I just rebuilt my basment when the contracter asked where the bathroom was going I showed him where the pipes where there was a pipe coming up already so I broke the concreate around it and he built the bathroom know when we use the water it drains realy slow and then things start to back up so we give it a hour or two and it all drains same thing with the toilet we flush once and then we got to give iit a hour or two mabe longerbefore we flush again as for the contractor no where to be found