Hi,

I have a 4" cast iron soil stack running through a partition wall in my kitchen that's is going to be removed. That means the stack is in the way, so I plan to move it 3' into a closet. Above the kitchen ceiling is the bath, with a 3" toilet elbow running into a 3" wye(connecting the sink/bath drain) which then runs into a sanitary tee at the 4" stack, which then runs both down to the basement(through the kitchen) and up and out of the roof. My plan is to:

1) Support the stack with riser clamps(I don't know if they're there or not)

2) Cut the stack above the toilet elbow sanitary tee, and remove the tee, leaving about 4" of the upper stack exposed between the joists

3) Attach a nohub 45 degree elbow to the stack

4) Run a 3' length of 4" nohub pipe to the elbow, splice in a 3"/4" wye, and route it towards the closet.

5) Connect the 3" toilet elbow to the newly spliced wye, possibly using another 22.5 degree elbow(that depends on the intersection of the old cast iron and new nohub)

6) Attach an elbow to the new pipe above the closet

7) Insert a 9' nohub pipe vertically to the above elbow

8) Connect a long elbow at the floor back towards to original stack(which was cut at the top of the kitchen ceiling and in the basement)

9) Run a 3' length of nohub pipe back to the original cast stack

10. Attach an elbow to the stack
    
11. Support the structure with riser clamps

Now, does that make sense, and since the stack is still vented, am I in code compliance?