Bathroom Under slab plumbing

[JaysonG]

I've helped plumb a few houses but am a little rusty.. does this layout look like it would pass inspection? In a basement under slab.

3" from sink to sewage pump to act as a "wet vent".

3" to toilet.

2" to shower with a 2" running over to the sink as it's vent. I would run that up beside the sink and tie it back in above the fixture so I only have one vent running up.

The pipe heading off the page on the right goes to a sink 50' away that would have it's own vent.

Any thoughts would be appreciated. Thanks

 

[havasu]

This isn't my wheelhouse but I think you're lacking proper venting. Wait for an expert to chime on, once they scrape the crap from their fingernails after a hard day's work.

 

[breplum]

I always recommend you have a local licensed plumber do the under slab and have it inspected…then you can top it out.
Also, water heater needs a drain safety pan piped to outdoors.

 

[JaysonG]

From what I remember, it is code to wet vent the bathroom through a lavatory. I figured 3" would make it overkill for venting. Don't remember the legal lengths or correct order though... Also, the water heater I hope to have a drain going to the tile that gets sumped out. Never been a fan of basement floor drains going into the septic since if they dry out they smell.

 

[MicEd69]

The vent for the shower should be attached to the top of the drain line, or no more than 45 degrees off vertical, within 5 to 8 feet from the P-trap weir, depending on which code you are under, and be vertical or no more than 45 degrees off vertical until it reaches 6" above the flood level of the fixture where it can then go horizontal at a 1/4" per foot slope. However, it can be wet vented through a horizontal line if connected to the drain line as described above. That would require you to drain one of the sinks through that 2" "vet line" you show for the shower.

The problem with horizontal dry vents below the flood level of the fixture is that they can become plugged if there is nothing that "washes them out". That is why codes do not allow them.

Another option would be to run the shower drain over to the basement wall and run the vent vertical up in the corner of the linen shelves area. It would then need to connect to the main 3" vent in the attic or be a separate vent through the roof.

All the lines converging in the sewage pit can be messy. You should review the fittings and the layout with your local jurisdiction, as well as your finished layout.

 

[JaysonG]

Just an update, did the below and I'm happy with it. Inspector was as well except he was thinking I should have used 2" instead of 3" =). Thanks for the thoughts.

 

[Twowaxhack]

Just an update, did the below and I'm happy with it. Inspector was as well except he was thinking I should have used 2" instead of 3" =). Thanks for the thoughts.
View attachment 39848

Just an update, did the below and I'm happy with it. Inspector was as well except he was thinking I should have used 2" instead of 3" =). Thanks for the thoughts.
View attachment 39848

2” would’ve been fine. 3” is ok.