All, thank you for the help.

I am remodeling a bathroom and fall under IPC 2018 and was hoping that folks could look over the design below and let me know if this was code compliant and if follows good practice. Basically I was wondering if the proposed layout worked as a wet vent system or if I needed to open the wall and run new individual vents. Any suggestions are welcome.


[drive.google.com]

[drive.google.com]

[drive.google.com]



Edited 1 times.

you will need to add a vent for the toilet which previously was wet vented by the lavatory


you will need to relocate the tub's vent as well, which possibly could act as the new wet vent for the toilet


but


you may as well individual fixture vent as per 'best practice' as you need to open the wall(s) anyway

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

i'm gonna say you are OK.

the toilet and shower are stack vented.

the sink does not need a vent if it is within 5 ft of the stack. (ma code).

the concern here is the flushing toilet water will syphon the shower trap.

that will never happen because of the 3 inch vent thru the roof.

if the shower was on the downstream side of the toilet, that would be a no/no.

what you have is the shower is connected to the toilet vent.

yep, as packy stated, you meet the MINIMUM code requirement

however

? why would you not want best practice by individually fixture venting on NEW DIY WORK ?

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Thanks for the feedback. I thought it was meeting the minimum but didn't know for sure and if so if it is what I should do. For learning sake can you explain the risks/drawbacks of the single stack vent vs benefits of individual vents? If I install individual vents would you recommend demo'ing out the existing 3" and tying into a single vent header in option 1 or leave the existing 3" and tie in individual bath and toilet vents as in option 2?

[drive.google.com]
[drive.google.com]


I appreciate the feedback as trying to learn the benefits of different approaches.



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opt 1 = toilet is wet vented by sink, sink & bath are dry (individual) vented

opt 2 = best practice toilet dry (individual) vented as is the sink & bath

YOU are providing the labor

YOU are spending a few pennies more in material

YOU will build a 'best practice' plumbing group


YOU (and your wallet) will know the difference 'down the road' as no individual fixture stoppage will affect the venting/flow of another fixture ..............

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Makes sense and I would much rather to it right the first time. Looks like my design is coming along and just a few more clarifications.

[drive.google.com]

1. Is 1 1/2" sufficient for all of the venting header?
2. Is a 3" wye and 1/8 the appropriate fitting to go to toilet? No need for closet fitting in this case, correct?
3. I know the 2" for bath/shower combo is more than required but seems like less chance of future issues.
4. Any other recommended changes?



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run as much vent in 2" as possible

if the sink drain is 1-1/2 run THAT 'riser vent' in 1-1/2

remember to pitch the vents juuust slightly downhill towards the fixtures for condensate run-off (no pockets)

a y and 1/8th is just fine

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

just keep all the vents 2 inch.
everything looks top shelf..

Thank you both for the help. Much appreciated.



Edited 1 times.

After reviewing the code a bit more I have a few more questions.

1. There are currently no clean outs and I wasn't planning on adding any. Is this an issue?
2. The existing installation changes from pvc to abs and back quite a bit. Will the inspector have an issue with this?


[drive.google.com]

[drive.google.com]



Edited 2 times.

After reviewing the code a bit more I have a few more questions.

1. There are currently no clean outs and I wasn't planning on adding any. Is this an issue?
2. The existing installation changes from pvc to abs and back quite a bit. Will the inspector have an issue with this?

[drive.google.com]

[drive.google.com]



Edited 1 times.