 Tiling Wall in bath - wall not flat. How to fix?
Hi, this is my first post on this forum. I am a "too cheap to pay someone else" DIY'er, and have successfully remodeled the bathrooms in 3 houses now, and have always ended up with great tile jobs. I'm now attempting to finish my master bath, in which we have a soaking tub. I gutted the entire bathroom several years ago, and have been slowly trying to get it done. I completely enclosed the tub area in backer board, then proceeded to finish the remaining room with drywall. However, as I was putting the last of the drywall up, I noticed that my existing studs were not very flat at all. I shimmed behind the drywall as best as I could. Unfortunatley, I didnt notice how bad it was when I was hanging the backer board. Long story short - after all the mudding/taping/sanding on the drywall to get it smooth and flat, I have this vertical lip of mud right where my tile is supposed to start (its on each side of the tub). Hope that make sense? Example - if I were to hold a piece of tile on the backer board, the face of the tile would be almost flush with the drywall....It ranges from .1" up to about 1/4" thick.
As I was working the mud and sanding, I was hoping it would end up thin enough that the standard application of thinset would put the tile out far enough so that it wouldn't look bad, but I think its too much. My tentative plan is to trowel on thinset as a filler to flatten out that transition (same as you would with drywall/mud). But I'd like to know if I'm putting my tile job at risk by doing this? Should I embed mesh tape in the thinset to help hold it together? Or should I find something with more glue in it? Worst case scenario - rip out all the backer board, and re-do it? Wife would kill me.......
BTW, the tile is 12x12 marble  | 
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