The results of thermal conductivity (Λ) measurements at several moisture contents on two types of aerated concrete in the density range 391 to 892 kg/m3, and four types of lightweight aggregate concrete in the density range 1144 to 1424 kg/m3, have been analysed to find a simple mathematical relationship between moisture content and Λ. The only measurements which have been taken into account were made since the British Standard was amended and since the British Calibration Accreditation scheme came into operation. It is shown that experimental results can be represented with reasonable accuracy by a linear relationship between Λ and moisture content by weight.
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