Summary:

In the cities, the temperature may be a few or even several degrees higher than the surrounding area. The result is called" urban heat island effect" which is due to heating of the surface of concrete, asphalt and steel. One of the solutions that can help reduce this phenomenon are green roofs. The aim of the study was the analysis of temperature changes of different roof surfaces (board, intensive roof substrate without plant cover, substrate covered with plants (shrubs - tawuły). The study was conducted on the roof of the building of the Faculty of Modern Languages, University of Warsaw. The measurement was performed using the FLIR SC620 thermal imaging system. The study showed that the smallest differences in average temperature between the surface covered with vegetation and a terrace amounted to 1,9oC (in the morning), while the largest reached 16 °C. The measurements made on the substrate without plants showed that the average radiation temperature is between the average temperatures from the terrace and shrubs. The results were discussed with the meteorological data (air temperature, wind speed).