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Can I use 1/4 cement board
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Yes, not a problem.
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would I stilll mesh and scratch coat then butter the stone?
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Please allow me to save you a lot of time, a few bucks, and a little needless effort. Forget the mesh, forget the scratch-coat, forget their mortar. Use modified thinset for setting ceramic tile. Back-butter the pieces and place them directly on the cement board and be done with it. This method is much easier than all that other nonsense. It would also be a good idea to use a wet sponge on the cement board just ahead of applying the stone pieces. This will help the thinset adhere to the cement board and will also eliminate any dust there may be.