I had a contractor build me a shower where I previously had a smaller shower stall. He laid cement board over the plywood subfloor and then tiled and grouted over that and said the floor was done - no liner, no cement bed, no nothing. There is obviously no slope and the drain is level with the tiles on one side and slightly above the tiles on the other. He's still working on the plumbing so I don't know how this is supposed to drain. Should I just fire this guy? Can anything be done to fix this or does it all have to come out? Please help!!