HARPO EXTENSIVE AROMATIC SYSTEM FEATURES

• UNI 11235-2015 standard: The system adheres to the UNI 11235-2015 standard, surpassing minimum requirements for individual components and overall system performance as outlined in the 2015 edition.
• Versatile and lightweight: total thickness is about 18 cm, weight does not exceed 220 kg/sqm at maximum saturation for the BAS system. For the RIC system, with controlled water retention the total thickness is 20 cm, weight about 240 kg.
• Aesthetic value: perennial, evergreen, fragrant medicinal plants are used in these systems; those resistant to frost and drought, of limited height, should be chosen, allowing for effects and sensations typical of the Mediterranean environment.
• Usability: limited, the morphology of these plants lends itself poorly to free use, which therefore requires the mandatory construction of walkways.
• Management costs: maintenance is very low, with two to three interventions per year, mainly to remove weeds and replace some deadfall. Pruning is generally not necessary.
• Irrigation is only for emergencies, usually dripline, and the vegetation has excellent drought resistance and good regermination capacity.
• Implementation costs: this solution is particularly economical as far as the system is concerned. The total cost is a function of the choice of plants that are transplanted from pots. It turns out to be convenient in roofs of limited size.
• Thermal resistance: the system contributes to energy savings with a thermal resistance that varies depending on the water content but is not less than 0.54 (m2 * K)/W, with substrate thickness 15 cm, according to the CNR report for the BAS system.
• Runoff coefficient: 0.31, according to the University of Genoa report.