toilet flange install in concrete floor

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Old 03-10-06, 11:26 AM
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toilet flange install in concrete floor

We are replacing a toilet in a basement. The old toilet was installed with no flange, just sitting on the drainpipe, sealed with a wax ring and held down with two screws. The drain pipe is 4" cast iron and extends above grade unlevel- from 1/4" to almost 3/4" high. What are the steps required to install a flange? Does the exposed drain have to be cut flush first? Is there a flange that will fit over the exposed pipe and sit flush on the floor?
 
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Old 03-10-06, 11:51 AM
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Catherine, Welcome to the DIY Forums.
There are replacement flanges made of PVC that go into the old cast pipe and seal with a rubber "donut". I have included a link which shows one of these. The pipe has to be cut down or a spacer (wood or other material) installed to let the flange sit on a solid surface and be screwed down. Click on the link and go down to the 11th product. You may find these at Home Centers also or a Plumbing Supply shop. Good luck.

http://doityourself.com/shop/closetflanges.htm
 
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Old 03-10-06, 12:57 PM
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cutting cast iron pipe

Thanks for the info. The flange in the link looks like it could work. If it could "cap" over the exposed cast pipe it would be great. If it ends up sitting too high, do do you have any advice on how to shave off a 1/2" or so of the cast iron pipe to lower it to the floor grade? Can it be chipped off or does one need a special saw?
 
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Old 03-10-06, 01:17 PM
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The cast iron pipe CAN be chipped off. This is done by going around the pipe with a chisel and "scoring" the pipe. Then you keep going around it until it breaks off. An angle grinder will also work and give a better cut. Place a rag in the pipe to prevent the pieces from falling down the pipe. It's always good to hook a wire coat hanger on the rag so it doesn't fall too far down the pipe to reach.
The flange pictured seals the pipe with the rubber you see near the bottom of it. The flange still has to be screwed down to the floor so it doesn't have pressure on it when you set the toilet and tighten up the bolts.
 
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