We did some major repairs to this sunroom that had not been built correctly in the first place.
This sunroom had been built without a vapor barrier underneath. As a result the floor framing rotted out from moisture underneath. While the sunroom required major repairs, we were able to save most of the structure. We built temporary supports for the roof and walls, allowing us to replace the floor system, footers and foundation. And of course a completely sealed vapor barrier was installed to prevent recurrence of the problem.