I prefer a stack all the way through the roof. In my area, most of our
plumbers have switched over to the new code and only make on
penetration through the roof with a 2".
Then they catch every single remaining fixture in the house with a
Personally, I don't like it. But I can see where the savings on time
and material make the all-studor vented (with one penetration)
significantly more efficient (from a monetary point-of-view only).
Frankly, I've wondered why the code insists on one penetration through
the roof. I would think a vent stack studor vented in the attic area
more than sufficient. I've not looked into the matter as to why code
requires the one penetration. Seems to me no penetrations would be