Rule for tying in a drain after a water closet?

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Tbbarch

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Is there a rule for how close I can tie in a 2" horizontal drain after a water closet?

The water closet is 23" from a stack vent that will be a future waste stack and the 2" is going between the water closet and stack.

Thank you
 

Tbbarch

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As long as the 2" drain is properly vented, and the connection is made properly, you should be fine.

Properly?
The only proper I am aware of is water flows down hill, pipe joints point in the direction of flow and pipe fittings don't leak.
Is there something else I need to be aware of?
 

hj

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don't go pedantic on us. There are many ways, DIYers have managed to connect things "improperly" and they have nothing to do with the physical laws of fluids.
 

Reach4

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Trap from shower goes to a 2 inch horizontal up to 6o inches (slopes down 1/4 inch/ft) trap arm until it hits a vent.
Vent goes vertically (defined as 45 degrees or more) until it is high enough 42 inches above the floor unless the vent is a permitted wet vent, where the vent must continue vertically far enough above the flood level of that fixture.

https://terrylove.com/forums/index.php?threads/max-trap-arm-length-for-a-shower-drain-2.4013/

There will be some limitations on what kind of fitting can join the sewage pipe to the vent.

https://terrylove.com/forums/index.php?threads/multilevel-toilet-dwv-design.61777/#post-457649

And there is more to it.
 

Terry

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Properly?
The only proper I am aware of is water flows down hill, pipe joints point in the direction of flow and pipe fittings don't leak.
Is there something else I need to be aware of?

Venting.
If you don't vent the shower, the trap can siphon. If that happens, you won't be liking it.
 

Tbbarch

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pedantics aside
 

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Tbbarch

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Unless the 2" line is vented upstream (outside of the photo), it is not correct.

The 2" line is vented. It services a tub and lavatory. The vent is 1 1/2" at the top of the lav vertical line in the wall.

I was under the impression though that if the slope of the 2" was correct and was within the distance limitations it could serve as a wet vent.

What code applies to the 2" needing to be vented based on the photo?
 

Cacher_Chick

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You are correct in that it could serve as a wet vent if it is done correctly. We cannot see what is not in the picture.
 
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