[geowak]

Does corkboard wall covering act as a decent acoustical room treatment? Has anyone used this?

[Ethan Winer]

In a word: No. Cork does absorb some, but not much. And the cork material I see is too thin to absorb at all at lower frequencies. The goal of room treatment is to absorb uniformly over a wide range of frequencies, not just at mid and high frequencies.

--Ethan

[rodge827]

You will have to go with much thicker about 1" to get any kind of result, and YMMV.
It can be purchased at McMaster-Carr:  http://www.mcmaster.com/#cork-insulation/=pjau1r

BTW if you go with cork wall covering it is easy to install.

Prep the wall properly with a good wall covering primer and use a heavy duty clear wall covering adhesive at full strength (do not thin it down).
Try not to get any adhesive on the face, and keep a lot of sharp blades handy.

Chris