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Old 09-05-2008, 06:38 PM   #1
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cast iron flange

Trying to track down a leak from our bathroom, I ended up removing the toilet and surrounding floor down to the floor rafters. Discovered a pretty rusted and messed up iron flange apparently screwed on to the 4 inch waste pipe. All replacement pvc flange packages including the "Super Flange" brand said to first remove the old flange. Rigged a device to try to unscrew the rusted flange but couldnt budge it. Right now the old flange is abt 1/2 inch above the floor level.
First, what's the trick to unscrewing the old flange and, second, if I cant get it off, will the addition of a super flange on top create too much height for the toilet? Cant really raise the sub floor either. Appreciate your suggestions.


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Old 09-05-2008, 09:45 PM   #2
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Good luck unscrewing the old flange. You'd be one of the few I'd ever know to be able to do such.

I've used a 4" angle grinder with a metal cutting wheel before to cut the old flange off. Might consider that. Don't forget safety glasses and a good dust mask.


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Old 09-06-2008, 12:45 PM   #3
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Most cast iron flanges are held on with lead that has been melted and poured into the space between the flange and the pipe. The Super Flanges I have seen are installed over the existing flange (even broken ones) and screwed to the floor. Only about 1/16 to 1/8" thick.
If you have never made a mistake, you haven't done much.
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