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Old 04-10-2012, 06:19 PM   #1
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Pipe fittings and slope


Hi all,

I've read that when installing a toilet drain, the slope should be around 1/4" per foot. What I don't understand is this--when you have a pipe with a slope like this, and then you connect a 90-degree closet bend and a vertical pipe, how do you prevent the vertical pipe from also having a slope? I've attached a drawing in case I'm not explaining well.

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Old 04-10-2012, 09:45 PM   #2
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Pipe fittings and slope


The old screw fittings were actually tapped @ 1/4" ft grade. Modern plastic drainage fittings have enough play to allow for minor adjustment. It's not an issue until you drastically exceed 1/4"ft

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Old 04-10-2012, 09:49 PM   #3
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Pipe fittings and slope


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Originally Posted by slkarns View Post
Hi all,

I've read that when installing a toilet drain, the slope should be around 1/4" per foot. What I don't understand is this--when you have a pipe with a slope like this, and then you connect a 90-degree closet bend and a vertical pipe, how do you prevent the vertical pipe from also having a slope? I've attached a drawing in case I'm not explaining well.

Thanks!
eplumber is right.... its not a problem at 1/4 " per foot with play in the fittings .....
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Old 04-11-2012, 12:23 AM   #4
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Pipe fittings and slope


Depends on how far you are from the stack,most are close enough that you dont need major fall in the pipe.
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Old 04-11-2012, 03:00 PM   #5
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Pipe fittings and slope


So would ''enough play" mean you could fit the pipe in the red portion of the diagram provided into the cup of the fitting, at an angle so that it runs vertical (again refering to the red pipe in the diagram). Hope this makes sense.
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Old 04-11-2012, 09:54 PM   #6
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Pipe fittings and slope


Depends what code your under, IPC 1/8 per foot on a 3 and up sanitary line.
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Old 04-11-2012, 10:06 PM   #7
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Pipe fittings and slope


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So would ''enough play" mean you could fit the pipe in the red portion of the diagram provided into the cup of the fitting, at an angle so that it runs vertical (again refering to the red pipe in the diagram). Hope this makes sense.
At 1/8" or 1/4" per ft- it will go to vertical

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