On a staggered wall designed to be soundproof, my multiple layers of sheetrock will end up about 1"-1 1/4" from the concrete subfloor. This is a bit high (although the floor plate will be covered).
One solution would be to cut off 7" from the bottom sheets of the bottom layers and add a 7 1/2" strip. This will give me 1/2" to 3/4" from the concrete, but may limit my options later (floor-wise). Additionally, a 3/4" or so strip of sheetrock along the bottom (multiple layers) would tend to be crumbly and unstable.
The question: is there a better way to approach this, i.e., a sound dampening foam or rubber stripping (both of which should be able to receive caulk) that could be applied after the floor is in?