Building Code clause H1 Energy efficiency (4th Edition) came into force on 1 January 2017. This page contains useful information and tools to aid in applying the H1 requirements.
The 4th Edition of H1 provides for the use of NZS 4218:2009 (with modifications). NZS 4218:2009 provides an Acceptable Solution and Verification Method.
Visit the Standards NZ website for more information on NZS 4218:2009.
The BRANZ NZS 4218:2009 Calculation Method Tool has been updated to reflect the changes in the 4th Edition of H1.
BRANZ has prepared a guidance document to determine the R-value of a standard window for use in the 2009 version of NZS4218. When the values in Appendix D of NZS 4218:2009 are insufficient, this document leads you through the process to calculate alternative values using publically available software. This is known as the Standard Window R-value Calculation Procedure (SCP). The document also lists verified performance data for glazing and framing systems that can be used in NZS4218:2009. People who are approved by the window industry to perform this modelling for you are listed on the WANZ website.
To start, you need to have copies of the compliance document and relevant standard plus the BRANZ House Insulation Guide. The BRANZ information alone is not a complete reference.
ALF 3.2 (Annual Loss Factor) tool is a free online aid to the thermal design of houses. It is presented in a step-by-step format providing a simple method of calculating the energy performance of conventional New Zealand houses.
ALF3.2 is a verification method for determining the Building Performance Index (BPI), which can be used to show compliance with the Energy Efficiency Clause H1 of the New Zealand Building Code.
The Building Performance Index (BPI) and the Annual Loss Factor Tool ALF3.2 must be used.
The Fifth Edition of the House Insulation Guide retains the easy-to-read graphs and tables to determine the as-built construction R-values for given levels of insulation and common construction options.
This 5th edition includes new information and modelling for:
• windows and recessed light fittings
• steel-framed walls with different cladding types
• suspended concrete floors, concrete slab-on-ground floors, basement walls and waffle pods.
Other links and information
BRANZ publications on H1