I will be remodeling my family room which is located on the first floor in a split-level house. It currently has paneling which will be replaced with drywall. I am going to replace the insulation (rockwool batts) with fiberglass. My plans are to increase the wall width to 5.5 inches (by adding 2" of wood to the current 2 X 4) to allow higher R-value insulation. Does this sound reasonable? What about adding a vapor barrier between the insulation and the drywall? Is it worth the money and time?
I also want to sound-proof the walls and celing. Any suggestions? My idea is to use the thickest drywall as possible.
Any help is greatly appreciated.