In the thesis, there are included results of comprehensive research of application of electrical impedance spectrometry (EIS) for determination of moisture content in autoclaved aerated concrete (AAC) constructions. The research results display correlation between EIS and moisture content rate in AAC masonry constructions. As a result of the research correlation formulas between moisture content rate of the material and EIS measurement result have been established. A methodology for application of EIS for non-destructive detection of moisture distribution throughout a cross section of AAC masonry constructions has been developed and described in these thesis. The thesis consist of 112 pages, 107 figures, 4 tables, 114 references.