Wall type 2.4 – Aircrete blocks with cavity and plasterboard or plaster finish

Two leaves of aircrete block with 75 mm cavity and plasterboard or plaster on both room faces (see Diagram 2.18) – minimum mass per unit area including finish 150 kg/m2; minimum cavity width of 75 mm; plasterboard, each sheet of minimum mass per unit area 10 kg/m2, on both room faces; or 13 mm plaster on both room faces. Note – Increasing the size of the step or stagger in the separating wall tends to improve the airborne sound insulation. The required mass per unit area would be achieved by using: 100 mm aircrete block leaves block density 650 kg/m3 plasterboard, each sheet of minimum mass per unit area 10 kg/m2 on both room faces