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Old 10-20-2013, 02:21 AM   #1
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Laundry room plumbing


I am working on the DWV plumbing for a new laundry room in my basement. I think I have it figured out but just want to check if what I am doing seems reasonable. I am a plumbing novice, so any advice would be appreciated.

In the attached schematic the 1-1/2" vent line and the 1-1/2" drain line that go vertical are already existing as well as the 2" line that goes down into the slab. I would be modifying everything else to what is shown in the drawing.

Once concern I have is whether my venting is adequate for the number of fixtures.
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File Type: pdf drainage_schematic_2.pdf (81.8 KB, 60 views)

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Old 10-20-2013, 03:49 AM   #2
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only flaw is the connection to the dog wash---that is a trapped fixture and should join the system after the trap for the washing machine---

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Old 10-20-2013, 06:53 AM   #3
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You show draining to a sump pump? Where is the ultimate disposal point? You cannot drain these fixtures to other than sewer or septic system.
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Old 10-20-2013, 10:01 AM   #4
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You show draining to a sump pump? Where is the ultimate disposal point? You cannot drain these fixtures to other than sewer or septic system.
The sump pump directs to sanitary sewer system.
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Old 10-20-2013, 10:12 AM   #5
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only flaw is the connection to the dog wash---that is a trapped fixture and should join the system after the trap for the washing machine---
Thanks Oh'mike. Any suggestion on where it should join the system? Or would it be acceptable to make it an un-trapped fixture going into the washer stack?

I could take it back to the sanitary tee for the vent on the washer trap arm (I would have to replace the sani-tee with a long sweep 90) but I think I would have trouble getting back to the vertical drain line that comes from upstairs.
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Old 10-20-2013, 10:43 AM   #6
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You also have 2 story wet vent- upper floor drain stack can not be vents for lower floor fixtures.

Do you know what code your inspector uses?
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Old 10-20-2013, 11:25 AM   #7
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You also have 2 story wet vent- upper floor drain stack can not be vents for lower floor fixtures.

Do you know what code your inspector uses?
Thanks TheEplumber, I appreciate the reply.

I believe it is the Uniform Plumbing Code, but I don't know what version. I can't seem to find that info on their website.

I am not sure what you mean by the 2-story wet vent. The drain line from the sink on the upper floor is not acting as a vent (I don't think). It is vented by the 1-1/2" vent that extends vertically from the top of the 2" line that goes under the slab.
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Old 10-20-2013, 02:02 PM   #8
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Thanks TheEplumber, I appreciate the reply.

I believe it is the Uniform Plumbing Code, but I don't know what version. I can't seem to find that info on their website.

I am not sure what you mean by the 2-story wet vent. The drain line from the sink on the upper floor is not acting as a vent (I don't think). It is vented by the 1-1/2" vent that extends vertically from the top of the 2" line that goes under the slab.
The center riser has a trap arm to serve a lower floor sink, it is also serving an upper floor sink. Therefor, the lower sink is wet vented illegally- it won't pass inspection.
Move that tee to the left vert. pipe and increase it's size to 2"- the vent section can remain 1.5". Also replace the horz. san tee to a combination wye/45.
How will you solve the dog drain?
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Old 10-20-2013, 02:56 PM   #9
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The center riser has a trap arm to serve a lower floor sink, it is also serving an upper floor sink. Therefor, the lower sink is wet vented illegally- it won't pass inspection.
Move that tee to the left vert. pipe and increase it's size to 2"- the vent section can remain 1.5". Also replace the horz. san tee to a combination wye/45.
How will you solve the dog drain?
Okay, I think I understand. Without a proper vent the lower sink draining could pull the water out of the trap from the upper sink. I think I made the revisions you suggested, moving the trap arm connection for the lower sink to the riser on the left.

Could I also solve that by connecting that riser to the vent line that I currently show passing behind the drain line?

To solve the dog wash connection (which I upsized to 2" based on some research) I attached a new vent tee between the dog wash trap and the washer stack. I still wonder if this could be plumbed as an un-trapped fixture, but it is not a big deal to install the trap and vent.

I attached a revised drawing showing the changes, take a look and let me know what you think.

Thanks.
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File Type: pdf Drainage schematic_3.pdf (90.2 KB, 24 views)
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Old 10-20-2013, 05:38 PM   #10
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you still show the dog wash entering the system before the washing machine trap---

that is not acceptable----
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Old 10-20-2013, 08:56 PM   #11
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Quote:
Originally Posted by Airportbum75 View Post
The sump pump directs to sanitary sewer system.
As you now describe the pump, it is an ejector pump not a sump pump.
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Old 10-20-2013, 10:35 PM   #12
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Thank you, I wasn't sure what it was called.
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Old 10-21-2013, 09:18 PM   #13
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Thanks everybody for the tips. I thought I would take one more stab at this. The revised schematic is attached.

The washer stack now stands alone at the end of the low, 2" run. The 2" trap arm from the dog wash connects down stream of the washer on the same riser as the 1-1/2" connection from the sink in the adjacent room.

The laundry sink, coming in from the far right, now drops into the 2" drain above the low, 2" line from the left.

One question I have (shown on the drawing) is whether I need an additional vent on the trap arm for the washer stack.

The other question is whether a single 1-1/2" vent is adequate for the number of fixtures.

I am in Spokane County, WA if that helps for code compliance purposes.
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File Type: pdf Drainage schematic_4.pdf (87.6 KB, 14 views)
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Old 10-21-2013, 10:04 PM   #14
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You might be overloaded on that 2 inch branch.
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Old 10-22-2013, 12:16 AM   #15
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You might be overloaded on that 2 inch branch.
After doing some research on DFUs it looks like you might be right. I think I am limited to 6 on the horizontal 2" branch. So I moved the upstairs 1-1/2" sink drain to a sanitary tee that ties into the vertical 2" stack. Better?
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File Type: pdf Drainage schematic_5.pdf (91.0 KB, 16 views)

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