Graph and I checked out a house over the weekend (thanks, IR2!) that had enough cracking to make us wary. We thought it might be slipping down a slope. We talked to Cayci's Dad, the Engineering Geologist, about it last night. He said the cracks to be concerned about are ones coming off of the corners of doorways or other 90 degree angles in a diagonal. He said most cracks parallel to a wall are cosmetic with a certain caveat. He said houses are generally built to withstand about an inch of "settling" or movement of the dirt over time. He then said that when you get up to 2 inches then you start to have structural issues with the house. He also said that the cost to fix could be calculated by measuring the distance, in feet, of the perimeter of the house and multiplying it by $1000. He said "yep, a thousand bucks a foot is about right". Graph likes to use a ball of some sort to see how a floor slopes. We learned that if the downward end of a sloping floor is already an inch lower than the starting point to just stay away. Any more movement and you could be in for a world of hurt. Dad did also say "you could make a lot of money buying houses like that". I said "how?" He said "because you offer the bank a price that is discounted twice the cost of fixing it (see calculation above) and then you can sell it for a profit after you fix it".