AS/NZS 2589:2017: gypsum linings, application and finishing

TL;DR

AS/NZS 2589:2017 is the Australian and New Zealand standard governing how plasterboard is fixed, set, and finished on residential and commercial builds. Level 4 is the default paint-grade finish for residential interiors; Level 5 is required for critical-light situations (large windows, raking light, high-gloss paint). Framing must be within 4mm over a 1.8m straightedge before sheeting for Level 4 (verified 2026-05-08, Dulux Trade technical guidance). The most common and costly dispute at PCI: visible joints under raking light, usually traceable to a framing deviation, a missed back-block, or the wrong finish level specified (or not specified at all). Specify the level in writing before work starts.

In plain English

AS/NZS 2589:2017 sets minimum requirements for applying and finishing gypsum linings (plasterboard) in both residential and commercial construction across Australia and New Zealand. It covers substrate preparation, fixing methods and fastener spacing, jointing systems, finish levels, and the tolerances that determine whether installed work is defective.

The current edition was published in 2017. It superseded AS/NZS 2589:2007. Two amendments have since been incorporated: Amendment 1 (November 2018) clarified provisions for high-density gypsum plasterboard and updated fibre plaster references; Amendment 2 (April 2021) applied further updates. The current binding version is AS/NZS 2589:2017 incorporating Amendment Nos 1 and 2 (verified 2026-05-08, Standards Australia store).

The standard is paywalled. The NCC 2022 Volume Two and state Guides to Standards and Tolerances (QBCC, VBA) reference it as the benchmark for residential gypsum lining work. Both state guides confirm that plasterboard installation is defective if it does not conform to AS/NZS 2589 and the manufacturer’s installation instructions.

What it requires

Finish levels

The standard defines three finish levels for gypsum linings:

Level	Use case	Joint system
Level 3	Areas that don’t require decoration: above-ceiling spaces, inside service shafts, utility rooms not requiring paint	Joints taped, two compound coats on fastener heads only
Level 4	Default for residential construction: all walls and ceilings receiving normal paint decoration (flat, low-sheen, or matt finish)	Three-coat system: tape coat embedded, two coats over tape and fastener heads, sanded between coats
Level 5	Critical-light areas (large windows, skylights, directional lighting), high-gloss or dark-colour paint schemes, large unbroken wall planes	Three-coat system plus full skim coat over the entire surface; requires tighter framing tolerances

Level 4 is the default unless the contract or scope specifies otherwise. Not specifying a level is the number-one driver of plasterboard finish disputes at PCI.

The numerical joint width tolerances for Levels 4 and 5 come from the HIA Guide to Materials and Workmanship. Per current HIA Guide to Materials and Workmanship and the relevant state Guide, verified numerical values are pending HIA member access. [HIA-038]

Framing tolerances (substrate requirements)

The substrate must be straight and true before sheeting. Frames that exceed these tolerances are defective and the chippy must fix them before the plasterer sheets:

Finish level	Max deviation under 1.8m straightedge	Applies to
Level 4	4mm over 90% of the area; 5mm for the remaining 10%	Timber and steel stud walls and ceiling framing
Level 5	3mm over 90% of the area; 4mm for the remaining 10%	Timber and steel stud walls and ceiling framing

Source: Dulux Trade, referencing AS/NZS 2589:2017 framing deviation criteria (verified 2026-05-08, Dulux Trade technical guidance).

These tolerances are a direct division of responsibility: if the framing is out, the plasterer’s work cannot pass. Get the framing inspected and signed off before calling the plasterer.

Fixing methods

AS/NZS 2589:2017 allows three methods for fixing plasterboard to timber or steel framing:

Screw-fix only: screws to all framing members at specified centres
Nail-fix only: nails to all framing members at specified centres (largely superseded by screws on residential)
Combined adhesive and screw/nail: adhesive daubs plus perimeter fasteners. Where tiles will be applied, screws in the field at 200mm maximum centres; at corners, around openings and on butt joints, 150mm maximum centres.

Screws in the field of the board should sit just below the surface without breaking the paper face. Over-driven screws are a fixings defect.

Back-blocking

Back-blocking is required under AS/NZS 2589 for Level 4 ceilings in any area containing three or more recessed joints. Missing back-blocks on ceilings is a common cause of joint cracking and ridging. Per the QBCC Standards and Tolerances Guide (December 2023), within 12 months from completion a ceiling without required back-blocks is defective (verified 2026-05-08, QBCC Standards and Tolerances Guide).

