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GIB Intertenancy Barrier System

The system consists of a double timber frame wall with a 25mm thick plasterboard barrier between the frames. The primary fire resistance is provided by the central GIB Barrierline plasterboard barrier, with the GIB wall linings contributing to some extent. This allows the wall linings to be used for structural bracing and to incorporate untreated penetrations. The basis of the acoustic performance is a double cavity system. This provides isolation from both airborne and impact sound. Insulation in both cavities is used to provide thermal comfort and noise attenuation levels and allows certain services to penetrate the wall linings.

Key Features
  • GIB Intertenancy Barrier Systems achieve between 61–68 STC, well in excess of the New Zealand Building Code minimum for intertenancy walls (clause G6).
  • 60 minute FRR
  • Cost effective
  • Narrow footprint helps maximise the available tenancy area of each unit
  • Lightweight construction means no need for additional/specific foundation designs
  • Easy and fast to install
  • No need to fire seal most standard electrical or plumbing penetrations that pass through the wall  linings, these penetrations do not degrade acoustic performance
  • No specialised subtrades or equipment required for installation
  • No need to take the wall linings up to the roof space


Scope of Use

GIB Intertenancy Barrier Systems for Terrace Homes have been designed to provide an improved NZBC compliant separating wall between attached dwellings.

Statement of Building Code Compliance

GIB Intertenancy Barrier Systems for Terrace Homes, if designed, used, installed and maintained in accordance with the statements and conditions of the attached Appraisal, will meet the following provisions of the NZBC:

  • Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4. GIB Intertenancy Barrier Systems for Terrace Homes meet the requirements for loads arising from self-weight, imposed gravity loads arising from use, and impact [i.e. B1.3.3 (a), (b) and (j)]. See Paragraphs 8.1 - 8.5.
  • Clause B2 DURABILITY: Performance B2.3.1 (a) not less than 50 years, B2.3.1 (b) 15 years and B2.3.1 (c) 5 years. GIB Intertenancy Barrier Systems for Terrace Homes meet these requirements. See Paragraphs 9.1 - 9.3.
  • Clause C3 FIRE AFFECTING AREAS BEYOND THE FIRE SOURCE: Performance C3.4 (a) and C3.6. GIB Intertenancy Barrier Systems for Terrace Homes meet the requirements by providing passive fire and smoke protection. See Paragraphs 12.1 and 12.2.
  • Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. GIB Intertenancy Barrier Systems for Terrace Homes meet this requirement and will not present a health hazard to people.
  • Clause G6 AIRBORNE AND IMPACT SOUND: Performance G6.3.1. GIB Intertenancy Barrier Systems for Terrace Homes meet this requirement. See Paragraphs 15.1 and 15.2.
BRANZ Appraisal 940

940 [2016]

Installation and Operation

Winstone Wallboards are a manufacturer and marketer of gypsum plasterboard, drywall systems, and associated products and services.

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