1. Is it 1/2" backer board? I think its 1/2" nominal and actually closer to 0.45".
2. Have you screwed everything at 8"oc? (or whatever the manf rec is)
3. Are your studs at 16" oc?
If those three things are true, then youve got nothing to worry about.
Be sure you tape and mud your seams. Feather that shit out so you dont have a collywobbled row of tiles. Dont rush the waterproofing process either.
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