Thanks for the welcome cx,
I generally fur out my showers so the cbu can float over the liner. THe ply would achieve this. as well as allow the installer to not have to pre drill every hole in the cbu.
I relize putting up ply throughout the shower would be overkill, but I think it would just be easier to sheet the wall and install the backer. Obviously the liner should not be screwed threw, but i belive the ply could float the last 10" or so. and also you would be able to screw the cbu in the field as well as on 16's.
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