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 H1 Energy Efficiency Support

Building Code clause H1 Energy efficiency (3rd edition) came into force on 31 October 2007. This page contains useful information and tools to aid in applying the H1 requirements.

NZS 4218:2004
Schedule method checklist
Calculation method formulas and worksheets

NZS 4218:2009
New standard NZS 4218:2009
NZS 4218:2009 Calculation Method Tool
NZS 4218:2009 Schedule Method Compliance Summary
Standard Window R-value Calculation Procedure for NZS4218:2009

Other relevant information
Compliance documents
ALF (BPI)
BRANZ H1 Energy efficiency webstream seminar
House Insulation Guide: Fifth Edition
Other links and information
BRANZ publications on H1

NZS 4218:2004

Schedule method checklist

BRANZ has prepared a ready-reference checklist with all the basic requirements of H1 and NZS 4218:2004 in one sheet. You can use this to help ensure that you have applied all the requirements of the schedule method. Refer to H1 and 4218:2004 for definitions, full details and the R-value requirements.

Note: This version supersedes the one that was given out at the H1 seminars. Following also are new versions of the calculation method formulas and worksheets.

Calculation method formulas and worksheets

The calculation method of NZS 4218:2004 has been modified by the new H1, and these changes are now in effect. Note that the checklists and calculation method formulas and worksheets are for NZS 4218:2004/H1 3rd edition only and cannot be used with NZS 4218:2009. 

These have been put into a series of printable worksheets to help with the calculation method. These worksheets have the correct Reference Building R-values for all zones, construction types, and dates.

NZS 4218:2009

New standard NZS 4218:2009  

NZS 4218:2009 has been published but has not been called up by H1, so is not currently an Acceptable Solution. BRANZ suggests that designers use NZS 4218:2009 as an Alternative Solution for Clause H1, as it has many improvements and is easier to understand and apply.

Visit the Standards NZ website for more information on NZS 4218:2009.

NZS 4218:2009 Calculation Method Tool

The BRANZ NZS 4218:2009 Calculation Method Tool was added to our website in November 2009.

NZS 4218:2009 Schedule Method Compliance Summary

The BRANZ NZS 4218:2009 Schedule Method Compliance Summary was added to our website in November 2009.

Standard Window R-value Calculation Procedure

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.

Other relevant information

Compliance documents

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. 

H1 changes

The H1 changes are now in force throughout New Zealand. These are the most significant changes from the previous H1 requirements.

Document 

 Measure

NZS 4218:2004

NZS 4218:2004 applies

NZS 4218:2004

30% total glazing limit

NZS 4218:2004

30% E,S,W glazing limit

H1: Third Edition

Calculation method changes

H1: Third Edition

Skylight limit

H1: Third Edition

Leadlight Limit

H1: Third Edition

New R-value Tables

H1: Third Edition

Double glazing

H1: Third Edition

New solid wall definition

H1: Third Edition

New BPI (ALF 3.2) - when released in February 2009.

ALF (BPI)

We are very pleased to announce that ALF 3.2 is now live and ready for use. You can find the link to the program under ALF 3.2 further down this page.

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.

BRANZ H1 Energy efficiency webstream seminar

House Insulation Guide: Fifth Edition

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

As yet, BRANZ has not identified any other web based tools or information that correctly applies the requirements of clause H1, or calculates component R-values according to the new requirements of H1.

BRANZ publications on H1