I am getting a new roof installed, but beforehand I will be replacing the
cast iron sewer vent stack that is above the roof line with a new one. I am
guessing that just extending the new 3-inch PVC vent stack that will be
inside the house up through the roof to the outside to the correct height is
Is that correct?
Yes, that would work fine. Just use the appropriate flashing for the 3" PVC
I plumbed our house with PVC, but transitioned to a short segment of ABS
for coming out of the roof. This was just for appearance, as I felt the
black ABS pipe would look better sticking out of the roof than a bright
white PVC pipe.
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