The project's main objective is to develop a new type of ultra-thin green roof, which is an ultra-thin moss roof that, due to its low weight, allows application even on less load-bearing building structures. The new technology will allow the spread of green roofs and thus contribute to climate change adaptation. Another objective of the project is to design a tool for designing thin green roofs, which will also predict the runoff coefficient of the resulting roof composition in different climatic regions of Czech Republic and provide a more efficient design of thin green roofs. The sub-objective is to evaluate the change in roof runoff coefficient and the efficiency of electricity generation by photovoltaic panels in synergy with a thin green roof compared to a conventional roof.