Do I need a sewer vent pipe for an additional new bathroom? FAQ

Here ya go :

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John T.

Curious and googled this:

I know I could find our county's codes on line but took a bit of trying.

Short answer, Yes. Venting can get pretty complicated but a general rule is if the fall of the drain pipe is more than the diameter of the pipe you need a vent. Basically you need a way to break the vacuum created when water flows through the drain pipe. They do make a studor vent, essentially a check valve that breaks the vacuum but some building departments hate them. I don't think you can use them on a toilet at all. The real answer comes from the building department but I bet they will want to see a vent typically on the stack from the sink.

If the new bath is on the top story or if it's single story, an additional vent is no big deal. If not, I think there are other alternatives, like a widget that acts as a one way air admittance valve. Whether you can use one of those for a whole bathroom though, IDK.

To: trader_4 Re: Re: Do I need a sewer vent pipe for an additional new bathroom? By: trader_4 to alt.home.repair on Tue Dec 15 2020 11:24 am

Yes

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Thank you. These are really helpful.