| Keywords |
Rooftop greenhouse; Greenroof; Inverted roof system; Moisture stability |
| Abstract |
Green spaces offer environmental, social, and economic benefits, but densely urbanized areas face challenges in securing ground-level greenery. In order to solve the problem, rooftop greenery construction methods, like green roofs and rooftop greenhouses, on buildings have been introduced, offering energy savings through a thermal insulation effect. However, these methods raise concerns about moisture problems in buildings due to the high humidity required for plant growth, risks of water leaks, condensation, mould growth, damages of roof structures, etc. This research examines the moisture stability of eight cases, combining two common concrete roof with green roofs and rooftop greenhouses. Main evaluations of the simulation results include the relative humidity of concrete, mould growth potentail in roof systems, moisture contents of insulation material, and the heat transfer coefficient of the structure. The purpose of this study is to find the optimal rooftop greenery configuration. The findings suggest that rooftop greenery built on inverted roof system shows the best moisture stability. However, in all cases where green roofs were applied to internal insulation systems, high relative humidity in the concrete results in a risk of rebar corrosion, and the mould risk increases significantly if the extruded polystyrene insulation is damaged. |