both side drywall sheet for second isolation wall...

[hugo_inside]

Hi, my studio room is made by 200 mm thick concrete block filled with sand, and the ceiling is made of light vault and metal mesh over it with concrete. My question is,

1.- for the inside isolation I'm thinking of drywall this steel framing, but I need both sides with sheet rock? 2 plies of sheet rock both sides? only one or 2 on one side and 1 in the other side?

2.- Is 40 mm 70kg/m3 so enought isolation for inner walls?

3.- I want to float my control and recording rooms independient. Must the dividing wall be builded at the same time that the isolation walls??

This is a draw about it: grey zone is concrete block walls, and dark green zone is the drywall walls.

[rod gervais]

Hi, my studio room is made by 200 mm thick concrete block filled with sand, and the ceiling is made of light vault and metal mesh over it with concrete. My question is,

1.- for the inside isolation I'm thinking of drywall this steel framing, but I need both sides with sheet rock? 2 plies of sheet rock both sides? only one or 2 on one side and 1 in the other side?

Nope, you only want drywall on the inside surface of the framing, never on the side where the block is.

2.- Is 40 mm 70kg/m3 so enought isolation for inner walls?

Sure nuff

3.- I want to float my control and recording rooms independient. Must the dividing wall be builded at the same time that the isolation walls??

If you are constructing isolated foating floors - then it is very important that the dividing wallS (Note that there will be 2 of them - not one) will have to be built after the seperate floors are built.

Each floor will have to be built to the outside of the room's new wall locations - so all of the room's walls sit ontop of the floor.

Different subject now - what exactly is your floating floor design?

Because you can get yourself into some serious noise problems if that is not done right.

SO explain................

Rod

[hugo_inside]

Hi, Rod! Sorry for the delay...

This draw is what I want to do aprox. Materials will be:

- 20 mm EPDM rubber shore 50 (how much space do I need between the pucks?)
- Russian pine joists (50 x 100 mm)
- 2440 x 1220 x 15 mm fiberboard tables (2 plies)
- 40 mm Rockwool 70kg/m3 between joists

Weight is around 500 kg max in the CR and around 250kg in the recording room.

[the dreamer]

Hi Hugo,
I also planned to do my floating floor with EPDM rubber. I switched to Sylomer now.
But what I learned is that when using EPDM you aim for 10-15% deflection under load. So ask your supplier what load it needs to compress one puck in the needed size for 10-15% and transfer that to load per m². Then you can easily conclude the spacing.
What kind of wheight are you refering too? is this the weight of the whole structure incl. floor, walls, ceiling, people, equippment,etc?
If so I think this is really lightweight.

Recently Eric D came up with something interesting: If you have a really heavy floating concretefloor with walls an ceiling floating on it, it doesn't matter that much when the liveload (people / equippment etc.) varies. For example if the floating structure weighs 6000kg it doesn't change the "decoupling behaviour " so much with 300kg more on it. If the structure weighs 500kg and you have 3 heavy mates in there, this will ruin your decoupling "Hertzwise"!!!

Quote Eric D:
"If you make a lightweight floor, then added load of people is relative important.
Your decouplers must be able to withstand those maximum loads.
As such the static load can vary a lot, which alters the resonance frequency: under high load = lower, without additional load is higher." End quote.

Happy planing.
Florian

[hugo_inside]

Hi the dreamer, this is the aprox weight of equipment and 4 mates in the CR and equipment and a musician in the recording room.
Does I need to include the walls ande ceiling weight?

I try to find Sylomer dealers in spain... is Sylomer price lower than EPDM rubber??[/b]

[the dreamer]

Does I need to include the walls ande ceiling weight?

If you make a real room in room construction, you have to take it into account. This means that the wall sits on the floating floor and the ceiling sits on the wallstuds.

I try to find Sylomer dealers in spain... is Sylomer price lower than EPDM rubber??[/

I have no idea. The Sylomer I'm going to use is the same as Paul W used: Sylomer P25 which will cost me around € 250,- per m². It is the same as with EPDM, you just need pucks.

If you're interested in one well made floating floor read Paul W's thread at Studiotips.

The manufacturer of this is Getzner Werkstoffe (www.getzner.at).
If you go for Sylomer, they will also do the calculations you need.

Florian

[hugo_inside]

250€ / m2 !!!! wooow!! I will buy EPDM rubber for 180€ m2. how much weighs a square meter of :

- 2 plies of 15 mm sheetrock
- 40 mm rockwool 70 kg/m3
- Steel framing

??

[the dreamer]

how much weighs a square meter of :

- 2 plies of 15 mm sheetrock
- 40 mm rockwool 70 kg/m3
- Steel framing

There are a lot of different drywalls. The one I intend to use is 17,7 kg/m² 15mm Knauf Vidiwall).
Others, for instance Rigips RF 15 (Firesafe) is 13 kg/m² or RB 12,5 (standart wall) is 9 kg/m².

So you gotta check that out with the manufactor.

[hugo_inside]

in this case my aprox weigh of each room is 3000 kg for CR and 2800 for recording room...

[hugo_inside]

Sylomer P25 which will cost me around € 250,- per m². It is the same as with EPDM, you just need pucks.

Today I call to the Spanish dealer of Sylomer, the secretary told me Sylomer P25 costs 413€ - per m2 !!!!!

Definitely I go for EPDM rubber [/b]