The same floor drainage
There are fundamentally two possibilities for installation of a same floor drainage. One requires the building of a prewall. All branch pipes to be connected with the stack are inside the prewall until they reach the main shaft. The advantage here is that there is no need to change anything about the existing floor structure. Furthermore if the prewall is designed as an integral part of the bathroom, there is no space loss, rather there can be space gains, as the prewall can be used for shelf space. As in the Geberit system the water tank of the toilet is moved into the prewall, significant space is gained. This installation can be applied to any residential building, as no change in slab construction is required and existing slab penetrations can be blocked.