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Knauf: the rebranded USG Boral plasterboard line

Knauf is the rebranded USG Boral plasterboard line: Wetstop, Sheetrock, Fireshield, Soundshield, AQUAPANEL. Specification, system warranty, and where it fits.

By Chalkline. Last updated 28 May 2026. Verified 28 May 2026.

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Knauf is the Australian plasterboard brand operating since 2022 as the rebrand of USG Boral, after Boral sold its 50 per cent of the USG Boral joint venture to the German-owned Knauf Group (verified 2026-05-28, Knauf USG Boral rebrand announcement). The legal entity is now Knauf Gypsum Pty Ltd, with the same Australian manufacturing footprint as USG Boral: factories in Sydney, Melbourne, and Brisbane, and a national distribution network of about 40 company-owned trade and retail outlets. For specifiers and builders, “Knauf” and the legacy “USG Boral” refer to the same product line: the data sheets, system numbers, and product codes carried across the rebrand. The NCC compliance pathway for plasterboard linings sits under NCC Volume Two H2 / Volume One Specification C1.10 (fire-hazard properties of internal linings).

What it is

Knauf is one of the two volume plasterboard suppliers in Australia, alongside CSR Gyprock. The product range covers the standard residential and light-commercial wall and ceiling lining categories:

  • Standard 10 mm and 13 mm sheet for general internal walls and ceilings.
  • Wetstop plasterboard for internal wet areas (water-resistant face, complies with AS/NZS 2588 wet-area provisions) (verified 2026-05-28).
  • Sheetrock branded plasterboard for residential walls and ceilings (a long-running USG line that carried across the rebrand).
  • Fireshield / Firestop fire-rated plasterboard for assemblies needing a Fire Resistance Level (FRL) under the NCC (verified 2026-05-28, Knauf APAC Firestop).
  • Soundshield for acoustic walls and ceilings between bedrooms, between attached units, and around plant rooms.
  • AQUAPANEL cement board (a separate product type, not gypsum) for high-exposure wet areas and external substrates.
  • MultiStop ONE multi-performance board (water + fire + impact + mould) for compact wet areas where multiple performance requirements coincide.

The plasterboard products are manufactured to AS/NZS 2588 (the Australian gypsum plasterboard standard). All Knauf interior plasterboard products are also classified as Group 1 under the NCC fire-hazard properties test (the lowest hazard category, the requirement for residential and most public-occupancy walls and ceilings) (verified 2026-05-28).

Knauf and CSR Gyprock: the two plasterboard volumes

Both Knauf and CSR Gyprock cover the same product categories: standard, wet area, fire-rated, acoustic, and impact. The practical differences for a builder:

  • Product names differ between the two. Knauf “Wetstop” is in the same category as Gyprock “Aquachek”; Knauf “Soundshield” is in the same category as Gyprock “Soundchek”; Knauf “Fireshield” / “Firestop” sits alongside Gyprock “Fyrchek”. A spec written in one brand’s nomenclature has to be re-mapped to the other before substitution.
  • System tables are brand-specific. Knauf publishes its own Fire Systems and Acoustic Systems technical manuals with NATA-tested wall and floor assemblies, used by certifiers as the proof-of-system for an FRL or Rw rating, in exactly the same way certifiers use the CSR Gyprock Red Book for Gyprock. A wall built half from one brand and half from the other is not a tested system and the certifier will reject the substitution.
  • Distribution. Both are nationally available. The on-site choice often comes down to the closest trade outlet and what the plasterer normally runs. Knauf’s 40 company-owned outlets are a known distribution strength for the brand.

Where the brand fits

  • Residential walls and ceilings: standard board, plus Wetstop in wet areas and Fireshield where the wall carries a fire requirement (e.g. garage-to-house wall for Class 1a, or boundary wall in a Class 2 building).
  • Acoustic separation: Soundshield in inter-tenancy walls and between bedrooms, often as part of a double-stud or staggered-stud system with insulation in the cavity.
  • Wet areas: Wetstop or MultiStop ONE as the board behind tiles or applied finishes, with the membrane and waterproofing detail to AS 3740.
  • High-exposure or external substrates: AQUAPANEL cement board where a gypsum-based product would not survive the moisture cycling, including shower bases, around pools, and as the substrate for tile cladding to exterior soffits.

The Fire Systems Guide and what it means for a certifier sign-off

Knauf’s Fire Systems and Acoustic Systems manuals catalogue the wall, floor, ceiling, and shaft assemblies the manufacturer has had tested to AS 1530.4 (fire resistance) and AS ISO 717.1 (acoustic) at a NATA laboratory. Each assembly carries a system number, a tested FRL or Rw rating, and an installation specification (stud spacing, board layers, fastener pattern, jointing detail). The system is the certified path: a certifier accepts the wall as compliant on the basis that it was built to a named system in the manual, not on a generic FRL claim.

The practical implication on site:

  • Pick the system before ordering the board. Wall thickness, stud type, board layers, and the specific Knauf board are all locked in by the chosen system. Substituting “the equivalent” without re-checking the system is how an FRL gets lost.
  • Keep the system reference in the documentation. The handover pack should record the Knauf system number used for any fire-rated or acoustic-rated wall. A future inspection or renovation needs that number to verify or maintain the rating.

For a builder

  • Map the spec before substituting. If the documentation specs a Gyprock product and your plasterer wants to run Knauf (or vice versa), look up the equivalent in the destination brand’s system table. A substitute that breaks the tested system is the certifier’s first reject.
  • Order from the system, not the SKU. When ordering for a fire- or acoustic-rated wall, give the merchant the system number alongside the board type. Mis-pulled product is a common slow-down.
  • Same trade, same compounds. Knauf provides its own jointing compound and accessory range. Mixing brands across compound + board in fire-rated assemblies has the same system-break risk as mixing boards.
  • Keep the brand consistent across a project. Tracking which wall is Knauf and which is Gyprock is the kind of admin overhead that snags handover. Pick one and run it through.

See also

Last updated: 2026-05-28. Verified: 2026-05-28. Quarterly review for currency.

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