I have a dry rotted sub floor, p.s., rear corner. It looks like OSB board, I can spoon it out and it might pass as granola
. It is visible looking through the engine door, below the right side engine door hinge. Has anyone replaced the sub floor back there? Inside, it is the floor of the closet, I can stand on the floor in the closet and feel no softness, but the very corner is boxed in to allow for the hinge and the air intake. From the engine door side, the subfloor sits on the rear most bulkhead frame. The corner edge had been caulked and taped, but tape had lost it's tackiness. And possibly moisture came in that way, or possibly water came through the air intake and found a way to the subfloor.
The simple fix is to cover it with metal flashing and caulk the edge and hope it gets better. To replace it, the board would have to span to the next bulkhead, at the battery compartment. Or I could maybe add an intermediate brace.
There are obvious challenges to sandwiching a panel between the steel frame and the finished floor above.
Has anyone tackled this kind of repair? It is only punky over the frame to the edge of the air intake boot, maybe 5".