
The same plumbing vents that were there prior to roof installation should have been there after the metal roof was installed.
I had a new metal roof installed last summer 2017 on a double wide mobile now I am having trouble with one of my toilets not flushing right I don't remember if there were any vent pipes on that side of the house . but could the installer have covered a vent pipe and now my toilet is not venting right . or how do you vent metal roofs? this roof was put over shingles . I will be calling a Plummer this spring