I'm a DIY-er with a lot of experience in some phases of construction but not much in plumbing (so please be nice to my dumb questions!). I'm finishing a basement with a full bathroom, and thought I'd toss out a question here as I ponder whether to attempt myself or hire out.
My question is about venting. When they built the home 2 years ago, they roughed in for a bathroom in the basement. I'll put a picture below of the rough in. In the picture, numbered 1 to 3 from left to right, is a drain pipe for the lav (it is right up against the insulation), then the toilet, then the drain for the tub. But, I can't find any evidence of a vent. There's no rough in for a vent in the ceiling anywhere, and the lav drain is just capped off and doesn't extend upward to a vent (as I would have expected). The only stack in the vacinity is 3.5 feet to the right from the tub drain, but I know it is draining the 1st floor laundry (and possibly others as well). Any ideas on how to vent this without having to run a new vent to the roof (which would be near impossible)?
I think my local code allows AAV venting (as I'm pretty sure my kitchen sink has one, though the other bathrooms in the house do not). However, even if I did that for the lav, what about the toilet and tub? Is it at all possible that the stack draining the laundry could be used as a wet vent for any/all of the basement bathroom fixtures? (I'm thinking no, but thought I'd ask.)