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Thermal bridging

  • Also known as cold bridging, thermal bridging is a kind of short circuit for heat transfer
  • Where high conductivity materials touch, heat will bypass insulation and travel the path of least resistance.
  • Calculations for facades must be in line with AS/NZS 4859.2.
  • The wall total R-value (Rt) will be highly dependent on the amount of thermal bridging within the facade.
  • A small amount of thermal bridging (which is normally ignored) will have a large negative effect on the Rt.
  • Thermal breaks will be required for facades with metal framing.
  • For more information on thermal bridging calculations and implications for your project please get in contact with the BCA Energy team.




Section J assessments must now have wall thermal bridging calculations to correctly determine the total wall R-value (Rt). Metal framed walls will require thermal