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Old 09-06-2011, 06:58 PM   #1
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180 degree turn in toilet drain


I am re-plumbing my basement bathroom and am second guessing my plumbing route for the toilet. It currently enters at a 90, runs for 16", enters another 90, runs for 8" and takes another 90 before it runs straight into the main stack. I can easily give it a steeper slope to speed things up but am worried that solids may get stuck in the many bends. Expert opinion would be MUCH appreciated!

Below is a link to a picture of the current setup plus a floorplan for measurements:
http://reimann.files.wordpress.com/2011/09/drains1.jpg
http://reimann.files.wordpress.com/2.../floorplan.jpg

Thanks so much!


Last edited by snucky; 09-06-2011 at 07:29 PM. Reason: image changed
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Old 09-06-2011, 07:07 PM   #2
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180 degree turn in toilet drain


Not too many bends but the 3" san tee should be a combination wye & 45 and the next 90 should be a long sweep 90. I would also put a 2" vent on the toilet, but I know codes vary so you may be ok in your town

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Old 09-06-2011, 07:28 PM   #3
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180 degree turn in toilet drain


Thanks for the quick response! I hear you on the "gentler" bends. I'll go to the hardware stores to pick up those fittings.

There is a 2" vent right behind the Wye fitting - I marked it in the image. Knowing this, would you still install an additional vent? If so, what would you replace the 90-elbow right under the toilet with?

http://reimann.files.wordpress.com/2011/09/drains1.jpg
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Old 09-06-2011, 08:19 PM   #4
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180 degree turn in toilet drain


Also, I got the response on another board that the maximum change of direction on a horizontal run is 135 degrees. Any comment to that? Thank you!!
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Old 09-07-2011, 12:10 AM   #5
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180 degree turn in toilet drain


135 degrees is on a trap arm, a toilet drain can use one more 90 degree bend, for a total of 225. This includes the 90 going up.
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Old 09-07-2011, 09:16 AM   #6
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180 degree turn in toilet drain


225 max including the 90 that changes vertical to horizontal would still mean that I am over.

I've got 180 horizontal + 90 vertical, that's 270 total.

I'm gonna have to replumb this ... oh well - i'm so thankful i asked before I poured the cement back in!
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Old 09-07-2011, 06:53 PM   #7
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180 degree turn in toilet drain


Put the wye & 45 just upstream of the 3x2 that is shown between your feet. This will give you a straight shot to the flange location with maybe a slight offset made with a 22.
Still didn't see the toilet vent in the vent picture. You could put a 3x2 wye rolled up above the flow line of the toilet branch. Pipe it to the plumbing wall behind the toilet.
Edit: Actually, in your current configuration you have 2 90's and a 45(change the tee to a combo)= 225


Last edited by TheEplumber; 09-07-2011 at 06:59 PM.
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