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Definitions of Building Elements and Spaces
NI-wide·Technical Booklet G Resistance to the Passage of Sound
Separating wall and separating floor means respectively a wall or floor (including a stair) separating a dwelling or room for residential purposes from – (a) another dwelling or another building; or (
sounddwellingexternal-spaceTie type B for external masonry cavity walls
2.20NI-wide·Technical Booklet G Resistance to the Passage of Sound
Connect the leaves of a cavity masonry wall only where necessary by wire type (double-triangle) ties as described in BS EN 845-1 and spaced as required for structural purposes, see BS 5628-3 which lim
soundstructuralexternal-spacenon-domesticdwellingJunction requirements for wall type 1 with external cavity walls
2.36NI-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 2.5) unless the cavity is full
soundexternal-spaceMasonry inner leaf mass requirement for external cavity walls
2.38NI-wide·Technical Booklet G Resistance to the Passage of Sound
The masonry inner leaf should have a mass per unit area of at least 120 kg/m2 excluding finish. However, there is no minimum mass requirement where there are openings in the external wall (see Diagram
soundexternal-spaceseparating-wallExternal cavity wall - cavity closure requirement
2.40NI-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 2.9).
non-domesticdwellingsoundexternal-spaceExternal cavity wall closure at eaves
2.57NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where there is an external cavity wall, the cavity should be closed at eaves level with a cavity stop e.g. mineral wool (see Diagram 2.14). Note – A rigid connection between the inner and external wal
soundexternal-spaceJunction requirements for external cavity walls with masonry inner leaf
2.71NI-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 (for wall types 2.1 and 2.2 see Diagram 2.1
non-domesticsoundexternal-spaceFramed inner leaf of external cavity wall - construction and finishing
2.76NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where the inner leaf of an external cavity wall is of framed construction, the framed inner leaf should – (a) abut the separating wall; and (b) be tied to it with ties at not more than 300 mm centres
soundexternal-spacenon-domesticExternal cavity wall closure at eaves level
2.91NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where there is an external cavity wall, the cavity should be closed at eaves level with a cavity stop e.g. mineral wool (see Diagram 2.26). A rigid connection between the inner and external wall leave
soundexternal-spaceCavity closure requirements for external cavity walls
2.104NI-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 2.31) unless the cavity is ful
non-domesticsoundexternal-spaceMasonry inner leaf bonding and lining requirements
2.105NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where the inner leaf of an external cavity wall is masonry – (a) the inner leaf of the external wall should be bonded or tied to the masonry core; and (b) the inner leaf of the external wall should be
non-domesticsoundexternal-spaceMass requirement waived for lined masonry inner leaf without separating floor
2.107NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where there is no separating floor and the masonry inner leaf of the external wall is lined with independent panels in the same manner as the separating walls, there is no minimum mass requirement on
non-domesticsoundexternal-spacePlaster or plasterboard finish for masonry inner leaf without separating floor
2.108NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where there is no separating floor with separating wall type 3.1 or 3.3, and the masonry inner leaf of the external wall has a mass of at least 120 kg/m2 excluding finish, then the inner leaf of the e
non-domesticsoundexternal-spaceJunctions with external cavity walls with timber frame inner leaf
3.36NI-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; (b) the cavity should be closed with a cavity stop; and (c) the wall finish of the inner leaf of t
soundexternal-spaceflatsJunctions with external solid masonry walls
3.37NI-wide·Technical Booklet G Resistance to the Passage of Sound
Seek specialist advice.
soundexternal-spaceFloor base in cavity masonry external walls
3.71NI-wide·Technical Booklet G Resistance to the Passage of Sound
The floor base (excluding any screed) should be built into a cavity masonry external wall and carried through to the cavity face of the inner leaf. The cavity should not be bridged.
soundexternal-spaceseparating-floorFloor 2.2B joint positioning
3.72NI-wide·Technical Booklet G Resistance to the Passage of Sound
Where floor 2.2B is used and the planks are parallel to the external wall the first joint should be a minimum of 300 mm from the cavity face of the inner leaf (see Diagram 3.16).
soundexternal-spaceseparating-floorCavity wall with timber frame inner leaf
3.74NI-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; (b) the cavity should be closed with a cavity stop; and (c) the wall finish of the inner leaf of t
soundexternal-spaceseparating-floorSolid masonry external wall junctions
3.75NI-wide·Technical Booklet G Resistance to the Passage of Sound
Seek specialist advice.
soundexternal-spaceseparating-floor