understand your post. We are used to seeing SketchUp pictures here. So are you building a room in a room or just applying acoustic treatment around an already built room? Do you want the room to sound great for mixing or recording voices? Greg

Thank you very much Greg for your response so fast !! I beg you to apologize if I was not understandable I want build a room in a room I wish to use it to mix but also to record voices I live in an apartment in Paris that's why isolation is very important for me Sketchup I installed sketchup to redo the sketch -In white are the existing wall that I can not touch I plan to build: -in brown are the boards osb -in yellow is rockwool (osb=rockwool=20cm) -on the top of the room the desk -at the bottom the microphone for the floor and ceiling I intend to do this What do you think? I confess I'm also a little lost on the choice of rock wool, I am very knowledgeable but it is difficult to make the final choice, can you? Size of the piece currently (so without osb without rockwool that does not exist yet) ><260*310 ^270 Forgive my bad english i'm french > I do not want to make the mistake of most people, I do not want to build before I consult you :wink: Thanks you very much

I understand now!

I live in an apartment

Do you have any plans for HVAC? Do you own the apartment? So you can do whatever to the suite?

I plan to build: -in brown are the boards osb -in yellow is rockwool (osb=rockwool=20cm)

It looks like you have designed the inner leaf to have OSB on both sides of the studs. You cannot do this. This will create a three leaf system. You either have to build the walls traditionally or inside out. Your room is very small so it might be worth building the entire thing inside out. No matter what, you should be building your inner leaf ceiling inside out!

for the floor and ceiling I intend to do this

There are many threads on the forum showing how to build an inside out ceiling. For the floor, what you've design there won't help. It will actually make things worse. What your design has is a bunch of small cavities that ultimately will resonate and at their resonant frequency, they will actually amplify! Since your floor design has floor joists which are allowing a direct connection between your floor sheathing and the buildings structure, this too will not perform as you want it to. If you look at floating floor designs, the most simple design is to use rigid fiberglass insulation to help decouple your inner leaf floor from the building structure. So ditch the floor joists and lay thick/heavy sheathing on top of it. Leave a gap around the perimeter and caulk the gap. You need several layers of sheathing. Greg

Gregwor wrote:

I understand now!

I live in an apartment

Do you have any plans for HVAC? Do you own the apartment? So you can do whatever to the suite?

I plan to build: -in brown are the boards osb -in yellow is rockwool (osb=rockwool=20cm)

It looks like you have designed the inner leaf to have OSB on both sides of the studs. You cannot do this. This will create a three leaf system. You either have to build the walls traditionally or inside out. Your room is very small so it might be worth building the entire thing inside out. No matter what, you should be building your inner leaf ceiling inside out!

for the floor and ceiling I intend to do this

There are many threads on the forum showing how to build an inside out ceiling. For the floor, what you've design there won't help. It will actually make things worse. What your design has is a bunch of small cavities that ultimately will resonate and at their resonant frequency, they will actually amplify! Since your floor design has floor joists which are allowing a direct connection between your floor sheathing and the buildings structure, this too will not perform as you want it to. If you look at floating floor designs, the most simple design is to use rigid fiberglass insulation to help decouple your inner leaf floor from the building structure. So ditch the floor joists and lay thick/heavy sheathing on top of it. Leave a gap around the perimeter and caulk the gap. You need several layers of sheathing. Greg

Hello I'm not sure I understand everything so I'll repeat and you would tell me if it's okay :) For the walls: -I do not understand what you mean by saying "walls traditionally or inside out". I do not have to do, an OSB / a wool / OSB / studio; but rather, a wool / OSB / studio? (Some pictures would help me a lot to understand) Someone advised me to use this wool on one layer (4cm = 1.57 inch) seller: https://www.leroymerlin.fr/v3/p/produit ... 1-2-e61493 maker: https://www.rockwool.fr/produits/cloiso ... icats%20... Is better to choose another (cheaper and thicker?) if yes which? For the floor: Put plain wool "just" on the floor by not putting wood on the floor. (Like sketch A) with OSB on top? I have to put my wall around the floor or on the floor? It's hard for me to understand this passage (So ditch the floor joists and lay thick/heavy sheathing on top of it. Leave a gap around the perimeter and caulk the gap. You need several layers of sheathing.) (here too a sketch would help me a lot to understand) Your questions: It's not my apartment so I can not do anything inside. I am nothing for vmc Thank you 1000 times for the time you give me