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Old 10-15-2012, 09:17 PM   #1
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Where does my cast iron pipe go?


Hi All,

I figured I would get a quicker reply here, so here goes.

I thought this pipe would continue straight for another 6 feet or so, but instead, after a few feet, it 90s straight down. Why would this be?

Townhouse built in 1974
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Old 10-15-2012, 09:50 PM   #2
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Where does my cast iron pipe go?


Straight down to the city waste line.

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Old 10-15-2012, 09:50 PM   #3
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Where does my cast iron pipe go?


Possibly the building drain was laid directly on grade from the city main, and was brought up vertical under the house.

It's not unusual to have a deep pipe with a riser coming straight up off of it.


Is this causing you some kind of problem ?
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Old 10-16-2012, 08:22 AM   #4
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Where does my cast iron pipe go?


No, no problem, just wasn't expecting it to go straight down. Since I am re-doing the plumbing for the full bath in that area, would it be OK to remove the cast iron pipe from one end of the elbow and replace with PVC? Or should I cut the cast iron pipe a foot or so away from the elbow and connect with a gasket? Which is the proper way since I'm not digging down any further?
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Old 10-16-2012, 09:43 AM   #5
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Where does my cast iron pipe go?


It wouldn't be a bad idea to eliminate the old fitting before covering it up with concrete again. Make sure the outside of the pipe is clean and smooth so you can connect it with a shielded no-hub coupling.
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Old 10-16-2012, 10:28 AM   #6
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Where does my cast iron pipe go?


Thanks Alan,

So dig down more, expose the pipe coming up, remove the cast elbow and replace both the elbow and pipe before covering with concrete?

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