My wife and I have a home built in 1912. We love the house and its character, but sometimes it presents a challenge to the way modernity was retrofitted. In this case, I have a bathroom with a wood floor. Usually this is no problem - the shower is mounted on a clawfoot tub and it has curtains to contain the spray. Incidental water gets on the floor, but that's really no problem.
The problem is when the toilet overflows. When that happens, the flood of water seeps through the floor and through the ceiling of the room below and causes water damage in the ceiling as well as making a mess. Is there a way to seal this wood floor so that water can't get through, while still preserving the character of the floor (i.e., not just covering it in vinyl)?