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 Toilet Drain Question (Revised)
Author: Anonymous User

I am remodeling a 2nd floor closet located in the center of my house into a bathroom. I have installed the toilet flange and waste drain using 3" pvc. and can maintain a slope of 1/4" per foot the entire length of the drain. I have two questions regarding the toilet drain.

1) Are there any limitations on the number of 90 degree bends I can have in the 3" drain line?

2) I will need tie into the existing cast iron drain at a flange. Is there a way to connect a 90 degree pvc bend to the existing cast iron flange.

Thanks very much.

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 Re: Toilet Drain Question (Revised)
Author: Deb (ID)

Did you vent this?

UPC code requires a cleanout for every 135 degree change in direction for horizontal pipe. Try to use 45s and make long sweeps, rather than using 90s.

You can use no hub couplings to connect cast iron pipe to PVC (or ABS) pipe, but I don't think you can connect from a PVC 90 to a cast flange--you will need pipe in between.

Deb
The Pipewench

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 Re: Toilet Drain Question (Revised)
Author: packy (MA)

break the old cast iron flange and remove the lead. you now have a 4" piece of pipe staring at you. slip a 4X3 no hub coupling over it. put a 3" street ell into the nh coupling. tighten it up and you should be all set. install a clean out tee within a few feet..

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 Re: Toilet Drain Question (Revised)
Author: Anonymous User

Thanks Deb,

I did vent with a 2" wet vent that will also serve as a sink drain. The vent is located about 18 inchs "downstream" of the toilet flange. Is there a rule of thumb for how many 90 degree bends that you can reach with a single cleanout (if the cleanout is also a "T";).

Thanks again,
Dave

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 Re: Toilet Drain Question (Revised)
Author: Anonymous User

Wonderful. Exactly what I was looking for. Thanks for the advice. I read somewhere that some code would allow for a 1/8 inch per foot slope if you are using 3" pipe. Is there any truth to this?

Dave

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 Re: Toilet Drain Question (Revised)
Author: packy (MA)

only code i know about is massachusetts and it wants 1/4" per foot.

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 Re: Toilet Drain Question (Revised)
Author: Deb (ID)

I suppose that some of the real pros out there can negotiate numerous 90 degree bends with a snake. The real goal here is not to ever need the cleanouts. They are however, fairly inexpensive. I usually install a fair number of test tees when I plumb a house. Cleanouts are required at the base of all stacks and for every 135 degree of horizontal change of direction.
Deb
The Pipewench

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 Re: Toilet Drain Question (Revised)
Author: hj (AZ)

If you are connecting at a flange, it implies that you are using an old toilet connection. If so, the elbow at that point does not have even the minimum legal radius to use as a connection point. It is essentially a square corner, not a sweeping turn.

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 Re: Toilet Drain Question (Revised)
Author: Anonymous User

One more question Deb. Do the clean outs need to be located at the end of a horizontal run, or can they be a "T" that is located in the middle of a run? (I have access issues)

Thanks again

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 Re: Toilet Drain Question (Revised)
Author: Deb (ID)

Yes. This is one reason that I like to use test tees. You can put them anywhere on your horizontal run and clean from both directions.

Deb
The Pipewench

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