I HAVE VINYL TILE ON MY BASEMENT FLOOR WHICH IS DOWN THERE SMOOTH AND TIGHT. I DO NOT WANT TO REMOVE IT. THE BASEMENT FLOOR HAS A DIP THE LENGHT OF ONE WALL. I WANT TO PUT CONCRETE OVER THE VINYL TILE TO BUILD IT UP TO MAKE IT EVEN WITH THE EXITING TILE SO I CAN LAY NEW VINYL TILE OVER THE ENTIRE FLOOR. iS THIS IMPOSSIBLE?