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Unread 09-13-2007, 06:28 PM   #6
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Join Date: Dec 2004
Location: South Joisey
Posts: 5,217
Since you've got a 4" waste pipe, and toilets function just fine on 3" pipes, using a flange that affixes to the inside of the pipe is not such a bad idea. Remember that the flange should sit on top of the finished (tiled) floor.

And as for positioning the flange, you want the narrow part of the bolt slots (not the bigger square area) to be on either side of the pipe, so that the bolts each wind up at the same distance from the wall. The flanges with the metal rings that can be turned after the flange is installed to align the bolt holes are easiest to use.

And finally, I have been advised by real plumbers (I just play one online) that it is important to put a screw in every flange hole to be sure that the toilet stays put.

Go Rutgers!
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