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 Why does water back up bypass lower unit and go into higher unit
Author: ssozarks (MO)

We have a problem at a complex that is somewhat frustrating. A clog in a limited common element plumbing stack is below a particular unit. However, that unit did not have water that backed up into it; rather the water backed up into the unit ABOVE the lower condo.

We have checked vents; we are not sure why the water back up from a clog "skips" the second floor unit and then goes into the one above it on the third floor. Any ideas of what to look for? Our plumber says the vents are fine and he is unsure as well. He sent a camera scope down to take a look and confirmed the line blockage was below the second floor unit. But the third unit is the only one affected by water back up into sinks and dishwasher and subsequently onto floor.

I would think the back up water would follow the path of least resistance; however it just rises above the 2nd floor unit and then into the access line for the third floor unit. Any thoughts would be appreciated. If it matters the 2nd floor unit is full time occupied; the third floor is not.

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 Re: Why does water back up bypass lower unit and go into higher unit
Author: bernabeu (SC)

there may be a stack 'revent' connection

y'all will need plans and/or a better plumber and/or open walls for visual


"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

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 Re: Why does water back up bypass lower unit and go into higher unit
Author: hj (AZ)

THere is a stoppage between the second and third floors

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