Can green roofs grow on a slope?
Green roofs can be grown on any pitch of roof, including vertical walls, however, roofs of greater than 9.5° generally have specific design requirements in order to retain the water and substrate across the roof surface. On roofs of up to 45° this can be achieved with the installation of a series of cross batons or grids which must be more closely spaced as the roof gets steeper Minimum falls of 1:60 are recommended to allow free draining. On extremely steep roofs, irrigation may be required.
