A large portion of the home I'm designing/building has exposed timber joists from the first floor with 1.5" T&G exposed to below decking on top. I would like to minimize the noise between the upstairs and downstairs. Does anyone have any suggestions on how this can be achieved without an airspace as my design will not allow. I have heard of such options as a layer of homosote sandwhiched between the T&G and the subfloor but I'm not sure how this performs.