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Unread 08-07-2010, 11:02 AM   #1
custombuilt
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Plumbing

I've got a half bath in basement with stool and vanity, I am wanting to nock a wall out and build a walk in shower, I was think I could tie the 2" drain into the stool's line which is only about 5 feet away... is this ok or would I need to vent it?
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Unread 08-07-2010, 11:10 AM   #2
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Hi Jason,
With a 2" drain, I would vent it. A 3.5" or 4" main drain can easily suck your shower trap dry.

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Unread 08-07-2010, 11:14 AM   #3
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well this isn't the main stack i'm tying into its the toilet, its a finished basement and there isnt access to the main.

So I guess I could vent it into the wall where the sink vent is.?
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Unread 08-07-2010, 11:31 AM   #4
Brian in San Diego
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You definitely need to vent the shower drain prior to entering the toilet line.
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Unread 08-07-2010, 11:32 AM   #5
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My plumber has tied a shower drain into the toilet set up before, and called it a "wet vent". It sticks in my mind that there is a max distance away from the drain that you can do this. I think its right around 5', but double check that my recollection is right. I've got to talk to him today and I'll bring up your project and see if he has any good info.
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Unread 08-07-2010, 12:11 PM   #6
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Went venting is allowed in many cases, as Brannigan said, but a toilet upstream from a shower can siphon it's trap if it's not vented. I'd run a vent up the wall and tie it into the sink vent. Even if the sink vent is undersized for the additional shower, it's still better than wet venting in this case IMO.
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Unread 08-07-2010, 12:35 PM   #7
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Jason, I have a similar situation in my basement. I did not vent the shower and I should have. I'd throw pics of the bathroom up here but they belong in the worst tile thread anyway, the toilet empties out the shower trap.

I have a shower line tied into the 3" . total distance apart is about 4'. Use a vent, you won't regret it.
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Unread 08-07-2010, 01:20 PM   #8
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Ok Jason, I just saw my plumber Frank and he told me to stay in my lane, and that there's a reason I hire him

He said you should come up at least 42" in the wall and tie into the vent for the lav.

He said he'd be happy to walk you through what needs to be done for the drain. I'll PM you his number if you want to talk with him or have questions.
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Last edited by Deckert; 08-07-2010 at 01:28 PM.
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Unread 08-07-2010, 04:42 PM   #9
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In my fair city the code is 3 feet, but in my book its always a good idea to vent the shower on its own. Them new fancy fandangled terlits have greater suction than the old 3000 gallons a flush models.
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Unread 08-07-2010, 08:03 PM   #10
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"code is 3 feet"

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Unread 08-07-2010, 09:22 PM   #11
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Or maybe you could put an inline vent in.
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Unread 08-07-2010, 09:43 PM   #12
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Here in California the length of the trap arm depends on the size of the pipe. A 1 1/2" pipe can have a trap arm of 3' 6".
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Unread 08-09-2010, 03:30 PM   #13
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the length of the trap arm always depends on the pipe diameter. it is based on the idea that as soon as the top of the insde of the pipe drops below the plane of the trap 'weir' (the point where water starts to spill over) an S-trap condition is created. since the assumed slope is always 1/4" per foot the trap arm length can increase with pipe diameter.

check your local code. there should be a chart indicating fixure trap arm lengths.
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Unread 08-09-2010, 09:10 PM   #14
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there is no local code here! LOL This job is way out in the country so code is not an issue, but rather function. I am going to build a nice 3k kerdi shower in there so it needs to drain right.

I have a plumber friend taking a look at it tommorrow. He thought I should be able to vent up through the sink wall though so we will see.
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Unread 08-10-2010, 06:52 AM   #15
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Jason:

You're in Illinois now right? Illinois has it's own plumbing code and unlike some of the national codes, everything must be vented.
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