New bathroom in basement, how to vent?

[Philip6218]

Good Morning everyone,

I've been reading up on venting for a while, found some useful info on basement bathrooms. The combination of venting the bathroom as well as the sewage pump has me unsure. I have added some pictures of the plumbing that is in place. Pictures are from a couple years ago, this is all under slab currently.

From left to right I have a shower, a toilet, and a lav. Then down the wall I have another lav for a wet bar. All of the drains lead into the ejector pit. Directly above the ejector pit there is a capped drain line and vent line. The drain line is tied into the house main sewer line, and the vent goes up through the house and out. The vent does have a wye that allows for two tie-ins.

The pit is pretty straight forward I think, it will vent through the dedicated vent line directly above it. Can all of the drains be vented off of one lav, which would tie into one of the vent connections above the pit?

Any help or advice would be appreciated!

Thanks,
Philip

 

[wwhitney]

Your lav, bar sink, and ejector basin will all need dry vents. It looks like the under slab plumbing is correct for the lav to wet vent the shower and WC. [The combined shower/lav drain should join the WC drain before the bar sink comes in, but if that's not the case, I'd say that's a fairly minor issue.]

So best practice would be run a vent for the bar sink up to the ceiling and over to your vent stub, and join all 3 vents to your vent stub.

Cheers, Wayne

 

[Sponsor]

 

[Philip6218]

Your lav, bar sink, and ejector basin will all need dry vents. It looks like the under slab plumbing is correct for the lav to wet vent the shower and WC. [The combined shower/lav drain should join the WC drain before the bar sink comes in, but if that's not the case, I'd say that's a fairly minor issue.]

So best practice would be run a vent for the bar sink up to the ceiling and over to your vent stub, and join all 3 vents to your vent stub.

Cheers, Wayne

Thanks Wayne, I appreciate the input!

So if the underground stuff is correct for wet venting, does this seem correct for the above ground layout?

 

[Reach4]

Thanks Wayne, I appreciate the input!View attachment 80329

So if the underground stuff is correct for wet venting, does this seem correct for the above ground layout?

Ideal. Vent to roof is necessary for the pit. That may need to be 2 inch, but I am not sure. AAVs could work for sink and lav_shower under IPC, but since a real vent is available, that is superior.

 

[wwhitney]

So if the underground stuff is correct for wet venting, does this seem correct for the above ground layout?

Yes on the venting and the lav drains.

It is possible that the horizontal vents should be kept above the horizontal drain into which the sewage ejector pumps. I'm not sure if that's really an issue or not, not super familiar with ejector pumps. It's a question of what happens in various failure modes and where things overflow first, you don't want them spilling into the horizontal vents. But I think I may be mistaken that it matters.

Cheers, Wayne

 

[Philip6218]

Ideal. Vent to roof is necessary for the pit. That may need to be 2 inch, but I am not sure. AAVs could work for sink and lav_shower under IPC, but since a real vent is available, that is superior.

Perfect, Thank you for the confirmation!

 

[Philip6218]

Yes on the venting and the lav drains.

It is possible that the horizontal vents should be kept above the horizontal drain into which the sewage ejector pumps. I'm not sure if that's really an issue or not, not super familiar with ejector pumps. It's a question of what happens in various failure modes and where things overflow first, you don't want them spilling into the horizontal vents. But I think I may be mistaken that it matters.

Cheers, Wayne

I don’t think it’s an issue but I could be wrong. This is my first time messing with a pump in a basement. I don’t think it would be an issue since the pump line and the vent line are isolated from each other. If the pump failed I guess the pit would fill and my basement fixtures wouldn’t flush/drain. I think I’m safe with the horizontal vents up near the ceiling, with any back up happening at my toilet or shower first.

I could be missing a scenario though…
Thanks!