Basement Bathroom and Venting

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Old 01-04-14, 12:09 PM
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Basement Bathroom and Venting

. I am finishing my basement and planning to put in a 3/4 bath. The drain pipes were installed at the time the house was built. My issue is dealing with venting. As per code, Only one outside vent is required, and the plumbers who built my house took advantage of that. The only portion of my house that runs off an outside vent stack is my master bath (opposite end of the house from planned bathroom over 40' as a crow flys). All other plumbing in the house is vented with an AAV. I know to some this is a bad word, horrible idea, etc., etc., but this is the hand I am dealt. There is a bathroom directly above the basement bathroom, but again one AAV under the sink to vent the sink, toilet, tub/shower (I have no drainage problems, I have heard a gurgle every now and again but I can not replicate it on cue). No outside vent to tie into.
It was suggested to me to use an AAV on basement sink, and then a second one on the shower drain (vented into wall with appropriate wall vent). I am not opposed to this since without major plumbing renovation, it may be my only choice. I am trying to figure out how to correctly vent this shower so the vent stack is correctly configured with the shower drain in the floor and p trap under the concrete. Tried to upload images from my phone but it said they were too large.
 
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Old 01-04-14, 12:17 PM
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Well I would like to see pics of the piped that were originally coming up through the floor...

You can upload images to a place like photobucket and post here.. Or upload them from your computer...
 
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Old 01-04-14, 02:51 PM
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I sat 2" pipe where the drain needs to be and where it would vent
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Old 01-04-14, 03:04 PM
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OK I see the sink pipe... toilet pipe.... OK..

What in the pit???

Whats that 3" pipe in the wall for??

Last.. any pipes in the ceiling that were piped for the vent?

Can you draw how everything is hooked under the slab?
 
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Old 01-04-14, 03:16 PM
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neOK I see the sink pipe... toilet pipe.... OK..

What in the pit???
That is the drain line for the shower

Whats that 3" pipe in the wall for??
I just sat a 2" pipe in the wall next the pit for possible AAV vent location

Last.. any pipes in the ceiling that were piped for the vent?
There are pipes in the ceiling, but there are no vent pipes. All are drain. I tried to explain, the bathroom above this is vented with AAV.

Can you draw how everything is hooked under the slab?
Drain line from sink to toilet to shower, all along the back wall. Just next to osb in picture (shower wall) is a 3" stack that hooks into sewage line out of house.

Read more: http://www.doityourself.com/forum/pl...#ixzz2pTSVOJJl
 
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Old 01-04-14, 03:23 PM
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What in the pit???
That is the drain line for the shower
There are two pipes in the pit... what are they? Is there a trap?

Whats that 3" pipe in the wall for??
I just sat a 2" pipe in the wall next the pit for possible AAV vent location
Bot needed... Everthing will vent through the aav at the sink...


Can you draw how everything is hooked under the slab?
Drain line from sink to toilet to shower, all along the back wall. Just next to osb in picture (shower wall) is a 3" stack that hooks into sewage line out of house.
I need to see it on paper...LOL... If its not right I would need to offer other alternatives......
 
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Old 01-04-14, 05:02 PM
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What in the pit???
That is the drain line for the shower
There are two pipes in the pit... what are they? Is there a trap?
I just sat a 2" pipe on end to show location of where drain will be for shower




Whats that 3" pipe in the wall for??
I just sat a 2" pipe in the wall next the pit for possible AAV vent location Bot needed... Everthing will vent through the aav at the sink...
Well that would solve it all if you think it would work. Should I Install AAV under sink or in wall w/vent?



Can you draw how everything is hooked under the slab?
Drain line from sink to toilet to shower, all along the back wall. Just next to osb in picture (shower wall) is a 3" stack that hooks into sewage line out of house. I need to see it on paper...LOL... If its not right I would need to offer other alternatives......
Here is the best I could do, and remember from construction

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Old 01-04-14, 05:10 PM
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Found this pic from construction
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Could be this too, looking at pic

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Old 01-04-14, 07:37 PM
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This pic my be probable but the shower has an issue... Who added the stack on the right of the shower... ) In the wall)

And explain the two pipes in the pit???

Does not make sense....

[ATTACH=CONFIG]24110[/ATTACH]
 
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Old 01-05-14, 08:39 AM
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This pic my be probable but the shower has an issue...
I may have another configuration, looking at dirt, it doesn't look like the 3" stack crosses through "bathroom area"
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Who added the stack on the right of the shower... ) In the wall)
Again, I placed the pipe there to show if I had to add an AAV this is where I need it to go, or close to it.
And explain the two pipes in the pit???
The verticle pipe again is just placed there to show where my Shower Drain needs to be. This will not be able to change.

Both verticle pipes are there for reference. Horizantal pipe is installed. Sorry for the confusion.

Does not make sense....
I took out the pipes, here is the pic with no pipes

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Old 01-05-14, 09:57 AM
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Dont you have the original blueprint? It should show how the shower is connected..

Its all good except for the shower. The shower drain should tie into the sink arm under the slab... I see no way to do that becuase they would need to get on the other side of the 3" line thats there for the toilet...
 
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Old 01-05-14, 01:51 PM
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No blue prints. I woud have looked there. I don't think it would help, not sure the builder provided modified plans. Don't know how he got that past the city but he did. What I am providing is the best I have.

So should I be on safe side and add an aav for shower as suggested and indicated in original post. If so, suggestions on correct way to do that?

Would this work?
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Old 01-05-14, 02:37 PM
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Cant have an AAV in a wall,,,,,,,,,,,,

Id have to look up code if you can with an access panel.
 
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Old 01-05-14, 08:24 PM
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Yes, Code allows it to go into the wall as long as it has a vent for air. Studor makes a recessed wall vent just for that purpose which I planned to use.
 
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Old 01-05-14, 08:32 PM
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STUDORŪ Fire Rated AAV Recessed Box | IPS Corporation

You will need an aav under the sink too...
 
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Old 01-05-14, 10:35 PM
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As long as the AAV is 6" above the shower's waste arm it should be per UPC including if you are flat venting.
 
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Old 01-06-14, 06:35 AM
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I think you're close. You have two options for plumbing the trap and AAV.

(Mike (Lawrosa), can you confirm both of these are valid layouts? DWV still trips me up occasionally)

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Option 1 uses a 2x2x1.5" combo wye (not a sanitary tee). The vent needs only be 1.5" with a 1.5" AAV (but can be 2" if you want)

Option 2 uses a 2x2x2 wye. You can downsize the vent after that point to 1.5" if desired.
 
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Old 01-06-14, 10:44 PM
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I think Option 1 would be my best route. I will take a look at this tomorrow to be sure. Yes Lawrose, I was planning on still having one at the sink. The shower drain is over 6 ft away and I want to take any precautions now so I don't have to tear things out later to add venting.
 
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