Hi all, My husband and I are installing a raised floor bathroom over a concrete floor in the unfinished portion of our basement. We bought our house with a bathroom of this nature and the previous owners of the house tore up the floor of the shower and there were other issues with the structure basically rendering the bathroom unusable. We completely removed the structure and are re-building it to add to the value of the house. Construction is something neither of us are familiar with so naturally we have questions. A few things about this space: the basement does not flood the drain works fine but the floor is slopped to help with drainage* see picture it is humid, but not terribly (the white machine is a dehumidifier) there is not good access to "finish" the floor under where the bathroom will be a portion of the foundation wall will not be finished I really want tile or vinyl to be laid. I have read about concrete staining and I really don't want that. The picture shows over a 3inch gap between the concrete and where the raise bathroom floor is...how do you close that barrier?