Keystones says a drop of 1 1/2" is normal in ceiling.

myredracer wrote:

riven1950 wrote:
your title says ceiling. your post says roof.

Which is it? Not that either one would be good but might make for different responses.

That makes more sense and is probably what's wrong. Easily fixable compared to a roof issue. Hopefully OP will come back and clarify.

The article states "roof", their exact words... "When they checked,they found a 1 1/2" sag in the roof surrounding the air conditioner".

To find a sag in the roof or ceiling is unacceptable either case.

Ron W.