Check my PVC connections

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OneStaple

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I'm redoing some plumbing and want to make sure I'm using the right connections. The previous installation did not have the right ones.

See the attached picture. There will be a washing machine and lavatory on a 2" line on the left, and a single lavatory on the right, all connecting at a drain/vent line (2" down, 1.5" up).

1. At the spot marked A in the diagram, I need to use a wye with a 1/8" bend or combo wye, correct? And not a sanitary tee?
2. At the spot marked B in the diagram, a double fixture tee is the correct piece, right? I know that would be correct for two lavs, but want to make sure the inclusion of the washing machine doesn't change anything.

Thanks!
Tyler

Plumbing.jpg
 

Lukewalker64

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Are you under UPC or IPC?

1. Agree that A should be a combo or a wye with 45.

2. Consider stacking santees instead of the double fixture fitting, since you have the washing machine combining with the lav.

3. Can you add a vent for the washing machine trap? As shown below in blue.
 

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OneStaple

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I'm in Virginia, so I believe we're under IPC.

1. Great
2 and 3. Whoever installed this originally compromised 5 studs in a row by cutting holes too big. I'm trying to reinforce them, but am not terribly eager to put more big holes in them, if possible. So if I need to stack santees or run an extra vent, I'll figure out how to do it. But I'd love to avoid the extra runs.

The distance from the washer p-trap to the vertical line is only about 32".

Alternately, I can come straight out of the wall for the left lav right at point B where the double fixture tee would be (it would only be about 4" off-center from the lav). Is there a connector that would allow me to do that, and would it be better? Something like a triple fixture tee?

Tyler
 

Lukewalker64

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You can buy stud shoes at the big box store to reinforce the compromised studs. It doesn't fully replace all the strength of the drilled stud, but does help. Simpson makes heavy duty shoes that add extra strength.

IPC 911.1 limits a common vent to two trapped fixtures (e.g., the two lavs). You could join the added washer vent in an attic or in the joists of the floor above, if you want to avoid drilling horizontally through more wall studs.
 

OneStaple

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Ok, thanks for the info. So, if I add a vent to the washer line, connecting to the other vent as you drew (at least 6" above the flood rim), whether in the attic or higher in the wall, I should be good? And the double fixture connection at point B is ok?

Thanks for the advise on stud shoes. I already have some of the heavy duty stud shoes to put on. Some of the studs have only 1/2" of material left at the back of the (single, not doubled) stud. Definitely needs fixing.

Thanks,
Tyler
 
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