Runoff Capture

Foam roof panels capture 3 in. of storm water runoff, but weigh less than 15 lb per sq. ft fully saturated. They support a wide range of plants and are ideal for retrofits, 41- x 41-in. The panels can be installed planted (green) or even unplanted (cool white) over an existing roof. At the ground level, 170-gal biowales offer the most cost-effective solution.