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Gyprock Boundary Wall systems have been developed specifically to meet the needs of developers and builders of high density Class 1a buildings.

These systems evolve, if and when required, from a single boundary wall into a double boundary wall system that performs like an inter-tenancy wall, allowing for non-sequential development of attached dwellings.

Traditional construction methods require an entire 'block' of attached dwellings to be built as one, with the inter-tenancy walls lined as interior walls, after the roof and exterior walls are completed. With the Gyprock Boundary Wall system, individual units can be completed before the construction of adjoining units.


Gyprock Boundary Walls are intended for use in the staged construction of adjacent Class 1 buildings. These typically include, terrace houses, town houses and villa developments as well as single houses built on the boundary line with restricted access from an adjoining property. 

System Advantages

  • Meet BCA requirements for an external wall 
  • Space efficiency maximises internal space
  • Can be built without access from the adjoining property
  • Boundary walls can evolve into intertenancy walls with class leading BCA compliant acoustic performance
  • Allows stage financing and sales with individual titles 
  • Maximises land use
  • Range of lining options to meet performance requirements

System Performance

Gyprock Boundary Wall Systems provide the fire rating, thermal performance and weather resistance properties required by the BCA for external walls. With the addition of a second wall system, they also meet the acoustic requirements for an intertenancy wall.

Fire Resistance

The Gyprock Boundary Wall systems meet the 60/60/60 FRL fire performance required by the BCA. The fire protection is principally provided by the inclusion of Gyprock Fyrcheck™ MR between the frame and the exterior cladding. 

In areas where internal linings are interrupted or not present (for example, in the roof space or floor framing connection areas), additional fire protection is used in the wall cavity.

Acoustic Performance

Gyprock Boundary Wall Systems, in adjacent buildings, together achieve or exceed separating wall acoustic performance set out by the BCA.

While the BCA does not mandate acoustic performance requirements for external walls built on separate lots or titles, neighbouring inhabited dwellings often experience loss of occupant amenity due to the transmission of nuisance sounds across  reduced boundary setbacks. Some building authorities now recognise the inherent risk of amenity loss in zero-lot- line development styles, and mandate minimum external wall  acoustic performance above BCA requirements. Enhanced performance can be achieved by the selection of high-performance Gyprock linings and insulation.

System Design

Boundary Wall Overview
Single Timber Frame Wall Typical Layout
Single Timber Frame Wall Typical Layout
Double Timber Frame Wall Typical Layout
Double Timber Frame Wall Typical Layout

System Components

Gyprock Boundary Wall systems include a range of lining, insulation and accessory options to be determined by the designer in order to achieve different performance requirements. Only those product options specified should be used in order to guarantee the fire and acoustic performance of the system.

Lining Options


  • Gyprock plasterboard laminating screws
  • Drill-point wafer-head screw
  • Needle-point screw
  • Nails
  • Track fasteners

Other Accessories

  • Cemintel ExpressWall Backing Strip
  • Boundary Wall Z-Flashing
  • Cemintel Cladding Sheet H-Mould
  • Bond Breaker Tape
  • Sikaflex 11-FC
  • CSR Bradford Wrap/Sarking
  • System Fixings