After trying to tear up water damaged bathroom subfloor, figured out that I have to take out the sink and toilet. However, before tackling this and being without, have some questions about what I will need to lay tile floor. I've laid tile in bath once on crawl space, replacing subfloor, installing wonderboard, elongating flange (yuck), installing tile, grout, etc. This time, we're on a basement floor and I want to make sure I have proper support; if not, need to know what to buy. I have 2 x 8 joists, if that's what you call them, cause when I got the ruler out, they measured 1 1/2"; is there such a width or was there or is 2" standard; house built in 1957. Anyway, on top of that is 1 1/4" x 12 diagonal wood floor. Or is this supposed to be 1 x 12? Is this enough support or do I need to reinforce? If so, how? Also, what size width subfloor is recommended? Have further investigation, but at this point, I'm thinking when one steps out of the shower, water flowed back toward tub and under linoleum and old, original 8 x 8 tile and rotted subfloor. Everyone says tile floor should be flat, but was thinking about putting in a floor drain, thinking about slightly raising tile around for waterflow? Any thoughts