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Plane element heat loss and thermal bridging together constitute all the conduction heat loss (measured in W/K, watts per kelvin) through the thermal envelope of a building. Perversely insulating the plane elements more and more without carefully dealing with junctions can lead to a significant increase in thermal bridging heat loss. This is often more significant in poorly thought-out energy-focused retrofits than in existing or new buildings.
Little, J. (2011) Thermal Bridging - Understanding its Critical Role in Energy Efficiency, Construct Ireland magazine, Issue 6, Vol 5, March 2011.