J-Drain GRS 4' x 50' per Square Foot

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J-Drain GRS 4' x 50'

A high strength pre-assembled drainage composite.It consists of a dimpled core with root resistant ECO fabric attached to the top layer and geosynthetic fabric attached bottom. The ECO fabric prevents fine particles from being washed out and prevents roots from becoming saturated and affecting the efficiency of the drain layer.The dimpled core has water retention chambers for storing water while allowing excess water to pass through “perforations”.

J-DRAIN GRS consists of a impermeable polymeric sheet cuspated under heat and pressure to form a high flow dimpled drainage core. The core is perforated, then bonded to top root resistant filter fabric and bottom protection fabric, specifically designed for Green roof applications. The top root resistant filter fabric prevents roots from affecting the efficiency of the drainage/aeration layer and retains soil or other fine particles from being washed away and allows water to pass into the drainage core. The bottom protection fabric safeguards the waterproofing membrane. The core is installed dimple side down to allow water retention. The excess water is collected and conveyed to a proper collection system..


  • Easy install / No loose fabrics
  • Pre-assembled drain system
  • 100% Post - consumer recycled filter fabric (ECO)
  • Root, mildew & rot resistant
  • Water retention chambers (1.1 gal/10 sq. Ft.)
  • Root, mildew & rot resistant
  • Reduces weight of greenroof (no gravel necessary)
  • Low Cost
  • Filters fine particles

Product Data Sheet


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