classical editing/mastering studio build

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classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 9:31 am

Well, after three years here we are !
I'll be building a classical music editing/mastering room, inside our new house. On the ground floor (actually 0.6m below ground floor) we left an open space of 42 m2, 3.5m high.
Due to the terrain shape the house has one wall severely angled, and I wanted enough room for a 5.1 setup, so the idea was born to go with angled walls.
Without restarting a discussion about this, in this case angled walls gave me maximum volume, a rectangular room would have been much smaller !
Alternatively, there would have been no entrance door to the house or no entrance to the storage room - remember it is actually a private house (and no I will not post plans of the entire ground floor).

The finished room will be 4.90m (front wall)/6.26m(long back wall) to 6.8m (length) and 2.95 m high. This gives a nice distribution in bobgolds room modes calculator, when I enter the mean value as the width of the room.
Room Ratio: 1 : 1.89 : 2.3

The outer construction is a 30 cm concrete slab, with cellular concrete walls (24cm thick). The slab has been engineered to support the weight of the studio, approx 40.000 Kg. The upper floor or roof of the outer structure of the studio is a 25cm self-supporting concrete slab.
The room is a fully floating construction, 16 cm concrete (with floor heating in the floating slab) on sylomer strips, 15 cm Silka walls (1800 Kg/m3, "limesandstone" a mix of 90% sand, 7% lime and 3% water, which gives quite an inert material), 23 cm wooden beams on top which support 3 layers of fermacell (sheetrock) with greenglue.
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studio plan.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 10:32 am

This was the inside:
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Studio1.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 10:44 am

This actually happened three years ago - oktober 2008:

Because the concrete floor (30cm on the ground) is not level, and quite bumpy and the deflection under load of the sylomer is only 1.5mm we decided to make a level construction. This way I increase the airgap to 9cm and it allows me to put thermal insulation (rockwool) - the concrete floor has floor heating - which will also improve the airgap.

To achieve this we put stripes of betonplex on cement - perfectly level. These will carry the sylomer. To increase the airgap and to avoid uneven deflection of the sylomer (the wooden casing for the concrete pour will bend under the weight - 1.5mm between the sylomer strips, which means the strips get more load on the sides than in their middle as they are 12cm wide - see pic2).

As Getzner considers even a 16cm concrete floor will bend, the suspension under the floor where the walls will come is stiffer then the rest of the floor.

susp close.jpg
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Studio1 leveling.jpg
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too level.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 10:48 am

A few days later came the 8cm of isolation and the casing for the concrete poor:

casing.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 10:52 am

19/10/2008:

here you can see the steel reinforcement of the concrete floor and the steel cable conduits underneaths, we blocked the entries with big bricks, so no concrete will go there...
We taped all seams of the wooden casing and put a plastic on top of it. No leaks allowed !
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steel gutters and reinforcement.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 10:58 am

This one I remember dearly, putting in the 240m of floor heating on top of the (floating) steel structure. The plastic tube is quite stiff and does not want to be put down, so you have to tie it every 20cm, while balancing on some steel wires ...
We did not realise at the time someone actually makes a handy tool for this, and we had to finish that day (and fill the tubes with water) because the concrete poor was next morning at 6.00 am !!!

I was in bed at 2.30 am and did not stop sweating until I woke up.
At 8pm I called the concrete floor guys where they were, and they forgot to phone me they were coming 4 days later :bang

(I know the distances between the tube are quite big, but I'll only need 500W to heat this space when it is -5 degrees C outside)

floor heating.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 11:01 am

24-10-2008:

The first time I let the polished concrete floor dry up a little bit (uncovering the plastic):

[attachment=0]polished concrete.jpg[/attachment
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Re: classical editing/mastering studio build

Postby Yannick » Mon Mar 05, 2012 11:03 am

After this there is a gap of 3 years, where I had to finish the private part of the house, move, get a second kid, work and earn some money.
The original plan was to have the studio finished before moving :oops:
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Re: classical editing/mastering studio build

Postby Ido » Wed Mar 07, 2012 6:12 pm

Bravo!
good luck,
what deflection are you supposed to get with the floating floor?
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Re: classical editing/mastering studio build

Postby Yannick » Wed Mar 07, 2012 6:33 pm

I could look it up, but I think it was 1.5 to 2 mm, resulting in 13 Hz resonance.
Which should give useful isolation above 30 hz, which we considered good enough for most classical work.
Cost and useful net height in the space were two constraints, if I would only do loud rock, I would have gone a few Hz lower.

But I did adapt the air gap under the floor (the suspension is 4,5 cm, airgap is 10 cm with 8 cm rockwool) so that the air spring isn't deteriorating the performace of the sylomer suspension.
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Re: classical editing/mastering studio build

Postby Ido » Wed Mar 07, 2012 7:43 pm

Yannick,
I'd appreciate it if you looked it up,
cause all that dedicated sylomer-gestner and only 2 mm.. i woulda thought more..
anyways, it's all impressive in a good way, hope it brings good things,
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Re: classical editing/mastering studio build

Postby Yannick » Wed Mar 07, 2012 7:58 pm

I thought more as well, I did a light floor 14 years ago, and deflection was around 40% (if I remember correctly). That was using Sylomer as well.
Now we did a 40 ton floating design and we have 1.99 mm deflection (unloaded spring is 37.5 mm) !

Werkstoff:Sylomer® LAnzahl:1Länge:7240 mmBreite:300 mmFläche:2172000 mm²Dicke:37,5 mmFormfaktor:3,8Masse:8565 kgDyn. Steifigkeit:59,7 kN/mmAuslastung:77 %Einsenkung:1,99 mmAbstimmfrequenz:13,3 Hz

That is Getzners result for two of the 4 walls.

But I can assure you the thing is floating, we already did some contact sound tests, and while we were building the walls (further down this thread which will become realtime in a short while) some kind of caterpillar type machine was driving up and down the street and shaking the house, which resulted in the studio in quite a nauseating experience (must have been shaking the ground around the resonance frequency :mrgreen: )
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Belgien Willox strip bearings.pdf
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Re: classical editing/mastering studio build

Postby Ido » Wed Mar 07, 2012 8:49 pm

thanks for the detailed info.

Yannick wrote:.. deflection was around 40% (if I remember correctly). That was using Sylomer as well.
...


it's usually 10-15% in most materials-springs.
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Re: classical editing/mastering studio build

Postby Yannick » Wed Mar 07, 2012 9:18 pm

here we start the walls. End of february 2012.
First some nice fluffly isolation is glued to the outer walls

wall iso1.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Wed Mar 07, 2012 9:18 pm

this is the way up

thewayup.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Wed Mar 07, 2012 9:20 pm

this is about 3500 Kg already carried inside, more to follow as we go up

blocks.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Wed Mar 07, 2012 9:21 pm

This is about half of the inner walls

halfway.jpg
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Re: classical editing/mastering studio build

Postby Yannick » Wed Mar 07, 2012 9:23 pm

And here we are finished with the walls.
The walls will be plastered after putting the first layer of the ceiling.

Next are the wooden beams which will carry the ceiling.

finished walls.jpg
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Re: classical editing/mastering studio build

Postby Scott R. Foster » Thu Mar 08, 2012 2:52 am

Wow!
SRF
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Re: classical editing/mastering studio build

Postby Bob » Thu Mar 08, 2012 4:21 am

I looked at that and thought, that's the way all buildings should be. Especially ones near airports.
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