GIARDINAGGIO 32 GIARDINAGGIO Tetti vegetalizzati I vantaggi che i tetti con copertura vegetale portano alla città sono di grande interesse in quanto riducono localmente gli effetti delle “isole di calore”, favoriscono un rinfrescamento dell’atmosfera, gestiscono l’acqua piovana. Inoltre, riducono il consumo energetico dell’edificio, sia per il suo riscaldamento, sia per il raffreddamento. La messa in essere di questa soluzione richiede, anzitutto, la realizzazione di una copertura impermeabilizzante del tetto, sulla quale si va a costruire un sistema di vegetazione costituito da: uno strato drenante, uno strato filtrante, un substrato, una copertura vegetale. Dalla struttura e dallo spessore del substrato dipende la tipologia del tetto, che può essere: estensivo, semi-intensivo, intensivo. Tetto estensivo Lo spessore del substrato è compreso tra i 4 e i 12 cm ed è costituito da un 10% di materia organica e da un 15% di terconditions and increased well-being should be considered. Vegetalized roofs The benefits that plant-covered roofs bring to the city are of great interest as they locally reduce the effects of "heat islands," promote atmospheric cooling and manage rainwater. They also reduce the building's energy consumption for heating and cooling. Implementing this solution requires, first of all, the construction of a waterproof roof covering, on which a vegetation system is to be built consisting of: a drainage layer, a filter layer, a substrate, and a vegetation cover. According to the substrate's structure and thickness, the roof type can be: extensive, semi-intensive, and intensive. Extensive roof Substrate thickness is between 4 and 12 cm and consists of 10 percent organic matter and 15 percent fine soil. For thickness below 8 cm, the choice of plant species goes toward xerophytic plants, such as the various sedum species, which are hardy, undemanding and have good particulate absorption capacity. Above 8 cm, the plant composition can be integrated with bluebells, fescues, irises, etc. The maximum load does not exceed 180 kg/m2. Semi-intensive roof Substrate thickness ranges from 12 cm to 30 cm, with 10 percent organic matter and 20 percent fine soil. For plant composition, turf grasses, some varieties of roses, and other similar essences are added to the species mentioned before. The maximum load is contained within 350 kg/m2. Intensive roofing Its thickness exceeds 30 cm, and the composition is that of garden planting substrates. As for vegetation, when the thickness of the substrate exceeds 1 meter, in addition to the
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