This Thesis is devoted to the new generation of autoclaved aerated concrete exterior wall thermal properties, and as a result of the work the model of moisture migration and the heat flow process in an autoclaved aerated concrete exterior wall construction was calculated. In the given work under the concept of the new generation of autoclaved aerated concrete is understood monolayer structure walls 375 mm thick made of autoclaved aerated concrete blocks with the volume weight from 350 to 400 kg/m3, making the mortar joints up to 2 mm thick. The aim of the Thesis is to develop a calculation model for moisture migration and heat flow processes in the new generation of autoclaved aerated concrete external walls and carry out the proposed calculation model pilot test in the Baltic States climate zone, taking into account building technologies.