[meford4u]

I am renoing my own basement bathroom right now and I have to disagree with Nef's guy about laying a leveling subfloor. The floor in a basement is set to slope toward a drain for a purpose. Flooding. I would not and will not put down a leveling compound on a cement floor in a basement. If you want to use the ditra/Kerdi system on you floor to help with shifting of the slab and possible cracking of the tile in the future, that I would recommend. In terms of what to do in the shower, your wasting time and money leveling the shower base. I don't know if your buying a kit to install or installing a tile based shower, but a Kerdi system is self explanitory and a worthwhile investment. You can buy the kits in different sizes and they come with a DVD to show you how to install the kit.