Standard
Track updates
AS/NZS 4859.2:2018
[Current]Thermal insulation materials for buildings, Part 2: Design
Specifies the assumptions to be used in calculating the system and total R-values of building constructions, which include IR reflective or IR non-reflective airspaces, for the purposes of designing building components to be used in thermal insulation systems.
Published: 19/11/2018
Pages: 19
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope
2 Application
3 Normative references
4 Definitions
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
Appendix B
Bibliography
Cited references in this standard
ASTM C1371
Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers
ASTM E408
Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
NZS 4214
Methods of determining the total thermal resistance of parts of buildings
[Current]
Thermal insulation materials for buildings, Part 1: General criteria and technical provisions
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