G4/VM1: Ventilation verification method

G4 VENTILATION VERIFICATION METHOD G4/VM1 Preface Preface Document status This document (G4/VM1) is a verification method issued under section 22 (1) of the Building Act 2004 and is effective on 25 July 2025. It does not apply to building consent applications submitted before 28 July 2025. The previous Verification Method G4/VM1 Fourth Edition can be used to show compliance until 31 July 2026 and can be used for building consent applications submitted before 1 August 2026. Building Code regulatory system Each verification method outlines the provisions of the Building Code that it relates to. Complying with an acceptable solution or verification method are ways of complying with that part of the Building Code. Other options for establishing compliance are listed in section 19 of the Building Act. Schematic of the Building Code system Build ing Legislation Act (mandatory) Building Code Objectives Functional requirements Performance criteria Compliance Alternative Verification Acceptable pathways Solutions Methods Solutions G4/VM1 SITS HERE and other means to comply Building Product Specifications Guidance issued under the Building Act Information A building design must take into account all parts of the Building Code. The Building Code is located in Schedule 1 of the Building Regulations 1992 and available online at www.legislation.govt.nz. The part of the Building Code that this verification method relates to is clause G4 Ventilation. Information on the scope of this document is provided in Part 1. General. A B C D E F G H BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 G14 G15 BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE BUILDING CODE Further information about the Building Code, including objectives, functional requirements, performance criteria, acceptable solutions, and verification methods, is available at www.building.govt.nz. MINISTRY OF BUSINESS, INNOVATION AND EMPLOYMENT 28 JULY 2025 Page 2