GreenStuf® SOUND SOLUTION® is a 100% polyester acoustic insulation material designed for timber framed residential and light commercial applications. GreenStuf® SOUND SOLUTION® is supplied in segments and rolls pre-cut to fit standard timber framed walls and mid-floor joist spacings. GreenStuf® SOUND SOLUTION® can be used in timber framed walls and mid-floor cavities for reducing airborne sound transfer. SOUND SOLUTION® reduces resonating noise in the construction cavity thereby reducing the sound energy transferred from one side to the other. Further improvements can be achieved by using acoustically rated plasterboard, multiple layers of plasterboard, or by isolating the plasterboard from the stud. The New Zealand Building Code (NZBC) sets out minimum performance ratings for inter-tenancy walls and floor-ceiling construction. The performance of a construction system relies on the design, materials and installation. Acoustic design for NZBC compliance requires specialist design considerations.