Storm water runoff can be overwhelming during a heavy rainstorm when it is not effectively retained or circulated. A garden roof can significantly reduce the amount of storm water entering the municipal sewer system, which can result in additional LEED® points over and above what has been achieved for a garden roof alone.

DELTA®-FLORAXX is specifically designed to retain water in garden roof assemblies to reduce storm water runoff. The product features large, 20 mm high dimples with an octagonal shape for outstanding compressive strength. The breathable perforation and dimples allow water and air to circulate freely on the underside, so that water cannot collect on top of the insulation. A high water retention capacity and ability to effectively drain away surplus water make DELTA®-FLORAXX ideal for use in extensive or intensive rooftop gardens.