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Old 08-14-2016, 09:54 AM   #16
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Re: Draining laundry sink into washer stack with trap in slab


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Originally Posted by pkcinna View Post
Right. I already have the p-trap installed since it came with the sink kit. I'm a plumbing novice and my first impression was a p-trap is not needed since I read it is used to prevent gases from coming out the drain and this case the laundry room open vent stack already lets air into the room.
You said in your first post the laundry stand pipe had a trap under the floor. That keeps the sewer gases from the stand pipe. If you do not have a trap on the stand pipe you have issues to deal with.
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Old 08-14-2016, 10:41 AM   #17
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Re: Draining laundry sink into washer stack with trap in slab


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If you are going to take that route, i would still strongly suggest that you install a P-trap under the sink.
Two traps are a no-no. He is fine feeding the stand-pipe with a straight 1 1/2" trap arm.

The whole apparatus won't be code compliant, but it will be functional and safe. This is one of those situations where close enough suffices.
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Old 08-16-2016, 03:59 PM   #18
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Re: Draining laundry sink into washer stack with trap in slab


Thanks everyone! After two days of plumbing and drywall repair all seems to be working. Attached are pictures of plumbing and final result. It turned out to be more difficult since I had to get a reciprocating saw and cast iron cutting blade to lower the main pipe a few inches.
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Draining laundry sink into washer stack with trap in slab-sink-drain.jpg   Draining laundry sink into washer stack with trap in slab-sink-final.jpg  
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Old 08-17-2016, 07:25 AM   #19
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Re: Draining laundry sink into washer stack with trap in slab


Looks great! Congrats!

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Old 08-17-2016, 05:26 PM   #20
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Re: Draining laundry sink into washer stack with trap in slab


That should pull the trap on that utility tub real well....
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