classical editing/mastering studio build

[Yannick]

Well, we are actually quite close to Brussels airport.
99% of the time it is quite soft and almost gone in the background noise.
0.9% you can consciously hear them.
0.1% is very loud, typically the overweight and way too old 747 freight planes.

I'm always happy they do take off and gain height, instead of landing in our backyard

[Ido]

Y,
now that I've got more of a feel for ur project, remembering that back wall diffuser u talked of, and seeing that you'll have what seems to be an excellent space (volume+dimensions/ratios), I'd suggest leaving this back wall diffuser issue undecided till the very end, and do it like you would sample fine single malts.

[Yannick]

IDo,

Thanks, that is what I am planning to do. I don't want to rush the acoustic treatment. Probably some superchunkcs first.

But you have to know, this room is almost like a 6 year old single malt if such a thing exists ...

[Scott R. Foster]

Not for long once I get ahold of it.

[Ido]

Not for long once I get ahold of it.

I'm closer

Bert is closest, but I think he's more into horsepower, unlike you, vintage air cooled efficiency man (so all the American-European stereotypes go down the drain with you 2, as do ther things )

[bert stoltenborg]

My beer is 11.6 horsepower

[Yannick]

I was thinking more among these lines

http://www.thewhiskyexchange.com/B-40-Port_Ellen.aspx

[Yannick]

This is last week, half a day work and some beams are already up !

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[Yannick]

This is Fabian, who is glueing and screwing everything together, I just give him pieces that fit.
He made quite an accurate plan, and we try to stick to it.

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[Yannick]

Air evacuation, max 120 m3/hour, with enough silencers (three between the room and the machine or any other room). Air supply is at the other end of the room.

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[Yannick]

Don't ask me what this is, I won't answer it
I think many will disagree...

Anyway, you can also detect some extra boxes, with power for the lights. I added them to exclude any leaks when we put the light in.

ceiling beams5.jpg (92.28 KiB) Viewed 9469 times

[Yannick]

And then, glasswool galore. It's about 16 cm thick to dampen the 29 cm of air gap above the finished ceiling.

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[Yannick]

I just discovered we hid an alarm sensor behind a wall.
I just forget to unscrew it and put it on the new wall



I can probably still reach it

Well, if not, it'll cost me a new one...

[Ido]

big question is what's gonna be the final covering for the ceiling,
ah, the suspense..

[Yannick]

As my mother would say, this sounds VERY good already, why would you need to do all that work.

So I'll probably leave it this way



Actually, she said the same thing after the outer walls were treated with the rockwool, when a metallic flutter from hell was quite apparant. Maybe i shouldn't trust herjudgement

[Yannick]

The last two days we started and nearly finished the first layer of the ceiling.
Some small pieces in the middle left, but the next three weeks I'm too busy to continue the build, and someone will come and plaster the walls for me.
This way, the seams between the first layer of the ceiling and the walls will be covered once by caulking them and a second time because the walls will get 1 cm thicker.

Begin april we'll add the second and third layers, with greenglue between them.

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This pile is enough for the second layer:

second layer.jpg (85.99 KiB) Viewed 9448 times

[Scott R. Foster]

getting close!

[Yannick]

Finally, an update.
The plastering has been done last week.
I also started work on the outer window, there were still some weak spots around the window, and the thing was not airtight yet.
Quite happy with the result, I already have a lot less noise coming in, seems double glass with an outer sheet of 2x4mm with a safety foil in between, 15mm gap and a 6 mm inner sheet is stopping some noise
The plan is to put a single acoustic glass in the inner wall 8mm/double film/6mm - which is only about 1dB worse than twice 8mm, but somehow manages to get 10% more light transmission.
The window assembly will have slightly worse isolation than the walls, but I'm not worried about outside noise. And leakage from the inner glass into the airgap will be blocked.

We also completely finished the first layer of the ceiling.
Tomorrow we start using greenglue on the second layer !

I'll try to put some pics up tomorrow.

BTW, I also got some acoustic sealant of the greenglue company. It may or may not be better than standard professional grade sealant, but it is a lot more fun to work with ! This stuff is so easy to apply, and when it dries it really does some funky stuff. I also noticed you can also seal really tiny pores with it.

[Yannick]

Hmm, we did about 30% of the second layer of the ceiling, with the normal Greenglue dosage.
The really weird thing is, the walls seem to become less resonant as well.
I am 100% sure this is not only because of the extra ceiling weight, as for the moment we are not adding that much mass, compared to what is already up there, and the mass of the walls themselves.
It is also not the suspension under the floor that is reacting differently, because all the panels that went up were already inside the studio.

Is there any remote possibility that by creating this huge dampened surface (the ceiling with greenglue), that is actually very well coupled to the walls, that the wall resonances are starting to get dampened too ?
Somehow this does not feel entirely strange, as the walls are about 70m2, the ceiling is approx 40m2.

This may sound too good to be true, and if true, I will vow my eternal fidelity to this product !

[Yannick]

Well, it has been a while, and work on the studio was happening in bits and pieces. I had too many recordings and editing deadlines ...
The ceiling has been finished, three layers of 12.5 mm Fermacell with two layers of greenglue. The finishing layer has also been done (some kind of white plaster/paint with a 0.5 grain in it, so you end up with a slight texture, say 1-2mm).
The good news is, now I have some light in the room !

I have to say, those three layers plus 2x GG really made the ceiling very un-resonant, and quite heavy. The weight of the ceiling is around 45 Kg/m2, wooden beams included. As a comparison, my walls must be around 300 Kg/m2.

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