The Problems

When designing a garden roof system, a filter fabric is required to hold the growing medium in place. If this element is left out, the growing medium will clog the garden roof drainage, leading to a premature and expensive replacement. 

The Solution

DELTA®-BIOTOP is a filter fabric designed for use with perforated drainage and water retention boards, such as DELTA®-FLORAXX, in a Garden Roof System.

DELTA®-BIOTOP is the primary growing medium control layer to the system. It helps hold the growing medium in place, preventing clogging of the cups in the drain board, while allowing water to flow through it. In addition, DELTA®-BIOTOP keeps the growing medium in place, enhancing the water-retention capacity of DELTA®-FLORAXX.  

Product Details
Product Benefits
  • Composed of a non-woven polypropylene filter fabric 
  • Provides stability to growing media, allowing the proper garden roof drainage
  • Non-toxic and rot-proof in contact with growing media
  • Resistant to root penetration
  • Easy installation – simply lay on top of DELTA®-FLORAXX prior to placing the growing medium or ballast, overlapping each edge a minimum of 30 centimeters (1 foot)
  • Large widths minimize overlaps and improve application efficiency
  • If you use DELTA®-DRAIN, a fabric filter is not required because they have an integral fabric filter

Product Details

Technical Data