We bought a house four months ago and discovered that the plumbing vent pipe was not put back thru the roof after an addition was put on 3 years ago (inspector missed this!!)-- it vents into the attic. We want to remedy this ASAP, but are not sure if we should use a roofer or a plumber? We've gotten quotes from both-- who is the best person for this type of job? Any risks to the plumbing or roof while this work is being done that we should pay attention to??Thanks!!