Double bathroom venting question

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Ron Bierman

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Hi,

I'm working on planning out a bathroom renovation and I'm having some questions around venting.

We would like to build the following floor plan:
Plumbing - floorplan.png

And I came up with the following plumbing solutions:
Solution 1:
Plumbing-2.png

Solution 2:
Plumbing-3.png

Solution 3:

Plumbing.png


My question is mainly around venting:
1. Are all solution above valid solutions that would pass code? (I would prefer sol 1 but should be able realize any of them)
2. Can I apply circuit venting like this or do I need to add additional venting for the bath, shower and/or WC
3. From what I understand you need to have a main stack vent that goes through the roof. And because of frost this needs to be a minimum of 3". Do I need to connect a 3" vent pipe to the 4" drain or can I use the 2" vent pipes and upsize it just before I go through the roof?

Thanks for any help and guidance,

Ron.
 
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