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Old 01-31-2013, 03:58 PM   #16
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Advice on venting needed


I think that OSB is dricore.

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Old 01-31-2013, 04:04 PM   #17
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Advice on venting needed


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Originally Posted by profcolli View Post
Here is another version - not sure if this is better than post #11 (I think I got the p-trap backwards there ), but it shows the tub and lav connection together. P-trap final location will depend on tub selection, but in this general area.
Horizontal (45 at each end in post #11) over to lav replaced with a 22.5 at each end - not sure if this slope is too much.

ePlumber - can you advise and also check the 2 questions in post #11?
Refresh my memory- correct me if I'm wrong
The 2" is to serve the tub.
The 2"x1.5" y is for a lav
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Old 01-31-2013, 04:08 PM   #18
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Advice on venting needed


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Are you putting the OSB directly on the concrete?
No, those are DriCore panels with a built-in membrane providing a thermal break and drainage channels underneath the OSB
Simpled Subfloor in Basement and Vents
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Old 01-31-2013, 04:09 PM   #19
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Advice on venting needed


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Refresh my memory- correct me if I'm wrong
The 2" is to serve the tub.
The 2"x1.5" y is for a lav
Yes, exactly so. The tub will be reduced from 2" to 1.5" at the upstream end of the wye.
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Old 01-31-2013, 04:21 PM   #20
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Advice on venting needed


I added some comments on the image-
Reason for upsizing the lav line is because it's actually helping to vent the tub. The extra volume insures proper tub venting with the lav draining(wet venting)
Reason for rolling wye flatter is to get the lav line below floor- keep it graded for drainage though
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Old 01-31-2013, 04:30 PM   #21
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Advice on venting needed


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Originally Posted by TheEplumber View Post
I added some comments on the image-
Reason for upsizing the lav line is because it's actually helping to vent the tub. The extra volume insures proper tub venting with the lav draining(wet venting)
Reason for rolling wye flatter is to get the lav line below floor- keep it graded for drainage though
Thanks! Unfortunately, can't move the wye further right than this without breaking up more of the floor - the 2" pipe also crosses over the main 4" sewer line just beyond that point. I could extend to the left of the wye (before reducing) a few more inches, if that has the same effect (see pics).

If I upsize the lav will that mean 2" all the way over to the ceiling vent? Or can I put a studor vent on the lav line (see post #11). There is a 2" vent within 5 feet downstream of the tub/lav wye.

I really appreciate all your help
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Advice on venting needed-100_0001.jpg   Advice on venting needed-100_0002.jpg  

Last edited by profcolli; 01-31-2013 at 04:51 PM.
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Old 01-31-2013, 04:48 PM   #22
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Advice on venting needed


Moving the wye would just give you more room to configure the tub trap- no biggie
I assume the tub will be against the end wall so the trap will be there as well- further then where you have it positioned.
The 2"vent line can be reduced to 1.5" after the lav tee in the wall- use a 2x1.5x1.5 tee- the top will be the vent, side branch will be the lav drain, 2" down to the wye.
I'm not a fan of studer vents so I'd say to run it over, but its your call. If you use one- It must be able to intake air so don't conceal it in a wall without using a louvered, removable grill in front of it.
I added another image to help clarify the wye. Disregard that it show a toilet and extra piping. I think you get it though. If you look at the vert, venting you'll see how the lav will look with the reducing tee. Point it what ever direction suits you
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Old 01-31-2013, 05:02 PM   #23
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Advice on venting needed


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Originally Posted by TheEplumber View Post
Moving the wye would just give you more room to configure the tub trap- no biggie
I assume the tub will be against the end wall so the trap will be there as well- further then where you have it positioned.
The 2"vent line can be reduced to 1.5" after the lav tee in the wall- use a 2x1.5x1.5 tee- the top will be the vent, side branch will be the lav drain, 2" down to the wye.
I'm not a fan of studer vents so I'd say to run it over, but its your call. If you use one- It must be able to intake air so don't conceal it in a wall without using a louvered, removable grill in front of it.
I added another image to help clarify the wye. Disregard that it show a toilet and extra piping. I think you get it though. If you look at the vert, venting you'll see how the lav will look with the reducing tee. Point it what ever direction suits you
Thanks! Actually, the tub drain will be right around that point, it will be a clawfoot with a righthand drain, kneewall to hide all the plumbing, then lav on the other side. If it proves too difficult to sort out drain/overflow coming directly up from the floor, I have the option of putting the drain "through" the kneewall and then dropping into the trap in the access area that will be provided for all this plus the water pipes and faucets.
Good tip about the studor vent air grill - I would never have thought of that. I've only ever used them in "open to air" locations, but this would be behind a wall.

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