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Old 12-30-2014, 10:01 AM   #1
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Venting drain for shower and bath


I seem to have a problem here, I am remodeling a basement bathroom, house was built in 1929, washington state, it has a 4" stack that ties to the existing toilet and sink and shower line but I understand that it is not enough venting. Only had an issue once in the past with shower not draining and liquid plumber fixed it. Unfortunately it looks like I am working with just a 1 1/2" line instead of the required 2" for shower. I want to add a tub to the room and move the shower a bit but pipes are under concrete. If I extend shower I wont have room to add a vent pipe alongside the drain without it sticking out of the floor. Wondering how venting works, if I would need to make a new hole in the roof, I have heard of something called a gulp valve that may work? I have some pictures of the room and my sketch of where I wanted things to go but have lots of wiggle room for design still.

Thank you for your time.
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Venting drain for shower and bath-doublewye.jpg   Venting drain for shower and bath-other-perspect.jpg   Venting drain for shower and bath-bathdiagram.jpg   Venting drain for shower and bath-bathcle.jpg   Venting drain for shower and bath-bathtext.jpg  


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Old 12-30-2014, 10:10 PM   #2
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Venting drain for shower and bath


try this need 2" pipe use divider wall for vent AAV or VTR
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Old 12-31-2014, 12:24 AM   #3
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Venting drain for shower and bath


ooh AAV! That looks promising, do I need to tie that in before the wye or after? the small red section there in front of the toilet is where the current drain pipe is, the longer red on the left is where I was going to run the drain to tie into the tub and then there is the other "arm" of the Y that would not color red for some reason lol, that was the line going to the shower. Are you suggesting like a sanitary T on the ends of those lines(tub and bath) before their P traps and then run them in the wall? Im not sure what that long black line you drew next to the toilet is, theres no drain there, drain goes right under toilet and a few feet behind the toilet is the 4" stack.

Thank you for the AAV idea!
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Old 12-31-2014, 06:51 PM   #4
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Venting drain for shower and bath


Steve what he is drawing shows you that you will need to open the floor all the way to your stack. Then Add a Wye to your shower and tub then your toilet.

Flow of water toilet through wye to old existing pipe.

And lucky you this even makes your entire bath legal to code.
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Old 12-31-2014, 07:24 PM   #5
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Steve what he is drawing shows you that you will need to open the floor all the way to your stack. Then Add a Wye to your shower and tub then your toilet.

Flow of water toilet through wye to old existing pipe.

And lucky you this even makes your entire bath legal to code.
I believe what he was looking for was venting the shower and tub i gave an example of how he could raise a vent for the two where he taps into is another question he can connect downstream of the toilet depending what's behind the toilet.
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Old 12-31-2014, 10:41 PM   #6
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Venting drain for shower and bath


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I believe what he was looking for was venting the shower and tub i gave an example of how he could raise a vent for the two where he taps into is another question he can connect downstream of the toilet depending what's behind the toilet.
Maximum 1.5" trap arm length per UPC is 42". So the AAV needs to no further than 42" from the tubs trap weir.
Since you are including a shower you have also exceeded the maximum drainage fixture units for 1.5" horizontal drains. You need to increase to 2" to serve both of those fixtures.
The 1.5" line is too small....
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Old 01-01-2015, 01:36 AM   #7
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Venting drain for shower and bath


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try this need 2" pipe use divider wall for vent AAV or VTR

IPC 8 ft on 2 inch line.
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Old 01-01-2015, 10:02 AM   #8
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Boy Javiles that must be a millionaire bath your building there. :}
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Old 01-01-2015, 10:54 AM   #9
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Boy Javiles that must be a millionaire bath your building there. :}
you'd be surprised the things rich folks come up with for there bathrooms and the money they spend.
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Old 01-01-2015, 12:46 PM   #10
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Not at all inspected multi million dollar houses a lot of times.
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Old 01-08-2015, 09:21 PM   #11
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Venting drain for shower and bath


I know it would not be to code so I dont know if you guys will even comment on this but in your opinion do you think this would work/function - putting a T of some sort on the line going to the shower right where it goes under that divider wall and running vertical line right up into the divider wall to AAV? Is there a preference to which side the AAV goes - bath tub vs shower? We are not wealthy and would probably sooner give up on the plan before tearing up the whole floor and adding a 2nd line and wye to the stack or replacing the existing 1.5 with a 2". Basically not going to tear up anything else any further down the line towards that toilet.
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Old 01-08-2015, 09:46 PM   #12
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Venting drain for shower and bath


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Originally Posted by stevetyler View Post
I know it would not be to code so I dont know if you guys will even comment on this but in your opinion do you think this would work/function - putting a T of some sort on the line going to the shower right where it goes under that divider wall and running vertical line right up into the divider wall to AAV? Is there a preference to which side the AAV goes - bath tub vs shower? We are not wealthy and would probably sooner give up on the plan before tearing up the whole floor and adding a 2nd line and wye to the stack or replacing the existing 1.5 with a 2". Basically not going to tear up anything else any further down the line towards that toilet.
Running DWV piping is not expensive if you do it yourself.
Cement is inexpensive as are plastic piping and parts.
I never wanted to get down there but after I did it, not a big deal.
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Old 01-08-2015, 10:21 PM   #13
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Venting drain for shower and bath


again depending on what you have downstream of your toilet this set up is perfectly legal. raise your vent stack in the divider partition in the shower pick up your tub and shower as shown in the drawing. make the AAV accessible to replace if needed you can run up to 8 feet of 2 inch pipe for your shower and tub. your tub and shower are properly vented at this point vent through the roof would be best if possible. clean out at the base of the vent stack.
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Old 01-08-2015, 10:29 PM   #14
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Venting drain for shower and bath


Your AAV must have access they fail. And it must have a fresh air inlet. Register cover will work.

917.5 Access and ventilation. Access shall be provided to all air admittance valves. The valve shall be located within a ventilated space that allows air to enter the valve.

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Old 01-08-2015, 10:30 PM   #15
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Venting drain for shower and bath


get creative using the same principle of drainage shown.
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