My PHCC instructor had no idea when I asked him during my code review class last year. And heck obviously I don't know the code with full clarity myself, I'm still unclear on what the UPC is telling me I can and can't do, so hopefully IAPMO can help on that end. So maybe I'm not giving my local inspectors enough credit but I'm nervous to do it in the field. ![]() When you look at the horizontal wet vent diagrams it kind of just looks like someone plumbed a shower/sink/toilet combo and forgot to vent the toilet and shower. My nightmare scenario is to rough-in a horizontal wet vent thinking I'm all slick with my awesome layout and then have to rip it out because the inspector thought different. My understanding is that the Cal buiding code uses the UPC, so anything the UPC approves is okay, unless you have a specific local county building code that overrules it. ![]() I'm not a contractor so my inside knowledge of a lot of this stuff is pretty limited. I am in Sonoma County, work often in Napa County and mostly deal with those two building departments. Just the perspective I've developed, some may have had different experiences. So in the second drawing, rotate the sink left, move toilet to center and work. I understand vaguely, both the sink and shower/bath tub must be vented prior to entering the main drain that the toilet is draining into. Both minors are vented prior to entering the toilet line. But I also can't stand the idea of getting failed because the inspector doesn't know the code as well as he should, and it seems like once they decide something, it's hard to make them change their mind, so if I start that debate I want every fact available to prove my point if I'm actually in the right. The second drawing, maybe closer to the wet vent arrangement. I'd like to have the maximum amount of information available first, because if you get in a disagreement with the inspector, you're only recourse is facts, you never win the debate arguing interpretation. On a side note I get nervous talking to inspectors about the code, because of having to worry about stepping on toes and offending them if you have to suggest that their interpretation isn't correct. A washer isnt part of the bathroom group allowed to be wet vented. Wyes on the horizontal and santees on the vertical. Trap arms on the horizontal, and those should be wye fittings not santees. I think I'll go that route first, hopefully they're willing to help. Drawings from a UPC plumbing inspector in Seattle. I use a IAPMO code book for the UPC, IAPMO has a number you can call with code questions and you can also request that they provide you with written clarification. I often get a guy that barely wants to give me the time of day on the jobsite, it's hard to imagine calling one up and peppering him with obscure code questions. ![]() While talking to the inspector is the obvious answer, it seems the most daunting.
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