The head contractor who got the bid for the entire job. Not the contractors working on these portions of the work. He should have the last say, or his architect or engineer anyway.
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The last fight was my fault. My wife asked "What's on the TV?" I said "Dust!"
If there is a conflict between ceiling and sprinkler drawings seperately then you need to have Coordination drawing then you can approach architect and fire system engineer to solve the problem.
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856