In time when one of the most important construction trends is sustainable construction as well as cost saving on heating and cooling of buildings, it is important to acknowledge the possibilities of application of construction materials with high heat insulation parameters and the ways in which these parameters can be obtained. Autoclaved aerated concrete (AAC) is a load bearing construction material, which has high heat insulation parameters, although it has one significant problem. If the autoclaved aerated masonry construction has high moisture content then it loses its heat insulation properties. This is the reason why it is important to detect the humidity distribution throughout the cross section of the masonry elements in order to conduct the drying process of the aerated concrete construction. Electrical impedance spectrometry (EIS) can be applied for monitoring of drying process of the masonry constructions and detecting of humidity distribution throughout the cross section of aerated concrete masonry constructions. Research of correlation between EIS measurements on autoclaved aerated concrete masonry blocks and absolute values of humidity content in the masonry blocks has been described in this paper.