As emergency overflows, alwitra water spouts are part of the alwitra roof and emergency drainage system for non-used or extensive green roof areas covered with EVALON® waterproofing membranes. They can be installed horizontally through the parapet.
alwitra water spouts are made of rigid PVC and, depending on the version, are equipped either with a welding flange for EVALON® waterproofing membranes or with a factory-fitted flashing collar made of EVALON®. Along with the alwitra water spouts for pipes with various diameters, rectangular versions are also available. These rectangular water spouts feature particularly high discharge rates at low ponding heights.