I have new construction with 4" drain and 2×4 exterior walls. I am building a detached shop/living quarters with 2×4 walls and all plumbing is in one exterior wall.
- how would you run it? 🙂
- are cripples considered load bearing and does the 60% rule if doubled apply?
- can i go thru 3 cripples and then wrap around the king/jack studs? code says you can drill thru 2 on load bearing so question 2 is key. I could cut the window shorter and take bathtub vent straight up if needed I guess.
- if tying in vent lines on the horizontal how much angle required? just thought of this – can probably lookup myself.
I have no idea what im not asking. sorry. 
Best Answer
There is a reason why nearly all "plumbing walls" are located in the interior of the house, in a non-load-bearing wall. This is the reason.
You've got a bearing citrus tree, and you're talking about exterior 2x4 walls, so I'm going to assume that you're in the southern hemisphere in someplace with mild winters. That's relevant, because the applicable codes will likely be different.
Don't bother trying to tie all the vents together by going sideways in the the wall. Instead, tie the close ones together, and then try to get the rest together in the attic space. It looks like the tub and toilet vents could merge and go right in the photo. You might want to add another solid stud in the right-side gap right of the window, after installing the vertical vent.