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Technical Booklet G Resistance to the Passage of Sound·Page 89·3.127

Floor joists support on separating wall type 3 – masonry between independent panels

Floor joists supported by a separating wall type 3 must be installed on hangers rather than built in directly.

soundseparating-wall
If floor joists are to be supported by the 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