What it doesn’t cover

Fire-rated assemblies: fire-rated plasterboard systems have separate test evidence and system documentation (FRL requirements sit in NCC Volume Two and Volume One). AS/NZS 2589 governs the application and finishing of the lining; the fire rating is determined by the system (board type, thickness, framing, fixings, joints) and its supporting test evidence or deemed-to-satisfy path.
Plasterboard product specification: the board itself is governed by AS/NZS 2588 (Gypsum plasterboard). AS/NZS 2589 governs installation and finishing only.
External applications: the standard covers internal gypsum linings. External cladding and eave linings are separate.
Wet area waterproofing: AS/NZS 2589 is silent on waterproofing; AS 3740 governs wet area waterproofing.

Practical implications

Specify the finish level in writing. Before any plastering subcontract is let, the contract or scope should state the required level (Level 4 is the default; Level 5 requires the call-out). “Finish-ready” without a level number sets up a dispute.

Inspect framing before sheeting. Use the 1.8m straightedge check before the plasterer commences. A 4mm deviation under the straightedge (90% threshold) is the Level 4 limit. If framing is out, the chippy fixes it. If the plasterer sheets over bad framing, the walls will fail the raking-light check and the responsibility argument gets messy.

Raking-light test at PCI. At PCI, hold a torch at a low angle along the wall. Under AS/NZS 2589, joints visible from a normal viewing position under raking light are a defect. Per the VBA Guide to Standards and Tolerances, walls deviating from vertical by more than 4mm within any 2m height are defective; surface waviness exceeding 4mm in any 2m length is defective (verified 2026-05-08, VBA Guide to Standards and Tolerances citing VBA Guide 2015).

Cracking. Cracks visible from a normal viewing position are a defect within the statutory defect liability period. Cracking at recessed and butt joints visible from a normal viewing position is defective. Hair-line cracks caused by normal settlement are assessed at normal viewing distance, not a torch-check.

Nail/screw popping. Within 24 months of completion, nail or screw pops visible from a normal viewing position are a defect (QBCC Dec 2023; VBA 2015).

Level 5 costs more and needs planning. Level 5 is not a skim-coat applied over a Level 4 finish. It requires planned coordination from design: tighter framing tolerances, correct adhesive positioning, full surface skim, appropriate primers before final coat. Specifying Level 5 after sheeting is already in is generally not achievable without stripping the boards.

State variations

NSW

NSW adopts AS/NZS 2589:2017 via NCC 2022 Volume Two. Building Commission NSW (formerly NSW Fair Trading) requires a contractor licence for any residential dry plastering or wet plastering work valued at more than $5,000 in labour and materials including GST, with separate licence classes for dry plastering work and wet plastering (verified 2026-05-09). From 1 September 2024, the Work Health and Safety Amendment (Crystalline Silica Substances) Regulation 2024 applies to all materials containing at least 1% crystalline silica, which includes some plasterboard joint compounds and fibre-cement adjacent products. Cutting and sanding operations triggering “high risk crystalline silica process” status need a silica risk control plan, on-tool extraction or wet suppression, and air monitoring (verified 2026-05-09).

VIC

Victoria adopts AS/NZS 2589:2017 via NCC 2022 Volume Two. Plastering work on domestic builds is regulated by the Victorian Building Authority (now operating as the Building and Plumbing Commission) under restricted Domestic Builder classes for sheet plastering and solid plastering and rendering, alongside the VBA Guide to Standards and Tolerances 2015 used to assess defects (verified 2026-05-09). Victoria sits outside the model WHS framework and operates under the Occupational Health and Safety Act 2004 and OHS Regulations 2017. WorkSafe Victoria treats plaster dust (calcium sulphate, 8-hour exposure standard 10mg/m3) under hazardous substances Part 4.1 and hazardous manual handling Part 3.1, and sheets over 6.5m2 or in awkward positions trigger team-of-two manual handling controls per WorkSafe Victoria’s plasterboard guidance (verified 2026-05-09).

