AS NZS 4859.1:2018 pdf free.Thermal insulation materials for buildings Part 1: General criteria and technical provisions.
2.1 GENERAL
This Section provides performance criteria and technical provisions for materials to be used in the thermal insulation of buildings and building services.
In addition to this Section the insulating material shall—
(a) meet packaging and labelling requirements of Section 3;
(b) where applicable, meet product specific requirement of Sections 4 to 9, and normative Appendices B, C, D and E.
2.2 VALIDITY OF TEST RESULTS
Insulation products shall be retested if any change is made to material formulation or design that affects the performance.
2.3 THERMAL RESISTANCE
2.3.1 General
Thermal resistance of insulation material is designated as its declared R-value, which is determined as specified in Clause 2.3.3.
NOTES:
1 Some materials achieve a thermal resistance that is lower in the long term than at the time of installation. Common causes include the settlement of dust on IR reflective insulations, changes in cell gas composition in foam insulations and settlement of loose fill insulations.
2 Some compression-packaged materials take time to achieve their stabilized thickness and R-value.
3 For guidance on measurement of thermal resistance, see Appendix A.
4 The moisture content of materials will affect their thermal resistance.
5 For guidance on determination of design R-value, refer to AS/NZS 459.2.
2.3.2 Category
Materials shall be categorized as follows:
(a) Formed shapes Self-supporting shapes that have uniform or regularly repeating geometry on a scale small enough to permit determination of thermal resistance by physical measurement of heat flow through a representative area.
NOTES:
1 Formed shapes include panels, complete building elements such as walls or roofs, or other assemblies of different materials, which could include or combine bulk and IR reflective components internally but satisfy the requirement of small-scale uniformity. Formed shapes include bulk insulation materials with solid, cellular or other regular structure, (e.g. foamed or cellular plastics, insulating concretes, rammed earth, mud brick, wood- based products and rigid cellulose-based products such as cardboard. aerogels, cast resins and plasters). They also include fibrous materials not meeting the definition of ‘compressible’.
2 For guidance on thermal resistance measurement, see Appendix A.
(b) Formed in situ Materials such as paints and other coatings, sprayed fibres, and sprayed or injected foams.AS NZS 4859.1 pdf download.