Several high-performance geocomposite drainage systems are available for purchase from specialized suppliers. J-Drain GRS (Green Roof Drainage System) - GRS Go to product viewer dialog for this item.
: ~$489 at BlueStone Supply or ~$422 at Best Materials .
: Includes two filter layers (root-resistant and membrane-protective) and is made from 100% recycled filter fabric. Enkadrain 3811R Green Roof Drainage Layer
: A more cost-effective and lighter alternative to the standard GRS, designed for projects with lower water retention requirements (~0.042 gal/sq. ft.). : ~$380 at BlueStone Supply . Types of Drainage Layers
: A high-retention system specifically designed for green roofs. It features an inverted dimpled core that retains approximately 1.1 gallons of water per 10 square feet.
When selecting a layer, consider which technology best fits your project’s hydrological needs: Overview for green roofs - Minnesota Stormwater Manual
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