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Old 09-10-2017, 04:08 PM   #1
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Toilet drain, slope, vertical, then slope?


Wondering if this would cause an issue with drainage:

I plan to put a toilet about 8 or so feet from the waste stack. I can slope it for about 4 feet, then the drain is obstructed by a cross joist, due to how the floor was rebuilt some years ago. However, the floor below actually drops down a few feet, and is open from there to the stack. So I can put a elbow and a vertical, then I need to go to the stack again which is another 3 or 4 feet.

Will putting a vertical in between two slight slopes between toilet and stack be OK?

I attached a picture for clarification.
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Old 09-10-2017, 07:51 PM   #2
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Re: Toilet drain, slope, vertical, then slope?


That should be fine. It's done all of the time. Are you using the stack as the vent?
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Old 09-10-2017, 08:00 PM   #3
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Re: Toilet drain, slope, vertical, then slope?


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That should be fine. It's done all of the time. Are you using the stack as the vent?
Yes, the stack goes straight up and is vented out the side of the house, above a lower level roof.

What if I went 45 degree instead of vertical for the short section that has to go under the joist?
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Old 09-10-2017, 08:15 PM   #4
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Re: Toilet drain, slope, vertical, then slope?


45s would probably be better. Less chance of clogging.
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Old 09-11-2017, 07:44 AM   #5
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Re: Toilet drain, slope, vertical, then slope?


Is this getting inspected? I think 8ft is greater than the allowable distance from the toilet to the vent.
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Old 09-11-2017, 08:35 AM   #6
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Re: Toilet drain, slope, vertical, then slope?


I think you want to wait for our plumbers to explain trap arm distances and horizontal run/slope.
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Old 09-11-2017, 08:57 AM   #7
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Re: Toilet drain, slope, vertical, then slope?


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I think you want to wait for our plumbers to explain trap arm distances and horizontal run/slope.
I think 10 ft for 4" pipe. not sure about the drop in the center.
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Old 09-11-2017, 09:35 AM   #8
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Re: Toilet drain, slope, vertical, then slope?


use 45 offsets.
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Old 09-11-2017, 10:05 AM   #9
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Re: Toilet drain, slope, vertical, then slope?


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Is this getting inspected? I think 8ft is greater than the allowable distance from the toilet to the vent.
It's not getting inspected. I think the distance will probably be a total of 7ft, including the vertical or 45 degree drop, whichever I end up doing.
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Old 09-11-2017, 12:24 PM   #10
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Re: Toilet drain, slope, vertical, then slope?


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Originally Posted by MTN REMODEL LLC View Post
I think you want to wait for our plumbers to explain trap arm distances and horizontal run/slope.
THIS IS FROM A GC... I'm not a plumber.... but...

Normally, a trap arm is governed by a 1/4 slope before hitting it's vent.... and the length of that run is governed by the pipe size (which I think varies by UPC and IRC codes.

However, I am not sure of, and confused, in regard to a toilet... which to a limited sense (in time) has a self restoring trap.

Hence, I would wait for one of our professionals (whether you are under permit or not)

Just a personal opinion...

Good luck
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Old 09-11-2017, 05:30 PM   #11
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Re: Toilet drain, slope, vertical, then slope?


New York I can't help.
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Old 09-11-2017, 05:33 PM   #12
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Re: Toilet drain, slope, vertical, then slope?


That wouldn't fly around here. Looks like about 22' of pipe to the vent to me. 8' horizonally, 1' vertically plus 2 90s (+6' per 90). I'm sure there's a way to cut in a vent and run it back to the stack up high. AAV's are another option.
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Old 09-11-2017, 09:35 PM   #13
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Re: Toilet drain, slope, vertical, then slope?


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Originally Posted by MTN REMODEL LLC View Post
I think you want to wait for our plumbers to explain trap arm distances and horizontal run/slope.
UPC is 3"= 6' arm. That's from the flange to the tee. 4" is 10ft

The offset wouldn't fly
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Old 09-12-2017, 06:07 PM   #14
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Re: Toilet drain, slope, vertical, then slope?


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UPC is 3"= 6' arm. That's from the flange to the tee. 4" is 10ft

The offset wouldn't fly
I'm using 4" all the way.

I'm confused, so you guys are saying a 90 elbow adds 6 virtual feet to the overall length for venting purposes.

What about a diagonal with two 45s, would that be any different?
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Old 09-12-2017, 06:14 PM   #15
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A 45 would be better but but you still won't have a proper vent. Will it work? Maybe. Just get a real vent or even an aav up.
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