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02-11-2013, 01:46 PM
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#1
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Newbie
Join Date: Feb 2013
Posts: 12
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Basement bathroom venting question
I bought a house new in 2004. The basement was plummed for a future bathroom. There is a 2" bath drain pipe coming out of the slab in a square tub box, a larger drain out of the slab for the toilet, and there is a drain coming down the wall from the upstairs plumming for the sink. It has a capped off "T" split to tie into. My question is, how can i tell if the tub and toilet are tied into a vent? If I tie the sink into the T split from the upstairs plumming, can i assume the sink will have proper ventilation? Am I going to have to tear up the concrete to vent the toilet and bath? It seems like the builder would have done this before pouring the concrete however I cant ask them because they went out of business of course!
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02-11-2013, 01:54 PM
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#2
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Member
Join Date: Oct 2011
Location: Ohio
Posts: 2,106
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Basement bathroom venting question
Quote:
Originally Posted by Jpaulson12
and there is a drain coming down the wall from the upstairs plumming for the sink. It has a capped off "T" split to tie into. My question is, how can i tell if the tub and toilet are tied into a vent
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If there are any fixtures on upper floors draining into this " drain coming down the wall " then you cannot vent the basment bathroom group by tieing into this drain. Unless of course you were to tie in above the flood level of the highest fixture that ties into that stack.
Like in the photo below. As long as there are no fixtures draining into that stack above fitting #5, it is OK to use above fitting #5 as a vent for this group. This group below is obviously a washer and utility sink.
Last edited by hammerlane; 02-11-2013 at 01:56 PM.
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02-11-2013, 02:02 PM
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#3
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Newbie
Join Date: Feb 2013
Posts: 12
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Basement bathroom venting question
That makes sense, i guess venting from that line is not an option. I dont understand why the builder wouldnt have tied these drains into a vent line. There are no other vents to tie into in the basement and I am going to have to break up the concrete to get to the toilet and tub drain...can i just make a new vent and just vent it right outside of the basement wall?
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02-11-2013, 02:08 PM
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#4
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Member
Join Date: Oct 2011
Location: Ohio
Posts: 2,106
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Basement bathroom venting question
SO the only fixture draining into this "drain coming down the wall from the upstairs" as you referred to it---- is a sink?
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02-11-2013, 02:14 PM
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#5
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Newbie
Join Date: Feb 2013
Posts: 12
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Basement bathroom venting question
It looks like it comes from the kitchen so I assume the sink and the dishwasher...could I just use air admittence valves, not taking into consideration my local code
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02-11-2013, 02:44 PM
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#6
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Newbie
Join Date: Feb 2013
Posts: 12
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Basement bathroom venting question
Upon further inspection...i beleive the 2" pipe coming down from upstairs is a drain pipe, all other drains from upstairs are draining into a larger drain pipe elsewhere in the basement. Is it logical to think the builder tied the toilet and tub into this vent beneath the slab?
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02-11-2013, 02:46 PM
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#7
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Roofmaster
Join Date: Oct 2012
Location: Maryland
Posts: 2,760
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Basement bathroom venting question
Are you sure the 2 going up isnt just a vent? Why would they rough it in without a vent. Have you run the water in the sink or scoped out the 2?
__________________
" A lot of men build things, and a lot of things fall down "
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02-11-2013, 02:46 PM
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#8
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call me E
Join Date: Jul 2010
Location: Idaho
Posts: 3,877
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Basement bathroom venting question
What size is the the pipe from above?
Uncap the tee and run water upstairs. If you don't see any water coming down the pipe then it may be the vent for your basement fixtures- it may be revented upstairs already.
A picture of your layout would help.
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When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
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02-11-2013, 03:03 PM
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#9
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Newbie
Join Date: Feb 2013
Posts: 12
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Basement bathroom venting question
Uncapped, no water! It is a 1.5", at the T it then is a 2 inch that goes into the slab....there is also a junction near the slab with a cap...is that to tie a sink drain into? I attched a pic! Thanks for your help!
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02-11-2013, 03:15 PM
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#10
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call me E
Join Date: Jul 2010
Location: Idaho
Posts: 3,877
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Basement bathroom venting question
The capped outlet is your bathroom sink. The tee at the base is a clean out.
If this was in my area, I'd be looking for another vent pipe in the floor.
A toilet should be vented with 2". What you pictured is 1.5"
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When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
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02-11-2013, 03:18 PM
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#11
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Newbie
Join Date: Feb 2013
Posts: 12
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Basement bathroom venting question
Hmm...i looked and there is no other pipe coming up...is it possible they tied the toilet and tub into the 1.5" vent?
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02-11-2013, 03:21 PM
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#12
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call me E
Join Date: Jul 2010
Location: Idaho
Posts: 3,877
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Basement bathroom venting question
Quote:
Originally Posted by Jpaulson12
Hmm...i looked and there is no other pipe coming up...is it possible they tied the toilet and tub into the 1.5" vent?
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yes, just about anything is possible 
Some areas have different ways to vent toilets.
Have you dug into the floor box to see whats down there?
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
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02-11-2013, 03:24 PM
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#13
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Newbie
Join Date: Feb 2013
Posts: 12
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Basement bathroom venting question
Not yet...will do though! This forum is great....what is the purpose for that tub box anyways? Is it just easier to move the tub drain around if needed??
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02-11-2013, 04:29 PM
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#14
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Member
Join Date: Oct 2011
Location: Ohio
Posts: 2,106
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Basement bathroom venting question
deleted
Last edited by hammerlane; 02-11-2013 at 04:32 PM.
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02-11-2013, 04:32 PM
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#15
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Member
Join Date: Oct 2011
Location: Ohio
Posts: 2,106
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Basement bathroom venting question
Quote:
Originally Posted by Jpaulson12
Uncapped, no water! It is a 1.5", at the T it then is a 2 inch that goes into the slab.
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So now you are going against what you said in the 1st, 5th and 6th post and are positive no other fixtures are draining into this??
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