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Old 12-29-2014, 12:21 PM   #1
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What is the correct toilet drain with dry vent upstream?


I currently have a toilet drain that drops below the joist space and I would like to get it within that space. Why wouldn't I?!

Right now it's a huge pipe and it's the only thing on the branch. I'm almost positive it's a 6" pipe. I'm going to downsize to 4", maybe 3". It has a dry vent that comes off the back of a cast elbow with a smaller connection on the curve. See attachment. (turn the image 90degrees CCW)

The vent comes off horizontally. Is this correct or acceptable? I feel like it's probably always clogged. Should it be toilet flange -- sanitary to horizontal vent line(or combo?) -- elbow? Can this be achieved within the joist space?
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Last edited by awsnap; 12-29-2014 at 12:21 PM. Reason: clarify image
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Old 12-29-2014, 12:30 PM   #2
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what is your location.i would bet its 4", i dont know of any residence with a 6" main. That fitting is not legal where i am.
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Old 12-29-2014, 12:53 PM   #3
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I'm in PA. Well, you know, you may be right. I was basing that off of the PVC pipe that was installed because the cast pipe was cracked and seeping. So 6" PVC may be about the size of 4" cast... I KNOW the PVC is bigger than 4".

If it's not legal, would you do it how I described?
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Old 12-29-2014, 02:30 PM   #4
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If the low heel 90 is used as shown in the picture it's legal
I bet yours is draining a tub or lav and you are close to a main stack- which is venting the toilet
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Old 12-29-2014, 03:24 PM   #5
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Even with it turned 90 degrees and the heel is then coming out horizontally on the bottom? I only have one floor and this does not drain anything through the smaller connection.
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Old 12-29-2014, 07:06 PM   #6
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Quote:
Originally Posted by awsnap View Post
Even with it turned 90 degrees and the heel is then coming out horizontally on the bottom? I only have one floor and this does not drain anything through the smaller connection.
If you do that then it no longer is legal. Much to easy for feces from your toilet to block the small pipe.
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Old 12-30-2014, 05:27 AM   #7
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Ok, so what's the best way for me to change this?
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Old 12-30-2014, 05:17 PM   #8
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Pictures are worth a thousand words. We can help if we can see what your facing.
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Old 12-30-2014, 06:14 PM   #9
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Quote:
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Ok, so what's the best way for me to change this?
what part of pa are you in...and yes pictures will help...
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Old 12-31-2014, 07:31 AM   #10
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First of all, I was wrong, it is 4" PVC.

Here is a picture of it. Heading to the left, you will see the cast iron leading to the vent. Just in front of that is the copper vent (which I assume these tie into each other somewhere) from the bathroom sink and shower (which you can see in the distance).

EDIT: I'm near Harrisburg.
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What is the correct toilet drain with dry vent upstream?-image1.jpg  

Last edited by awsnap; 12-31-2014 at 07:32 AM. Reason: location
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Old 12-31-2014, 05:40 PM   #11
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That is some truly amazing imaginative non plumbing work there.

In Ohio you would be gutting that plumbing system out.
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Old 12-31-2014, 06:30 PM   #12
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replace the heel 90 with a combo. this combination was legal in the 20s and 30s also correct your trassions with the proper fittings.
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Last edited by Javiles; 12-31-2014 at 06:32 PM.
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Old 01-02-2015, 01:24 PM   #13
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Installed with this orientation correct? (With the vent coming in from the right side branch in the picture)

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Old 01-02-2015, 03:05 PM   #14
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The problem you have is today dry flat vents are not legal. By changing the plumbing to new you are required to vent by today's code.
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Old 01-02-2015, 03:50 PM   #15
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Quote:
Originally Posted by awsnap View Post
I currently have a toilet drain that drops below the joist space and I would like to get it within that space. Why wouldn't I?!
I don't see an easy way without the ceiling being opened or at least know the joist layout and the distance to the stack(vertical pipe)
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