Welcome, Francesca.
I'll move you to the Hangout where we discuss general installation questions rather than individual installations.
I think I'd need photos of particular types of tile you're having trouble with that wouldn't fit into the industry standard requirements for lippage, which I think is what you're asking about. Correct me if that's not the case.
Quote:
Originally Posted by Francesca
...especially on shower walls when their plumber installs the fixtures.
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Not sure what difference it makes who installed the plumbing fixtures. Perhaps you could expand upon that?