: 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.
: 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 green roof drainage layer buy
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. : A high-retention system specifically designed for green
When selecting a layer, consider which technology best fits your project’s hydrological needs: Overview for green roofs - Minnesota Stormwater Manual J-Drain GRS (Green Roof Drainage System) - GRS
The drainage layer is a critical component of a green roof system, responsible for facilitating water runoff, providing aeration to plant roots, and protecting the waterproofing membrane. A high-quality drainage layer prevents soil oversaturation, which can otherwise increase the structural load on the roof and compromise its integrity.
: A 3D mesh mat designed to enable quick drainage and breathability. The "3811R" model features geotextile fabric on both sides for maximum filtration. : ~$1,026 for a 39" x 100' roll at Eastgate Supply . Best For