ZinCo Sponge City Roof

System Build-up “Sponge City Roof” – Temporary Retention, Large Water Reservoir and Increased Evaporation The HydroSpacer® HS 170 allows Zinco to come closer to its goal of bringing the water balance of a developed area closer to that of an undeveloped area. The basic idea is to have as much storage space as possible beneath the substrate and plant level. On the one hand this is to efficiently absorb heavy rainfall events and on the other hand to store water so that it is available to the plants.