• Acoustic Performance: Significantly reduced sound transmission between units and rooms.
• Good Impact Noise   Resistance: 75mm Hebel Intertenancy 001 has  discontinuous construction and can be selected to reduce the transfer of impact noise.
• Fire Protection: Tested systems have very good fire rating properties.
• Lightweight: Lighter loads on structures compared to masonry block, for equivalent Rw + Ctr rating.
•  Slender Walls: Wall thicknesses range from 275 to 325mm.
• Cost Effective: Cost savings compared to traditional masonry construction.
• No Wet Trades: Less mess and a cleaner, safer work area.

• Less Wastage: Greatly reduced waste, as panels are available in a range of standard lengths. This allows for best suited panel length selection,   which eliminates or reduces off-cut waste.

• Speed of Construction: Fast installation and assembly speeds with smaller construction crew requirements.
• Security: Steel reinforced AAC panels provide a high degree of security between units.
• Thermal Resistance: Excellent thermal resistance.

• Technical Support: Competent technical staff can assist with    systems  information. The following images show a typical two storey Hebel Party Wall installation.

Where it is proposed to construct single dwellings side-by-side on a single allotment the internal wall between dwellings is a fire separating wall as defined in the BCA. The fire separating wall must start from the ground level (top of concrete footings or top of floor slab) and achieve a 60/60/60 FRL if load bearing, or –/60/60 FRL if nonload bearing. The wall must go to the underside of a non-combustible roof covering and any gaps be filled with fireresisting material as described in Detail 3.7.1.11 of Volume Two of the BCA.

Dwellings Constructed Side-By-Side on Separate Allotments

Where it is proposed to construct single dwellings side-by-side on separate allotments, or if subsequent subdivision is proposed, the wall might also be considered an external wall and each dwelling may be required to have its own wall starting from the ground level (top of concrete footings or top of floor slab) and each achieving a 60/60/60 FRL if load bearing, or –/60/60 FRL if non-load bearing. Contact your local authorities, as there may also be applicable legislation or discretionary powers available to vary these provisions.

Dwellings Constructed SideBy-Side on a Single Allotment Where Subdivision May Subsequently Occur

Where it is proposed to construct single dwellings side by side on a single allotment and it is known that subsequent subdivision will occur, or that subdivision might occur (and this will probably apply to most multi-dwelling developments) then, after subdivision, the internal fire separation wall might also be considered an external wall and each dwelling may be required to have its own wall starting from the ground level (top of concrete footings or top of floor slab) and achieving a 60/60/60 FRL if load bearing, or –/60/60 FRL if non-load bearing. Contact your local authorities, as there may also be applicable legislation or discretionary powers available to vary these provisions.

Hebel PartyWall Solutions in tiered applications

Where the internal fire separation wall extends beyond the roof line on one side only and becomes an external wall, contact CSR Hebel Engineering Services for advice on PowerWall external wall solutions.

Compliance with the Building Code of Australia (BCA)

All building solutions, such as walls, floors, ceilings, etc. must comply with the regulations outlined in the Building Code of Australia (BCA) or other authority.

The BCA is a performance based document, and is available in two volumes which align with two groups of ’Class of Building’: Volume 1 – Class 2 to Class 9 Buildings; and Volume 2 – Class 1 & Class 10 Buildings – Housing Provisions. Each volume presents regulatory Performance Requirements for different Building Solutions for various classes of buildings and performance provisions.

These Performance Provisions include:

• Structure
• Fire Resistance
• Damp & Weatherproofing
• Sound Transmission & Insulation
• Energy Efficiency

This design guide presents tables and information necessary to design a Hebel PartyWall installation that complies with the Performance Requirements of the BCA. The designer must check the adequacy of the building solution for Performance Requirements outlined by the appropriate authority.

STEP 1: Scan the ‘System Selection’ table for the required characteristics.
STEP 2: Turn to Section 6.0 and select the appropriate Hebel PartyWall solution.
STEP 3: Confirm the selected Hebel PartyWall solution has adequate Fire Resistance Level (FRL) rating and acoustic performance level.
STEP 4: If an appropriate Hebel PartyWall can not be selected, contact CSR Hebel Engineering Services for advice.

 System Selection for Hebel Low Rise Party Wall

The core component of Hebel PartyWall systems is the 75mm thick, steel mesh reinforced Hebel PowerPanel. The panel is manufactured in a range of stock sizes with a nil edge profile, as detailed in Table 12.1.

Hebel Mortar

Hebel Mortar is used to provide a level base for panel installation as well as providing acoustic and fire protection at the base of the panels. Used in some 75mm Hebel Intertenancy 001 & 002  wall base arrangements. Supplied in 20kg bags.

Hebel Adhesive

Hebel Adhesive is used for bonding the panels together at vertical joints. Supplied in 20kg bags.

Hebel Patch
Minor chips or damage to panels are to be repaired using Hebel Patch. Supplied
in 10kg bags.

Anti-corrosion Coating Agent
Reinforcement exposed when panels are cut shall be coated with a liberal application of Fentak.

Deflection Head Track
For positioning and restraining the bottom and mid connection of the
panels.  Galvanised deflection head track Rondo Nº498 76 x 50 x 0.75mm BMT or Rondo Nº402 76 x 35 x 0.75mm BMT

Wall Brackets

The brackets are proprietary components which enable the Hebel PowerPanel to be fixed to the wall frame. This provides a cavity space, which can result in increased acoustic insulation  performance. The bracket is nominally 75 x 40 x 1.6mm x 50mm wide aluminium angle. Used in 75mm Hebel Intertenancy 001.

 Top Hat Section

The top hat detailed in this guide is the Lysaght Topspan 22. In 75mm Hebel Intertenancy 002, the top hats are used to fix the Hebel PowerPanel to the structural support framing. For alternative top hat types, the top hat manufacturer or project engineer will be responsible for approving the substitute product as adequate for performance requirements.

In 75mm Hebel Intertenancy 001, the top hats are used to provide easy alignment of the panels during installation. The top hats are installed temporarily between the framing and panels, and MUST BE removed after the aluminium brackets are installed.

CSR Bradford Insulation

75mm Hebel Intertenancy 001 and 002 systems incorporate CSR Bradford Insulation materials. Tables 12.2 and 12.3 present basic information on the glasswool and polyester insulation materials.

Hebel PartyWall systems that use Bradford Glasswool insulation generally have a better acoustic performance than systems using Polyester insulation. Additional information regarding Bradford insulation materials is available from CSR Bradford.

Fasteners & Fixings

Gyprock Plasterboard

75mm Hebel Intertenancy 001 and 002 incorporate Gyprock Plasterboard on both sides. The type, thickness and densities of plasterboard will be as per the specified wall requirements. Additional information is available from CSR Gyprock.

Fire & Acoustic Sealant
To attain the specified FRL and/or Rw requirements, all perimeter gaps and penetrations must be carefully and completely sealed with an appropriate flexible polyurethane (fire and acoustic rated) sealant installed to manufacturer’s specifications.

Backing Rod
Backing rod is used to enable correct filling of joints with sealant. It is recommended that backing rod be of open cell type to enable sealant to cure from behind. The diameter of backing rod must be appropriate for the width of the gap being filled.