WeQ have a 50 yo year old house. Found plumbing has been leaking behind walls. Plenty of mold and rotted wood. We are taking up tile and concrete off the floor so that we can remove bathtub. ( Tri level house -we are on the top floor) We need to make sure the wood holding the cast iron tub is not rotted as well and find all the water damage. We started chipping out the tile and concrete only to find what used to be a wood subfloor. Its like old paper now. Scary when you are on the second floor. So moved closer to the door thought we would start there. The concrete there is completely soaked and the wood at bottom of framing in the corner is rotted. Unsure how to stay on the second floor while we remove the tile and concrete. Any safety hints?