Intermediate floor treated from ceiling below
To exceed Rw45
Ceiling lining below floor is removed, pack dense polyester absorption between joists, Polyroll85/20. Fix NoisebarBASE6kg to underside of joists, overlap joins 50mm staple and tape.
Line ceiling below with 2 x 16mm plasterboard or 1 layer 13mm SoundShield and Rw45 will be achieved.