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Old 03-11-2018, 05:12 PM   #1
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Proper drain vent


Will a 2" pvc dwv pipe be sufficient for a vent for a bathroom with 1 sink, 1 toilet and a shower ?
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Old 03-11-2018, 05:44 PM   #2
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Re: Proper drain vent


Depends on what code your under and where you place the vent?
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Old 03-11-2018, 06:18 PM   #3
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I believe I'm under the UPC in San Antonio Texas.
I am pretty much copying the previous existing cast-iron dwv layout and pipe size.

The vent comes out the back of a 3x3" bend with 2" low heel inlet. Which flows down to a 3x3 x2x2 double wye, where all three pipes meet. The shower originally had its own inch and a half vent pipe. But I wanted to know if I can tie it into the main 2" ? I provided a couple of photos, please excuse the crudeness.. Thanks !
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Old 03-11-2018, 06:54 PM   #4
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Re: Proper drain vent


Not in your current lay out. I believe the toilet must be the first fixture when horizontal wet venting. You can confirm that with your inspector.

I do know that in my area (UPC), double wyes are not approved in the horizontal though.
With the layout you have now, replace the dbl. y with two 3x2 wyes. and vent the shower as you did the toilet. Then tie the 3 vents together in the wall @ 42" off the floor. Take one 2" vent through the roof.
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