AV WSM-50 Water Reservoir Panel

A structural, stable water reservoir panel made out of hydrophilic mineral wool that enables the Nophadrain Intensive Green Roof System to retain water naturally, similar to the manner in which clay or sub-soils retain water. The panels have a water retention capacity of approx. 40 l/m² at a build-up depth of only 50 mm. Owing to the limited amount of compressibility, the panels have been approved as a substrate substitute in accordance with the FLL*-Green Roof Guideline for the planning, execution and upkeep of green roof sites (2008). Through direct contact of the water reservoir panels with the substrate layer, the vegetation is able to regulate its own water balance, as nature intended. The growing medium itself will not become oversaturated because the retained water is restricted to the lower 40 mm of the 50 mm thick water reservoir panels and is only transported to the upper area by capillary action when needed. When the water reservoir panels become saturated, surplus water is discharged into the AV Drainage System. By using the AV WSM-50 Water Reservoir Panels, there is no build-up of hydrostatic pressure against the waterproofing membrane. Application The AV WSM-50 Water Reservoir Panel is component of the Nophadrain Intensive Green Roof System and the Nophadrain Water Buffering Roof System. Properties • Material: hydrophilic mineral wool • Density: approx. 120 kg/m³ • Water retention capacity: approx. 40 l/m² = 80 % volume • Air volume: approx. 16 % • pH value: approx. 7 - 8 • Weight: dry approx. 6 kg/m², saturated approx. 46 kg/m² • Test: Kiwa MPH Bautest GmbH - Test on the filter stability of the AV WSM-50 Water Reservoir Panel in combination with top soil (test on dry out).