We are redoing the entire house. I was going to do it myself but my dealer made me an install deal I couldn't refuse. We are doing most of the house in Adura vinyl plank, and the kitchen and bath in a similar material, ceramic look vinyl tile. I'm doing the tear out work to save some money, the carpet is no big deal, but I asked about the vinyl sheet in the kitchen and bath and was told to leave it alone if it is in good shape. But I have read that the fake grout lines in the sheet we are covering "could" show through the new flooring if they are "deep". Well I don't want anything like that to happen. I was told if it is "too deep" I could skim coat it with self leveling to fill the low spots. My worry is that the installer may chose to not skim it, or not remove it, and the lines will show through. How deep is "too deep"? All are Concrete floors. What is the excepted method?