AS/NZS 4859.2:2018 Thermal insulation materials for buildings, Part 2: Design
Standards Australia/Standards New Zealand
The objective of this Standard is to provide 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 the following:
(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.
(d) Prescriptive reporting requirements for demonstrating total R-value and system
R-value calculations.
In this Standard, notes to the main text are for information and guidance only.
Statements expressed in mandatory terms in notes to tables are deemed to be requirements
of this Standard.
The terms ‘normative’ and ‘informative’ have been used in this Standard to define the
application of the appendix to which they apply. A ‘normative’ appendix is an integral part
of a Standard, whereas an ‘informative’ appendix is only for information and guidance.
Originated in Australia as part of AS2352—1980, AS 2461—1981, AS 2462—1981, AS 2463—1981, AS 2464.1—1981, AS 2464.2—1981, AS 2464.3—1983, AS 2464.4—1981, AS 2464.5—1985, AS 2464.6—1983, AS 2464.7—1990 and AS 3742—1990. Originated in New Zealand as part of NZS 1340:1959. Previous edition part of AS/NZS 4859.1:2002. Jointly revised in part and redesignated as AS/NZS 4859.2:2018.
This Standard specifies the assumptions to be used in calculating the system R-values 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.
Contents:
1: Scope
2: Application
3: Normative References
4: Definitions
5: Standard Assumptions
6: Calculation Of Thermal Resistance Of Airspaces With Parallel Bounding Surfaces Of Varying Emittance
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
11: Total R-Value And System R-Value Calculation Reporting Requirements
Appendix A: Spreadsheet Representation 19
Appendix B: Summary Of ISO 6946:2007 Reproduced And Modified Text
Thermal Insulation.
Aluminium Foil Insulation Association; Australian Building Codes Board; Australian Cellulose Insulation Manufacturers Association; Australian Institute of Refrigeration Air Conditioning and Heating; Australian Professional Thermography Association; AWTA Product Testing; Building Research Association of New Zealand; Consumers Federation of Australia; CSIRO; Engineers Australia; Housing Industry Association; Insulation Association of New Zealand; Insulation Australasia; Insulation Council of Australia and New Zealand; Master Builders Australia; Master Plumbers Australia; National Electrical and Communications Association; New Zealand Metal Roofing Manufacturers; Pliable Membranes Association of Australia and New Zealand; Roofing Association of New Zealand; Roofing Tile Association of Australia; Thermal Insulation Contractors Association of Australia, NSW.
