System inverted and passable cover provided for installation on flat roofs ( 0 ° slope ) with slab Filtrón and rainwater tank . With Rhenofol CG resistance to the harmful effects of stagnant water and draining properties and resistance to the Filtrón floxotracción slab roofs wells can be projected ;. So there will be a rain water reservoir for supplying capillary plant , passive fire protection .
