![]() One of the largest sources of heat loss in buildings are the windows. f ≥ In dwellings with a moisture excess during the cold period + 4 g/m 3 and during the warm period + 1.5 g/m3 (commonly detached houses: low occupancy and normal ventilation), to avoid the mould growth the Rsi 0.65 f ≥ is needed and for surface c ondensation Rsi 0.55. ![]() For surf ace condensation, the limit value is Rsi 0.70. It was found that to avoid the mould growth on the thermal bridges in dwellings with a moisture excess of + 6 g/m3 during the cold period and + 2.5 g/m3 during the warm period (apartments with high occupancy or low ventilation) the spot temperature factor Rsi f should be greater than 0.80. Critical values of the temperature factor were calculated for different indoor humidity and temperature conditions. The aim was to avoid surface condensation and mould growth. For the indoor boundary conditions, the critical values from field measurements in detached houses were used. For this analysis, data about the outdoor climate were retrieved from six weather stations, covering a 31-year period, from 1970 to 2000. Climate analysis was conducted to determine the value for the temperature factor to be used for the design and infrared thermography inspections of Estonian dwellings to assess thermal bridges of the building envelope.
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