GREEN ROOF THERMAL PERFORMANCE

Abstract

With the development of architecture and technology, various forms of green roofs have evolved. Green roofs are not a completely modern technological idea because they existed centuries ago but in a different form than today. With the increase in the population in urban areas, both the climatic conditions and the quality of life have significantly changed. The need has emerged to change the shape and properties of traditional building construction materials, as well as roofs that must meet today's needs of modern people. Green roofs, as roof structures, are one of the green construction segments that represent a modern approach in finding sustainable solutions for large cities. They allow the unused surfaces of flat roofs to be put into the function of environmental protection, improvement of internal comfort and energy savings. This paper presents values of thermal fluxes and temperatures obtained in the summer period by measurements at a conventional (bare) roof and an extensive green roof up to 12 cm in thickness on a building in New Belgrade. Based on the conducted measurement of thermal fluxes and temperatures, the U-values for the conventional and green roofs were calculated and it is shown that the heat transfer coefficient can be significantly reduced by adding an extensive green roof to the existing conventional flat roof of the building. It is concluded that installing a green roof on an existing flat roof can be considered a very effective measure to improve the energy performance of old buildings due to the reduction in the heat transfer coefficient.