Gap between 2nd story subfloor and toilet flange

[Alex U.]

Hello BPers,

During demo, we removed a 2nd story toilet on a wooden subfloor ( 1980s home).  I noticed a 1 inch gap all the way around the toilet flange and the wooden subfloor.  If someone were to drop water on the tile in the bathroom it could flow between this gap and down to the 1st floor.  Is it normal to have this gap, that basically lets you see down to the ceilig drywall of floor 1?