NZS 4218:2004
Energy efficiency - Small building envelope
Provides details and guidance to meet adequate energy efficiency performance requirements for the building envelope of housing and small buildings. Incorporates glazing into the schedule and calculation methods of compliance with the required performance and focuses on excessive heat-loss through the area of glazing. It also brings the window R-values into line with Window Efficiency Rating Scheme (WERS) and adds an Appendix on glazing performance. It focuses on areas of glazing above 30% of the total wall area as these significantly affect thermal efficiency of the envelope.
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
© COPYRIGHT
CONTENTS
REFERENCED DOCUMENTS
LATEST REVISIONS
FOREWORD
REVIEW OF STANDARDS
1 GENERAL
1.1 Scope
1.2 Definitions
1.3 Purpose and context of use
2 GENERAL REQUIREMENTS
2.1 Groups of buildings
2.2 Integrity of thermal insulation
2.3 Conservatories, outbuildings and atria
3 COMPLIANCE METHODS
3.1 Schedule method
3.2 Calculation method
3.3 Modelling method
APPENDIX A MODELLING METHOD – BUILDING ENERGY USE COMPARISON
A1 MODELLING REQUIREMENTS
A2 THERMAL ENVELOPE
A3 LIGHTING
A4 INTERNAL LOADS
A5 CONDITIONING SYSTEM MODELLING
A6 REFERENCE BUILDING
A7 INFORMATION AND DOCUMENTATION
APPENDIX B CLIMATE ZONES
APPENDIX C HEAT LOSS EQUATION TABLES
APPENDIX D WORKED EXAMPLE
APPENDIX E BUILDING COMPONENT R-VALUE COMBINATIONS
APPENDIX F MEASUREMENT DETAILS
APPENDIX G GLAZING AND THE WINDOW EFFICIENCY RATING SCHEME (WERS)
APPENDIX H ORIENTATION
Tables
Table 1 – Non-solid construction – minimum R-values for schedule method (only where area of glazing is 30 % or less of total wall area)
Table 2 – Solid construction – alternative minimum R-values for schedule method (only where area of glazing is 30 % or less of total wall area)
Table 3 – Heated walls, ceilings or floors – minimum R-values for schedule method
Table 4 – Reference building – area of glazing R-values
Table A1 – Default power densities for internal gains from occupants and plug loads
Table A2 – Default schedules for occupancy and plug loads – percentage of maximum load or percentage of power density
Table C1 – Reference heat loss equations – non-solid construction
Table C2 – Reference heat loss equations – solid construction
Table E1 – Building component R-value combinations
Table G1 – Climate zones 1 and 2: WERS star rating
Table G2 – Climate zone 3: WERS star rating
Figures
Figure 1 – Decision flowchart
Figure B1 – Climate zones
Figure F1 – Floor and wall area measurements and R-value locations
Figure F2 – Roof area measurements
Figure F3 – Roof area measurements
Figure F4 – Total wall area
Figure F5 – Wall area
Figure F6 – Window measurement – single window
Figure F7 – Bow or bay window measurement
Figure F8 – Rooflight measurement
Figure F9 – Skylight measurement
Figure H1 – Orientation sectors
STANDARDS COUNCIL APPROVAL
- H1
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References
Energy efficiency - Large buildings
Insulation of lightweight-framed and solid-timber houses
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
© COPYRIGHT
CONTENTS
REFERENCED DOCUMENTS
LATEST REVISIONS
FOREWORD
REVIEW OF STANDARDS
1 GENERAL
1.1 Scope
1.2 Definitions
1.3 Purpose and context of use
2 GENERAL REQUIREMENTS
2.1 Groups of buildings
2.2 Integrity of thermal insulation
2.3 Conservatories, outbuildings and atria
3 COMPLIANCE METHODS
3.1 Schedule method
3.2 Calculation method
3.3 Modelling method
APPENDIX A MODELLING METHOD – BUILDING ENERGY USE COMPARISON
A1 MODELLING REQUIREMENTS
A2 THERMAL ENVELOPE
A3 LIGHTING
A4 INTERNAL LOADS
A5 CONDITIONING SYSTEM MODELLING
A6 REFERENCE BUILDING
A7 INFORMATION AND DOCUMENTATION
APPENDIX B CLIMATE ZONES
APPENDIX C HEAT LOSS EQUATION TABLES
APPENDIX D WORKED EXAMPLE
APPENDIX E BUILDING COMPONENT R-VALUE COMBINATIONS
APPENDIX F MEASUREMENT DETAILS
APPENDIX G GLAZING AND THE WINDOW EFFICIENCY RATING SCHEME (WERS)
APPENDIX H ORIENTATION
Tables
Table 1 – Non-solid construction – minimum R-values for schedule method (only where area of glazing is 30 % or less of total wall area)
Table 2 – Solid construction – alternative minimum R-values for schedule method (only where area of glazing is 30 % or less of total wall area)
Table 3 – Heated walls, ceilings or floors – minimum R-values for schedule method
Table 4 – Reference building – area of glazing R-values
Table A1 – Default power densities for internal gains from occupants and plug loads
Table A2 – Default schedules for occupancy and plug loads – percentage of maximum load or percentage of power density
Table C1 – Reference heat loss equations – non-solid construction
Table C2 – Reference heat loss equations – solid construction
Table E1 – Building component R-value combinations
Table G1 – Climate zones 1 and 2: WERS star rating
Table G2 – Climate zone 3: WERS star rating
Figures
Figure 1 – Decision flowchart
Figure B1 – Climate zones
Figure F1 – Floor and wall area measurements and R-value locations
Figure F2 – Roof area measurements
Figure F3 – Roof area measurements
Figure F4 – Total wall area
Figure F5 – Wall area
Figure F6 – Window measurement – single window
Figure F7 – Bow or bay window measurement
Figure F8 – Rooflight measurement
Figure F9 – Skylight measurement
Figure H1 – Orientation sectors
STANDARDS COUNCIL APPROVAL
- H1
Previous versions
NZS 4218:2004
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.