I've just finished repairing the floor on my X19H (2011).
First order of business is to confirm there is a leak. For this I used a moisture meter designed for checking building material moisture (wood or concrete). It has two little metal probes that stick into the material and measure the electrical resistance. This does leave some tiny "bite" marks in the walls and flooring, so be discrete where you use it - inside cabinets, behind curtains, corners and edges of the floor. Using this I was able to map out where the water was wicking under the vinyl, and follow the wet path up the wall. Since the wet went above the bunk door, I was able to determine that the door was not the culprit. If your source is a leaking toilet flange, then the water footprint will probably point that way, and you won't find any excess moisture in the walls.
Second order of business is to stop the leak. No use repairing if it is just going to keep leaking. In my case, I sealed the back seam of the roof membrane and around the marker lights. I also added a strip of Eternabond over the new caulk on the roof edge (belt and suspenders). I am 90% certain that the leak is gone, but I still monitor with the probe to be sure.
Once the leak was taken care of, I then started work on the floor. In my case I pulled up the vinyl flooring in the affected area, and pulled out all the water damaged plywood. The foam core beneath was very wet as well. Since it was late fall, I decided to leave the floor open for the winter with a few big tubs of damp rid. Come spring, everything seemed pretty dry. Note, in my case (and probably yours based on the description) I was unable to work from below as this is directly over the black tank. I was able to add a bit of additional bracing from below where I could work around the tank, but my fix would have been better if I had better access.
I did make the decision NOT to completely deconstruct the floor; see older posts here from member @scott91370 links here
https://www.jaycoowners.com/forums/f...lly-51661.html for a full off restoration. My work space and time are limited (street in front of my house) and the trailer is already 8 years old; if my repairs last another 8, I'll be happy. I do understand that the bottom layer of the sandwich is still bad wood but the top is sturdy enough, and the area is dry now.
So fixing was relatively simple from that point. I squared up the area that had been damaged and added in fresh subfloor of the same thickness as the prior floor. In my case I had to deconstruct the back inside wall under the bunk and remove the electrical center. Attachment of the subfloor was PL Premium to the aluminum subframe and a few zip screws. I then refloored most of the trailer with a nice vinyl plank flooring. I did raise the sofa, dinette and most of the cabinetry so that I could run the floor beneath.
Happy with the end results. The floor is still a little "soft" in that area but much firmer than it was and the sag in the floor is gone. I'll see how the repair holds up over time. If it fails again quickly I might end up dropping the black tank and tearing out the entire floor, but with no water getting in there, I am fairly confident that it will last for the useful life of the trailer. The entire process took me about 3 weekends 1 in the fall, and 2 in the spring.
A few photos:
Peeling back the floor to expose the mess:
New subfloor. Note that there is new bracing under the stairs so the front foot inside the door is now very firm. The area back around the tool box is a still a little spongy as there was little structure there and the black tank is directly below (toilet is just other side of the wall).
New vinyl flooring. Back cabinets were next to get rebuilt. Needed a bit of adjustment as the floor is slightly thicker. The flooring runs under the kitchen cabinetry to the right.
Flooring runs under the dinette, but I did not remove the fridge or furnace, so those are butt seams. Quarter round to follow.
Flooring ran under the sofa far enough to not have a visible edge:
One other warning. When SWMBO first walked into the trailer after completion she gasped with delight. The next words out of her mouth were "oh now we need to paint, and change all draperies, and the cushions..."
2009 Jayco Jay Feather 17C 130W Solar, 2021 F150 2.7L Eco Boost, 2021 Toyota Highlander
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