Sorry if I hijacked this thread, but I too am thinking if using the same flooring the OP going to use. However since I have no basement I am converting and unused bedroom into a darkroom. Currently it has carpet which I plan to remove. I had planned to use a leveling compound over the sub floor which is wood and smooth the floor out somewhat and provide a better surface for the tile to adhere to. I am probably going about this the wrong way so any thoughts would be appreciated.

