20 cm panels, 65 kg/m3 vs 40 kg/m3
Old 30th November 2011
  #1
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Bjorn Omholt's Avatar
 

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20 cm panels, 65 kg/m3 vs 40 kg/m3

Can anyone with a calculator show the difference between 20 cm rockwool panels of 65 kg/m3 vs. 40 kg/m3 density flushed to the wall?
I don't have the gas flow numbers.

If 65 kg/m3 works better for 20 cm, I would also be intesting knowing at what depth 40 kg/m3 starts to perform better.

Would be nice to see the difference between 10 cm with 10 cm airgap and 20 cm flushed to the wall as well. Or 15 cm with 5 cm airgap.......
Old 3rd December 2011
  #2
Gear Maniac
 

I do not have that calculator. The inserted diagram, I copied from a GS thread, might originate from Jens E (? ).

In Bradford Insulation´s "Acoustic Insulaton Design Guide" is mentioned as below, should give you an indication. Probably, the missing densities can be found with some googling. I do not think rockwool of same density and type should show large differences just because of its manufacturer.

Rockwool
Fibertex 350, Airflow resitivity, 13000, density xxx kg/m³
Fibertex 450, Airflow resitivity, 22000, density 60 kg/m³
Fibertex 450, Airflow resitivity, 33000, density 80 kg/m³
Fibertex 650, Airflow resitivity, 53000, density xxx kg/m³
Fibertex HD, Airflow resitivity, 70000, density xxx kg/m³

Glass wool
Glass wool building blankets, Airflow resitivity, 5600, density xxx kg/m³
Multitel, Airflow resitivity, 15300, density 18 kg/m³
Flexitel, Airflow resitivity, 16200, density 24 kg/m
Supertel plain, Airflow resitivity, 18200, density 32 kg/m³
Supertel+foil, Airflow resitivity, 23400, density 32 kg/m³
Ultratel plain, Airflow resitivity, 31500, density 48 kg/m³
Ultratel+foil, Airflow resitivity, 30300, density 48 kg/m³ => why lower?
Quietel, Airflow resitivity, 55600, density 130 kg/m
Attached Thumbnails
20 cm panels, 65 kg/m3 vs 40 kg/m3-200mm-panel-different-flow.gif  
Old 4th December 2011
  #3
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Bjorn Omholt's Avatar
 

Thread Starter
Quote:
Originally Posted by Adhoc View Post
I do not have that calculator. The inserted diagram, I copied from a GS thread, might originate from Jens E (? ).

In Bradford Insulation´s "Acoustic Insulaton Design Guide" is mentioned as below, should give you an indication. Probably, the missing densities can be found with some googling. I do not think rockwool of same density and type should show large differences just because of its manufacturer.

Rockwool
Fibertex 350, Airflow resitivity, 13000, density xxx kg/m³
Fibertex 450, Airflow resitivity, 22000, density 60 kg/m³
Fibertex 450, Airflow resitivity, 33000, density 80 kg/m³
Fibertex 650, Airflow resitivity, 53000, density xxx kg/m³
Fibertex HD, Airflow resitivity, 70000, density xxx kg/m³

Glass wool
Glass wool building blankets, Airflow resitivity, 5600, density xxx kg/m³
Multitel, Airflow resitivity, 15300, density 18 kg/m³
Flexitel, Airflow resitivity, 16200, density 24 kg/m
Supertel plain, Airflow resitivity, 18200, density 32 kg/m³
Supertel+foil, Airflow resitivity, 23400, density 32 kg/m³
Ultratel plain, Airflow resitivity, 31500, density 48 kg/m³
Ultratel+foil, Airflow resitivity, 30300, density 48 kg/m³ => why lower?
Quietel, Airflow resitivity, 55600, density 130 kg/m
Thanks Adhoc. Do you know if the graph you posted shows rockwool or fiberglass?
Unfortunately I can't the Porous absorber calculator to work with OpenOffice:
Porous Absorber Calculator V1.58
Old 4th December 2011
  #4
Gear Maniac
 

No, I can´t remember which thread I copied the graph from. Should not matter though, glass fibre or rockwool, numbers are numbers. (Except maybe, if availble space and thickness of the wool is an important issue).
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