Symptoms cluster: doors sticking on one side of the house, diagonal cracks from door and window corners, gaps opening at the baseboards, floors that fall away as you cross a room. One symptom alone is weak evidence. Several together, changing over months, is not.

Why St. Louis houses move at all

Two figures explain most of it. The largest soil mapped here is hydrologic group C, the survey’s rating of how readily rain soaks in, and a ten-year storm drops 4.71 inches in a day. Together they decide how long water stays against a foundation wall after a storm. Some movement is ordinary in any house; the question is always whether it has stopped, and two readings months apart answer it.

The reasoning behind that

Start by counting rather than measuring. A single sticking door is a door. A single hairline crack in a garage slab is what concrete does as it cures. Four symptoms in the same quarter of the house is a different finding, and it is the pattern rather than any one item that is worth acting on. The test that actually decides is time. Photograph each crack with something for scale in the frame and date it. Look again in three months. A crack that has been the same width for years and one that opened last spring are indistinguishable in a single photograph and want completely different responses. What settles it properly is an elevation survey, which records relative floor heights across the structure. That converts a list of symptoms into a number, and every conversation after it — with a contractor, an engineer, an insurer or a buyer — starts from that number rather than from a description. Nobody can tell you from a photograph. Any firm willing to is quoting on houses like yours rather than on yours.

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