Vent and drain plans

[Jenny B]

Hi guys
I’m helping plan a new bathroom addition for my mom’s place. I’m working out details in google sketchup (I know it’s not perfect, sketchup drives me crazy...ignore the toilet roll in the wall haha and I put a couple of street elbows up in the ceiling that should be regular 90s, and the second vent pipe would be more lined up with the middle wall). Anyways just wondering if this would work, vent and drain wise? I’m thinking now that the toilet drain would be 3” not 4”, but wondering if I can get away with a 2” stack and vents? Is it enough?
I’m still kind of a newbie, about three years but haven’t done a lot of drains so I’m still figuring it all out. Any advice is appreciated.

cheers

 

[Terry]

The laundry sink is not vented.
The toilet needs to drop into a wye fitting, not a santee.
2" will vent those fixtures.

 

[Sponsor]

 

[Jenny B]

The laundry sink is not vented.
The toilet needs to drop into a wye fitting, not a santee.
2" will vent those fixtures.

Thanks Terry,

Is it possible for the washing machine and laundry sink to share that vent to the right of the window? that was my intention anyways...

 

[Terry]

Thanks Terry,

Is it possible for the washing machine and laundry sink to share that vent to the right of the window? that was my intention anyways...

Those vents can combine at 42" above the floor.

 

[Jenny B]

Thanks I'm going to try that. I'm reading all I can on DWV systems, in the meantime.
cheers!

 

[Jeff H Young]

3 inch is good and 2 inch vent. the washer and sink could be verticaly wet vented . Drilling out king stud and trimmer will be required. I used to do it routinely but Im getting shy about that, its often if not usualy kind of an issue structurely.
Or the easy way an AAV at sink!

 

[Jenny B]

3 inch is good and 2 inch vent. the washer and sink could be verticaly wet vented . Drilling out king stud and trimmer will be required. I used to do it routinely but Im getting shy about that, its often if not usualy kind of an issue structurely.
Or the easy way an AAV at sink!

Thanks Jeff! I'm working with a carpenter so he could probably help me with drilling the king stud.
I tried again here - and moved one vent into the middle wall behind the lav. so a vertical wet vent is another way besides an AAV to vent the laundry sink so I don't have to have the window above the flood level?

I'm still getting up to speed on the DWV systems...I just want to get it right the first time since it's going under a slab. eep. Have to learn this though. Are there any online references you'd recommend about venting? I've been reading tons. I live on a teeny island and not a lot of resources here.

(oh and I have pex running through conduits under the floor- that's what the little pipes are in the drawings)

I appreciate this forum, I don't have a lot of people to talk to about this here.
cheers

 

[Jeff H Young]

the laundry sink dosent need to come through the slab just put a santee at the corect height on the vent pointed toward the window drill hole for trap arm. or do as you got on drawing and put an AAV instead of drilling through.

 

[Jenny B]

Okay thanks a bunch - that's great.