Inter-Tenancy Sound Control

The New Zealand Building Code requires a Sound Transmission Class and Impact Insulation Class of STC 55and IIC 55 between habitable spaces in multi-unit residential buildings. A 5-point performance reduction isdeemed acceptable on site. Winstone Wallboards, New Zealand’s largest supplier of gypsum plasterboard, hasdeveloped, tested and published an extensive range of Gib® inter-tenancy sound control systems. This paperdescribes development work and experiences with actual installations and on-site testing. Details for wall andfloor/ceiling junctions are discussed.