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Question DetailsAsked on 5/18/2016

if a vent pipe is blocked would it have the same effect if there was not enough vent pipes?

It appears that the water in 2 of my 3 toilets that are close in location will occasional drain the water to the bottom of the bowl. Sometimes with will happen after the toilet or toilets have been flushed, dishwasher, kitchen sink or washer have been running or ran. For the most part once the water has drained low the toilets do not flush, they will fill full of water and eventually drain back down. So I am trying to figure out if this is a vent problem or not. I must say that this has happened before but not to the extreme. It is the master bath and the hall bath that have a joining wall that are having this problem. I have ran a hose down the vent pipe coming out of the roof and it backed up into the master shower. just not sure what to do.

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This is Brendon M. in Member Care.

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Answered 3 years ago by Member Services


Since has not happened consistently since you moved into the house, not an issue with inadequate venting or it would ALWAYS happen.

Running the hose down the vent pipe caused a backup into shower - this means you definitely have a blockage somewhere in the system. Can't say for sure where not knowing your venting arrangement (done numerous different ways) so could be a vent or drain issue.

Because it pulls the water level down in the toilets when other fixtures like sink and washer run, but you don't say anything about any backups in any fixture (except when running water into the vent) certainly sounds like a vent blockage. Quite likely a head-end vent arrangement, where instead of individual venting at each fixture they just connected the vent pipe to the "upstream" end of the drain piping. If done on an extension of a near horizontal run can get blocked up with backflowing solids pretty easily. I would suspect if you had run a snake down the vent pipe first, then run the hose, it might have cleared out.

Probably has a mass of packed toilet paper blocking it - I would get a Sewer and Drain Cleaning contractor to come out to clean it out. And if your drain pipes/sewer line has not been cleaned out in the last 10 or more years, might be an idea to bite the bullet and have him doa full-diameter cleaning of the full DWV stack and sewer line all the way out to the street/septic tank (as applicable) to restore your pipoes to the full diameter by scraping out the built-up grease, fibers, and soap scum that builds up over the years.

Answered 3 years ago by LCD

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