celt,
haven't you realized yet that no matter how you do something, there is some piece of information out there that says don't do it that way?
i'm not even kidding. probably 60% of manufacturers installation instructions go against manufacturers instructions for other products used in the installation.
yet, every day we do installations that last 20 yrs or more.
I don't think there is a person on this board that has ever done a 100% code compliant installation if more than 3 parts were involved. That definitely includes me. There are too many codes and you can't help but violate some. Is it a dangerous installation? usually not. but, a sharp inspector, going by the book, can ding you.
it's getting too damn complicated