where to put main vent

hohadcr

i am adding 1.5 bath and a kitchen to 1 st floor of a 3plex. there is no existing venting.

the 2 toilets are about 7' away from the 4" main stack. and other drains are kinda surrounding the toilets.

i dont know if i should:

1. put the main vent ringt on top of main stack-- then i need to run auxilary venting for every drain;

2, or, put the main vent right where the toilet drains are -- then i only need to run a couple of aux venting, though the main vent is not on top of main stack(does that matter?)

what would you suggest?

thanks

hohadcr

anyone can help pls?

plummen

its depends on the layout and framing of your rooms

hohadcr

right now, frame is up w/o drywall, so either way is possible.

There is no difference on the plumbing side?