mineral wool floating floor construction and MSM calculation

[Nikodemos]

Rod, if i understood your question:
I am planning to make them all concrete floating floors......i just though that i could probably use minerall wool as the concrete underlayment-spring in those rooms where is not going to be huge amounts of noise and go for a more profesional-calculated aproach for the more critical rooms using elastic pads under concrete.....so if you ask if i am going to use concrete as the floating floors ....yes i do.
My main problem is that it is a big space (at least for my budget) 120m2 and i must fit it all in
So if the "pads - concrete" sollution is within my budget limits i wiil go for it all the way...otherwise i will probably use the "mineral wool - concrete" apraoach on some rooms....i guess in that case my main concern is going to be the height of the floor to be the same in all the rooms to allow me to run wire - pipes through it.

Do you think that something like this could be problematic?

thanks
Nikodemos

[Nikodemos]

just some thoughts i would like to share with you....
I decided that floating a concrete floor is a really complicated work and it's no place for expensive experiments....on the other hand constructing a properly calculated 12cm concrete floor on elastomer pads for the whole 110-120m2 of my studio is out of my league(regarding cost)
So i decided to make 12cm concrete floating floors based on properly placed and deflection calculated elastic pads which will allow a real room in a room aproach (inner walls on floating floors) in the practice room, drum booth and iso booth. These will be the rooms with the highest sound level.
On the other hand in the live room i'm planning to record mainly acoustic instruments.
So i was thinking to use an aproach by P.Newell for these rooms:
a lightweight floating floor(multiple layers of plywood and drywall sandwiched) based on rebonded foam. Eric Desart also mentioned rebonded foam(well for heavy concrete floors ) and i was wondering if i could build a medioum weight floating floor on this kind of foam. I know that the MSM frequency is going to be high.....can things get better by using a thicker rebonded foam underlayment (8-10cm) and create a heavier (as posiible) floor?
A last question:
I read Rod's book regarding elevated and sand filled wooden decks.....could a combination be possible?
I mean an elevated (mechanicaly decoupled) sand filled deck

I'll post a drawning of what i mean

thanks

Nikodemos

[Nikodemos]

Hi everybody
i begun constructing a concrete floating floor using elastic pads from Vibro(a Greek antivabration product). The pads are 12,5x12,5x2,5cm and i'm using 2 layers(a total of 5cm height). According to the specs the floor will have a natural freq of 9 Hz under a load of 120kg per pad(double layer), so i'm going to pour 12cm of reinforced concrete (280-290kg/m2) using 2,5 pads/m2 with 5cm of 70kg/m3 rockwool in between. On the perimeter i'm putting pads every 60cm (according to the manufacturer) in order to support the extra load (120-170kg/m) of the walls.
Then comes 2cm of plywood as a permanent base for the concrete pour.
The floating floor is decoupled from the concrete walls by 5cm of 100kg/m3 rockwool.
I'm following this approach for the Practice room, the Iso booth and the drum booth. For the Control room and the live room i'm going to build a floating floor on rockwool the way mr.Gervais suggested (walls floated separately).
On the pics you can see the progress in the drum booth and the "finished" (no concrete yet) underlayment for the practice room and the Iso booth.
please let me know what you think.
Nikodemos