Hydroduct 660 Drainage Composite consists of a thick drainage core and high performance geotextile. Hydroduct 660 serves as a combination drainage and protection course for all Bituthene waterproofing membranes. The high strength, non woven geotextile is designed to protecting the drainage composite from jobsite damage prior to and during the installation of overburden while simultaneously collecting and transporting water.

Hydroduct 660 is a highly robust, preformed, geocomposite drainage sheet system, comprising a high impact, studded polystyrene core. This is covered on one side with a nonwoven, needle punched polypropylene filter fabric and on the other side with a smooth polymeric film. This film allows the Hydroduct 660 to be placed against waterproofing membrane and should not be removed.