Crowded quarters venting issue

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orcas

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Hi:

I am installing a small bathroom with a shower, w/c, and hand sink on a second story. The bathroom is serviced by a 3" soil stack. I am very constricted in vertical runs as the structure has double rim joists (total 4" thick) under the 2x6 wall framing, leaving only a little more than an inch to pass between floors within the wall cavity.

I think I managed the w/c by going with a wall hung unit mounted on a 2x6 bump-out. It drain to the stack via a Y fitting at about a 45 degree angled run of about 3 feet. I currently have no vent above the entrance into the stack, ok so far?

My bigger challenge is the shower; my intention is to run it into the other branch of the Y (this is a three-pronged Y, the middle is the continuing vent to the roof), my problem is finding a way to vent it. As I mentioned above, I can't pass pipe more than an inch (OD) between floors within the exterior walls. To complicate matters further, the one interior wall of the shower is directly over an engineered I joist, if I cut out enough for a pipe to pass the joist would be essentially useless.

I think this question has been asked about a million times, but here's one more; if the shower trap and line, 2 inch pvc, is in within 5 feet of tying into the stack do I still need a vent upstream from the stack. The project is in Washington state, if that makes a difference cade-wise.

Just to tie up loose ends, that hand sink will tie into the stack about 2 feet above the Y, 1 1/4 inch, it will be the terminal fixture, but I can put a dedicated vent on it as it is above the double rim joist blockage.

Sorry for the wordiness, but I hope I presented things adequately. I have looked at this site a number of time and greatly appreciate the knowledge that is shared.
 

orcas

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on further examination, I could use 3 inch pipe from the 2 inch p-trap to the stack, it would run at a 45 degree angle for part of the way, the distance between the p-trap/drain and stack is about 3 feet.
 

orcas

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here is a picture of the aforementioned Y, left branch and center are w/c and vent respectively, right unglued branch is for shower.

Sorry for dribbling information in with multiple submissions, I'm no better at posting than plumbing.
 

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Terry

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In Washington State, UPC Plumbing code, the lav can wet vent the shower and the toilet, assuming it's done right.
If you intend to have a trap arm over to the shower, up to 60", venting on the vertical is by a santee, not a wye.
abs_santee.jpg
Santee
If you put a vent somewhere on the horizontal trap arm, then that fitting would be a combo or wye with 45.
What you have now as I see it, would not work.
 
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orcas

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Here is an upside down drawing of what I am thinking with a 3" pipe run. There is a bit of contortion to get to the Y, but I'm hoping the "over-sized" pipe will handle it, sans upstream vent. Will this pass muster?
 

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orcas

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Hi Terry, just saw your response after posting my drawing, sounds like that idea is a no go. So I have a wye in place and can get a 45 into it, but I will need to find a way to run a vent, minimum 1 1/2 inch I understand, from the shower leg upstream from the Y, no other way?
 

orcas

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So I think I can build a shower seat to give me passage for a vent pipe, my new question is may I install a crown vent at a 45 degree angle and run the vent pipe with 1/4 to 12 slope for a couple of feet under the drain or must the vent be 45 degrees plus until above the rim of the shower?
 

Terry

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You could run the 3" on the left farther down and tie in low with a wye. That gives you some room to work that shower and vent in better. It's pretty crowded with the double wye.
 
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