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Old 06-16-2016, 02:57 AM   #1
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Replacing Cast Iron With ABS


Thinking about replacing (or having replaced) the old main cast iron stack on the right. The piece you see the bottom of as it enters the black elbow is a 45 degree Y with a leaded toilet flange coming in the top and the rest of the stack coming in at an angle from the wall over the foundation. The cast iron is from the 60s or earlier.



What is the right way to make this connection? Can the bottom of the Y or elbow be cut with a chain cutter or sawzall and a shielded coupling attached to ABS or PVC? Or does one need to drill and chisel out the old lead and oakum and use a donut connection where the pipe sections join?

What cutting and connection method is least likely to crush or damage the existing cast iron we're connecting to? (Don't want to replace the drainpipe through the foundation or crawlspace or yard or neighbor's yard, etc... if possible).

Last edited by Tom738; 06-16-2016 at 03:00 AM.
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Old 06-16-2016, 08:46 AM   #2
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Re: Replacing Cast Iron With ABS


Why are you wanting to replace any of this? In the photo I do not see any cracks or broken pieces. Cast iron piping is one of those things that fall under the old "IF it ain't broke, don't fix it".
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Old 06-16-2016, 10:46 AM   #3
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Re: Replacing Cast Iron With ABS


That little area looks like a lot of grief.
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Old 06-16-2016, 11:09 AM   #4
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Re: Replacing Cast Iron With ABS


If you accidentally crack a fitting it might get ugly. I have used the sazall blades for cast iron and they work pretty good.
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Old 06-16-2016, 12:19 PM   #5
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Re: Replacing Cast Iron With ABS


Quote:
Originally Posted by Thurman View Post
Why are you wanting to replace any of this? In the photo I do not see any cracks or broken pieces. Cast iron piping is one of those things that fall under the old "IF it ain't broke, don't fix it".
Three reasons that make it seem appropriate: (1) toilet above was from the 50s on lead flange with 14 inch rough, and are looking to replace with modern toilet with 12 inch rough; (2) wall and ceiling are open upstairs so it's a relatively convenient time to re-do in-house cast iron rather than have it go whenever is least convenient; (3) upstairs cast iron looks a bit rusty, although not too insane.
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