From 1 May 2020, Class 2 to Class 9 buildings in Australian Capital Territory, New South Wales, South Australia, Tasmania, Victoria and Western Australia, and Class 3 to Class 9 buildings in Queensland must comply to Section J of NCC2019 Volume One. The calculation methodology used in this calculator does not comply to the Section J of NCC2019 Volume One, which requires thermal bridging to be included in the Total R-Value calculation. Please use Fletcher Insulation's free online thermal calculator FletcherSpec™ Pro for this.
Thermal Resistance Contributing Layers
Total Wall Thickness = 0mm
Total Thermal Resistance of Wall, R = 0.16 m2.K/W
Each layer of material is assumed to be perpendicular to the heat flow direction.
The calculation methodology complies with National Construction Code (NCC2019) Volume Two for Class 1 and 10 buildings and Section J of BCA2009. It does not take into account the effects of thermal bridging.
A wall that has external cladding such as weatherboards, fibre-cement or metal sheeting fixed to metal frame, must have a thermal break consisting of a material with R-value of not less than 0.2.
R-Value of Fletcher's Pink Insulation is valid for mean temperature of 23℃. For other mean temperatures, the R-Value needs to be adjusted.
When fibrous insulation like Pink Batt is compressed in the cavity, R-Value of the insulation is adjusted according to AS/NZS 4859.2:2018.
R-Values of insulation products other than Fletcher's Pink Insulation are widely accepted generic values, not independently verified by Siniat.
R-Values of outdoor and indoor air films are per AS/NZS 4859.2:2018.
Air gaps are assumed to be vertical, non-ventilated and the R-Values are per NatHERS material database available from CSIRO.
Air gaps with reflective surfaces must have the reflective surfaces facing towards the clear cavity.
R-Values of different materials are either per manufacturer's published data, NCC Volume Two Part 3.12 or NatHERS material database available from CSIRO.
The thermal resistance of an external wall has significant influence on the energy efficiency of a building. Total R-Value, as per 2019 NCC Volume Two, is the sum of the thermal resistances, R-values, of the individual component layers in a composite element including any building material, insulating material, airspace and associated surface resistances. This calculator can be used to estimate the Total R-Value of a wall of Class 1 and 10 buildings in any Australian state and territory and wall of Class 2 building in Queensland.
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