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.
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 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 The drainage layer is a critical component of