A bit of follow-up... Here's a quote from Paul Woodlock over at StudioTips:
Paul wrote:After designing a room within a room with high mass walls, the weak link then becomes the floor. So for those ( Like me ) who need a LOT of soundproofing the floating floor is desirable.
The cons of a floating floor is that it's a] expensive, b] Heavy, which usually means ground floor ( or basements ) only, and c] must be calculated properly.
. . .
A lot of the methods don't really work properly. Sadly floating floors are the victim of misinformation, and there's been many floating floors built in DIY studios ( and even some pro studios ) that a] are pointless or b] don't work. or c] both. (Source)
If you don't already know who Paul is, spend a few days reading his studio build diary, and you'll have a much better appreciation of what it takes to float a floor properly.
I've found a product at Lowes that might assist in floating a floor.
Check out the website. It will tell you more about it than I could. http://www.subflor.com
