I am re-finishing my basement after fixing a drain tile issue. I am adding a bar area and would like to add tile around the bar area. When the interior drain tile was replaced the contractor did not level the concrete the best to match up with the existing slab. The high point starts at the wall and slopes slightly downward until it meets up with the original slab. So I am looking at about 12-14 inches of concrete with about 1/8", maybe 3/16" of slope. To correct the slope and have level tile can I simply use a thicker bed of thin set to compensate or will this affect the tile affect the tile in the future. Or do I have to grind down the concrete. The rest of the floor will be carpeted so I don't think the transition would be highly notable if I were able to use a thicker bed of thin set, just not sure if that is permissible.