I've been fitting-out a 635 SF basement for use as a shop/studio/storage area. New power has been run to ceiling lamps, wall outlets, and a heating system has been installed. Walls will get 7.5R blue styrofoam and drywall. As for the ceiling, I plan to use Batt insulation above 2-layers of drywall to mitigate sound transmission to the houshold lifing spaces above, (first sheet will be applied directly to the joist, second sheet applied with Z-Channel, I wanted to ask . . . should I screw new 2x10 sections perpendicular between the joist using liquid nails, or run 2x4's next to the joists and screw-up into the sub-floor, as well as screw the 2x's over into the joist, using liquid nails again . . . the intent here is to quite the squeaks in this 80 year old house while I have access to the 12'spans of 2 x 10 floor joists in the basement.