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Old 10-28-2011, 09:42 PM   #16
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


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Sounds like you answered your own question with this one anyway, no need for a drawing. Just for fun, look up the definition of TRAP ARM and see what they say, even though I already know the answer.

Then based off of these definitions you should be able to size your piping accordingly.

Since there are no other drains tied in between the 3" stack and your clothes washer, the piping downstream of the vent is your fixture drain. Judging by the original excerpt from the code that you posted, that section should be allowed to be 2" To clarify, starting at the clotheswasher you have : Standpipe -> P-trap - > Trap arm -> vent -> Fixture drain -> Branch drain or stack.

Make sense?


I'd print all these sections out, and show him that you understand what you're looking at, and get his input on why he wants it to be 3". If he says it must be, then that's his call, but the way the code reads, a 2" is well within reason.
I totally agree, but what about the sink that drains into the WC vent? You now have 2 fixtures. Based on the inspectors comment, I can see the AHJ wanting the horizontal fixture drain to be 3"- though I don't agree

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Old 10-28-2011, 11:27 PM   #17
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


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I totally agree, but what about the sink that drains into the WC vent?
But he said no other fixtures drain into that stack except the floor drains in the garage.
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Old 10-28-2011, 11:40 PM   #18
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


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But he said no other fixtures drain into that stack except the floor drains in the garage.
He's talking about the laundry tray/utility sink that's wet venting the washing machine connection (labelled in the 2nd picture above).

************************************************** ***

On a side note (not that it matters in Ohio), here in MA, we're not allowed to wet vent a washing machine connection.
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Old 10-29-2011, 10:12 AM   #19
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


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He's talking about the laundry tray/utility sink that's wet venting the washing machine connection (labelled in the 2nd picture above).

************************************************** ***

On a side note (not that it matters in Ohio), here in MA, we're not allowed to wet vent a washing machine connection.
Ah, then I missed that point. In that case, i'd say he is technically correct.

I still think 2" should be plenty.
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Old 10-29-2011, 05:25 PM   #20
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


The AHJ is stopping over Tuesday morning for a "consultation". I will ask for his further explanantion of the 3" branch.

I'll post his reply.

Thanks for all comments but a quick question.


1. In all my photos I have fitting #1 listed as a (T-Wye) /(Wye with a street 45) / (Combo an 1/8). My understanding is that all three are the same configuration having that long sweep. Anyway could fitting #1 be a San-T instead of one of the above named fittings??

Last edited by hammerlane; 10-29-2011 at 05:33 PM.
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Old 10-31-2011, 02:08 PM   #21
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


I dont see why you couldnt use a san-tee going from horizontal to vertical
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Old 11-01-2011, 01:27 PM   #22
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


Spoke with city plumbing inspector again today. From when I spoke with him last there may have been a little confusion about what size stack the laundry tub/washer standpipe branch drain would be dumping into.

After he verified that my existing stack was 4", he said :

1)a 2" horizontal branch drain to pick up both both the laundry tub and washer standpipe would suffice since my existing stack was 4"

2)would be OK to use an AAV on the laundry tub

3)would be OK to tie into the stack with a San-Tee....no need to use the Tee-Wye.
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Old 11-01-2011, 04:22 PM   #23
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


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Spoke with city plumbing inspector again today. From when I spoke with him last there may have been a little confusion about what size stack the laundry tub/washer standpipe branch drain would be dumping into.

After he verified that my existing stack was 4", he said :

1)a 2" horizontal branch drain to pick up both both the laundry tub and washer standpipe would suffice since my existing stack was 4"

2)would be OK to use an AAV on the laundry tub

3)would be OK to tie into the stack with a San-Tee....no need to use the Tee-Wye.
That is an inspector I can work with
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Old 11-01-2011, 09:06 PM   #24
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Horizontal Washer Drain AFTER Standpipe 3 inch??????


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That is an inspector I can work with
Should have given him a hug.

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