Vent 1: This is the original vent that vented everything (incorrectly I am sure). Now it will basically vent the toilet. If I keep it it will be a 3" pvc pipe off the top of the waste stack. Maybe 6' of pipe before it goes through the roof.
Vent 2: This is a 2" pipe that starts in the basement for the washer and laundry sink. It then comes through the kitchen and picks up the kitchen sink, then continues on to pick up the vent for the tub/shower and lav. The 2" will go into the attic, then I will upsize to 3" to go out the roof.
OK, I got some pictures to help with my descriptions. I will start in the basement and move up.
The BLUE is my main stack, that corresponds to Vent 1 in my description above. Starts in the basement, goes up through the kitchen, to the bathroom and out the roof.
The green is my new vent that will go up into the kitchen. Vent for laundry sink and washer.
In the kitchen you can see Vent 1 just going straight up to the toilet.
Vent 2. Is coming up a different wall and picks up the sink in the kitchen.
Finally, we get to the second floor. I don't have the vent 1 pipe in yet, so I just colored where it would be. This currently goes through the roof.
The next two pictures detail vent 2. The first one is the vent off the lav, that goes into a closet. Then the second is the closet that picks up the lav vent and the vent from the kitchen. This will then go through the attic and get upsized to 3" in the attic, then go through the roof.
For reference, here is what the bathroom plumbing looks like, with the green and blue highlighting general vent locations:
So, originally the plan was to have two vents poking out of the roof. Then I started thinking maybe I just poke Vent 2 out of the roof, and connect vent 1 to vent 2 in the attic.
So, is it better to just have one come out of the roof, or should I stick with 2? I think I have like 15 DFUs. definitely less than 20 DFUs.
TIA...Mike