I installed backerboard on the bathroom walls where I will be installing tile. Most of the seams are flush but at the horizontal seams the drywall is about a quarter to a half inch higher than the backer board. That is to say the drywall appears thicker than the backer board (I hope that makes sense). I imagine the tiled wall won't look right if the backerboard is not entirely flush with the drywall. How can I remedy this? I was thinking about removing the drywall between the backerboard and ceiling and just going with backerboard all the way up to the ceiling unless I can find an easier solution. Thanks.
I have found that 1/2 hardibacker is about 1/16"-1/8" thinner than 1/2" drywall. I usually float the seam out with thinset before I tile. If you're going to tile all the way to the ceiling, I would use backerboad for the entire wall.