3rd Floor Bathroom

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R3Improvements

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I'm remodeling my 3rd floor bathroom. In order to maximize my bathroom, I would like to put a 90 degree elbow in my existing 4" cast iron plumbing stack (it currently runs straight through the middle of the bathroom and exits the roof immediately above the bathroom), run about 3 feet of horizontal pvc at a 1/4" pitch, and then put another 90 degree elbow in and vent it through the roof.

In the 3 foot PVC section mentioned above (horizontal PVC with 1/4" pitch) I would like to tie in the toilet drain pipe. I could vent the toilet as well.

Is this against code?

I apologize, I posted a similar question yesterday, but I'm not sure I was clear in what I was trying to do.
 

R3Improvements

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THe house only has one vertical Waste and Vent Stack. This is the stack/Vent I'm proposing putting the 90 degree elbow in. Is this still a problem?

Thanks for your quick response and help.
 

R3Improvements

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Good advice on checking with local code. If they say it's okay to have 3 baths going into one stack, do you think its okay to do what I origally proposed above?

THanks for all your help. THis website is pretty amazing.
 

Frenchie

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That configuration is pretty common here, in older buildings.

I'm pretty sure the answer is "no". The whole thing has to be straight up & down, no offsets or elbows of any kind, for it to work properly.

If you think about it for a couple minutes, I'm sure you can see why...? :eek:
 
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jdgoodman

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You can not drain a fixture on one floor into the vent of another fixture on the floor below. The toilet on the bottom level is most likley re-vented but the one on the main level is not. I have seen what you want to do done in many homes and it works fine but it is not to code.
 
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