AS/NZS 4859.2:2018

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