QLD

Queensland adopts AS/NZS 2589:2017 via NCC 2022 Volume Two and reinforces it through the QBCC Standards and Tolerances Guide (December 2023). The QBCC issues a dedicated Plastering drywall licence covering construction of non-loadbearing partition wall and ceiling frames, fixing of plasterboard, plasterglass and fibre-cement sheets, joint finishing, fire-rated wall and ceiling installation, and suspended ceiling systems. The licence requires CPC31220 Certificate III in Wall and Ceiling Lining (or equivalent) plus the BSBESB402 managerial unit for contractor and nominee supervisor classes (verified 2026-05-09). A separate Plastering solid licence covers external render and traditional wet plaster.

WA

WA adopts AS/NZS 2589:2017 via NCC 2022 Volume Two. The Building Services Board (administered by the Department of Energy, Mines, Industry Regulation and Safety) regulates builder registration under the Building Services (Registration) Act 2011 for building work valued at $20,000 or more, but plastering is not a separately registered trade in WA, so a plasterer working as a subcontractor under a registered builder does not need an individual trade licence (verified 2026-05-09). Silica dust controls follow the WA Work Health and Safety (General) Regulations 2022 aligned with the model WHS framework. Defect assessment defaults to AS/NZS 2589:2017 and the manufacturer’s installation instructions, since WA does not publish a state-specific tolerances guide equivalent to QBCC’s or VBA’s.

SA

SA adopts AS/NZS 2589:2017 via NCC 2022 Volume Two. Consumer and Business Services (CBS) administers the Building Work Contractor’s licence under the Building Work Contractors Act 1995. Plasterers operating their own businesses need a Building Work Contractor’s licence with the relevant condition, plus a Building Work Supervisor’s registration to supervise the work (verified 2026-05-09). There is no SA-specific tolerances guide; defect assessment defaults to AS/NZS 2589:2017, manufacturer instructions, and the contract.

TAS

Tasmania adopts AS/NZS 2589:2017 via NCC 2022 Volume Two. Consumer, Building and Occupational Services (CBOS) licenses building service providers under the Occupational Licensing Act 2005 and Building Act 2016, with the Builder licence covering general construction. Plastering is not a separately licensed occupation in Tasmania, so plasterers work as subcontractors under a licensed Builder. Defect assessment defaults to AS/NZS 2589:2017 and the manufacturer’s installation instructions (verified 2026-05-09).

NT

NT adopts AS/NZS 2589:2017 via NCC 2022 Volume Two. The Building Practitioners Board registers Building Contractors (Residential and Commercial, Restricted and Unrestricted), Building Certifiers, Certifying Engineers, Plumbers, Drainers and Architects under Ministerial Determination No. S57 (gazetted 5 September 2025). Plastering is not a registered building practitioner class in the NT, so a plasterer works under a registered Building Contractor’s responsibility. Many NT plasterers hold voluntary Contractor Accreditation Limited (CAL) trade accreditation in lieu of a statutory trade licence (verified 2026-05-09).

ACT

ACT adopts AS/NZS 2589:2017 via NCC 2022 Volume Two. Access Canberra administers the Construction Occupations (Licensing) Act 2004, which regulates Builder, Building Surveyor, Building Assessor, Plumber/Drainer/Gasfitter and Electrician classes. Plastering is explicitly not a regulated construction occupation in the ACT, so plasterers operate as subcontractors to a licensed Builder (Class A, B, C or D) without a separate trade licence (verified 2026-05-09). Defect assessment defaults to AS/NZS 2589:2017 and the manufacturer’s installation instructions.

Source link

AS/NZS 2589:2017 on Standards Australia store (paywalled, verified 2026-05-08)
Gyprock, Levels of Finish summary (verified 2026-05-08)
Dulux Trade, Level of finish for plasterboard (verified 2026-05-08)

References

AS/NZS 2589:2017 (incorporating Amendment Nos 1 and 2), Gypsum linings, Application and finishing (Standards Australia, verified 2026-05-08)
QBCC Standards and Tolerances Guide, December 2023 (Queensland Building and Construction Commission, verified 2026-05-08)
VBA Guide to Standards and Tolerances 2015 (Victorian Building Authority, referenced via Vista Plastering, verified 2026-05-08)
Dulux Trade: Level of finish for plasterboard (verified 2026-05-08)
Gyprock, Levels of Finish (CSR Gyprock, verified 2026-05-08)
HB Plaster, Internal Plastering Standards (industry reference, verified 2026-05-08)