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Sets out minimum requirements for the materials, design and installation of waterproofing for domestic wet areas in Class 1, Class 2 and Class 4 buildings as defined in the NCC. It also applies to wet areas within Class 3 to 9 buildings as if it were a Class 2 or 4 part of a building.

This Certifier Practice Standard is prepared by the Commissioner for Fair Trading under section 14 of the Building and Development Certifiers Act 2018 (B&DC Act); Section 14 provides that a registered certifier’s conditions of registration may require the certifier to carry out certification work in accordance with specified standards or methodologies prepared by the Commissioner.

This Guide is intended to supplement to the "Criteria for the Passive House, EnerPHit and PHI Low Energy Building Standards" ("Criteria") published by the Passive House Institute and posted online; it explains the Criteria's requirements given here in a brief and precise manner.