I have a ceramic floor in my kitchen that does not run under the cabinets. We are renovativing our kitchen and, after ripping out the cabinets, noticed that the floor under the cabinets is about 1 1/2 - 2 inches lower than the tile floor. What is the best way to raise this floor? Can I just pour some concrete into this area so that it completely level with the ceramic floor? I need to put a range oven and a bunch of cabinets over it and would prefer to have a nice new clean and level floor, even if it is concrete under there.