Wet venting laundry

Old 12-06-16, 10:25 PM
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Wet venting laundry

I just joined this is my first post! This is a great forum! I have a lot of questions, here is my first one:

I am extremely confused about wet venting, so here goes my question....

Is it ok to stack 2 sanitary T's on top of each other draining a laundry sink on top sanitary T over a laundry standpipe on the lower sanitary T, with each sharing the same vertical vent? This is a vertical wet vent right? This would be a on the first floor with a 2" stack, vented to the roof with nothing on the second floor and draining underneath the floor into the main drain to my septic which would be 3 or 4". Also the laundry trap would be 2 feet from the vertical drain.

I think I am reading the code correctly that this is acceptable, but I am confused over all the comments online - many says its not code, but others say its code where they live - I live in MN and as far as I can tell its ok to vertical wet vent 2 DFU or less fixtures over the laundry (3DFU) as long as there are no more than 4 fixtures total on that wet vent and the drain is > 1 size of the 2DFU, so then 2" drain would be ok?

Old 12-07-16, 09:53 AM
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I don't think it's technically the wet vent which is the issue, but my understanding that you can't stack sanitary tees. I believe you need to use a double waste tee instead. The pros here will chime in and confirm.

You can definitely do what you need, you just need the right fittings.

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