DIY vent design

[Graham Love]

Im adding a basement bath (WC,Lav, Shower and Washing Machine). Can I pipe the bath group into a "dry vent" and hook it into a 2" drain line serving a sink and dishwasher from the floor above. This 2" drain line is a common 1.5" dry vent above the dishwasher/ kitchen sink.

 

[James Henry]

Don't be demanding. Go online and learn how to properly illustrate a plumbing layout proposal with sketches, dimensions and actual photos then you will get all the help you need.

 

[Sponsor]

 

[Graham Love]

Sounds good, Thank you for the advice.

 

[GReynolds929]

Have you asked your Jman, or Master?

 

[Jeff H Young]

Are you asking if the vent from basement can connect to another vent yes you can do that . but if you want to connect the vent from bathroom in basement to a drainline above no that cant be done.

 

[Graham Love]

Have you asked your Jman, or Master?

No, I am looking for DIY help.

 

[Graham Love]

Are you asking if the vent from basement can connect to another vent yes you can do that . but if you want to connect the vent from bathroom in basement to a drainline above no that cant be done.

 

[Graham Love]

Yes, that is what i was asking. I attempted a better drawing per James Henry's advice.
But, per your response, i will need to edit the dry vent connection from the basement bath to a point above the kitchen sink. Thank you for your help!

 

[Graham Love]

Don't be demanding. Go online and learn how to properly illustrate a plumbing layout proposal with sketches, dimensions and actual photos then you will get all the help you need.

Yup, a little research and I have a much better drawing now.

 

[Graham Love]

Don't be demanding. Go online and learn how to properly illustrate a plumbing layout proposal with sketches, dimensions and actual photos then you will get all the help you need.

 

[wwhitney]

Other venting issues:

- You need to provide a dry vent for the lav
- The shower and WC dry vents don't work, you can't run a dry vent under the slab. The dry vent takeoff has to be vertical (at most 45 degrees from plumb) and stay vertical until at least 6" above the fixture flood rim.
- UPC or IPC? You have the option to wet vent the WC and/or shower if you can get the dry vented lav drain (on its own, with no fixtures from outside the bathroom) to the WC and/or shower drains.

Cheers, Wayne

 

[Graham Love]

Other venting issues:

- You need to provide a dry vent for the lav
- The shower and WC dry vents don't work, you can't run a dry vent under the slab. The dry vent takeoff has to be vertical (at most 45 degrees from plumb) and stay vertical until at least 6" above the fixture flood rim.
- UPC or IPC? You have the option to wet vent the WC and/or shower if you can get the dry vented lav drain (on its own, with no fixtures from outside the bathroom) to the WC and/or shower drains.

Cheers, Wayne

I redited the drawing to show independent dry vent for the Lav and wet vent the WC & shower.
IPC

If it ends up being easier- can I run the dry vent to the 3" Main stack instead of the secondary kitchen vent.

Thank you all for the help!

 

[John Gayewski]

I suggest you add a cleanout on the wet vent around the toilet area. Your have 5 90° bends in that wet vent section maybe after the first two 90's make an accessible cleanout.

 

[Graham Love]

I suggest you add a cleanout on the wet vent around the toilet area. Your have 5 90° bends in that wet vent section maybe after the first two 90's make an accessible cleanout.

I added a cleanout to the drawing. Thank you!

 

[wwhitney]

Is this UPC or IPC?

For the UPC you have a problem because the WC needs a 2" vent path to the roof. So the lav dry vent needs to be 2" and can't connect to the 1.5" dry vent you show upstairs on the kitchen sink. IPC only requires a 1.5" dry vent for the WC, so this is not a problem.

Additional requirements for the UPC (a) the distance from the shower trap to the combo where it joins the lav is at most 60", and the fall at most 2" and (b) the distance along the pipe from the closet flange to the wye where the WC drain joins the lav and shower is at most 72".

The IPC gives you more flexibility--you may join the lav drain to the WC first, rather than having to bring it around to the shower drain, and the shower trap arm may be 8' long (although that requires a perfect 1/4" per foot slope). And the WC fixture drain length is unlimited.

Cheers, Wayne

 

[Jeff H Young]

I dont know what centenial means? need to know where the job is or the code in place

 

[Graham Love]

I dont know what centenial means? need to know where the job is or the code in place

Hi Jeff,
I am just outside Denver CO. I believe I am under 2021 IPC

 

[Jeff H Young]

1 1/2 might be ok then! are you a relative of Terry Love? not such a common name Either way you are getting help thats good

 

[Graham Love]

Is this UPC or IPC?

For the UPC you have a problem because the WC needs a 2" vent path to the roof. So the lav dry vent needs to be 2" and can't connect to the 1.5" dry vent you show upstairs on the kitchen sink. IPC only requires a 1.5" dry vent for the WC, so this is not a problem.

Additional requirements for the UPC (a) the distance from the shower trap to the combo where it joins the lav is at most 60", and the fall at most 2" and (b) the distance along the pipe from the closet flange to the wye where the WC drain joins the lav and shower is at most 72".

The IPC gives you more flexibility--you may join the lav drain to the WC first, rather than having to bring it around to the shower drain, and the shower trap arm may be 8' long (although that requires a perfect 1/4" per foot slope). And the WC fixture drain length is unlimited.

Cheers, Wayne

Wayne,
This is IPC, so I edited drawing to wet vent the lav directly to WC 3" and the shower drain connects to driectly WC drain under 8'.

 

[Graham Love]

1 1/2 might be ok then! are you a relative of Terry Love? not such a common name Either way you are getting help thats good

Not that I know of, but I wouldn't be surprised if our family trees meet up somewhere? Very appreciative of all the experts knowledge, this is all fun for me.