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Old 01-25-2010, 09:32 PM   #1
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Cast Iron Pipe Surgery

I'm trying to put in a laundry sink. I've got some work that I need to do on the copper pipes going into the slab and I finally was able to adapt my lines in order to get a sink connection to fit.

I did, however, forget all about the drain for the sink. Currently, my washer drains into a aprx. 3 ft cast iron pipe. I need to lower the height of said pipe, but I keep hearing that cast iron can be tricky as it is more likely to shatter than cut smooth.

Anyone got an ideas for how I can "lower" this pipe for my sink drain and connect it to the sink? I think that the drain pipe is 2".


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Old 01-26-2010, 12:58 PM   #2
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a picture


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Old 01-26-2010, 01:13 PM   #3
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Yes, a picture would be most helpful. It sounds as if you have a CI pipe which is about 3' high from the floor level and your washer drains into that. If so: Then you are wanting to add the drain from your sink into the CI pipe. YES, cast iron sometimes does want to "shatter" or "split" lengthwise when trying to cut it. This only happens when you are in some gosh-aweful position and only have one shot at doing the work. Ask me how I know! How to cut the pipe depends on how much room you have to work with. Of course a "soil pipe cutter" would be the best way, but who owns one of these nowadays? I have a blade for my SawZall that has carbide granules on it that cuts CI rather easily, I know everyone does not. I have cut CI by using a cold chisel and making indentations all around the pipe, if you can get all around the pipe, until I knew I have enough and then PRAY and strike the CI just right. Now, if you can get a clean cut on the CI pipe there are flexible fittings to connect this CI back together and add another line into the side of the fitting for your drain. Good Luck, David
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Old 01-26-2010, 08:36 PM   #4
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When you get the pipe cut down you should go to abs, insert a y and extend the new pipe back up to the same 3' as the original. The height is providing an airgap so your washing machine doesn't siphon out. The "Y" will be for your sink connection after going through a trap.
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Old 01-27-2010, 12:26 AM   #5
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is this a stand pipe coming from floor your trying to tie into?
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Old 01-27-2010, 12:28 AM   #6
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Re: Hope it's not too late!

I have torn out 10 or so stacks in the last few years. Only one cut matters, the one at the bottom where the new connection goes. I would Never use a snap cutter when trying to get a good, smooth, clean cut. I have had a lot of success with a Milwaukee "Torch" metal blade. Get the longer version of it and you'll have the best chance at success. I have yet to have a piece of 3 or 4" CI bust or shatter when making a cut with this blade. I have tried blades made for cast iron with no success. Best of luck.


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