Standing Drain or "Standpipe" Pressure issue?

Discussion in 'General Plumbing Help' started by JayCee23, Jul 9, 2019.

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  1. Jul 9, 2019 #1

    JayCee23

    JayCee23

    JayCee23

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    Location:
    Chicago, IL
    Hello,

    My block was recently pummeled by 3.5" of rain in less than two hours.
    There is a 45" standpipe in the only floor drain in the basement.
    My neighbors had sewage backup, i did not because of the standpipe.
    I might have gotten it worse - it seems as though a crack in the floor started gushing water and i got 2" of water in the entire basement.
    Can that tall of a standpipe cause the pipes to burst or do you think it was just the saturated ground causing the hydrostatic pressure to penetrate the slab?

    Thanks!
     
  2. Jul 9, 2019 #2

    bbp

    bbp

    bbp

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    Depending on the age of the house and your location either hydrostatic or seepage from the cast/clay piping under the floor.I worked for 25 years in the western suburbs and near west side, lots of old groundwork but never saw a " burst" from back pressure with a standpipe.
    Was it clear water or smelly as in sewage water?
     
  3. Jul 9, 2019 #3

    JayCee23

    JayCee23

    JayCee23

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    House was built in 1940 and when the sewer main scoped 3 months back, it was clean as a whistle. But i think i do remember seeing a section that was "offset" a bit. Maybe it did have a bad joint.
    The water was crystal clear, no sewage present.
    Its hard to find this standpipe height topic online - some professional websites state not to use a standpipe over 24" due to pressure build up and possibility of foundation walls/floors cracking or even collapsing, while others say that this type of claim is "unfounded".

    Thanks for the response BBP
     

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