The paper presents analysis of hygrothermal characteristics of insulated external partitions in residential building in municapility of Michałowice. The study showed a high diversity of material and structural solutions in existing buildings. The value of heat transfer coefficient for external walls of buildings before thermomodernisation was surveyed as mostly about 1.00 W∙m-2∙K-1. Thermomodernisation contributed to reduction in heat transfer coefficient through the walls to about 0.30 W∙m-2∙K-1. Hygrothermal calculations showed a great risk of condensation in non-insulated exterior walls. Modernization contributed to elimination of condensation of water vapour in the carrier layer of the wall. The result of thermomodernisation was increase of temperature of inner surface of the partitions, which reduced the risk of water vapour condensation inside the baffles and on their surfaces. Another result of thermomodernisation was about 3-fold increase of thermal resistance in studied buildings in municipality of Michałowice. ...
