In the past, I had professionals who didn't do the plumbing immediately and it only caused catastrophe. After they hung, finished and painted all of the sheet rock in the house, they switched on the water just to discover that there were pipelines burst in the walls. Today, I CONSTANTLY make my professional check out the plumbing first, consisting of the sewage system lines. While the plumber is working, I'll have a HVAC team setting up a brand-new heating unit