We repaired this rotted floor in a house in Fort Worth. Water head started leaking under the toilet where a previous contractor had added flooring without removing the toilet.
The toilet not being removed when the new floor was installed acted like a dam and caused the leaking water to run between the original floor and the newer subfloor without anyone knowing anything about it until the floor started buckling!
We removed the toilet, cleaned out everything that was rotted or damp, sprayed it down with stain blocker primer (in this case Kilz), then built the floor back up level.
The end result was as if it had never happened! It’s good to really watch the people you hire to make sure they are properly doing their job, do some research and look to see if they’re following industry standards…