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GB Masonry Smooth Masonry Block

GB Smooth is part of the Austral Masonry range of masonry blocks, and are available in a range of sizes and configurations. Smooth is a finely textured finish created through the standard moulding process, it gives a soft glow to any project, and offers colours such as Porcelain, Pewter and Nickel.

They are intended to be used as either used as masonry wall systems for residential and commercial buildings, as well as use as internal feature and intertenancy walls. All Austral Masonry Blocks are manufactured to AS/NZS 4455.1

Key Features
  • Sound insulation — Due to their mass, concrete masonry blocks out noise better than traditional building materials, resulting in a quieter home environment
  • Low energy costs — Concrete masonry products are high thermal mass products which slow the transfer of temperature fluctuations from the outside into internal living areas. This reduces the need for use of heating and cooling devices and thereby reduces associated energy costs
  • Fire resistant — Concrete masonry products are made from non combustible materials so they are fire resistant
  • Durable — Exterior walls that will hold up to heavy storms, U.V. degradation, blistering heat, and sub-zero temperatures. With high impact resistance, they can endure significant impact from external forces
  • Range of colours and finishes — Concrete masonry products are available in a range of over 78 colour and finish combinations
  • Low cost — Concrete masonry is an affordable option. Quick to build, it keeps construction costs low, and can reduce or negate the need for accessory products such as sarking and insulation
  • Low environmental impact — Low in embodied energy, recyclable, and results in minimal waste
Recyclable Content (Post-Consumer)
Post-Consumer Recyclable Content
Scope of Use

Intended to be used as either used as masonry wall systems of residential and commercial buildings, as well as use as internal feature and intertenancy walls.

The Masonry is for buildings which are:

  • Within the scope of E2/AS3 (Amendment 9) (which is set out in section 1.1.1 of CCANZ CP 01:2014), and;
  • Within the scope of B1/AS1 (Amendment 18) which for concrete masonry buildings is set out in section 1.1.3 of NZS 4229:2013
Limitations on Use
  • The Masonry must be designed in accordance with the requirements of:
    • CCANZ CP 01:2014 (as modified by E2/AS3 (Amendment 18)
    • NZS 4229:2013 (as modified by B1/AS1 (Amendment 18)
  • Where used as a wall system where the Building Code obligations of G6 Airborne and impact sound apply, the wall system must meet the requirements of detail 1 of Figure 2 of G6/AS
  • For calculating the Fire Resistance Rating (FRR) for different Masonry systems to achieve compliance with C 3.6, refer to the Product Data Sheets for each product.
  • Mortar, materials (cement, sand and mixtures) shall comply with NZS 4210
Statement of Building Code Compliance

Austral Masonry Blocks will, if installed in accordance with manufacturer's instructions, will comply with or contribute to compliance with the following clauses of the New Zealand Building Code:

  • Structure: B1.3.1, B1.3.2, B 1.3.3 (a,b,d,f,h,j)
  • Durability: B2.3.1 (a)
  • Fire Affecting Areas Beyond the Fire Source: C3.5, C3.6, C3.7 (a)
  • External Moisture: E2.3.2
  • Hazardous Building Materials: F2.3.1
  • Airborne and Impact Sound: G6.3.1
  • Energy Efficiency: H1.3.1, H1.3.3 (a)
Other Performance Attributes
  • All Austral Masonry Blocks are manufactured to AS/NZS 4455.1


  • Inspect and wash exterior surfaces to remove dirt and mould at least once a year
  • For full information see the CMAA guide: CMO3 Concrete Masonry — Cleaning and Maintenance
Drawing Library
GB Masonry Fire & Sound Manual
Product Technical Statement: Austral Masonry Blocks
Data Sheets
Safety Data Sheet: GB Masonry
CMAA: Concrete Masonry — Cleaning and Maintenance
Mortex Mortar Application Guide
Brochure: GB Masonry Block Collection


Block Sizes and Formats: GB Smooth
Masonry Range Block Finishes
Additional Information

Austral Masonry is an Australian manufacturer of architectural concrete blocks and breeze blocks.

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