I'm planning my drain/vent system for a remodel of my house. Since I'm in Seattle, I'm using this resource https://www.kingcounty.gov/depts/he...ocuments/plumbing/horizontal-wet-venting.ashx which calls out the Seattle specific UPC amendments and has some helpful explanation/comments.
I'd love some feedback on my plan to confirm if I'm on the right track with my understanding the rules and with my planned design. The A/B options below are the same except for how drain lines of the two 2nd floor bathroom groups join - I'm not sure if this should be joined while still both horizontal (Option A) or if they should start dropping down and be joined when both are vertical (Option B).
I'd love some feedback on my plan to confirm if I'm on the right track with my understanding the rules and with my planned design. The A/B options below are the same except for how drain lines of the two 2nd floor bathroom groups join - I'm not sure if this should be joined while still both horizontal (Option A) or if they should start dropping down and be joined when both are vertical (Option B).