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Author:
DIYrMaker (Non-US)
Hello,
I know there has been great debate here about the pros and cons of AAVs on this site. I am not a plumber, but have a lot of DIY experience and I don’t mind researching and learning before getting my hands dirty.
I live in Southern Ontario, near Michigan border ( i.e., cold winter). My problem is I want to build a bathroom in my basement this winter and I do not want to run a vent out of my roof until the Spring. I will be getting a new roof then and will have more access to proper locations, etc. I don’t want o try to mess around with lifting old shingles, installing flashings, etc. until this new roof is installed. I don’t care about roof aesthetics, I just want to avoid leaks.
My plan is to use a temporary AAV (Oatey SURE-VENT 20 DFU) mounted in a wall box. I would rough in the atmospheric vent piping (either through an interior wall or boxed-in a hall closet) and cap it until I can make the connection in the Spring.
The bathroom is 5 feet by 9 feet and will have a toilet, vanity, and shower stall. It is located at the front corner of the house, right where the main pipe exits the house. It is basically sitting right on top of the main pipe. The main stack is located approximately 40 feet away. I do not have any other vent pipes that are accessible without major renovation.
Click Here to View Diagram: [drive.google.com]
My questions:
1. Does the plumbing and vent location look right?
2. Would the toilet vent properly?
3. Do I need another AAV on the shower?
4. Any other comments, or things to consider?
Your ideas, experiences and knowledge is very welcome.
Thanks!
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Author:
KCRoto (MO)
I would personally go for it if it was my house, I understand the concern with adding the roof penetration at this time and would do the same. I would change the sink drain so that the wall outlet is vertically oriented and has a separate waste and vent line. I wouldn't make this my primary bathroom until the vent is attached and the walls finished. The way you have it set up you can at least do a sheet of rock on the bottom and finish up the top half of the wall later. Make sure to use nail strike plates over your electrical and plumbing lines in the walls.
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Author:
North Carolina Plumber (NC)
The wye for the sink + vent needs to be in the pipe just downstream of the toilet, before it ties into the main.
The shower trap will also need to be vented.
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Author:
DIYrMaker (Non-US)
Thank you very much KcRoto and NC for your quick reponses.
Please see this diagram that more acurately displays what I am trying to do.
[drive.google.com]
KCroto - Is this what you mean by "vertical wall outlet".
New questions:
1. Would one 20 DFU be enough to vent all three fixtures if it was layed out as in the diagram?
2. If the sink was closer to the toilet (mine will be right beside it), would the sink vent suffice to vent both the toilet and the sink?
3. Is it better to use this plumbing approach (i.e., a seperate "circuit"), instead of running everything directly off the main line (as shown in the diagram in my original post)?
Thanks again. I love this site. A lot of great info here!
Edited 1 times.
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Author:
bernabeu (SC)
looks good - AAV is TEMPORARY until spring
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
KCRoto (MO)
yes on the lav, but toilets require a 2" minimum vent regardless of the drainage fixture units.
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