No Future Vent In Basement--Where do I vent Toilet, Sink and Shower

[Harry Harshaw]

Builder built this house in 99. Stub outs exist for all three W/C, Lavatory, and shower. Builder did not install future vent in basement ceiling piping that services any drains or existing vents. I have horizontal 3" PVC lines running to eventual 4" lines. I also have a washing machine drain above in the adjacent basement closet. I live in Cobb GA. Need to know if 1. I can run a wet vent into existing 3" horizontal drain line, OR install outside wall vent that does not goto roof OR do I just rub a 2" pipe up the wall into the washing machine room tie vent into the existing waching machine vent line?

 

[Reach4]

Stub outs exist for all three W/C, Lavatory, and shower.

Is the lavatory stub out in the basement? What does that look like, and if it is in the basement, what makes you think there is not a vent already?

 

[Sponsor]

 

[frederickvan]

Install an air admittance valve under the lav.