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Old 04-10-2016, 02:48 PM   #16
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Re: toilet vent layout picture


OK decided to drain n vent separately and tie in vents before roof line penetration. Not glued yet......works?
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Old 04-10-2016, 03:04 PM   #17
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Re: toilet vent layout picture


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OK decided to drain n vent separately and tie in vents before roof line penetration. Not glued yet......works?
No, not compliant. Can not have santees on their backs.
The vertical combo needs to be a santee.
At the start of the thread, I thought you had limited room.. You can and should eliminate the flat vents.

Where are your partitions above? Put the drain, as I pictured, below a partition and serve the group with one vent.... it's the simplest way and cheapest. What you have dry fitted is a waste of fittings and a inferior design- no offence meant.
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Old 04-10-2016, 03:25 PM   #18
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Re: toilet vent layout picture


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No, not compliant. Can not have santees on their backs.
The vertical combo needs to be a santee.
At the start of the thread, I thought you had limited room.. You can and should eliminate the flat vents.

Where are your partitions above? Put the drain, as I pictured, below a partition and serve the group with one vent.... it's the simplest way and cheapest. What you have dry fitted is a waste of fittings and a inferior design- no offence meant.
lol, no offense. I want straight feedback on what i'm doing to get it correct. I'm building a small granny unit myself and the drain vent code has always confused me. Water and gas no issue.

I understand and will remove the sani and put a wye. I'll move the mini stack to rear towards foundation wall. My hesitation was that I'd be adding additional drain 90 to get to main horizontal, but since i'm using 4" from toilet should be fine. I'll just use long sweeps.

The wall above foundation is exterior so I can rise up through there. I'll put together and post hopefully my final before glue model.

Be hard on my work, I appreciate it and learn from it...my intent here is to learn so don't hold back.

Thanks for feedback so far.
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Old 04-10-2016, 03:50 PM   #19
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Re: toilet vent layout picture


This image will serve a bathroom group per UPC. This is a typical wet vet.
The max. trap arm for a toilet is 72"
Max tub or lav trap arm is 3'6"
All you need to do is locate the 2" vertical vent in a partition that satisfies the trap arm lengths. Usually the vent will be located in the same wall as the toilet and lav.
If you apply the 3'6" trap arm lengths to the image below- that equals 7' between the 2 traps before having to re-vent a fixture.

Now, to complicate it more-- the cross sectional area of your vents through the roof of your home must equal the cross sectional area of the bldg. drain, which in your case is 3" based on DFU's served.

Area of a 3" = 7 sq in.
Area of a 2" = 3.14 sq in
So you need 2 - 2" and 1- 1.5" vents through the roof. Or 1 - 3" vent.
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Old 04-10-2016, 03:57 PM   #20
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Re: toilet vent layout picture


I'm venting the bath sink and the kitchen sink together on 1 1/2" vent through roof, and the laundry on its own 1 1/2" vent throught roof. So just toilet and tub on 2" through roof....if I ever get to building the roof lol
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Old 04-10-2016, 05:51 PM   #21
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Re: toilet vent layout picture


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I'm venting the bath sink and the kitchen sink together on 1 1/2" vent through roof, and the laundry on its own 1 1/2" vent throught roof. So just toilet and tub on 2" through roof....if I ever get to building the roof lol
You should have 2 - 2" vents and 1 - 1.5" to equal the 3" bldg drain. Change one of them to 2" and you should be OK
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Old 04-11-2016, 02:58 PM   #22
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Re: toilet vent layout picture


OK so I think I have correct but please advise. I think I will change 3" toilet to a bit further down on the 3" horizontal to reduce 90 s. I'll UE a wye since horizontal..will that be OK?
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Old 04-11-2016, 05:55 PM   #23
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Re: toilet vent layout picture


OK...not glued but OK? Vent rising above where tub ptrap drains. Let me know
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Old 04-11-2016, 06:57 PM   #24
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Re: toilet vent layout picture


Don't sweat the 90's the way you had it in #22 is fine except the 2" 90 should be changed to 45's to eliminate the horizontal vent.

I don't think the last set of pictures will pass inspection... again, don't be afraid of the 3" 90's

Edit: you can bush the top of 3" sant down to 2" to receive the 1.5" tub drain. You don't need the 3" wet vent section. That will gain some height to build the 45 vent offset
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Old 04-11-2016, 08:21 PM   #25
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Re: toilet vent layout picture


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Don't sweat the 90's the way you had it in #22 is fine except the 2" 90 should be changed to 45's to eliminate the horizontal vent.

I don't think the last set of pictures will pass inspection... again, don't be afraid of the 3" 90's

Edit: you can bush the top of 3" sant down to 2" to receive the 1.5" tub drain. You don't need the 3" wet vent section. That will gain some height to build the 45 vent offset
So on first pick, just use a 2" sanitee above the 3" toilet sanitee? I have some of the bushings to down size. Yes, that was causing some grief so the extra space should do it to use a 45.

In the second pic, I'm just a bit confused as to why moving the toilet drain down a couple of feet to the horizontal with a wye would fail? I'd just like to know for my knowledge so appreciate more on that. The 90's are a concern as I could only imagine clogging chances increase with a 3" and those 90's......but I guess I could always adjust if needed down the line.

Thank you!
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Old 04-11-2016, 08:46 PM   #26
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Re: toilet vent layout picture


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So on first pick, just use a 2" sanitee above the 3" toilet sanitee? I have some of the bushings to down size. Yes, that was causing some grief so the extra space should do it to use a 45.

In the second pic, I'm just a bit confused as to why moving the toilet drain down a couple of feet to the horizontal with a wye would fail? I'd just like to know for my knowledge so appreciate more on that. The 90's are a concern as I could only imagine clogging chances increase with a 3" and those 90's......but I guess I could always adjust if needed down the line.

Thank you!
Yes, a 2" santee. The branch to the tub can be 1.5"- thats a tubs drain size.

In your second picture-- A vent needs to come of above the center line of the drain- yours comes off the end.

As for clogging a 90- look at the toilet trap pattern on the side of your toilet. That is less than 3" diameter. How many times have flushed a toilet without clogging it? Granted, you can get carried away with 90's but this layout doesn't
The way I drew it is a pretty standard arrangement- used quite often.
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Old 04-11-2016, 08:56 PM   #27
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Re: toilet vent layout picture


Perfect, will glue it up tomorrow and on to gas and water!

Thank you!

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Old 04-11-2016, 09:00 PM   #28
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Re: toilet vent layout picture


You're more than welcome
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Old 04-11-2016, 09:01 PM   #29
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Re: toilet vent layout picture


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As for clogging a 90- look at the toilet trap pattern on the side of your toilet. That is less than 3" diameter. How many times have flushed a toilet without clogging it? Granted, you can get carried away with 90's but this layout doesn't
The way I drew it is a pretty standard arrangement- used quite often.

From a functional POV, (as it was explained to me)
Drain lines should run vertical or horizontal, pitched to approx 1/4" per foot.
The shallow pitch will cause any solids to float down the line with a rush of water. Where a steeper angle might allow the fluid to rush down first with solids possibly clinging to the side walls.
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