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Old 02-21-2009, 01:58 PM   #1
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Drain for a toilet


I am installing a toilet in the basement. If possible I would like to avoid breaking open the concrete floor to connect the drain to the stack. How much room do I need under the subfloor to accommodate the closet elbow and the slope? The distance to the stack is about 2 feet.

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Old 02-22-2009, 05:03 PM   #2
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Drain for a toilet


As for the slope it needs a min of 1/8" per foot so thats a 1/4" for 2 foot. And for the clerance under the subfloor. If you use a regular toilet flang and a reg elbow you are looking about 8" from the bottom of the subfloor to the bottom of the elbow

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Old 02-22-2009, 11:36 PM   #3
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Drain for a toilet


Don't forget to add in any amount you need for cutting the stack and installing a tee.
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Old 02-23-2009, 12:00 AM   #4
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Drain for a toilet


crack the floor,it isnt all that much harder and makes it "right"
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Old 02-24-2009, 07:51 PM   #5
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Drain for a toilet


in most ares you cannot do what your are doing for code reasons. this needs to be on its own drain and vented properly. if you connect to the stack you are now wet venting that bathroom and like i said most ares dont like this method but if you are not getting inspections then this may not be an issue. but it may come up if you sell the house and a good inspector may catch this. some areas let you use an air attmitance valve and this would work for your vent. if you dont vent these fixtures they may not work properly. overall i would break the floor open and do this right.
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Old 02-24-2009, 10:21 PM   #6
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Drain for a toilet


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Originally Posted by plumbbum0203 View Post
in most ares you cannot do what your are doing for code reasons. this needs to be on its own drain and vented properly. if you connect to the stack you are now wet venting that bathroom and like i said most ares dont like this method but if you are not getting inspections then this may not be an issue. but it may come up if you sell the house and a good inspector may catch this. some areas let you use an air attmitance valve and this would work for your vent. if you dont vent these fixtures they may not work properly. overall i would break the floor open and do this right.
First I would like to know how this is wet vented if the toilet goes directly to the soil stack that is more likey the same as the stack vent and only going 2'ft

Wet vent is used where a lav is drained to a T and flows waste down stream toa branch waste and upstream is vented to a common vent or vent stack
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Old 02-24-2009, 10:54 PM   #7
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Drain for a toilet


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First I would like to know how this is wet vented if the toilet goes directly to the soil stack that is more likey the same as the stack vent and only going 2'ft

Wet vent is used where a lav is drained to a T and flows waste down stream toa branch waste and upstream is vented to a common vent or vent stack

Yes But this would also be considered wet venting since you would be dumping water on the vent for the toilet that is now installed in the basement, on the what i guess from his post here would be the main stack for other fixtures in the house. this is a picture of a wet vent here just replace the tub with a toilet and the sink would be a fixture from above this shows how this would be wet vented. im just saying some codes may frown on this method of venting and anyway most codes dont even allow connections like this. he would be better off breaking the floor installing a wye and running a new drain and vent for this bathroom.
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Old 02-24-2009, 11:23 PM   #8
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Yes But this would also be considered wet venting since you would be dumping water on the vent for the toilet that is now installed in the basement, on the what i guess from his post here would be the main stack for other fixtures in the house. this is a picture of a wet vent here just replace the tub with a toilet and the sink would be a fixture from above this shows how this would be wet vented. im just saying some codes may frown on this method of venting and anyway most codes dont even allow connections like this. he would be better off breaking the floor installing a wye and running a new drain and vent for this bathroom.
Your pic is showing on the same floor and we don't know if there is a sink above the proposed toilet connection. Reguardless. If a 3" run horz to the soil stack, then the 3" pipe is rated at 30 dfu and depending on the toilet it is rated at 3-6 dfu. Since the toilet refills the trap on the flush cycle a vent for the toilet is not required. However if a lav or sink drain was connected to the 3" going to the soil stack then it would need a vent connection and such vent shall rise 6" above the highest flood level rim
So as long as ONLY the toilet is connected to this horz connection I would say he shouldn't have a problem

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