I think you might be disappointed if you are expecting a miraculous change.
Most of the noise is carried on the framing (i.e. joist) and while filling the cavity will help, it won't be a cure all.
By the way, any fibrous insulation will work just fine but the denim will be safer to be left exposed.
In terms of covering it, just some insulation webbing should be fine but check with fire code.
Most of the noise is carried on the framing (i.e. joist) and while filling the cavity will help, it won't be a cure all.
By the way, any fibrous insulation will work just fine but the denim will be safer to be left exposed.
In terms of covering it, just some insulation webbing should be fine but check with fire code.