SEPARATING WALLS (NEW BUILDINGS) SOUNDPROOFING
Do not
- Do not try and convert a cavity separating wall to a type 1 (solid masonry) separating wall by inserting mortar or concrete into the cavity between the two leaves.
- Do not use deep sockets and chases in the separating wall, and do not place sockets back to back.
- Do not create a junction between a solid wall type 1 and a cavity wall type 2 in which the cavity wall is bridged by the solid wall.
2.33 Wall type 1.1 Dense aggregate concrete block, plaster on both room faces (see Diagram 2-2)
minimum mass per unit area including plaster 415 kg /m2
13 mm plaster on both room faces
use blocks that are laid flat to the full thickness of the wall
Example of wall type 1.1
The required mass per unit area would be achieved by using
- 215 mm block laid flat
- block density 1840 kg /m3
- 110 mm coursing
- 13 mm lightweight plaster (minimum mass per unit area 10 kg /m2) on both room faces
This is an example only. See Annex A for a simplified method of calculating mass per unit area. Alternatively use manufacturer’s actual figures where these are available.
Diagram 2-2: Wall type 1.1
2.34 Wall type 1.2 Dense aggregate concrete cast in-situ, plaster on both room faces (see Diagram 2-3)
minimum mass per unit area including plaster 415 kg /m2
plaster on both room faces
Example of wall type 1.2
The required mass per unit area would be achieved by using
- 190 mm concrete
- concrete density 2200 kg/m3
- 13 mm lightweight plaster (minimum mass per unit area 10 kg /m2) on both room faces
This is an example only. See Annex A for a simplified method of calculating mass per unit area. Alternatively use manufacturer’s actual figures where these are available.
Diagram 2-3: Wall type 1.2
Resistance to the passage of sound 19