My house is 28 years old. It has 5 toilets. The 3" black, plastic drainage pipes are in a slab with a steel flange popping out of the slab. They all have the same problem:
The original builder used toilets that had a deeper than normal recess in the area that matches with the the toilet flange. (Or maybe they figured on putting extra thick tiles on the pad in the bathroom.) Therefore, all toilet flanges stick out 1/2" above the concrete pad. This makes it impossible to replace the toilet with standard toilets because the new toilets would sit directly on the flange, leaving a 1/2" space between the bottom of the toilet and the slab. IOW, the flange is too high. Result: the toilet wobbles.
When a previous owner replaced a toilet, he inserted a 1/2 sheet of plywood under the toilet in order to raise the toilet. It now leaks and looks like hell.
How can I resolve this problem. Of course, I could jackhammer the pad, cut out out the old, glued-in flange, and glue in a new, shorter flange.
With 5 toilets, that would be a major undertaking
Can someone think of a simpler solution?