Bath Drain/Vent Review

[wysedav]

If you have a second please comment on the isometric I drew for my basement bathroom layout. I just want to get a comfort level before I begin gluing this up. I have two additional questions maybe someone can help me with:
1. When I transition from the drain to the vent on the shower can I use a 2" "y" with the branch going to the shower?
2. Where the 2" drain line from the shower ties into the 3" toilet drain do I have to come in above the centerline of the pipe or is it OK for everything to be in the same horizontal plane?

Thanks,

David

[dlarrivee]

Flat vent for the shower?

[wysedav]

Yup, the vent for the shower would be on the same plane as the drain.

[dlarrivee]

That is a problem.

[cacher_chick]

The vent must be downstream of the trap and cannot be horizontal until it has risen at least 6" above the flood rim of the lavatory.