Plumbing - DWV - Layout Diagram
First, thanks in advance to all that read this post and provide any input.
Well, renovation of plumbing is in progress and I wanted to ask for some advise from those that are much more experienced.
I've attached a diagram for a new plumbing layout of the DWV system. Currently it is all Cast Iron (CI) or galvanized pipe, but will be 90% replaced with ABS PVC.
House is in WA state, so UPC is the code guidelines.
Of course, code is a concern, but since all of these changes are primarily direct-replacement of existing piping, my belief is that new code compliance not a requirement, just a recommendation. However, I would like to hear anything not in compliance and any suggestions for improvements.
I've had no major problems, except for 1 leak, but I think it's time the exiting piping is replaced, and possibly tightened up (better hidden between floor joists and along/inside walls). Furthermore, the kitchen drain was not done incorrectly (piped into cleanout) and needs to be corrected (shown corrected in diagram).
So, first - any issues/concerns with the diagram?
Next, here's a few questions:
a) Can 1 & 2 be combined into a "1/4 Bend". I believe this would be shorted in depth (and fewer connections)?
b) Repeated questions from (a) for bends 7 & 8 ? 15 & 16 ?
c) Can the top air vents be combined within the attic space, creating only a single roof penetration ? What would be the minimum/max/recommended size of the combined pipe penetration?
d) How much would the size from question c change with the addition of a single attic AAV ?
e) Any critical distances that I need to be aware of?
f) Could 10 be swapped for a Double Sanitary Tee (removing 9 & 14) in order to shorten vertical distances ?
Again, Thanks for your time.