This Standard 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 any one or more of the following control functions:(a) Water control.(b) Thermal control.(c) Vapour control.(d) Air control.This Standard does not cover requirements for materials used in the following applications:(i) Air-handling ducts and building services.(ii) Under concrete slabs on-ground.(iii) Waterproofing above flat concrete roofs.NOTES: 1 The installation of foil-faced building blanket is covered in AS 3999, except for metal sheet roofing and walls, which are covered in Section 3 of this Standard.2 Where regulations require special attention in bushfire prone areas, it may be necessary for a pliable building membrane to comply with AS 3959.3 This Standard includes advice on work health and safety (WHS), and electrical safety (see Appendix A); however, the user of this Standard needs to refer to relevant federal, state and territory regulations and determine legal requirements as applicable.

Originated in Australia as part of AS CA22—1965.Previous edition AS/NZS 4200.2:1994.Third edition revised and designated AS 4200.2:2017. Originated in Australia as part of AS CA22—1965. Previous edition AS/NZS 4200.2:1994. Third edition revised and designated AS 4200.2:2017. Reissued incorporating Amendment No. 1 (June 2018). Originated in Australia as part of AS CA22—1965. Previous edition AS/NZS 4200.2:1994. Third edition revised and designated AS 4200.2:2017. Reissued incorporating Amendment No 1 (June 2018). Reissued incorporating Amendment No 2 (June 2021).