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You need a level surface so you would want the joints to be done & dry. HOWEVER

you really shouldn't put tile over drywall. Cement board, HardiBacker or green board, but never drywall.

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Q: Do you need to fill the seams on dry wall before you tile?
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Related questions

Do you have to tape off seams in durarock before installing tile?

nope just fill the crack with thinset


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If you want to fill a frame measuring 3' by 6' how many tiles would you need if each tile measures 3by 6?

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