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Mass per unit area of walls - calculation method
2.11NI-wide·Technical Booklet G Resistance to the Passage of Sound
The mass per unit area of a wall is expressed in kilograms per square metre (kg/m2). The method for calculating mass per unit area is given in Appendix A.
soundstructuralTie type A for masonry cavity walls
2.19NI-wide·Technical Booklet G Resistance to the Passage of Sound
Connect the leaves of a cavity masonry wall only where necessary by wire type (butterfly) ties as described in BS EN 845-1 and spaced as required for structural purposes, see BS 5628-3 which limits th
soundstructuraldwellingflatsTie 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-domesticdwellingWall tie dynamic stiffness measurement
2.21NI-wide·Technical Booklet G Resistance to the Passage of Sound
Measurements of the wall tie dynamic stiffness, kXmm, should be carried out according to BRE Information Paper, IP 3/01.
soundstructuralCalculation of number of ties per square metre
2.22NI-wide·Technical Booklet G Resistance to the Passage of Sound
The number of ties per square metre, n, is calculated from the horizontal and vertical tie spacing distances, Sx and Sy in metres using n = 1 / (Sx.Sy). Example: for horizontal and vertical tie spacin
soundstructuralUse of dynamic stiffness data for different cavity widths
2.23NI-wide·Technical Booklet G Resistance to the Passage of Sound
If kXmm is not available for the required cavity width, it is acceptable to use available kXmm data for X mm values less than the required cavity width to calculate n.kXmm.
soundstructuralJunctions with timber ground floors
2.84NI-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.
non-domesticdwellingsoundstructuralJunctions with loadbearing framed internal walls
2.111NI-wide·Technical Booklet G Resistance to the Passage of Sound
Loadbearing framed internal walls should be fixed to the masonry core through a continuous pad of mineral wool (see Diagram 2.32).
soundstructuralWall type 3.1 and 3.2 - suspended concrete floor mass requirement
2.123NI-wide·Technical Booklet G Resistance to the Passage of Sound
A suspended concrete floor may only pass under the solid masonry core of a type 3.1 or 3.2 separating wall if the floor has a mass per unit area of at least 365 kg/m2.
soundflatsdwellingstructuralWall type 3.1 and 3.2 - hollow core and plank floors prohibited
2.124NI-wide·Technical Booklet G Resistance to the Passage of Sound
Hollow core concrete plank and concrete beams with infilling block floors should not be continuous under the solid masonry core of a type 3.1 or 3.2 separating wall.
soundflatsdwellingstructuralMass requirement for internal masonry walls
3.40NI-wide·Technical Booklet G Resistance to the Passage of Sound
The mass per unit area of any loadbearing internal wall or any internal wall rigidly connected to a separating floor should be at least 120 kg/m2 excluding finish.
soundflatsstructuralJunctions with separating wall type 4 – timber frames with absorbent material
3.55NI-wide·Technical Booklet G Resistance to the Passage of Sound
Seek specialist advice.
soundstructuralStructural assessment for wall and floor treatments
4.14NI-wide·Technical Booklet G Resistance to the Passage of Sound
Wall and floor treatments will impose additional loads on the existing structure. The structure should be assessed to ensure that the additional loading can be carried safely, with appropriate strengt
soundstructuralmaterial-change-of-useSeparation distance and ceiling height considerations
4.27NI-wide·Technical Booklet G Resistance to the Passage of Sound
Note – This construction involves a separation of at least 125 mm between the upper surface of the independent ceiling and the underside of the existing floor construction. However, structural conside
soundstructuralSimplified equations for single leaf wall with blocks laid flat
A3.1NI-wide·Technical Booklet G Resistance to the Passage of Sound
Example of single leaf wall, blocks laid flat d = 0.010 m T = 0.215 m L = 0.450 m H = 0.110 m V = 0 m³ pm = 1800 kg/m³ No surface finish Mass per unit area = (20.20 x MB) + 43.00 kg/m² Substituting fo
soundstructural