Dow Chemical Co.’s Verdiseal Waterproofing System protects green roofs from bulk water and root penetration. The spray-applied polyurethane creates a monolithic barrier across a roof deck, side walls, and any sloping surfaces in between. It offers quick cure time, protection against invasive root species such as bamboo, design flexibility, and it eliminates the need for the root-resistant protective layer required for conventional membrane green roof systems. A three-part system including primer, elastomeric membrane, and robust wear coat, Verdiseal accommodates complex roof designs and can be spray-applied onto a range of prepared substrates without the use of bitumen, open flames, or solvents. dow.com