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Old 03-11-2013, 11:18 AM   #1
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Add 2 Fixtures Existing Drain/Waste Pipe Basement


I would like to add a kitchen sink (including dishwasher) and a laundry room sink to the existing 3 washer drain pictured. Can I use a 3 tee to add the kitchen sink and a 3 Tee to add the laundry room sink?

Also how many bends can my vent line have. For example this new kitchen sink vent line is following this path:
1. Straight up Vertically from the sink 9
2. Then a 90 bend and travels 6 horizontally
3. Then another 90 going up 18 (2 stories-2nd floor & attic) to roof








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Old 03-11-2013, 11:43 AM   #2
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Add 2 Fixtures Existing Drain/Waste Pipe Basement


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Originally Posted by rickr86 View Post
I would like to add a kitchen sink (including dishwasher)
and a laundry room sink to the existing 3” washer drain pictured.


1) That picture looks like a 2" pipe (from here)
2) The issue is "drain fixture units"

Figure out what you have/want then compare that to what YOUR county requires.a sample

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Old 03-11-2013, 12:16 PM   #3
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Add 2 Fixtures Existing Drain/Waste Pipe Basement


I agree that that looks like a 2" line(2.5" OD)
If its 3"- it should handle additional fixtures- depends on what else is on the line downstream. Also, since you have that trench open- consider replacing the cast iron with plastic. It will add life to your system for not much money.
Another point- you can't use tees in horizontal drainage lines-must be wyes. And don't forget some clean outs.
Proposed venting- your ok if I understood correctly
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Old 03-12-2013, 08:13 AM   #4
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Add 2 Fixtures Existing Drain/Waste Pipe Basement


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Originally Posted by TheEplumber View Post
I agree that that looks like a 2" line(2.5" OD)
If its 3"- it should handle additional fixtures- depends on what else is on the line downstream. Also, since you have that trench open- consider replacing the cast iron with plastic. It will add life to your system for not much money.
Another point- you can't use tees in horizontal drainage lines-must be wyes. And don't forget some clean outs.
Proposed venting- your ok if I understood correctly
It is a 2" line- can it still handle 2 additional fixture (2 sinks)?

I took that picture miday through construction so the trench is already covered with concrete. And yes after much more research I understand the reason for using a wyes and PVC underground. Thanks
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