What's the difference between a C5 and C6?

[Ms. Janet]

IMNSHO almost all appraisers really need to read the C ratings a little more carefully. I believe that a C6 would be a residential property that is not habitable, unsafe, and not structurally sound. Essentially a tear down. A C1 with a missing handrail is still a C1 with a requirement for a hand rail.

I just completed a VA Liquidation appraisal. roof is caving in, almost all interior ceilings are caving in, possible mold, no appliances, all carpeting needs to be replaced. however, it is structurally sound, and there are no indications of any issues with plumbing, heating, and electrical. but since all utilities were off, that may prove to not be the case. I gave it a C5 rating, as i understand fannoie Mae's rating system.

A home with the roof caving in and the ceilings caving in is structurally sound and habitable? On what planet?