Australian Standards provide a framework for quality, safety, and consistency in construction work. For internal plastering, AS/NZS 2589:2017 is the primary reference standard. It outlines the requirements for plasterboard installation and finishing, including material specifications, joint treatment, surface finishing levels, and installation practices. Compliance with this standard ensures that plastering systems perform reliably under expected conditions.
AS/NZS 2589 Scope
AS/NZS 2589 covers installation and finishing practices for plasterboard and fibre cement board systems used on walls and ceilings.
Key Areas Covered
- Board fixing: Specifies fixing methods, spacing, and support requirements.
- Jointing systems: Defines procedures for taping, coating, and feathering joints.
- Finishing levels: Outlines surface finish levels from Level 0 to Level 5, each suited to different final treatments (e.g., paint, texture).
- Tolerances: Sets acceptable limits for surface deviations, fastener placement, and joint visibility.
This standard applies to both residential and commercial internal wall and ceiling systems.
Importance of Compliance
Following AS/NZS 2589 is not only a best practice but is often a contractual or regulatory requirement in building projects.
Quality Assurance
The standard provides a uniform benchmark for assessing the quality of plastering finishes. It ensures consistent workmanship, reducing the likelihood of defects such as cracking, joint deformation, or surface inconsistency.
Durability and Performance
Proper installation and finishing contribute to the long-term performance of plasterboard systems, particularly in areas exposed to humidity, thermal changes, or mechanical stress.
Inspection and Certification
Building surveyors, insurers, and certifiers may require compliance with AS/NZS 2589 when assessing project deliverables. Non-compliant work can delay approvals or lead to rectification costs.
Surface Finish Levels
AS/NZS 2589 defines five levels of surface finish, which influence the final appearance and suitability of the plasterboard surface.
Level 3
Used in areas where surface appearance is not critical, such as above ceilings or in utility spaces.
Level 4
The most common standard finish for residential interiors and commercial applications where flat or low-sheen paint is used.
Level 5
Required for areas receiving gloss or semi-gloss finishes, or strong directional lighting. Involves additional skim coating to minimise surface imperfections.
Professional Standards
Contractors are expected to understand and apply AS/NZS 2589 in all relevant plastering work. It is essential that:
- All trades adhere to recommended installation and finishing guidelines.
- Materials used meet minimum product specifications outlined in the standard.
- Work is regularly checked for compliance with surface tolerances and finishing quality.
Adhering to AS/NZS 2589 ensures internal plastering work meets defined industry standards for quality, durability, and visual performance. Contractors and project managers should treat this standard as a foundational reference for all internal plastering installations to achieve compliant and long-lasting outcomes.
