Venting new basement plumbing

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Old 03-29-11, 09:02 AM
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Venting new basement plumbing

I am laying out some plumbing in my basement for a new sink and repositioned washing machine standpipe. At issue is whether or not this setup (see link to image below) has adequate venting. There are several feasable ways I could set this up, but this would be the easiest.

Would anyone be willing to comment if they have concerns with the layout? Thanks.

See the layout at this address (replace "[DOT]" with "."):
http://i1085.photobucket[DOT]com/albums/j421/twcarlson/BasementPlumbing.jpg
 

Last edited by twcarlson; 03-29-11 at 10:04 AM.
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Old 03-29-11, 09:25 AM
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Your pic did not show. Post to a place like photobucket free and post link back here.

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Old 03-29-11, 10:03 AM
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http://i1085.photobucket[DOT]com/albums/j421/twcarlson/BasementPlumbing.jpg
 
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Old 03-29-11, 10:19 AM
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Link

I tried to fix your link but it didn't work. The URL may be bad.
 
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Old 03-29-11, 10:26 AM
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http://i1085.photobucket.com/albums/...ntPlumbing.jpg

That will work. Only if AAV are allowed in your area, and the AAV needs to be exposed.

Mike NJ
 

Last edited by lawrosa; 03-29-11 at 10:49 AM.
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Old 03-29-11, 12:07 PM
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Thanks for your analysis. Does anyone else disagree?

Two follow-up issues:

1. Even easier would be to use the kitchen sink drain from above as a wet vent for the basement utility sink and washer. I assumed I could not do that because the wet vent comes from a different floor. Am I correct in my thinking there?

2. When the first floor sink is drained (especially a large quantity all at once), would there be any problems with positive pressure in the line potentially blowing out the traps below? This idea occurred to me because the AAV only allows one-way airflow, and so could allow pressure to build in that case.

Thanks.

(Sorry about the problems with my image. I could not get the URL to show in the final post; it was replaced with asterisks.)
 
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Old 03-29-11, 02:13 PM
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I assumed I could not do that because the wet vent
You cant wet vent anymore. Been 20 yrs or so.

would there be any problems with positive pressure in the line potentially blowing out the traps below?
It should not be an issue.


Mike NJ
 
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Old 03-29-11, 03:57 PM
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Originally Posted by lawrosa View Post
You cant wet vent anymore. Been 20 yrs or so.



It should not be an issue.


Mike NJ
I think you are a little wrong on your statement on wet vents, the UPC states this:

908.1.1 Where Permitted. Wet venting is limited
to vertical drainage piping receiving the
discharge from the trap arm of one (1) and two (2)
fixture unit fixtures that also serves as a vent not
exceeding four (4) fixtures. Wet-vented fixtures
shall be within the same story; provided, further,
that fixtures with a continuous vent discharging
into a wet vent shall be within the same story as
the wet-vented fixtures. No wet vent shall exceed
six (6) feet (1,829 mm) in developed length.
 
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Old 03-29-11, 04:26 PM
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Wet-vented fixtures shall be within the same story; provided, further, that fixtures with a continuous vent discharging into a wet vent shall be within the same story as the wet-vented fixtures.
Of course.... Its done all the time. Toilet vent, lav and bath drain into that.

Seperate floor venting used to be allowed 20 years ago as the OP described. I thought it was common knowledge when talking wet vent, that this was the meaning. I should be more clear.


The ' It should not be an issue" statement was regarding the OP thinking the flow of water will clear the traps, even with the AAV.

Sorry.

Mike NJ
 
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Old 03-29-11, 07:24 PM
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As a side note, will the OP have an issue with the way the tee to the laundry sink is on it's side? It looks to me like the water draining from the washer will back-fill into the laundry trap. If I recall correctly, the tee should face upward, and then you'd use an elbow to come out of the wall.

Thoughts?
 
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Old 03-30-11, 06:40 AM
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Thanks for your observations Zorfdt.

First: If I make the tee vertical, I don't think the sink will be vented properly; the sink's horizontal trap arm will drop down several inches before hitting vent air, and several inches could be enough to siphon out the trap. Is that right?

Second: The fitting is a long sweep tee-wye (a.k.a. combination wye-45), not a tee or sanitary tee, and it sweeps toward the direction I want it to go. As I understand, this fitting is to be used on horizontal runs to direct the water -- to keep washer water out of the sink pipe, and sink water out of the washer pipe. Is this the correct application?
 
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Old 03-30-11, 07:00 AM
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That Y is fine on the horizontal.

Mike NJ
 
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Old 03-30-11, 07:03 PM
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Mike - thanks for the clarification. I still get easily stumped when it comes to DWV design.
 
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