Green Roof Solutions offers several types of drainage options. The drainage layer of a green roof is one of the most important areas of performance. Extensive system green roof plants are very hardy perennial sedum, allium and other varieties. While they may be hardy in times of drought, they are also intolerant of excessive moisture situations. Detaining too much water in an Extensive Green Roof environment is just as harmful to the plants as too little water.
Root systems may retract from standing water, soil can become septic, breeding disease and fungus. These principles apply to Semi-Intensive and Intensive green and garden roof systems as well. Storm water detention is the objective with a green roof system. Too much will reduce vegetative cover over time.
Some moisture may be detained in the drainage layer as a resource in regions with infrequent rainfall, but the purpose of the drainage is to move any excess storm water laterally along the green roof system to the roof drains (internal drains or roof scuppers). The more water detained in the drainage layer, the deeper the growing media layer should be to allow the plants room to root without constant root contact with detained water.
Regional precipitation rates and recommended water detention are available through the National Pollutant Discharge Elimination System (NPDES) site.
GRS 32
Products offered by GRS to assist you with drainage:
- Aggredrain- Rotary Kiln Expanded Clay and Shale Aggregate
- Drainage Conduit- stainless channel for use with Aggredrain system
- GRS 1.5- HDPE 40″ x 48″ x1.3″ drainage panel
- GRS 235- HDPE 23″ x 23″ x 2″ drainage panel
- GRS 32- HDPE 2’ x 2’ x 1.25” drainage panel
- GRS 52- HDPE 2’ x 2’ x 2.25” drainage panel
- GRS AG50- 7/16″ thick high compression dimple panel sandwiched in filter fabric
- GRS AG50RS- 7/16″ thick High compression dimple panel with permeable root protection
- GRS Modular planter solution – Thickness from 2″ to 9″
- ExtenDuct–A post-industrial, recycled, polypropylene entanglement core (.45″ thick) that will conform to irregular surfaces, while maintaining continuous flow properties under pressure of media.
If you need any assistance, please contact us.