I am doing a full bath addition to my house. The bath will have a toilet, sink and a tub/shower combo. Can this be vented with one 2" vent ? Where would the best place be to locate the vent ? Any thoughts on AAv's ?
Thanks for the help, Chuck

Milo Dolezal

Yes, it could be vented with 2" vent. You can connect to your existing house vents in your attic. AAV vents are not allowed in my area - but other plumbers in this forum inform me that they commonly, and legally, use them in their place of operation. If in doubt, always call your Inspector and ask him.

speedball1

Hey Chuck,
Yes, In my area one vent will service the entire group.
Most bathroom groups are roughed in like this.
Toilet connects to sewer main or the stack vent. Lavatory connects to toilet drain and runs a vent off the top the stubout tee out the roof or revents back into a dry vent in the attic..The toilet wet vents through the lavatory vent and the tub/shower connects to the lavatory drain and is wet vented by it. This is a normal rough in and is acceptable both by local and state codes and also The Standard Plumbing Code Book in 90 percent of the country. Check your local codes to make sure you're not in the excluded 10 percent.. The vent off the lavatory may be run out the roof or revented back into a dry vent in the attic or if you're reventing back into a fixtures dry vent you must make your connection at least 6 inches over that fixtures flood rim.
Good luck, Tom