I believe your bag of thinset should have the specs for that. Mine said 1/8 for the 12 inch tiles I installed. Hardibacker suggested 1/8 under the backerboard (I used 1/16).
I think it may faster to put the morter on the floor instead of buttering. I believe it is less tiring also, but that may just be personal preference. Of all at the tile I have removed from my walls, it looks like they used 1/16 or smaller. My guess is that you should read your bag.
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Member Since
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