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Technical Booklet G Resistance to the Passage of Sound·Page 37·2.49

Junctions with timber ground floors

Floor joists supported on a type 1 separating wall must be supported on hangers and should not be built in to the wall.

soundtimberseparating-wallground-floor
If the floor joists are to be supported on a type 1 separating wall then they should be supported on hangers and should not be built in.

Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet G - Resistance to the Passage of Sound.pdf