Elastic or rigid room in room walls

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Re: Elastic or rigid room in room walls

Postby Ido » Mon Aug 10, 2015 7:25 am

that's cool, Y,
btw, what's the density of these silka blocks?
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Re: Elastic or rigid room in room walls

Postby Yannick » Mon Aug 10, 2015 7:39 pm

They are 285 Kg/m2 for 15 cm thickness. (Take care, they also exist in a light version)
By comparison, the concrete blocks used in the study were 235 Kg/m2 for 190 mm thickness.
That is about half of real concrete.

Silka is quite heavy (especially the last row at 3m height, when your head is against the upper slab at 3m 25 so you have to lift them above your shoulders...), and, much less resonant when you tap it than a comparable brick or concrete structure.

But then, my mastering room thread ended with an open invitation to have lots of beer, so If you want to knock on the walls, be my guest :mrgreen:
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Re: Elastic or rigid room in room walls

Postby andrebrito » Wed Aug 12, 2015 5:40 pm

Hi,

You get around 40 dB at 100 Hz for a normal single stud wall using Gypsum and Green Glue with 40 mm thickness

Go to my website

http://www.someacustica.com/isolamento-acustico/

Check the graph of Green Glue. This measurement was done in Spain, through my company.

I think that by placing a well decoupled double stud wall with 100 mm air cavity plus Green Glue and gypsum you may get to 50 dB
at 100 Hz.. this is just my guessing
http://www.onlineacoustics.com - room acoustics projects and diffusers
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Re: Elastic or rigid room in room walls

Postby Yannick » Wed Aug 12, 2015 6:56 pm

Weird.
I based my decision on greengluecompany's own test data:

http://www.greengluecompany.com/download/file/fid/924

Which seems a better wall than yours (more airgap, more greenglue) but performs considerably worse at 100 Hz.
Only 31 dB.
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Re: Elastic or rigid room in room walls

Postby andrebrito » Wed Aug 12, 2015 7:08 pm

That's interesting....

I had an independent lab and company that asked me to supply them with GG because they wanted to make sure it worked as advertised

Now the results are quite different at lower frequencies...
http://www.onlineacoustics.com - room acoustics projects and diffusers
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Re: Elastic or rigid room in room walls

Postby bert stoltenborg » Wed Aug 12, 2015 7:10 pm

It takes a 100 mm brick wall with 160 mm gap and 2 x 25 mm gypsum to get 46 dB at 100 Hz.
With lightweigth constructions an 100 mm gap you'll never get over 40 dB.
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Re: Elastic or rigid room in room walls

Postby andrebrito » Wed Aug 12, 2015 7:51 pm

I have no idea about the differences on both tests so I leave this question open..

But this wall has a STC of 65 and 38 dB at 100 Hz, only made of gypsum and rockwool... so it might be possible to get higher values than 40 dB at 100 Hz
for a lightweight construction
http://www.kineticsnoise.com/arch/tests ... 001090.pdf
http://www.onlineacoustics.com - room acoustics projects and diffusers
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