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Old 01-15-2014, 07:27 AM   #1
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Venting toilet and shower under slab


Hi All,

I need some advice on how to vent both the toilet and shower drain under the concrete slab.

Coming off the main stack, I had planned to use a Sanitary Tee. Correct?

Picture 1:
Attaching a vent to both the toilet and shower drain. The distance between the drains will be about 6 feet.

Picture 2:
Attaching a vent to the half way point between the 2.

Which one would be accurate and/or the best route?

Thanks!
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Old 01-15-2014, 09:39 AM   #2
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Venting toilet and shower under slab


The way you have those drawn would not pass code here. I don't know what version of the plumbing code you go by. We use a modified version of the UPC here.

We have to intersect a wall before the fixture, not after, and the vent has to come off vertically. (45* or greater)


Actually come to think of it they will allow us to do a horizontal wet vent now(what you've drawn isn't by any means a horizontal wet vent), but I've yet to come across a situation where a conventionally plumbed bathroom wasn't possible.

Are you building a wall against the concrete?

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Old 01-15-2014, 10:39 AM   #3
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Venting toilet and shower under slab


Thanks for replying Alan.

We are using the 2009 version of the NPC.

Yes, I will be framing all of that in and covering with drywall. What do I need to change in order to make this compliant?

Thanks for your time
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Old 01-15-2014, 11:07 AM   #4
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Venting toilet and shower under slab


Here are some examples of toilet venting. Note how all of the vents are coming off the vertical or 45degrees thereof. SInce you are in a basement slab, the most likely ones that would work for you are the middle ones due to depth issues.
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Old 01-15-2014, 11:14 AM   #5
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Venting toilet and shower under slab


Here shows a shower being vented off a vertical takeoff and the toilet, not shown, being wet vented off of what will be the lav sink
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Old 01-15-2014, 11:16 AM   #6
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This is another view of the above photo. This one shows the toilet being wet vented off of what will be the lav sink
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Old 01-15-2014, 11:33 AM   #7
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Venting toilet and shower under slab


I am also in the process of planning a basement bath group in an unfinished basement. The above 2 photos are not mine but I am using them for planning reference. You may have to adjust your layout to accommodate. Post back when you get your final rough-in.
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Old 01-15-2014, 11:47 AM   #8
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Interesting... The vent to these drains would be horizontal for a few feet. I have no way to come straight down then 45 into the line. Is there a max length a vent can be horizontal?
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Old 01-15-2014, 01:29 PM   #9
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Quote:
Originally Posted by Trucon01 View Post
Interesting... The vent to these drains would be horizontal for a few feet. I have no way to come straight down then 45 into the line. Is there a max length a vent can be horizontal?
There are maximum total distances(including vertical & horizontal) for vent piping depending on the vent pipe's diameter./

I believe 1-1/2" is 60 ft, 2" max length is 120 ft, and 3" is 180 ft.

If you have no other choice but to run horizontal on the vent take off and you dont mind having a violation, then put a cleanout on the vent line that you can get to just in case the horizontal part clogs
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Old 01-15-2014, 01:51 PM   #10
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It won't be exactly horizontal, there will def be a decent pitch on the vent because this pipe will be fairly deep.

Its going to function fine with 1 vent for both fixtures?

Thanks for taking the time to mock that up!
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Old 01-15-2014, 02:16 PM   #11
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Venting toilet and shower under slab


Don't you have shower partitions to bring the vents up in? Then overhead, connect to the existing vent
Also the shower needs a trap arm and trap

In the first post you mentioned a San tee. They can only go in the vertical position
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Old 01-15-2014, 02:21 PM   #12
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In the first post you mentioned a San tee. They can only go in the vertical position
The San-T he mentioned was to go on the existing stack in the photo to pick up the vent. Hopefully he has no other fixtures draining into that stack above the tie-in for the basement vent.

It can be a vent tee.
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Old 01-15-2014, 03:14 PM   #13
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Venting toilet and shower under slab


The stack does have other fixtures above draining into it. 2 sinks and 2 toilets. What type of fitting can I use on that stack to use it as a vent if a San Tee won't do?
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Old 01-15-2014, 03:57 PM   #14
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Venting toilet and shower under slab


You cant use a drainage stack to tie in a vent. Period.
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Old 01-15-2014, 06:27 PM   #15
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Venting toilet and shower under slab


No dry flat vent is allowed under the IPC clean out or not. Also you need to can the pvc tee on your ABS pipe. They are not the same plastic and not made to glue together.

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