DRAIN FLOOR is a recycled polypropylene element, measuring 60x80x h 6 cm, designed for creating roof gardens. It is equipped with holes that guarantee good drainage and with reservoirs that act as water reserves. Since the first concern in the design of a roof garden is to ensure optimal vegetative growth, a correct evacuation of rainwater, together with a sufficient water supply, is required. DRAIN FLOOR is the only prefabricated element, made of recycled plastic, that fulfils both conditions. In fact, the 26 support bases per m² constitute as many reservoirs that provide a water reserve of 5 l/m² that can be further expanded. On the other hand, the 144 holes per m² are more than sufficient to guarantee excellent drainage even in the most extreme weather conditions.