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On reducing the noise from the upstairs above, while keeping the absorbtion for the lower room, I ran upon this idea.
Attach 2 layers of 5/8" sheetrock pieces to the bottom upstairs subfloor inside the floor joist cavity. Apply a layer of Green Glue in between the layers of sheetrock. Would have to measure the sheetrock screw length carefully, so as to not penetrate the floor upstairs.
Then add the fluffy insulation in the joists and fabric.
Would R30 insulation be better?
My joist width is 7.25" and the R30 is 9.25", so I'd have to compress it a bit inside the floor joists, even a bit more if I did the double sheetrock thing. I've found John Mansfield R30 rolls pretty cheap at Lowes, no chemicals added.
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