J-Drain GRS (Green Roof Drainage System)

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J-Drain GRS is designed specifically for use with Green Roofs. It consists of a dimpled  Impermeable polymeric sheet attached to two filter layers. The top layer is a root-resistant filter fabric that is intended to prevent root growth into the drainage system and to retain soil. The bottom layer is specifically designed to protect the integrity of the waterproofing membrane. Unlike other J-Drain systems, the dimpled core of J-Drain GRS is inverted to all for water retention. All of these features make this system perfect for use with Green Roofs and other urban planter projects. All filter fabric is post-consumer recycled fabric!

GRS50 is a smaller, more cost-effective alternative to the standard GRS that is rated for less strength and less water retention. 


  • Easy to install
  • Pre-assembled drian system
  • 100% Recycled filter fabric
  • Root, mildew, & rot resistant
  • Reduces weight of Green Roof
  • removes need for gravel
  • Cost-effective
  • Filters fine particles 
  • Water Retention GRS 1.1 Gal/10 sq.Ft. GRS50 .042 Gal/sq.Ft. 



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