I am looking at a ranch with a metal house. No problem with that as it has gotten more common last few years. Problem is quality construction. The exterior commercial grade metal sheets touch the concrete. In other words the ends are resting on the slab. I have been around farm buildings long enough to know that is not good. Sets up are reaction and rusts out bottom of sheet. I called several national metal suppliers and they agree and say it voids any warranty on their product. A home inspector looked at it and said it was fine, another home inspector said it was fine. It seems most market participants think it is fine. I have experience that tells me it will rust out in 15 years. My job as an appraiser is to tell client what "market value" is. I should only adjust things that the "market" would recognize as an adjustment factor. There are lots of things "I" don't like that the market does and I have to recognize market not me. I can come up with a cost to cure, but the market would not recognize this as a problem. How would you guys handle that.