Acoustic solution for double wall: the two walls are made with brick (120 mm thick) build on rubber stripe (6 mm thick). Acoustic insulation (20-40 mm thick) inside the cavity between the walls.
Acoustic solution for lightweight: structure in 50 mm metal frame in double layer with acoustic insulation panel (48 mm thick) between this ones. Finishing on both side with double layer of plasterboard (25 mm thick).
Improvement of airborne sound insulation of CLT wall (100 mm thick) with metal frame and double layer of plasterboard (25 mm thick) on both side. Acoustic insulation (48 mm thick) inside the cavity to get a very high acoustic performance.