In the process of remodeling a bathroom I pulled up the toilet and old glass mosaic tile floor to find this: View attachment 72809
The waste line is cast iron and is off-center to the flange. It seems that the line was originally plumbed off-center to the toilet niche when the house was built 58 years ago, and someone compensated by somehow installing the flange in the center of the space. This might explain why we’ve occasionally had leakage issues from under the toilet over the years....
Cast iron flange/waste line problem
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