Additional Info
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.
Project Information
Thermal Resistance Contributing Layers
Calculation Results

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.