[mikeeastman]

I'm building some acoustic panels and found this insulation that has same R-vaule as fiberglass and a slightly higher acoustical values. It is made from recycled blue jeans, it comes as batts or loose and also 2" thick with radiant barrier Pictured here (made for hot water heater blankets). Here is link to manufacture and Homedepot  also carries some.
  http://architypesource.com/vendors/232-bonded-logic-inc

[Letitroll98]

Yes, I saw it in HD when I was looking for something not fiberglass and formaldehyde.  I settled on Rockwool, the Safe 'n Sound product.  The bluejeans stuff looks kewl, let us know how it works out.   

[Phil A]

The blue jeans stuff looks nice.  I'll have to look in Home Depot next time

[mikeeastman]

Not all Home Depot carry it but they sell it on line.

[Phil A]

Thanks - found the link - http://www.homedepot.com/webapp/wcs/stores/servlet/Search?keyword=hot+water+heater+blanket&langId=-1&storeId=10051&catalogId=10053

[bpape]

Yes.   That can work very well pending the aplication.


Just look very carefullly at price.

Bryan

[mikeeastman]

I paid $73 for about 60' of 3 1/2" deep X 2' wide. which works out to about $1.60 per sq foot. I also got a piece 75" long X 2"deep X 4' wide with a foil face on one side( hot water heater blanket), cost $37 with freight, about $1.55 per sq foot.

     Mike

[DTB300]

Another great company to look at for either Bulk Acoustical Cotton or Bonded Acoustical Cotton is:

http://sensiblesoundsolutions.com/

They also carry many other products for DIY Acoutical Treatments.

I prefer the Acoustical Cotton over Fiberglass....

[Atlplasma]

A similar discussion is occurring at http://www.audiocircle.com/index.php?topic=94447.new#new

It might be advisable to consolidate the threads.

[mtbdudex]

I used OC705 for my rear wall corner broadband superchunk bass traps (34" x 24" x 24"), itchy stuff as everyone here knows. 
Someone on AVS suggested this stuff.  http://www.acoustimac.com/index.php/diy-acoustic-materials/acoustic-insulation-material/ecoinsul422.html

I got some, and comparing its specs to OC705 seemed better at low freq 100 - 125hz and jusr slightly lower @ 250hz (0.63 vs OC705 @ 0.71).

From the acoustimac website info:

Sound Absorption Coefficients (1/3 Octave Band Center Frequencies. HZ)

Hz
   100   125   250   500   1000   2000   4000
2" Thickness   0.38   .39   .63   1.18   1.11   1.06   1.09

An even greener alternative to cotton insulation:

Cotton insulation works as well as its fiberglass counterparts, however this material can be prone to mold and is not as biodegradable and recyclable as cellulose which is made from recycled newspapers and cardboard products.

Better Performance than Fiberglass!

Oh yes, it’s true! This cellulose based insulation has even higher absorption coefficients than our standard insulation material, so not only is it more eco-friendly, it also outperforms its fiberglass and mineral wool counterparts hands down.

Freq   125 HZ   250 HZ   500 HZ   1000 HZ   2000 HZ   4000 HZ   NRC
OC-703 (2")   0.17   0.86    1.14   1.07   1.02   0.98   1.00

Freq   125 HZ   250 HZ   500 HZ   1000 HZ   2000 HZ   4000 HZ   NRC
OC-705   0.16   0.71    1.02   1.01   0.99   0.99   0.95

Therefore, I used it to make upper corner broadband bass traps and my front wall corner broadband bass traps.

Rear wall upper trap


Putting on the Kraft paper to block mid-hi frequencies:


1st one wrapped and done!
Those drywall edges made all the difference, I'm going to add those as lesson learned to lower bass trap post.  Much crisper look.




Installing into the HT room.
I used a 30+ year old hydraulic bottle jack as 3rd hand...




Front wall (not covered in this pict....got it done just before this HT meet held 5/14/2011)