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Old 09-22-2011, 08:17 AM   #1
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Relocating washer standpipe


Currently I am building a small addition on my house for a new laundary room and using the existing laundry room for a kitchen expansion. House was built in 1935. I have obtained all permits.

Currently the washing machine empties into a 1 1/2" drain which connects to the kitche sink drain below the trap under the house. The distance from the washer standpipe to where it connects to the kitchen drain is aproximately 4'. When the washer runs you can hear "gurgling" in the kitchen drain. My plan is to move the washer 5' further away into the new room (straight line) and install a utility sink for the washer to drain into. My father thinks we can just extend the washer drain pipe into the new room and connect the sink to it and to vent it thru the roof. My questions:

1) Does this work? Can a utility sink with a 1 1/2" drain connecting to kitchen drain below trap then into main sewer line. Or do we need to run a new 2" drain line connecting to main sewer. We will be putting a new vent in at utility sink.

2) does the gurgling at kitchen sink in current setup indicate that the kitchen sink is not vented? When under the house I do not see a vent setup. The sink is a two bowl model with a dishwasher hooked up. Gurgling also occurs when dishwasher drains.

3) If we connect the new sink to the current washer drain pipe and vent it, will this also help vent the kitchen sink which will be 9' away.

I was thinking of having the plumber inspector visit for an "information" visit but wanted to make sure I had rough idea of what is required before his visit.

I will try to post pictures later. Thanks.

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Old 09-22-2011, 08:34 AM   #2
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Relocating washer standpipe


It used to be legal to drain a washer into a utility sink with a 1-1/2" drain. It is not legal under the current UPC. Washing machine drains must be a minimum 2" diameter.

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Old 09-22-2011, 07:13 PM   #3
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Relocating washer standpipe


Thanks. That is what I figured.
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Old 09-23-2011, 10:23 AM   #4
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Relocating washer standpipe


You're welcome. Even if it was still legal, I certainly wouldn't do it. The washer in my parents' house drained into an adjacent laundry sink. Trust me, it wasn't pretty.
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