Acoustic hanger thickness?

[jazzman]

I'm not sure I've got this right. I've read that your acoustic hangers are 18 mm, i.e. 3/4 inches thick, but also that they're 3/8" thick. Is the thickness dependent on the overall size? What works best for what kind of frequencies?

And what kind of insulation can you wrap around it and how thick should that be?

By "fiberboard" do you mean what's called Masonite in the US, that is, the stuff they make pegboard from?

Thanks for clearing this up.

Lee

[John Sayers]

No it's not masonite - it's called cellotex I think in the US. It's normally 1/2" thick and is a soft fiberboard. The insulation is normally just standard fibreglass batt.

cheers
john

[jazzman]

Celotex makes a lot of acoustical ceiling panels:
http://www.us.bpb-na.com/ceiling/celotex.html

Do you possibly mean something like Homasote?
http://www.homasote.com
"Sound deadening, insulating, tackable, structural, environmentally friendly building materials from recycled post-consumer waste paper."

or Homasote 440 Sound Barrier?
http://www.homasote.com/sb.html

Lee

[krish]

what about the insulation thickness it should be 25.....50 or 75 mm?

[jazzman]

The thinnest insulation batts available here in the US are 3 inches (75 mm). This design of John's
http://www.johnlsayers.com/Studio/PDF%2 ... r_Wall.pdf
shows spacing of 200 mm between hangers, which would nicely allow for 3 inches of batting on either side, plus a little air.