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Bob-Tman31
Waste Stack - Is this going to be easy to take apart?

Hi all,
Got an issue with the waste stack drain pipe. In the picture you can see a tee connection where the sink in the powder room meets the main waste pipe.
It was just discovered that any waste water upstream coming down the waste stack has been back flowing into the powder room drain pipe depositing debree in the sink's drain pipe which then plugs up the sink. So the solution is to change out the tee for a wye.
Is that going to be easy?

See picture - Today the rubber hub coupling was slid down to expose what was under neath it. It seems as though the tee is just resting on the PCV pipe.
What about the tee itself, does that screw into the wye above it or do those pieces just sit on top of one another?
The plan was to detach the drain pipe and then remove the tee by moving it up and out, am I on the right track?
Thanks in advance,

Re: Waste Stack - Is this going to be easy to take apart?

Hi Bob,
First of all there is nothing wrong with having a tee fitting there and you would be hard pressed to fit a wye on the stack because the wall is so close. Also whenever your working with old cast iron, the term "easy" doesn't really apply :)
If waste water is backing up into the sinks branch, there is likely a problem downstream; such as a partial blockage, that may be easily repaired with a drain auger.

MLBSF
Re: Waste Stack - Is this going to be easy to take apart?
Quote:

"If waste water is backing up into the sinks branch, there is likely a problem downstream; such as a partial blockage, that may be easily repaired with a drain auger."

his answer makes the most sense to me but you have a bigger issue there. it's illegal to install cast iron up stream of pvc. it's fine to install pvc up stream of cast iron. who ever updated your current waste piping and installed the PVC below the cast iron should be brought back in to fix the job. pvc can not support the weight of cast iron and the rubber coupling that he used is not the right type either. it's supposed to have 2-3 steel hose clamps on the top and bottom of each pipe wrapped around metal wrapped around the rubber coupling.

Bob-Tman31
Re: Waste Stack - Is this going to be easy to take apart?

Thanks guys for the reply,

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