Cosella Dorken.

Delta-Floraxx serves as a water retention and drainage layer for green roof systems. The sheets, installed on top of a green roof systems root barrier, feature octagon-shaped dimples that retain water during drought periods, while holes in between drain excess water to eliminate plant rotting. A Delta-Biotop fabric layer is installed on top to hold the growing medium in place and prevent clogging. 888.433.5824. www.cosella-dorken.com.