cast iron drains

Old 01-07-01, 04:43 PM
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I have just torn out my basement bathroom to re-model. I found I have cast iron drains under the slab for the bath and toilet, and they are rusted and broken below the surface. This is a result of the previous installation. They had put in the shower and toilet by just setting them on top of the drains with a ton of silicone. I am assuming I will have to tear up some concrete. What will be the best and easiest way to switch from cast to PVC? Is there a way I can avoid tearing out the concrete?
Old 01-07-01, 09:06 PM
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Location: Arlington, WA
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You'll have to remove some concrete, but probably not as much as you think. A neoprene coupling (either 3" or 4" for the toilet, depending on the size of the drain pipe there, and a 2" for the shower) will slip right over the cast iron and the ABS can be slid inside it. I would use ABS rather than PVC for the drain parts, simply because of the greater selection of drain parts available in ABS.
Old 01-07-01, 09:31 PM
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Thanks. Are you talking about the rubber coupling with the hose-like clamps on each end? And, if so, can I clamp this directly to the closet flange? Otherwise it will likely be too high.
Old 01-08-01, 06:15 AM
some help
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Yes you can get a flange the same dize as the cast iron couple them to gether so the flange is just on top of the floor...Line the holes up in the flange so they are strait across fill hole with concrete to floor hight under flange ans secure the flange to the concrete....set bolt is place install wax ring and set toilet....

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