Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Hygrothermal modeling of green roof made with substrate and drainage layers of coarse recycled materials

Mostafa Kazemi, Luc Courard, Shady Attia
University of Li├Ęge, Belgium

Abstract: The thermal performance of an extensive green roof can be influenced by the initial hygrothermal conditions of substrate and drainage layers. Moreover, coarse recycled materials can affect the thermal resistance of green roof layers, while there is a demand for optimizing their thickness. Therefore, the main objective of this study is to optimize the thickness of green roof layers, once coarse recycled materials were used for substrate and drainage layers: WUFI software has been used for such application, which was suitable for modeling the initial hygrothermal conditions (heat and moisture properties) of green roof layers. According to the results, Rc-value for the green roof without coarse recycled materials was found slightly higher than that of the specimen with coarse recycled materials (4.1%), indicating nearly the same thermal resistance of the former and the latter. The green roof model with 15-cm substrate and 6-cm drainage layer can be regarded as the best appropriate system concerning their better thermal resistance and lower weight.
Keywords: Thermal behaviour, relative humidity, extensive green roof, drainage layer, substrate
Pages: 2381 - 2388