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enter image description hereCan I drain my washing machine into a 4" diameter cast iron stack? I want to take my washing machine out of the basement and reinstall it in kitchen above. I would like to drill into the stack to take 1 1/2" pvc drain pipe. The washer drain is 8 feet from the stack. It's currently using trap, and back up valve.

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  • Are you more worried about how to drill into a cast iron stack, or whether this arrangement would be permissible by your local building regulations? Commented Jan 26, 2015 at 12:55
  • thank you for reply. No just like to know if you think it will work when toilet upstairs is flushed it has two sinks toilet and shower . Old home and mostly cast all other drains are vented into stack above waste I think.Just have no place to run drain otherwise than stack in basement thank you again welcome your advice Don
    – Don 82
    Commented Jan 26, 2015 at 14:20

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I think you are going to have more difficulty drilling into the cast iron stack, than routing a new pipe. Follow the route of the stack down with your 2 1/2 pipe, and then feed it into your waste water system, using the correct fitting

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  • you might have something there. I could run 1 1/2 pvc from washer down to waste pipe Y with proper grade and back up valve pack it with oakum and cement it will need couple more length,s pvc pipe Will upload pix of area to site .Than you for your input Do (have great day)
    – Don 82
    Commented Feb 2, 2015 at 15:26
  • This is pix of upstairs sink (kitchen) will leave for now till washing machine is hooked.There is a Y at end of waste stack to sewer .like you suggested will run pipe into unused section of Y
    – Don 82
    Commented Feb 2, 2015 at 16:34

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