Seasonal and annual performance of green roof : Impact of thermal and hydraulic behaviour
Résumé
Performance of vegetated roofs are investigated in terms of their expected benefits for the building and the urban environment, due to their recognised thermal and water management potential scores. A review of related worldwide experiences is reported for comparison purposes. The investigation is here performed within the specific climatic context of the European region. Full-scale experimental results are provided from one case study, located in northeast of France, involving in two fully monitored green roofs plots on top of public buildings. The attenuation of solar radiation through the vegetation layer is evaluated as well as the thermal insulation performance of the green roof structure. The daily heat flow through the roof surface is quantified showing that the green roof outperforms the reference roof, therefore reducing the daily energy demand. As for water management, it is confirmed that green roofs significantly mitigate storm water runoff generation even in a Mediterranean climate in terms of runoff volume reduction, peak attenuation and increase of concentration time, although reduced performance could be observed during high precipitation periods.
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