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My bet is we are talking about the use of an offset toilet flange... (I'm shocked a home inspector found one since it would require pulling a toilet to see)
As long as it is full flow (3") it should not be an issue.. I'm not sure IPC addresses them specifically.
I think UPC may have specific language for them though...
Hmmmmmm gotta go look.
I can't find my UPC
405.4.1 talks about flanges. Offsets are not specifically addressed in the IPC that I can find but would be OK (IMO) if they are properly marked by the manufacturer and installed correctly. Ultimately your local city / state code inspector would be the final say
Wait for Marks take on this though, he knows the codes better than anyone And he is a nice guy that will answer questions for Home Inspectors.
I had not answered yet because I was waiting for clarification of what he meant by offset. I assume he meant the flange but he did not say. As long as the flow is not obstructed, there is no problem with an offset flange. The problem is when non-listed fittings are used as the offset. Until recently there were a whole bunch of non-listed offset because it cost so much to become listed, if you don't sell a lot of them it's harder to justify the expense.
"Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony
Reason for offset flanges: proof that smoking dope and plumbing do not mix. I especially hate coming accross the offset flanges that have a tab for the closet bolt right in the flow. Major trash catchers.