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Wall ties in separating cavity masonry walls
2.64NI-wide·Technical Booklet G Resistance to the Passage of Sound
The wall ties used to connect the leaves of a cavity masonry wall should be tie type A.
soundseparating-wallmasonryBlocks with voids
2.66NI-wide·Technical Booklet G Resistance to the Passage of Sound
The guidance describes constructions that use blocks without voids. For blocks with voids, seek advice from the manufacturer.
soundmasonryWall type 2.1 – Dense aggregate concrete block with cavity
2.67NI-wide·Technical Booklet G Resistance to the Passage of Sound
Two leaves of dense aggregate concrete block with 50 mm cavity, plaster on both room faces (see Diagram 2.15) – minimum mass per unit area including plaster 415 kg/m2; minimum cavity width of 50 mm; 1
soundseparating-wallmasonrycavity-wallWall type 2.2 – Lightweight aggregate block with cavity
2.68NI-wide·Technical Booklet G Resistance to the Passage of Sound
Two leaves of lightweight aggregate block with 75 mm cavity, plaster on both room faces (see Diagram 2.16) – minimum mass per unit area including plaster 300 kg/m2; minimum cavity width of 75 mm; 13 m
soundseparating-wallmasonrycavity-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-wallmasonryFloor type 2.1C – Junctions with separating wall types 3.1 and 3.2 (solid masonry core)
3.87NI-wide·Technical Booklet G Resistance to the Passage of Sound
A separating floor type 2.1C base (excluding any screed) should pass through separating wall types 3.1 and 3.2 (see Diagram 3.19).
soundseparating-floorwall-type-3masonry