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Thanks for the VERY illuminating conversation. Here's the stuff [Enermax] i was telling you about. I think it's kinda like the Celotex.
Actually I was wondering If I could attach it to a RC-1 on the ceiling and then screw the 5/8" gypse to it? (Instead of 2 layers of 5/8" gypse) Much lighter and correct me if i'm wrong, but the STC rating seems better. Although, i'm sure i've missed something somewhere along the line... http://www.emcobp.com/en/02/p_02_01_01. ... _backid=28
STC ratings here: http://www.emcobp.com/en/08/p_08_02_02_01.aspx