Receiving the qualitative, energy efficient and economic building is the main tendency in the civil engineering. One of the leading places is occupied by technology of frame-panel construction with use of new non-autoclaved, monolithic foamed concrete technology producing on a building site. On the example of the real samples there were determined the heat-shielding properties of foamed concrete in a condition of setting process and after attainment of strength with a practical and theoretical methods. The results were obtained for a non-autoclaved monolithic foamed concrete wall fragment (lightweight steel concrete structure – LSCS) for the areas with and without rigid reinforcement with steel thin-wall profiles (lightweight gauge steel structure – LGSS). Influence of the thermal bypass on cold-resisting properties of enclosure structures with technology “Intech LB” is revealed. On the basis of the received results, modernization of a design for improvement of its thermotechnical characteristics is made.