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Thread: Upstairs Bathroom Addition

  1. #1

    Default Upstairs Bathroom Addition

    I am researching using a Saniflo macerator unit in a second floor bathroom addition.My house is on a slab foundation so there is no easy way to access a large drain line.I have a 2 inch Vent pipe which runs vertical through the outside wall of my first floor kitchen and then thru the attic and out the roof.The vent pipe has a cleanout plug on the outside of the house so I removed the plug and flowed water into the hole and confirmed it will drain.Since the discharge on the macerator is 3/4 inch could I discharge into the 2 inch vent pipe in the attic?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    If there was a blockage, all that s*** would get pumped into your sinks, tubs, toilets, etc. downstairs. If you ran it down and joined the drain down on the first floor, say maybe from a sink, it might work. You'd still need to run a vent for the pump - you could joint into the vent line in the attic, but not with waste.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member construct30's Avatar
    Join Date
    Jun 2007
    NorthWest PA


    You would be turning the vent stack into a wet vent IRC says no wet venting between floors, if I understand you correctly, no for IRC/IPC.

  4. #4


    Thanks for the advice.Could I discharge the saniflo macerator into a washing machine drain.Can you put a "S" trap on the washing machine drain to keep the smell below that level.


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