Marley Building Materials

Data from major European manufacturers of AAC are used together with test results obtained on their materials in NAM AS accredited laboratories in UK to determine the parameters which influence thermal conductivity and to quantify them. Some history of measurement and correction methods for thermal conductivity is given along with a survey of current practices in various countries. It is shown that: AAC can be regarded as a generic material and representative thermal conductivity values can be given for the whole of Europe; the thermal conductivity can be taken as a linear function of the oven dry density of the material and as a linear function of the moisture content expressed as a percentage by mass; universal factors for the correction of thermal conductivity values to different moisture contents and densities can be derived; equilibrium moisture contents can be suggested for AAC in use based on laboratory and field test data.