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Separating walls and associated flanking constructions for new buildings
0.2NI-wide·Technical Booklet G Resistance to the Passage of Sound
Section 2 – Separating walls and associated flanking constructions for new buildings, gives a range of wall constructions which, if properly designed and constructed, should provide reasonable resista
dwellingnew-buildingsoundseparating-wallsGeneral principles for wall types
2.1, 2.2, 2.3NI-wide·Technical Booklet G Resistance to the Passage of Sound
This section gives examples of wall types which, if built correctly, should achieve the performance standards set out in Table 1a of the section entitled "Guidance - Performance and introduction to pr
soundseparating-wallsWall type 1: Solid masonry
2.4NI-wide·Technical Booklet G Resistance to the Passage of Sound
The resistance to airborne sound depends mainly on the mass per unit area of the wall.
soundseparating-wallsWall type 2: Cavity masonry
2.5NI-wide·Technical Booklet G Resistance to the Passage of Sound
The resistance to airborne sound depends on the mass per unit area of the leaves and on the degree of isolation achieved. The isolation is affected by connections (such as wall ties and foundations) b
soundseparating-wallsWall type 3: Masonry between independent panels
2.6NI-wide·Technical Booklet G Resistance to the Passage of Sound
The resistance to airborne sound depends partly on the type and mass per unit area of the core, and partly on the isolation and mass per unit area of the independent panels.
soundseparating-wallsWall type 4: Framed walls with absorbent material
2.7NI-wide·Technical Booklet G Resistance to the Passage of Sound
The resistance to airborne sound depends on the mass per unit area of the leaves, the isolation of the frames, and the absorption in the cavity between the frames.
soundseparating-wallsRanking of constructions within wall types
2.8NI-wide·Technical Booklet G Resistance to the Passage of Sound
Within each wall type the constructions are ranked, as far as possible, with constructions providing higher sound insulation given first.
soundseparating-wallsSeparating wall junction methods with external cavity walls
2.37NI-wide·Technical Booklet G Resistance to the Passage of Sound
The separating wall should be joined to the inner leaf of the external cavity wall by one of the following methods – (a) Bonded. The separating wall should be bonded to the external wall in such a way
soundflatsdwellingseparating-wallsexternal-wallsJunctions with internal timber floors
2.82NI-wide·Technical Booklet G Resistance to the Passage of Sound
If the floor joists are to be supported on the separating wall then they should be supported on hangers and should not be built in (see Diagram 2.23).
soundseparating-wallstimber-floorsJunctions with internal concrete floors
2.83NI-wide·Technical Booklet G Resistance to the Passage of Sound
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).
soundseparating-wallsconcrete-floors