i have a layer of 1/8 mlv and a layer of 5/8 sheetrock on an existing walls of a room. i will next proceed to add the rsc1 with a 5/8 layer of sheetrock attached to the resiliant channel. my question is what is is worth to add a second layer of 5/8 sheetrock to the existing wall in terms of stc?
also is it ok to use sheetrock on top of plywood as a subfloor on which to build a floating room. i figured it would help in adding mass.