I ripped out the tile flooring and part of the sub flooring in our bathroom, since the tile was all cracked and part of the sub floor was somewhat rotted. The order of flooring was: 1/2" plywood, 1/2" particle board, then tile. I ripped out all the particle board and tile, plus I cut a rotted 4' x 3' piece of the 1/2" plywood, leaving a 4' X 3' area exposed down to the flooring joist. I put a straight edge on the exposed joists and saw that they are not even with each other, nor level (they are somewhat close to level and even) . I plan to re-tile the flooring once I have replaced the 4' x 3' plywood section, plus another layer of 1/2" plywood over the entire floor area of the bathroom. I was going to apply Ditra membrane then tile the floor. My question: 1. Should I shim the sub floor so it is level and even? or 2. Should I just use floor leveler? If you suggest leveler, should I apply it just before the Ditra? or 3. Should I just adjust the uneveness of the floor but adjusting the amount of thinset I use on the tile?

I have a covered and enclosed porch (screens in summer; windows in winter- location eastern PA). I am planning to tile with porcelain using modified thinset on a 4" concrete slab. The floor was originally covered with in/out carpet. Do I have to TOTALLY remove the old rug adhesive, or is scraping it down best as possible acceptable? Or am I looking at have to apply an adhesive solvent?:confused: