Yes, Vents cannot join as you show. Must be 6" above the flood rim of the fixtures served before joining themBasement toilet and shower rough in in the planning. Is there a chance that the horizontal section of the vent could clog in this arrangement. Nothing is finalized yet.
Yeah I was afraid of that. Guess I will have to demo more of the concrete in the laundry area (which I wanted to not do) and move the double-wye (fitting #1) back.By my code, those vents should be coming off the top of the drain pipe, meaning 45* angle or greater. This means you have to hit the wall first with the drain, vent up, then travel to your trap & or trap arm.
If I were trying to get this plumbing done, i'd have asked for the concrete to be opened up on the other side of the wall as well so my tie ins could be over there, vent up in the wall, and then be more of a straight shot to where my drains are located.