Drain pipe size help new construction

[riley9999]

I plumbed in the toilet with 3", see pic attached, with a low heel elbow and a 2" vent to the roof. This is my main vent that I am connecting the other vents from the clothes washer, double bathroom sinks and shower to - above the ceiling and before the roof.

At the other end of the house I separately vented a double kitchen sink and dishwasher with 1 1/2" through the roof.

I am draining the kitchen with 2" pvc 32 feet to the shower and then 8 feet to the clothes washer, 4 feet to bathroom sinks and 4 more to tub then to wye opposite toilet in pic. All drops are 1/4" every foot.

Do I need to increase to 3" around clothes washer?
Do I need to run a vent off top of riser?

 

[frodo]

your 1 over on fixture units,, for the upc code

you need to run 3" to the first combo

the combo you have in now, can you swap that out to a double wye ? see drawing

where are you at, what state? need to know for code

 

[frodo]

3" trunk line

 

[riley9999]

Thanks frodo, I think you nailed it! I glued the toilet drain in place. I believe a wye makes the drop too flat for the kitchen but I could extend the 4" at the base where I placed a cleanout.

Does the riser need a vent off the top or are the individual ventings enough?
Thank you again

 

[frodo]

not sure i understood your question, each fixture gets a vent.
the waste stack you are running will terminate at the kitchen sink with a vent out the roof
. inmo. you need a c.o, on your kitchen sink and on your washer,

STOP using 90's on your rough in! use a combo and a cleanout


even tho long sweeps are legal, they are BAD, BAD, BAD, LONG SWEEP
bad plumbing practise , not good workmenship. mho
stuff gets caught up there and causes clogs.
use a combination as the 90 with a cleanout attached.

 

[riley9999]

Thanks again frodo, I have a cleanout at the 1 1/2" and the 2" at the kitchen end. I have a 3" cleanout at the top end of the toilet run. I like combo's and c.o.'s and take that advice.

My question comes from always seeing a stack that drains from the second floor and vents to the roof and my half stack does not have a vent off the top! Since all units are vented, I am OK.

 

[frodo]

sounds like you got it going on! post some pictures when you get it finished. if you need anything, holler


oh, btw, but put some of that strapping every 4' on your pvc pipe.
it will sag over time.