: Applications requiring continuous discharge under heavy compressive loads, such as rooftop gardens or permeable paver bases. J-Drain GRS50
When selecting a layer, consider which technology best fits your project’s hydrological needs: Overview for green roofs - Minnesota Stormwater Manual green roof drainage layer buy
: 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. green roof drainage layer buy
: ~$489 at BlueStone Supply or ~$422 at Best Materials . green roof drainage layer buy
: 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