Technical Booklet G Resistance to the Passage of Sound·Page 47·2.83
Junctions with internal concrete floors
Internal concrete floors should be built into type 2 separating walls and carried through to the cavity face of the leaf, with the cavity remaining unbridged.
Internal concrete floors should generally be built into a type 2 separating wall and carried through to the cavity face of the leaf. The cavity should not be bridged (see Diagram 2.24).
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet G - Resistance to the Passage of Sound.pdf