Abstract.The results of theoretical studies of thermal modernization of cold roof floor. The designs of overlap of long-life roofs of public buildings were considered. Overlap of these buildings are made by wooden or concrete beams and made of concrete slabs with upward edges. The problems of thermal modernization of these designs are consideration of the impact of heat-conducting inclusions on the resistance to heat. The heat-conducting inclusions of constructions are beams and vertical edges of the slabs. The results of calculations of the temperature fields were used for the analysis. The research was carried for the two temperature zones which Ukraine's territory is divided into. The analysis of thermal protection level of structures overlap was made. The magnitude of the impact of heat-conducting inclusions on resistance to heat after thermal modernization of cold roof floor was observed. The analysis showed that the thermal protection properties of structures less than standard, therefore the insulation of areas with heat-conducting inclusions is required. The options of insulation of these areas were considered. The optimal insulation options with the least amount of additional insulation over the heat conductive areas were selected.One of the main tasks of external walling designing is to provide a normalized level of thermal and moisture conditions. However, when determining the thickness of the heatinsulation material of the walling the availability of the heat conductive inclusions with the thermal protection level smaller than in areas without it is ignored. In the roof floor buildings with long-life heat-conducting inclusions related to the vertical edges of concrete slabs, wooden beams and reinforced concrete. Ignoring of the properties of these areas leads to higher overall heat loss through external building walling. In addition to high heat in these areas there are such negative phenomena as lowering the temperature of the inner surface and increasing the amplitude of temperature variations on this surface. Increasing of the thermal-resisting properties is possible by additional insulation of heat conductive areas inclusions.There are works of various authors dedicated to the issue of increasing the thermalresisting properties of heat conductive areas inclusions of the external walling [1,2]. Such as [3,4] performed a series of tests of thermal external wall panels of residential and civil buildings. During the study the impact of "cold bridges" on the thermal quality of external

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This paper presents experimental and theoretical research for calculating of composite steel and concrete beams deflection strengthened bonded steel plates. The use of epoxy-bonded plates to strengthen existing or damaged reinforced or composite steel beams concrete beams has been extensively researched. It has been proven to be a useful and reliable method of increasing the ultimate flexural capacity of both damaged and undamaged members. The actual deflection behavior in beams is probabilistic in nature and requires statistical methods for a rational analysis.