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Pliable building membranes and underlays

An overview of Australian Standard AS 4200.2 which sets out requirements for the installation of pliable building membranes (also known as ‘sarking’ or ‘underlay’), when used either independently or as a facing to other materials.

Overview of the Standard

AS 4200.2 sets out requirements for the installation of pliable building membranes (also known as ‘sarking’ or ‘underlay’), when used either independently or as a facing to other materials, such as insulation materials, for either water control, thermal control, vapour control or air control purposes.

What does it include?

AS 4200.2 is broken into 4 sections consisting of:

  • Section 1: Deals with what the standard covers, and the terms used in the standard, details on which standards are referenced within this document, guidance on terms and definitions and electrical safety warnings.
  • Section 2: Deals with vapour control membranes, air control membranes (air barriers), water control membranes, thermal control membranes and allowable use based on duty classifications. 
  • Section 3: Details with framed floors, full masonry floors and common requirements for roofs including metal sheet roofing, tiled roofing, solid masonry roofing and ceilings. It also deals with common requirements for walls including framed walls, cavity masonry walls and solid masonry/concrete walls.
  • Section 4: Details with thermal control, vapour control, air control, water control, hot flues, recessed luminaries, windows, roof windows, skylights and doors.

The Standard also contains 3 informative appendices consisting of:

  • Appendix A provides safety guidance for pliable building membrane installation.
  • Appendix B details durability.
  • Appendix C outlines protection against condensation.

Is the Standard referenced in NCC or Other legislation?

Yes, AS 4200.2 is referenced in both NCC Volumes One and Two providing Deemed-to-Satisfy requirements for selection and installation of for the installation of pliable building membranes.

Who is the Standard for?

The primary users of this standard are building designers, carpenters, cladding installers, roofers, building certifiers and surveyors, builders, supervisors and inspectors.

Related Australian Standards

  • AS 1562.1 Design and installation of metal roof and wall cladding
  • AS 2050 Installation of roof tiles
  • AS 3959 Construction of buildings in bushfire prone areas
  • HB 39 Installation code for metal roof and wall cladding

Related HIA Information Sheets

  • HIA resource on AS 1562.1 Design and installation of metal roof and wall cladding, Part 1: Metal
  • HIA resource on AS 2050 Installation of roof tiles
  • HIA resource on AS 3959 Construction of buildings in bushfire prone areas
  • HIA resource on HB 39 Installation code for metal roof and wall cladding

Getting a copy of the Standard

An electronic copy of this Australian Standard can be purchased through the Digital Australian Standards webpage.

To find out more, contact HIA’s Building Services team.

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