Connecting a sink drain into washers stand pipe

Old 12-27-22, 05:37 PM
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Connecting a sink drain into washers stand pipe

Hi. I want to add a sink in a room separated by a concrete wall from laundry room. The vent pipe is buried inside the wall so the only option is to connect the sink drain into washers stand pipe. I've read that it's doable as long as the stand pipe is 30" high from the p trap and the sink drain is 30". The only thing is that I wouldn't get 30" from the stand pipe to the sink, and I dont want to drill through the concrete wall diagonally to get the proper pipe lenght so my option is to add an elbow and curve the drain pipe to achieve 30". Washer and Sink (no p-trap) -> Sanitary Tee -> Stand Pipe (p-trap) -> Vent Is this an option? Is it fine to have the sink drain line curved/bent to make it longer? Should the pipe from the sink to the stand pipe be under a slight decline angle? Would this configuration be fine or is there a risk that the washer washer comes out the sink? Something like this. Sorry for making it so messy This one's a bit better, but the vent pipe is inside concrete wall. The line circled in yellow would be curved. PS. Im in Florida Thank you!
Old 12-27-22, 05:55 PM
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The only way to do it is with a double fixture tee above your bottom plate, with the washer and trap on one side, sink with its trap on the opposite side.

You cannot do it legally the way you have it drawn.

The only other option is to eliminate the washer stand pipe and put the washer hose right into your sink. Which is not a good option since it's not in the same room and even if it was, it's not usually the preferred way to do it unless it's a janitors sink.

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