AS/NZS 4859.2:2018
Thermal insulation materials for buildings - Part 2: Design
Provides clear and concise requirements for determination and reporting of total R-values and system R-values to promote greater consistency of these calculations within the Australian and New Zealand marketplaces. This standard covers (a) Standard assumptions for the calculation of system and total thermal resistance of insulation products used in thermal calculations; (b) A prescriptive calculation methodology for determining the thermal resistance of airspaces with parallel bounding surfaces of varying emissivity; (c) A range of conversion coefficients for multiple insulation types; and (d) Prescriptive reporting requirements for demonstrating total R-value and system R-value calculations.
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AS/NZS 4859.2:2018 THERMAL INSULATION MATERIALS FOR BUILDINGS - DESIGN
PREFACE
CONTENTS
1 SCOPE
2 APPLICATION
3 NORMATIVE REFERENCES
4 DEFINITIONS
4.1 Material thermal resistance (Rm)
4.2 Slightly ventilated airspace
4.3 Total thermal resistance (Rt)
4.4 Unventilated airspace
4.5 Well ventilated airspace
5 STANDARD ASSUMPTIONS
5.1 Temperatures and temperature difference
5.2 Conversion coefficients for operating temperatures different to declared mean temperature
5.3 Emittance of IR reflective surfaces
5.3.1 General
5.3.2 Emittance value adjustments
6 CALCULATION OF THERMAL RESISTANCE OF AIRSPACES WITH PARALLEL BOUNDING SURFACES OF VARYING EMITTANCE
6.1 General
6.2 Unventilated airspaces with length and width both more than 10 times thickness
6.3 Ventilated airspaces with length and width both more than 10 times thickness
6.3.1 Slightly ventilated airspace
6.3.2 Well-ventilated airspace
7 AIRSPACES GREATER THAN 300 mm AND AIRSPACES THAT HAVE NON-PARALLEL BOUNDING SURFACES
8 AIR FILMS
9 THERMAL RESISTANCE OF FLOORS
10 TOTAL R-VALUE CALCULATION
10.1 General
10.2 Thermal bridging
10.3 Calculations
11 TOTAL R-VALUE AND SYSTEM R-VALUE CALCULATION REPORTING REQUIREMENTS
11.1 General
11.2 Table of layer contribution
11.3 Reporting of assumptions
APPENDIX A - SPREADSHEET REPRESENTATION
APPENDIX B - SUMMARY OF ISO 6946:2007 REPRODUCED AND MODIFIED TEXT
BIBLIOGRAPHY
Previous versions
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References
Pliable building membranes and underlays - Part 1: Materials
Thermal insulation materials for buildings - Part 1: General criteria and technical provisions
Methods of determining the total thermal resistance of parts of buildings
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AS/NZS 4859.2:2018 THERMAL INSULATION MATERIALS FOR BUILDINGS - DESIGN
PREFACE
CONTENTS
1 SCOPE
2 APPLICATION
3 NORMATIVE REFERENCES
4 DEFINITIONS
4.1 Material thermal resistance (Rm)
4.2 Slightly ventilated airspace
4.3 Total thermal resistance (Rt)
4.4 Unventilated airspace
4.5 Well ventilated airspace
5 STANDARD ASSUMPTIONS
5.1 Temperatures and temperature difference
5.2 Conversion coefficients for operating temperatures different to declared mean temperature
5.3 Emittance of IR reflective surfaces
5.3.1 General
5.3.2 Emittance value adjustments
6 CALCULATION OF THERMAL RESISTANCE OF AIRSPACES WITH PARALLEL BOUNDING SURFACES OF VARYING EMITTANCE
6.1 General
6.2 Unventilated airspaces with length and width both more than 10 times thickness
6.3 Ventilated airspaces with length and width both more than 10 times thickness
6.3.1 Slightly ventilated airspace
6.3.2 Well-ventilated airspace
7 AIRSPACES GREATER THAN 300 mm AND AIRSPACES THAT HAVE NON-PARALLEL BOUNDING SURFACES
8 AIR FILMS
9 THERMAL RESISTANCE OF FLOORS
10 TOTAL R-VALUE CALCULATION
10.1 General
10.2 Thermal bridging
10.3 Calculations
11 TOTAL R-VALUE AND SYSTEM R-VALUE CALCULATION REPORTING REQUIREMENTS
11.1 General
11.2 Table of layer contribution
11.3 Reporting of assumptions
APPENDIX A - SPREADSHEET REPRESENTATION
APPENDIX B - SUMMARY OF ISO 6946:2007 REPRODUCED AND MODIFIED TEXT
BIBLIOGRAPHY
Previous versions
AS/NZS 4859.2:2018
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.