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sewer backs up the kitchen vent stack

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My kitchen sink started to back up and I also get water up the vent stack. a portion of the vent pipe was cut and replaced with PVC. The new section was connected to the remainder galvanized pipe. I think the connection is lower than the kitchen sink drain and the sewer back up gets to that connection first and start to spill over since this is not a pressure connection. Would this be the possible scenario as to why sewer water gets into the vent stack? Thanks much

 

Felix Condurat

 

Illinois
asked in Plumbing by felixcondurat (120 points)
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1 Answer

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Hi Felix, 
What you described is possible but it all depends on the configuration of those drain / vent pipes. The very common kitchen sink drain clog area is at a first (or right below it) 90 (often a “T”) connection inside the wall. That’s where the vent is often attached as well. 
 
Kitchen sink common clog area
 
 
 
If this is how your kitchen plumbing was assembled, waste water will equally rise inside the vent and the sink.
answered by darekrudy (21,730 points)
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