Ok, so you can wet vent a shower with a sink and toilet in a totally different room, I didn't know that.Ok, an idea is below, maybe others will have a better idea. A few preliminary comments:
- UPC requires a 2" vent for a WC, and that includes a vent and drain for a lav that is wet venting a WC. Probably this came up already, but your green circles don't indicate the vent size.
- I was thinking that routing the building drain under the bottom bathroom WC is not as good as routing it to one side. But I'm perhaps mistaken, since the building drain is going to be a lot lower. That means you can just do your horizontal drainage and wet venting for the bathroom at a higher elevation, and then if the branch drain ends up directly above the building drain, just 45 down to an upright wye in the building drain.
- So I drew the idea below with the building drain to one side (and at an unspecified location), but you could do the same thing with the building drain under the lower (on the page) WC, if that works out better for where you emerge to connect to the building sewer.
- The basic layout is predicated on the idea of wet venting the shower via the half bath lav, rather than the full bath lav. The laundry sink and standpipe get dry vents, of course. I show the laundry sink/standpipe drain hitting the bathroom group but it could instead connect separately to the building drain.
View attachment 82099
No, I was talking about the WC/lav below the laundry room. And how to connect just those on a branch of the building drain, if it runs under the WC location. The laundry standpipe/sink and the WC/lav/shower would each be separate branches of the building drain.You're talking about the upper bath where we're now connecting the shower to? That one seems easy, lots of room. Its the toilet/lav below the laundry room that feels tight.
Ok that makes sense thanks. I guess either way you drew it will work which is nice to know. I'll just bring extra fittings. Side note, is it not allowed to do an upright combo in the main drain? Does it have to be a wye? It would make sense being a wye, I suppose less of a splat, which is why I ask.No, I was talking about the WC/lav below the laundry room. And how to connect just those on a branch of the building drain, if it runs under the WC location. The laundry standpipe/sink and the WC/lav/shower would each be separate branches of the building drain.
Below is a rough isometric of my textual description.
View attachment 82140
It wouldn't, I'm just talking in general. It would be a combo pick up the WC and keep going then reduce to 2" to pick up the lav.A combo is the combination of a wye and a 45. I expect a combo is fine wherever a wye is fine unless the extra 45 degrees of bend crosses some threshold. But if your setup is similar to that last sketch, how would a combo make things easier for you?
This is awkward, but...
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