Newton 420 Reservoir is a unique drainage and water-retention membrane for use where a water reservoir is required for extensive green roofs of sedum, herbaceous plants, mosses or grass above decks and roofs.
Unlike other products of this type, Newton 420 Reservoir has a bonded geotextile that prevents intrusion of the soil into the water holding cups during back-fill and compression. This results in a permanently larger volume reservoir than any
other 20mm-deep green roof membrane.
When the water holding cups are full, the large drainage holes within the HDPE core allow water to easily pass through to the drainage layer below to prevent saturation and water logging of the green roof above.