In order to sustain living plants, the planted roof must have soil. Just like any other planted area, the soil must contain nutrients and have proper aeration and water. The construction materials selected for such a system therefore must be able to resist exposure to soil chemistry and fertilizers, physical abrasion from tilling, and contact with insects, animals, roots and soil, and to the constant presence of moisture. In addition, failure of the selected roofing materials may require excavation which would be a considerable undertaking for full roof plantings.
Most traditional roofing materials are not formulated for constant contact with soil chemistry, and are designed to shed moisture and spend at least part of their life cycle in a dry, well ventilated state. Membranes, insulation, drains, and containment supports should then be selected based on zero maintenance, below grade specifications such as those used beneath pavements, foundations, and patios as opposed to standard roofing criteria.
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