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Old 01-27-2012, 09:46 PM   #1
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cast iron to ABS? (or pvc)


ok,so here is my project: I'm putting in a "half bath" downstairs and of course need a drain for the toilet. so,the plan is to open the concrete floor and put a "Y" into the drain pipe. only thing is,that drain pipe that goes under the concrete is cast iron. (a plumber told me that right about when this house was built in '79, builders went from cast iron to pvc in the concrete, mine must have been one of the last houses built with cast iron pipe) there shouldn't be a problem cutting the pipe (my recip. saw cuts everything!) but I imagine that the "Y" has to be cast iron,right? how do you attach it? glue? NAH! and will the pipe have to be cast iron all the way to the flange? (probably 4-5 feet)

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Old 01-27-2012, 09:54 PM   #2
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cast iron to ABS? (or pvc)


You can cut the cast with a carbide coated sazall blade and use a fernco connector. The fernco will be either a 4" cast to plastic or a 3" cast to plastic. Attach the fernco to the cast and run plastic the rest of the way. The pipe in the picture looks like 3" ABS and if the cast under slab is 4" get a 4" cast to plastic fernco. Then get a 4x3 pvc bushing and install the bushing in the fernco plastic side then run 3" from there

Also, find the carbide blades because a regular metal cutting blade won't do it. If you have a plumbing friend that has a snap cutter for pipe use that.

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Old 01-27-2012, 10:59 PM   #3
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cast iron to ABS? (or pvc)


PVC is ok for the tap, I recommend that you use no hub couplings and no hub adapters for the mating,
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Old 01-28-2012, 12:36 AM   #4
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cast iron to ABS? (or pvc)


Depends on how your inspectors are and your local codes.
I cant imagine them having any problem with you using a cast iron wye and no hub coupling and a wye,once it leaves the wye you can run the branch line in pvc
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Old 01-28-2012, 10:16 PM   #5
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Depends on how your inspectors are and your local codes.
I cant imagine them having any problem with you using a cast iron wye and no hub coupling and a wye,once it leaves the wye you can run the branch line in pvc
so, I guess we've come "full circle" back to my original question about how one would attach a cast iron "Y". hot lead? does anyone do that anymore? (I saw a plumber do that years and years ago to the cast iron sewer pipe in my parent's house) do plumbers just use "clamp on" type couplings nowadays?

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Old 01-28-2012, 10:21 PM   #6
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I haven't come across any code that doesn't allow for PVC. Why in the world would you want to bury a metal fitting or pipe? If you follow what I suggested it will pass code and you will be fine.

Pouring lead has almost become a thing of the past. With all the advances in plumbing cast is a thing of the past in residential plumbing.

Also, keep in mind that over years the waste will deterorate the inside of cast and can cause areas to catch debri and it flows out where as PVC doesn't.
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Old 01-28-2012, 11:03 PM   #7
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cast iron to ABS? (or pvc)


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I haven't come across any code that doesn't allow for PVC. Why in the world would you want to bury a metal fitting or pipe? If you follow what I suggested it will pass code and you will be fine.

Pouring lead has almost become a thing of the past. With all the advances in plumbing cast is a thing of the past in residential plumbing.

Also, keep in mind that over years the waste will deterorate the inside of cast and can cause areas to catch debri and it flows out where as PVC doesn't.
I guess it's just my dumb old curiosity but I'm wondering...if you look at the pic, how was the lower piece of "cast" attached to the wide "joint" going into the concrete? could that be lead or some other "stuff"? just wondering...

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Old 01-28-2012, 11:16 PM   #8
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The hub above concrete has a rubber do-nut to attach ABS, going through the concrete it either goes straight down to a bend or bends as it goes through the concrete. I assume is is lead at the next hub.
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Old 01-29-2012, 08:04 AM   #9
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Itís very simple get your pvc wye get 2 no hub adapters 2 no hub couplings, glue the 2 no hub adapters to the wye measure it, then cut the cast iron so that the new pvc section fits with about an 1/8Ē clearance on each end. Clamp it in place with the no hub couplings do use fernco in this situation, youíre asking for problems by using ferncos . you can now continue in PVC. this is a code approved tap.

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Old 01-29-2012, 09:57 AM   #10
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so, I guess we've come "full circle" back to my original question about how one would attach a cast iron "Y". hot lead? does anyone do that anymore? (I saw a plumber do that years and years ago to the cast iron sewer pipe in my parent's house) do plumbers just use "clamp on" type couplings nowadays?

tnx,
No hub couplings would be my choice,although i still pour a lead joint once in a while
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Old 01-29-2012, 01:35 PM   #11
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Just an old retired hack from nebraska with 30 years and several diffferant master plumbers licenses ,a master electricians license and an electrical contractors license who apparently knows nothing

don't be so hard on yoursef "plummen"! just remember,as an old "sage" once said:
"noone is totally useless,he can always be used as a bad example"
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Old 01-29-2012, 04:49 PM   #12
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Oh dont worry no doubt in my mind that I can wire/plumb and dig holes as well anybody,just not as fast anymore is all!
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Old 01-29-2012, 05:12 PM   #13
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cast iron to ABS? (or pvc)


use a pvc wye same size as cast then you can reduce new branch to 3" if wanted to save cost the wye will be attached to cast with disimbler bands they are the ones with the smooth stainless shield cast can be cut with sawzall blade for cast, or grinder, or rent a cast snapper which is best option
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Old 01-29-2012, 05:18 PM   #14
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use a pvc wye same size as cast then you can reduce new branch to 3" if wanted to save cost the wye will be attached to cast with disimbler bands they are the ones with the smooth stainless shield cast can be cut with sawzall blade for cast, or grinder, or rent a cast snapper which is best option
Is that legal in your area to mix/match materials before a branch line?
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Old 01-29-2012, 05:38 PM   #15
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cast iron to ABS? (or pvc)


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Is that legal in your area to mix/match materials before a branch line?
I can install a wye of any approved material as long as the proper transition couplings are used.
If I'm following this thread correctly, I'd cut an ABS wye into the bldg. drain and connect it using a PLxCI no-hub. Then run ABS to the existing ABS stack.

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