Subfloor damage in the bathroom usually comes from a leaking toilet but it can also be the result of a persistent sink drain leak or even a drip behind.
How to repair rotted bathroom floor.
Other clues about the floor damage included discolored flooring mold along the wall and lots of opportunity for water leaks with washer toilet and water heater.
Around the toilet the floor may get flooded from overflowing.
How to replace a rotten floor in front of a bathtub.
If only the area directly below the flange is rotted you can install a two piece steel closet flange support.
You may not think of your floor as vulnerable but in the bathroom it is.
Rotted bathroom floor sure it will take you some work but the end result is well worth the effort.
This video shows technique on removing a rotten bathroom floor and replacing it with advantec subfloor and finally new vinyl in this case or your flooring o.
Stepping through the floor was not the first hint that it had rotted out but it sure moved the floor repair up on the priority list for a house with plenty of remodel projects to do.
How to repair a rotted bathroom subfloor.