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Cavity wall closure requirements for floor type 2
3.69NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where the external wall is a cavity wall – (a) the outer leaf of the wall may be of any construction; and (b) the cavity should be closed with a cavity stop (see Diagram 3.16) ensuring adequate draina
soundfloor-junctionsexternal-wallMasonry inner leaf mass requirement for external cavity walls
3.70NI-wide·Technical Booklet G Resistance to the Passage of Sound
The masonry inner leaf of an external wall cavity wall should have a mass per unit area of at least 120 kg/m2 excluding finish.
soundfloor-junctionsexternal-wallmasonry